November 2010 - Devel - libvirt List Archives

[libvirt] First Virsh command Reference Pages online
by Justin Clift 13 Nov '10

13 Nov '10

Hi all, Started work on a Virsh "Command Reference" a few days ago, as a way to "Officially Document" (!) the many virsh commands. My plan is to add to the commands here as I work on related sections. So, as I'm working on "Virtual Networking" at the moment, it's the net-* commands that have been added. This is a first go, and it's on the wiki: http://wiki.libvirt.org/page/VirshCmdRef The net-* commands there should all be accurate at this point: http://wiki.libvirt.org/page/VirshCmdNetAutostart http://wiki.libvirt.org/page/VirshCmdNetCreate http://wiki.libvirt.org/page/VirshCmdNetDefine http://wiki.libvirt.org/page/VirshCmdNetDestroy http://wiki.libvirt.org/page/VirshCmdNetDumpXML http://wiki.libvirt.org/page/VirshCmdNetEdit http://wiki.libvirt.org/page/VirshCmdNetList http://wiki.libvirt.org/page/VirshCmdNetName http://wiki.libvirt.org/page/VirshCmdNetStart http://wiki.libvirt.org/page/VirshCmdNetUndefine http://wiki.libvirt.org/page/VirshCmdNetUUID Does anyone have time to look over them, and make sure there aren't any obvious mistakes? If things are ok, I'll convert them to standard HTML tomorrow and move them to the main libvirt docs. Regards and best wishes, Justin Clift

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[libvirt] [PATCH] docs: updated virsh command reference with libvirt.org links
by Justin Clift 13 Nov '10

13 Nov '10

--- docs/virshcmdref.html.in | 20 ++++++++++---------- 1 files changed, 10 insertions(+), 10 deletions(-) diff --git a/docs/virshcmdref.html.in b/docs/virshcmdref.html.in index a5a7554..0a19ca7 100644 --- a/docs/virshcmdref.html.in +++ b/docs/virshcmdref.html.in @@ -31,10 +31,10 @@ <ul> <li> - <a href="http://justinclift.fedorapeople.org/virshcmdref/html/">Standard HTML format, multiple pages</a> + <a href="http://libvirt.org/sources/virshcmdref/html/">Standard HTML format, multiple pages</a> </li> <li> - <a href="http://justinclift.fedorapeople.org/virshcmdref/html-single/">HTML format, one long page</a> + <a href="http://libvirt.org/sources/virshcmdref/html-single/">HTML format, one long page</a> </li> </ul> @@ -49,21 +49,21 @@ <ul> <li> Standard HTML format, multiple pages - (<a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">.tar.gz</a>) - (<a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">.tar.bz2</a>) - (<a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">.zip</a>) + (<a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0-html…">.tar.gz</a>) + (<a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0-html…">.tar.bz2</a>) + (<a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0-html…">.zip</a>) </li> <li> HTML format, one long page - (<a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">.tar.gz</a>) - (<a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">.tar.bz2</a>) - (<a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">.zip</a>) + (<a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0-html…">.tar.gz</a>) + (<a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0-html…">.tar.bz2</a>) + (<a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0-html…">.zip</a>) </li> <li> - <a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">PDF format</a> + <a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0.pdf">PDF format</a> </li> <li> - <a href="http://justinclift.fedorapeople.org/virshcmdref/Virsh_Command_Reference-0.8…">ePub format</a> + <a href="http://libvirt.org/sources/virshcmdref/Virsh_Command_Reference-0.8.6-0.epub">ePub format</a> </li> </ul> -- 1.7.3

1 1

[libvirt] [PATCH] virsh: add command net-info
by Osier Yang 13 Nov '10

13 Nov '10

To list basic information about the network. * tools/virsh.c --- tools/virsh.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 59 insertions(+), 0 deletions(-) diff --git a/tools/virsh.c b/tools/virsh.c index e704799..54643f2 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -4088,6 +4088,64 @@ cmdNetworkUuid(vshControl *ctl, const vshCmd *cmd) return TRUE; } +/* + * "net-info" command + */ +static const vshCmdInfo info_network_info[] = { + {"help", N_("network information")}, + {"desc", "Returns basic information about the network"}, + {NULL, NULL} +}; + +static const vshCmdOptDef opts_network_info[] = { + {"network", VSH_OT_DATA, VSH_OFLAG_REQ, N_("network name")}, + {NULL, 0, 0, NULL} +}; + +static int +cmdNetworkInfo(vshControl *ctl, const vshCmd *cmd) +{ + virNetworkPtr network; + char uuid[VIR_UUID_STRING_BUFLEN]; + int autostart; + int persistent = -1; + int active = -1; + char *bridge = NULL; + + if (!vshConnectionUsability(ctl, ctl->conn)) + return FALSE; + + if (!(network = vshCommandOptNetworkBy(ctl, cmd, NULL, + VSH_BYNAME))) + return FALSE; + + vshPrint(ctl, "%-15s %s\n", _("Name"), virNetworkGetName(network)); + + if (virNetworkGetUUIDString(network, uuid) == 0) + vshPrint(ctl, "%-15s %s\n", _("UUID"), uuid); + + active = virNetworkIsActive(network); + if (active >= 0) + vshPrint(ctl, "%-15s %s\n", _("Active:"), active? _("yes") : _("no")); + + persistent = virNetworkIsPersistent(network); + if (persistent < 0) + vshPrint(ctl, "%-15s %s\n", _("Persistent:"), _("unknown")); + else + vshPrint(ctl, "%-15s %s\n", _("Persistent:"), persistent ? _("yes") : _("no")); + + if (virNetworkGetAutostart(network, &autostart) < 0) + vshPrint(ctl, "%-15s %s\n", _("Autostart:"), _("no autostart")); + else + vshPrint(ctl, "%-15s %s\n", _("Autostart:"), autostart ? _("yes") : _("no")); + + bridge = virNetworkGetBridgeName(network); + if (bridge) + vshPrint(ctl, "%-15s %s\n", _("Bridge:"), bridge); + + virNetworkFree(network); + return TRUE; +} /**************************************************************************/ /* @@ -9924,6 +9982,7 @@ static const vshCmdDef commands[] = { {"net-start", cmdNetworkStart, opts_network_start, info_network_start}, {"net-undefine", cmdNetworkUndefine, opts_network_undefine, info_network_undefine}, {"net-uuid", cmdNetworkUuid, opts_network_uuid, info_network_uuid}, + {"net-info", cmdNetworkInfo, opts_network_info, info_network_info}, {"iface-list", cmdInterfaceList, opts_interface_list, info_interface_list}, {"iface-name", cmdInterfaceName, opts_interface_name, info_interface_name}, -- 1.7.2.3

2 3

[libvirt] boostrap: gzip version check problem on FreeBSD
by Matthias Bolte 13 Nov '10

13 Nov '10

boostrap.conf lists gzip as build dependency. bootstrap then tries to get it's version number using a get_version() function that executes 'gzio --version' and tries to parse the result. The sed expression expects the version number to contain a dot as gzip outputs it on Linux: $ gzip --version gzip 1.3.12 But on FreeBSD it outputs this: # gzip --version FreeBSD gzip 20100407 Therefore, the sed expression should be relaxed, or bootstrap should not try to parse the version number when it doesn't need it because gzip is listed with '-' as version requirement. Matthias

4 4

[libvirt] [PATCH] qemu: fix typos in qemu_monitor_text.c
by Osier Yang 13 Nov '10

13 Nov '10

* src/qemu/qemu_monitor_text.c (qemuMonitorTextChangeMedia) --- src/qemu/qemu_monitor_text.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c index 2552111..64ec57b 100644 --- a/src/qemu/qemu_monitor_text.c +++ b/src/qemu/qemu_monitor_text.c @@ -906,7 +906,7 @@ int qemuMonitorTextChangeMedia(qemuMonitorPtr mon, if (qemuMonitorCommand(mon, cmd, &reply) < 0) { qemuReportError(VIR_ERR_OPERATION_FAILED, - _("could not eject media on %s"), devname); + _("could not change media on %s"), devname); goto cleanup; } @@ -915,7 +915,7 @@ int qemuMonitorTextChangeMedia(qemuMonitorPtr mon, * No message is printed on success it seems */ if (strstr(reply, "device ")) { qemuReportError(VIR_ERR_OPERATION_FAILED, - _("could not eject media on %s: %s"), devname, reply); + _("could not change media on %s: %s"), devname, reply); goto cleanup; } -- 1.7.3.2

1 1

[libvirt] [PATCH] configure: Remove bashism and replace 'test ==' with 'test ='
by Matthias Bolte 12 Nov '10

12 Nov '10

This also fixes configure problems on FreeBSD, as test doesn't understand '==' there. --- configure.ac | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/configure.ac b/configure.ac index f691c27..66237e1 100644 --- a/configure.ac +++ b/configure.ac @@ -269,9 +269,9 @@ fi AC_MSG_CHECKING([where to write libvirtd PID file]) AC_ARG_WITH([remote-pid-file], [AC_HELP_STRING([--with-remote-pid-file=@<:@pidfile|none@:>@], [PID file for libvirtd])]) -if test "x$with_remote_pid_file" == "x" ; then +if test "x$with_remote_pid_file" = "x" ; then REMOTE_PID_FILE="$localstatedir/run/libvirtd.pid" -elif test "x$with_remote_pid_file" == "xnone" ; then +elif test "x$with_remote_pid_file" = "xnone" ; then REMOTE_PID_FILE="" else REMOTE_PID_FILE="$with_remote_pid_file" @@ -1776,7 +1776,7 @@ if test "$with_python" != "no" ; then fi fi - if test "$with_python" == "yes" ; then + if test "$with_python" = "yes" ; then AM_PATH_PYTHON(,, [:]) if test "$PYTHON" != : ; then -- 1.7.0.4

2 3

[libvirt] [PATCH] virsh: Fix compile error in VPATH build
by Matthias Bolte 12 Nov '10

12 Nov '10

tools/console.c depends on daemon/event.h. --- tools/Makefile.am | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/tools/Makefile.am b/tools/Makefile.am index b686045..921d621 100644 --- a/tools/Makefile.am +++ b/tools/Makefile.am @@ -54,6 +54,7 @@ virsh_CFLAGS = \ -I../include -I$(top_srcdir)/include \ -I$(top_srcdir)/src \ -I$(top_srcdir)/src/util \ + -I$(top_srcdir) \ -DGETTEXT_PACKAGE=\"$(PACKAGE)\" \ -DLOCALEBASEDIR=\""$(datadir)/locale"\" \ $(WARN_CFLAGS) \ -- 1.7.0.4

2 2

[libvirt] [PATCH] Generate HACKING from docs/hacking.html.in
by Matthias Bolte 12 Nov '10

12 Nov '10

Tweak pre tags in docs/hacking.html.in to achieve proper indentation of their plaintext representation. Also use more b/i/code tags in docs/hacking.html.in. --- HACKING | 602 +++++++++++++++++++++++++++++--------------------- Makefile.am | 8 + docs/hacking.html.in | 351 ++++++++++++++++-------------- docs/hacking1.xsl | 28 +++ docs/hacking2.xsl | 146 ++++++++++++ docs/wrapstring.xsl | 56 +++++ 6 files changed, 772 insertions(+), 419 deletions(-) create mode 100644 docs/hacking1.xsl create mode 100644 docs/hacking2.xsl create mode 100644 docs/wrapstring.xsl diff --git a/HACKING b/HACKING index a9a9b49..bf563c3 100644 --- a/HACKING +++ b/HACKING @@ -1,18 +1,19 @@ -*- buffer-read-only: t -*- vi: set ro: DO NOT EDIT THIS FILE! IT IS GENERATED AUTOMATICALLY! - Libvirt contributor guidelines - ============================== + + + Contributor guidelines + ====================== + General tips for contributing patches ===================================== +(1) Discuss any large changes on the mailing list first. Post patches early and +listen to feedback. -(1) Discuss any large changes on the mailing list first. Post patches -early and listen to feedback. - -(2) Post patches in unified diff format. A command similar to this -should work: +(2) Post patches in unified diff format. A command similar to this should work: diff -urp libvirt.orig/ libvirt.modified/ > libvirt-myfeature.patch @@ -20,15 +21,15 @@ or: git diff > libvirt-myfeature.patch -(3) Split large changes into a series of smaller patches, self-contained -if possible, with an explanation of each patch and an explanation of how -the sequence of patches fits together. +(3) Split large changes into a series of smaller patches, self-contained if +possible, with an explanation of each patch and an explanation of how the +sequence of patches fits together. -(4) Make sure your patches apply against libvirt GIT. Developers -only follow GIT and don't care much about released versions. +(4) Make sure your patches apply against libvirt GIT. Developers only follow GIT +and don't care much about released versions. -(5) Run the automated tests on your code before submitting any changes. -In particular, configure with compile warnings set to -Werror: +(5) Run the automated tests on your code before submitting any changes. In +particular, configure with compile warnings set to -Werror: ./configure --enable-compile-warnings=error @@ -47,28 +48,29 @@ VIR_TEST_DEBUG may provide larger amounts of information: VIR_TEST_DEBUG=1 make check (or) VIR_TEST_DEBUG=2 make check -Also, individual tests can be run from inside the 'tests/' directory, like: +Also, individual tests can be run from inside the "tests/" directory, like: ./qemuxml2xmltest -(6) Update tests and/or documentation, particularly if you are adding -a new feature or changing the output of a program. +(6) Update tests and/or documentation, particularly if you are adding a new +feature or changing the output of a program. -There is more on this subject, including lots of links to background -reading on the subject, on this page: - http://et.redhat.com/~rjones/how-to-supply-code-to-open-source-projects/ +There is more on this subject, including lots of links to background reading +on the subject, on + Richard Jones' guide to working with open source projects + http://et.redhat.com/~rjones/how-to-supply-code-to-open-source-projects/ Code indentation ================ Libvirt's C source code generally adheres to some basic code-formatting -conventions. The existing code base is not totally consistent on this -front, but we do prefer that contributed code be formatted similarly. -In short, use spaces-not-TABs for indentation, use 4 spaces for each -indentation level, and other than that, follow the K&R style. +conventions. The existing code base is not totally consistent on this front, +but we do prefer that contributed code be formatted similarly. In short, use +spaces-not-TABs for indentation, use 4 spaces for each indentation level, and +other than that, follow the K&R style. If you use Emacs, add the following to one of one of your start-up files (e.g., ~/.emacs), to help ensure that you get indentation right: @@ -82,15 +84,15 @@ If you use Emacs, add the following to one of one of your start-up files (setq c-indent-level 4) (setq c-basic-offset 4)) (add-hook 'c-mode-hook - '(lambda () (if (string-match "/libvirt" (buffer-file-name)) - (libvirt-c-mode)))) + '(lambda () (if (string-match "/libvirt" (buffer-file-name)) + (libvirt-c-mode)))) + Code formatting (especially for new code) ========================================= -With new code, we can be even more strict. -Please apply the following function (using GNU indent) to any new code. -Note that this also gives you an idea of the type of spacing we prefer -around operators and keywords: +With new code, we can be even more strict. Please apply the following function +(using GNU indent) to any new code. Note that this also gives you an idea of +the type of spacing we prefer around operators and keywords: indent-libvirt() { @@ -99,66 +101,63 @@ around operators and keywords: --no-tabs "$@" } -Note that sometimes you'll have to post-process that output further, by -piping it through "expand -i", since some leading TABs can get through. -Usually they're in macro definitions or strings, and should be converted -anyhow. +Note that sometimes you'll have to post-process that output further, by piping +it through "expand -i", since some leading TABs can get through. Usually +they're in macro definitions or strings, and should be converted anyhow. Curly braces ============ Omit the curly braces around an "if", "while", "for" etc. body only when that body occupies a single line. In every other case we require the braces. This -ensures that it is trivially easy to identify a single-*statement* loop: each -has only one *line* in its body. +ensures that it is trivially easy to identify a single-'statement' loop: each +has only one 'line' in its body. Omitting braces with a single-line body is fine: - while (expr) // one-line body -> omitting curly braces is ok - single_line_stmt (); + while (expr) // one-line body -> omitting curly braces is ok + single_line_stmt(); However, the moment your loop/if/else body extends onto a second line, for whatever reason (even if it's just an added comment), then you should add braces. Otherwise, it would be too easy to insert a statement just before that -comment (without adding braces), thinking it is already a multi-statement -loop: +comment (without adding braces), thinking it is already a multi-statement loop: - while (true) // BAD! multi-line body with no braces - /* comment... */ - single_line_stmt (); + while (true) // BAD! multi-line body with no braces + /* comment... */ + single_line_stmt(); Do this instead: - while (true) { // Always put braces around a multi-line body. - /* comment... */ - single_line_stmt (); - } + while (true) { // Always put braces around a multi-line body. + /* comment... */ + single_line_stmt(); + } There is one exception: when the second body line is not at the same indentation level as the first body line: - if (expr) - die ("a diagnostic that would make this line" - " extend past the 80-column limit")); + if (expr) + die("a diagnostic that would make this line" + " extend past the 80-column limit")); It is safe to omit the braces in the code above, since the further-indented second body line makes it obvious that this is still a single-statement body. - To reiterate, don't do this: - if (expr) // BAD: no braces around... - while (expr_2) { // ... a multi-line body - ... - } + if (expr) // BAD: no braces around... + while (expr_2) { // ... a multi-line body + ... + } Do this, instead: - if (expr) { - while (expr_2) { - ... - } - } + if (expr) { + while (expr_2) { + ... + } + } However, there is one exception in the other direction, when even a one-line block should have braces. That occurs when that one-line, brace-less block is @@ -167,47 +166,47 @@ case, either put braces around the "else" block, or negate the "if"-condition and swap the bodies, putting the one-line block first and making the longer, multi-line block be the "else" block. - if (expr) { - ... - ... - } - else - x = y; // BAD: braceless "else" with braced "then" + if (expr) { + ... + ... + } + else + x = y; // BAD: braceless "else" with braced "then" This is preferred, especially when the multi-line body is more than a few -lines long, because it is easier to read and grasp the semantics of an if- -then-else block when the simpler block occurs first, rather than after the +lines long, because it is easier to read and grasp the semantics of an +if-then-else block when the simpler block occurs first, rather than after the more involved block: - if (!expr) - x = y; // putting the smaller block first is more readable - else { - ... - ... - } + if (!expr) + x = y; // putting the smaller block first is more readable + else { + ... + ... + } If you'd rather not negate the condition, then at least add braces: - if (expr) { - ... - ... - } else { - x = y; - } + if (expr) { + ... + ... + } else { + x = y; + } Preprocessor ============ For variadic macros, stick with C99 syntax: -#define vshPrint(_ctl, ...) fprintf(stdout, __VA_ARGS__) + #define vshPrint(_ctl, ...) fprintf(stdout, __VA_ARGS__) -Use parenthesis when checking if a macro is defined, and use -indentation to track nesting: +Use parenthesis when checking if a macro is defined, and use indentation to +track nesting: -#if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE) -# define fallocate(a,ignored,b,c) posix_fallocate(a,b,c) -#endif + #if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE) + # define fallocate(a,ignored,b,c) posix_fallocate(a,b,c) + #endif C types @@ -216,199 +215,235 @@ Use the right type. Scalars ------- -If you're using "int" or "long", odds are good that there's a better type. -If a variable is counting something, be sure to declare it with an -unsigned type. -If it's memory-size-related, use size_t (use ssize_t only if required). -If it's file-size related, use uintmax_t, or maybe off_t. -If it's file-offset related (i.e., signed), use off_t. -If it's just counting small numbers use "unsigned int"; -(on all but oddball embedded systems, you can assume that that -type is at least four bytes wide). -If a variable has boolean semantics, give it the "bool" type -and use the corresponding "true" and "false" macros. It's ok -to include <stdbool.h>, since libvirt's use of gnulib ensures -that it exists and is usable. -In the unusual event that you require a specific width, use a -standard type like int32_t, uint32_t, uint64_t, etc. - -While using "bool" is good for readability, it comes with minor caveats: - - Don't use "bool" in places where the type size must be constant across - all systems, like public interfaces and on-the-wire protocols. Note - that it would be possible (albeit wasteful) to use "bool" in libvirt's - logical wire protocol, since XDR maps that to its lower-level bool_t - type, which *is* fixed-size. - - Don't compare a bool variable against the literal, "true", - since a value with a logical non-false value need not be "1". - I.e., don't write "if (seen == true) ...". Rather, write "if (seen)...". - -Of course, take all of the above with a grain of salt. If you're about -to use some system interface that requires a type like size_t, pid_t or -off_t, use matching types for any corresponding variables. - -Also, if you try to use e.g., "unsigned int" as a type, and that -conflicts with the signedness of a related variable, sometimes -it's best just to use the *wrong* type, if "pulling the thread" -and fixing all related variables would be too invasive. - -Finally, while using descriptive types is important, be careful not to -go overboard. If whatever you're doing causes warnings, or requires -casts, then reconsider or ask for help. +- If you're using "int" or "long", odds are good that there's a better type. + +- If a variable is counting something, be sure to declare it with an unsigned +type. + +- If it's memory-size-related, use "size_t" (use "ssize_t" only if required). + +- If it's file-size related, use uintmax_t, or maybe "off_t". + +- If it's file-offset related (i.e., signed), use "off_t". + +- If it's just counting small numbers use "unsigned int"; (on all but oddball +embedded systems, you can assume that that type is at least four bytes wide). + +- If a variable has boolean semantics, give it the "bool" type and use the +corresponding "true" and "false" macros. It's ok to include <stdbool.h>, since +libvirt's use of gnulib ensures that it exists and is usable. + +- In the unusual event that you require a specific width, use a standard type +like "int32_t", "uint32_t", "uint64_t", etc. + +- While using "bool" is good for readability, it comes with minor caveats: + +-- Don't use "bool" in places where the type size must be constant across all +systems, like public interfaces and on-the-wire protocols. Note that it would +be possible (albeit wasteful) to use "bool" in libvirt's logical wire +protocol, since XDR maps that to its lower-level "bool_t" type, which *is* +fixed-size. + +-- Don't compare a bool variable against the literal, "true", since a value with +a logical non-false value need not be "1". I.e., don't write "if (seen == +true) ...". Rather, write "if (seen)...". + + + + + +Of course, take all of the above with a grain of salt. If you're about to use +some system interface that requires a type like "size_t", "pid_t" or "off_t", +use matching types for any corresponding variables. + +Also, if you try to use e.g., "unsigned int" as a type, and that conflicts +with the signedness of a related variable, sometimes it's best just to use the +*wrong* type, if 'pulling the thread' and fixing all related variables would +be too invasive. + +Finally, while using descriptive types is important, be careful not to go +overboard. If whatever you're doing causes warnings, or requires casts, then +reconsider or ask for help. Pointers -------- -Ensure that all of your pointers are "const-correct". -Unless a pointer is used to modify the pointed-to storage, -give it the "const" attribute. That way, the reader knows -up-front that this is a read-only pointer. Perhaps more -importantly, if we're diligent about this, when you see a non-const -pointer, you're guaranteed that it is used to modify the storage -it points to, or it is aliased to another pointer that is. +Ensure that all of your pointers are 'const-correct'. Unless a pointer is used +to modify the pointed-to storage, give it the "const" attribute. That way, the +reader knows up-front that this is a read-only pointer. Perhaps more +importantly, if we're diligent about this, when you see a non-const pointer, +you're guaranteed that it is used to modify the storage it points to, or it is +aliased to another pointer that is. Low level memory management =========================== - Use of the malloc/free/realloc/calloc APIs is deprecated in the libvirt -codebase, because they encourage a number of serious coding bugs and do -not enable compile time verification of checks for NULL. Instead of these +codebase, because they encourage a number of serious coding bugs and do not +enable compile time verification of checks for NULL. Instead of these routines, use the macros from memory.h - - eg to allocate a single object: +- e.g. to allocate a single object: - virDomainPtr domain; + virDomainPtr domain; + + if (VIR_ALLOC(domain) < 0) { + virReportOOMError(); + return NULL; + } + + + +- e.g. to allocate an array of objects + + virDomainPtr domains; + int ndomains = 10; + + if (VIR_ALLOC_N(domains, ndomains) < 0) { + virReportOOMError(); + return NULL; + } + + + +- e.g. to allocate an array of object pointers + + virDomainPtr *domains; + int ndomains = 10; + + if (VIR_ALLOC_N(domains, ndomains) < 0) { + virReportOOMError(); + return NULL; + } - if (VIR_ALLOC(domain) < 0) { - virReportOOMError(); - return NULL; - } - - eg to allocate an array of objects +- e.g. to re-allocate the array of domains to be longer - virDomainPtr domains; - int ndomains = 10; + ndomains = 20 - if (VIR_ALLOC_N(domains, ndomains) < 0) { - virReportOOMError(); - return NULL; - } + if (VIR_REALLOC_N(domains, ndomains) < 0) { + virReportOOMError(); + return NULL; + } - - eg to allocate an array of object pointers - virDomainPtr *domains; - int ndomains = 10; - if (VIR_ALLOC_N(domains, ndomains) < 0) { - virReportOOMError(); - return NULL; - } +- e.g. to free the domain - - eg to re-allocate the array of domains to be longer + VIR_FREE(domain); - ndomains = 20 - if (VIR_REALLOC_N(domains, ndomains) < 0) { - virReportOOMError(); - return NULL; - } - - eg to free the domain - VIR_FREE(domain); File handling ============= - Use of the close() API is deprecated in libvirt code base to help avoiding double-closing of a file descriptor. Instead of this API, use the macro from files.h - - eg close a file descriptor +- e.g. close a file descriptor + + if (VIR_CLOSE(fd) < 0) { + virReportSystemError(errno, _("failed to close file")); + } + + + +- eg close a file descriptor in an error path, without losing the previous errno +value + + VIR_FORCE_CLOSE(fd); + + - if (VIR_CLOSE(fd) < 0) { - virReportSystemError(errno, _("failed to close file")); - } - - eg close a file descriptor in an error path, without losing the previous - errno value - VIR_FORCE_CLOSE(fd); String comparisons ================== +Do not use the strcmp, strncmp, etc functions directly. Instead use one of the +following semantically named macros + +- For strict equality: + + STREQ(a,b) + STRNEQ(a,b) + + + +- For case insensitive equality: + + STRCASEEQ(a,b) + STRCASENEQ(a,b) + + + +- For strict equality of a substring: + + STREQLEN(a,b,n) + STRNEQLEN(a,b,n) -Do not use the strcmp, strncmp, etc functions directly. Instead use -one of the following semantically named macros - - For strict equality: - STREQ(a,b) - STRNEQ(a,b) +- For case insensitive equality of a substring: - - For case insensitive equality: - STRCASEEQ(a,b) - STRCASENEQ(a,b) + STRCASEEQLEN(a,b,n) + STRCASENEQLEN(a,b,n) - - For strict equality of a substring: - STREQLEN(a,b,n) - STRNEQLEN(a,b,n) - - For case insensitive equality of a substring: +- For strict equality of a prefix: + + STRPREFIX(a,b) - STRCASEEQLEN(a,b,n) - STRCASENEQLEN(a,b,n) - - For strict equality of a prefix: - STRPREFIX(a,b) String copying ============== +Do not use the strncpy function. According to the man page, it does *not* +guarantee a NULL-terminated buffer, which makes it extremely dangerous to use. +Instead, use one of the functionally equivalent functions: + + virStrncpy(char *dest, const char *src, size_t n, size_t destbytes) -Do not use the strncpy function. According to the man page, it does -*not* guarantee a NULL-terminated buffer, which makes it extremely dangerous -to use. Instead, use one of the functionally equivalent functions: +The first three arguments have the same meaning as for strncpy; namely the +destination, source, and number of bytes to copy, respectively. The last +argument is the number of bytes available in the destination string; if a copy +of the source string (including a \0) will not fit into the destination, no +bytes are copied and the routine returns NULL. Otherwise, n bytes from the +source are copied into the destination and a trailing \0 is appended. - - virStrncpy(char *dest, const char *src, size_t n, size_t destbytes) - The first three arguments have the same meaning as for strncpy; namely the - destination, source, and number of bytes to copy, respectively. The last - argument is the number of bytes available in the destination string; if a - copy of the source string (including a \0) will not fit into the - destination, no bytes are copied and the routine returns NULL. - Otherwise, n bytes from the source are copied into the destination and a - trailing \0 is appended. + virStrcpy(char *dest, const char *src, size_t destbytes) - - virStrcpy(char *dest, const char *src, size_t destbytes) - Use this variant if you know you want to copy the entire src string - into dest. Note that this is a macro, so arguments could be - evaluated more than once. This is equivalent to - virStrncpy(dest, src, strlen(src), destbytes) +Use this variant if you know you want to copy the entire src string into dest. +Note that this is a macro, so arguments could be evaluated more than once. +This is equivalent to virStrncpy(dest, src, strlen(src), destbytes) - - virStrcpyStatic(char *dest, const char *src) - Use this variant if you know you want to copy the entire src string - into dest *and* you know that your destination string is a static string - (i.e. that sizeof(dest) returns something meaningful). Note that - this is a macro, so arguments could be evaluated more than once. This is - equivalent to virStrncpy(dest, src, strlen(src), sizeof(dest)). + virStrcpyStatic(char *dest, const char *src) +Use this variant if you know you want to copy the entire src string into dest +*and* you know that your destination string is a static string (i.e. that +sizeof(dest) returns something meaningful). Note that this is a macro, so +arguments could be evaluated more than once. This is equivalent to +virStrncpy(dest, src, strlen(src), sizeof(dest)). Variable length string buffer ============================= - -If there is a need for complex string concatenations, avoid using -the usual sequence of malloc/strcpy/strcat/snprintf functions and -make use of the virBuffer API described in buf.h +If there is a need for complex string concatenations, avoid using the usual +sequence of malloc/strcpy/strcat/snprintf functions and make use of the +virBuffer API described in buf.h eg typical usage is as follows: char * - somefunction(...) { + somefunction(...) + { virBuffer buf = VIR_BUFFER_INITIALIZER; ... @@ -432,11 +467,9 @@ eg typical usage is as follows: Include files ============= - -There are now quite a large number of include files, both libvirt -internal and external, and system includes. To manage all this -complexity it's best to stick to the following general plan for all -*.c source files: +There are now quite a large number of include files, both libvirt internal and +external, and system includes. To manage all this complexity it's best to +stick to the following general plan for all *.c source files: /* * Copyright notice @@ -461,59 +494,114 @@ complexity it's best to stick to the following general plan for all #include "util.h" Any libvirt internal header files. #include "buf.h" - static myInternalFunc () The actual code. + static myInternalFunc() The actual code. { - ... + ... -Of particular note: *DO NOT* include libvirt/libvirt.h or -libvirt/virterror.h. It is included by "internal.h" already and there -are some special reasons why you cannot include these files -explicitly. +Of particular note: *Do not* include libvirt/libvirt.h or libvirt/virterror.h. +It is included by "internal.h" already and there are some special reasons why +you cannot include these files explicitly. Printf-style functions ====================== +Whenever you add a new printf-style function, i.e., one with a format string +argument and following "..." in its prototype, be sure to use gcc's printf +attribute directive in the prototype. For example, here's the one for +virAsprintf, in util.h: + + int virAsprintf(char **strp, const char *fmt, ...) + ATTRIBUTE_FORMAT(printf, 2, 3); + +This makes it so gcc's -Wformat and -Wformat-security options can do their +jobs and cross-check format strings with the number and types of arguments. + + +Use of goto +=========== +The use of goto is not forbidden, and goto is widely used throughout libvirt. +While the uncontrolled use of goto will quickly lead to unmaintainable code, +there is a place for it in well structured code where its use increases +readability and maintainability. In general, if goto is used for error +recovery, it's likely to be ok, otherwise, be cautious or avoid it all +together. + +The typical use of goto is to jump to cleanup code in the case of a long list +of actions, any of which may fail and cause the entire operation to fail. In +this case, a function will have a single label at the end of the function. +It's almost always ok to use this style. In particular, if the cleanup code +only involves free'ing memory, then having multiple labels is overkill. +VIR_FREE() and every function named XXXFree() in libvirt is required to handle +NULL as its arg. Thus you can safely call free on all the variables even if +they were not yet allocated (yes they have to have been initialized to NULL). +This is much simpler and clearer than having multiple labels. + +There are a couple of signs that a particular use of goto is not ok: + +- You're using multiple labels. If you find yourself using multiple labels, +you're strongly encouraged to rework your code to eliminate all but one of +them. -Whenever you add a new printf-style function, i.e., one with a format -string argument and following "..." in its prototype, be sure to use -gcc's printf attribute directive in the prototype. For example, here's -the one for virAsprintf, in util.h: +- The goto jumps back up to a point above the current line of code being +executed. Please use some combination of looping constructs to re-execute code +instead; it's almost certainly going to be more understandable by others. One +well-known exception to this rule is restarting an i/o operation following +EINTR. - int virAsprintf(char **strp, const char *fmt, ...) - ATTRIBUTE_FMT_PRINTF(2, 3); +- The goto jumps down to an arbitrary place in the middle of a function followed +by further potentially failing calls. You should almost certainly be using a +conditional and a block instead of a goto. Perhaps some of your function's +logic would be better pulled out into a helper function. -This makes it so gcc's -Wformat and -Wformat-security options can do -their jobs and cross-check format strings with the number and types -of arguments. +Although libvirt does not encourage the Linux kernel wind/unwind style of +multiple labels, there's a good general discussion of the issue archived at - Libvirt committer guidelines - ============================ + KernelTrap + http://kerneltrap.org/node/553/2131 -The AUTHORS files indicates the list of people with commit access right -who can actually merge the patches. +When using goto, please use one of these standard labels if it makes sense: + + error: A path only taken upon return with an error code + cleanup: A path taken upon return with success code + optional error + no_memory: A path only taken upon return with an OOM error code + retry: If needing to jump upwards (eg retry on EINTR) + + +Libvirt committer guidelines +============================ +The AUTHORS files indicates the list of people with commit access right who +can actually merge the patches. The general rule for committing a patch is to make sure it has been reviewed -properly in the mailing-list first, usually if a couple of people gave an -ACK or +1 to a patch and nobody raised an objection on the list it should -be good to go. If the patch touches a part of the code where you're not the -main maintainer or not have a very clear idea of how things work, it's better -to wait for a more authoritative feedback though. Before committing please -also rebuild locally and run 'make check syntax-check' and make sure they -don't raise error. Try to look for warnings too for example configure with - --enable-compile-warnings=error +properly in the mailing-list first, usually if a couple of people gave an ACK +or +1 to a patch and nobody raised an objection on the list it should be good +to go. If the patch touches a part of the code where you're not the main +maintainer, or where you do not have a very clear idea of how things work, +it's better to wait for a more authoritative feedback though. Before +committing, please also rebuild locally, run 'make check syntax-check', and +make sure you don't raise errors. Try to look for warnings too; for example, +configure with + + --enable-compile-warnings=error + which adds -Werror to compile flags, so no warnings get missed -Exceptions to that 'review and approval on the list first' is fixing failures -to build: - - if a recently committed patch breaks compilation on a platform - or for a given driver then it's fine to commit a minimal fix - directly without getting the review feedback first - - similarly, if make check or make syntax-check breaks, if there is - an obvious fix, it's fine to commit immediately -The patch should still be sent to the list (or tell what the fix was if -trivial) and 'make check syntax-check' should pass too before committing -anything -Similar fixes for documentation and code comments can be managed -in the same way, but still make sure they get reviewed if non-trivial. +An exception to 'review and approval on the list first' is fixing failures to +build: + +- if a recently committed patch breaks compilation on a platform or for a given +driver, then it's fine to commit a minimal fix directly without getting the +review feedback first + +- if make check or make syntax-check breaks, if there is an obvious fix, it's +fine to commit immediately. The patch should still be sent to the list (or +tell what the fix was if trivial), and 'make check syntax-check' should pass +too, before committing anything + +- fixes for documentation and code comments can be managed in the same way, but +still make sure they get reviewed if non-trivial. + + + diff --git a/Makefile.am b/Makefile.am index d05b7da..915adbe 100644 --- a/Makefile.am +++ b/Makefile.am @@ -48,6 +48,8 @@ EXTRA_DIST = \ pkgconfigdir = $(libdir)/pkgconfig pkgconfig_DATA = libvirt.pc +all: NEWS HACKING + NEWS: $(top_srcdir)/docs/news.xsl $(top_srcdir)/docs/news.html.in -@(if [ -x $(XSLTPROC) ] ; then \ $(XSLTPROC) --nonet $(top_srcdir)/docs/news.xsl \ @@ -56,6 +58,12 @@ NEWS: $(top_srcdir)/docs/news.xsl $(top_srcdir)/docs/news.html.in | perl -pe 's/[ \t]+$$//' \ > $@-t && mv $@-t $@ ; fi ); +HACKING: $(top_srcdir)/docs/hacking1.xsl $(top_srcdir)/docs/hacking2.xsl \ + $(top_srcdir)/docs/wrapstring.xsl $(top_srcdir)/docs/hacking.html.in + -@(if [ -x $(XSLTPROC) ] ; then \ + $(XSLTPROC) --nonet $(top_srcdir)/docs/hacking1.xsl $(top_srcdir)/docs/hacking.html.in | \ + $(XSLTPROC) --nonet $(top_srcdir)/docs/hacking2.xsl - \ + > $@-t && mv $@-t $@ ; fi ); rpm: clean @(unset CDPATH ; $(MAKE) dist && rpmbuild -ta $(distdir).tar.gz) diff --git a/docs/hacking.html.in b/docs/hacking.html.in index bd8b443..88db01a 100644 --- a/docs/hacking.html.in +++ b/docs/hacking.html.in @@ -5,20 +5,21 @@ <ul id="toc"></ul> <h2><a name="patches">General tips for contributing patches</a></h2> - <ol> <li>Discuss any large changes on the mailing list first. Post patches early and listen to feedback.</li> <li>Post patches in unified diff format. A command similar to this should work: - <pre> - diff -urp libvirt.orig/ libvirt.modified/ > libvirt-myfeature.patch</pre> +<pre> + diff -urp libvirt.orig/ libvirt.modified/ > libvirt-myfeature.patch +</pre> or: - <pre> - git diff > libvirt-myfeature.patch</pre> +<pre> + git diff > libvirt-myfeature.patch +</pre> </li> <li>Split large changes into a series of smaller patches, self-contained if possible, with an explanation of each patch and an explanation of how @@ -27,35 +28,39 @@ only follow GIT and don't care much about released versions.</li> <li>Run the automated tests on your code before submitting any changes. In particular, configure with compile warnings set to -Werror: - <pre> - ./configure --enable-compile-warnings=error</pre> +<pre> + ./configure --enable-compile-warnings=error +</pre> and run the tests: - <pre> +<pre> make check make syntax-check - make -C tests valgrind</pre> + make -C tests valgrind +</pre> The latter test checks for memory leaks. - - If you encounter any failing tests, the VIR_TEST_DEBUG - environment variable may provide extra information to debug - the failures. Larger values of VIR_TEST_DEBUG may provide - larger amounts of information: - + + If you encounter any failing tests, the VIR_TEST_DEBUG + environment variable may provide extra information to debug + the failures. Larger values of VIR_TEST_DEBUG may provide + larger amounts of information: + - <pre> +<pre> VIR_TEST_DEBUG=1 make check (or) - VIR_TEST_DEBUG=2 make check</pre> - - Also, individual tests can be run from inside the 'tests/' - directory, like: - - <pre> - ./qemuxml2xmltest</pre> + VIR_TEST_DEBUG=2 make check +</pre> + + Also, individual tests can be run from inside the <code>tests/</code> + directory, like: + +<pre> + ./qemuxml2xmltest +</pre> </li> <li>Update tests and/or documentation, particularly if you are adding @@ -82,7 +87,7 @@ If you use Emacs, add the following to one of one of your start-up files (e.g., ~/.emacs), to help ensure that you get indentation right: - <pre> +<pre> ;;; When editing C sources in libvirt, use this style. (defun libvirt-c-mode () "C mode with adjusted defaults for use with libvirt." @@ -105,7 +110,7 @@ around operators and keywords: - <pre> +<pre> indent-libvirt() { indent -bad -bap -bbb -bli4 -br -ce -brs -cs -i4 -l75 -lc75 \ @@ -116,7 +121,7 @@ Note that sometimes you'll have to post-process that output further, by - piping it through "expand -i", since some leading TABs can get through. + piping it through <code>expand -i</code>, since some leading TABs can get through. Usually they're in macro definitions or strings, and should be converted anyhow. @@ -125,18 +130,20 @@ <h2><a name="curly_braces">Curly braces</a></h2> - Omit the curly braces around an "if", "while", "for" etc. body only + Omit the curly braces around an <code>if</code>, <code>while</code>, + <code>for</code> etc. body only when that body occupies a single line. In every other case we require the braces. This ensures that it is trivially easy to identify a - single-*statement* loop: each has only one *line* in its body. + single-statement loop: each has only one line in its body. Omitting braces with a single-line body is fine: - <pre> +<pre> while (expr) // one-line body -> omitting curly braces is ok - single_line_stmt ();</pre> + single_line_stmt(); +</pre> However, the moment your loop/if/else body extends onto a second @@ -146,26 +153,29 @@ it is already a multi-statement loop: - <pre> +<pre> while (true) // BAD! multi-line body with no braces /* comment... */ - single_line_stmt ();</pre> + single_line_stmt(); +</pre> Do this instead: - <pre> +<pre> while (true) { // Always put braces around a multi-line body. /* comment... */ - single_line_stmt (); - }</pre> + single_line_stmt(); + } +</pre> There is one exception: when the second body line is not at the same indentation level as the first body line: - <pre> +<pre> if (expr) - die ("a diagnostic that would make this line" - " extend past the 80-column limit"));</pre> + die("a diagnostic that would make this line" + " extend past the 80-column limit")); +</pre> It is safe to omit the braces in the code above, since the @@ -177,40 +187,44 @@ To reiterate, don't do this: - <pre> +<pre> if (expr) // BAD: no braces around... while (expr_2) { // ... a multi-line body ... - }</pre> + } +</pre> Do this, instead: - <pre> +<pre> if (expr) { while (expr_2) { ... } - }</pre> + } +</pre> However, there is one exception in the other direction, when even a one-line block should have braces. That occurs when that one-line, - brace-less block is an "else" block, and the corresponding "then" block - *does* use braces. In that case, either put braces around the "else" - block, or negate the "if"-condition and swap the bodies, putting the + brace-less block is an <code>else</code> block, and the corresponding + <code>then</code> block does use braces. In that case, either + put braces around the <code>else</code> block, or negate the + <code>if</code>-condition and swap the bodies, putting the one-line block first and making the longer, multi-line block be the - "else" block. + <code>else</code> block. - <pre> +<pre> if (expr) { ... ... } else - x = y; // BAD: braceless "else" with braced "then"</pre> + x = y; // BAD: braceless "else" with braced "then" +</pre> This is preferred, especially when the multi-line body is more than a @@ -219,43 +233,45 @@ after the more involved block: - <pre> +<pre> if (!expr) x = y; // putting the smaller block first is more readable else { ... ... - }</pre> + } +</pre> If you'd rather not negate the condition, then at least add braces: - <pre> +<pre> if (expr) { ... ... } else { x = y; - }</pre> + } +</pre> <h2><a href="types">Preprocessor</a></h2> For variadic macros, stick with C99 syntax: - <pre> +<pre> #define vshPrint(_ctl, ...) fprintf(stdout, __VA_ARGS__) - </pre> +</pre> Use parenthesis when checking if a macro is defined, and use indentation to track nesting: - <pre> +<pre> #if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_FALLOCATE) # define fallocate(a,ignored,b,c) posix_fallocate(a,b,c) #endif - </pre> +</pre> <h2><a href="types">C types</a></h2> @@ -266,45 +282,51 @@ <h3>Scalars</h3> <ul> - <li>If you're using "int" or "long", odds are good that there's a better type.</li> + <li>If you're using <code>int</code> or <code>long</code>, odds are + good that there's a better type.</li> <li>If a variable is counting something, be sure to declare it with an unsigned type.</li> - <li>If it's memory-size-related, use size_t (use ssize_t only if required).</li> - <li>If it's file-size related, use uintmax_t, or maybe off_t.</li> - <li>If it's file-offset related (i.e., signed), use off_t.</li> - <li>If it's just counting small numbers use "unsigned int"; + <li>If it's memory-size-related, use <code>size_t</code> (use + <code>ssize_t</code> only if required).</li> + <li>If it's file-size related, use uintmax_t, or maybe <code>off_t</code>.</li> + <li>If it's file-offset related (i.e., signed), use <code>off_t</code>.</li> + <li>If it's just counting small numbers use <code>unsigned int</code>; (on all but oddball embedded systems, you can assume that that type is at least four bytes wide).</li> - <li>If a variable has boolean semantics, give it the "bool" type - and use the corresponding "true" and "false" macros. It's ok - to include <stdbool.h>, since libvirt's use of gnulib ensures + <li>If a variable has boolean semantics, give it the <code>bool</code> type + and use the corresponding <code>true</code> and <code>false</code> macros. + It's ok to include <stdbool.h>, since libvirt's use of gnulib ensures that it exists and is usable.</li> <li>In the unusual event that you require a specific width, use a - standard type like int32_t, uint32_t, uint64_t, etc.</li> - <li>While using "bool" is good for readability, it comes with minor caveats: + standard type like <code>int32_t</code>, <code>uint32_t</code>, + <code>uint64_t</code>, etc.</li> + <li>While using <code>bool</code> is good for readability, it comes with + minor caveats: <ul> - <li>Don't use "bool" in places where the type size must be constant across + <li>Don't use <code>bool</code> in places where the type size must be constant across all systems, like public interfaces and on-the-wire protocols. Note - that it would be possible (albeit wasteful) to use "bool" in libvirt's - logical wire protocol, since XDR maps that to its lower-level bool_t - type, which *is* fixed-size.</li> - <li>Don't compare a bool variable against the literal, "true", - since a value with a logical non-false value need not be "1". - I.e., don't write "if (seen == true) ...". Rather, write "if (seen)...".</li> + that it would be possible (albeit wasteful) to use <code>bool</code> in libvirt's + logical wire protocol, since XDR maps that to its lower-level <code>bool_t</code> + type, which is fixed-size.</li> + <li>Don't compare a bool variable against the literal, <code>true</code>, + since a value with a logical non-false value need not be <code>1</code>. + I.e., don't write <code>if (seen == true) ...</code>. Rather, + write <code>if (seen)...</code>.</li> </ul> </li> </ul> Of course, take all of the above with a grain of salt. If you're about - to use some system interface that requires a type like size_t, pid_t or - off_t, use matching types for any corresponding variables. + to use some system interface that requires a type like <code>size_t</code>, + <code>pid_t</code> or <code>off_t</code>, use matching types for any + corresponding variables. - Also, if you try to use e.g., "unsigned int" as a type, and that + Also, if you try to use e.g., <code>unsigned int</code> as a type, and that conflicts with the signedness of a related variable, sometimes - it's best just to use the *wrong* type, if "pulling the thread" + it's best just to use the wrong type, if pulling the thread and fixing all related variables would be too invasive. @@ -317,9 +339,9 @@ <h3>Pointers</h3> - Ensure that all of your pointers are "const-correct". + Ensure that all of your pointers are const-correct. Unless a pointer is used to modify the pointed-to storage, - give it the "const" attribute. That way, the reader knows + give it the <code>const</code> attribute. That way, the reader knows up-front that this is a read-only pointer. Perhaps more importantly, if we're diligent about this, when you see a non-const pointer, you're guaranteed that it is used to modify the storage @@ -336,57 +358,57 @@ <ul> - <li>eg to allocate a single object: - + <li>e.g. to allocate a single object: <pre> - virDomainPtr domain; + virDomainPtr domain; - if (VIR_ALLOC(domain) < 0) { - virReportOOMError(); - return NULL; - } -</pre></li> - - <li>eg to allocate an array of objects + if (VIR_ALLOC(domain) < 0) { + virReportOOMError(); + return NULL; + } +</pre> + </li> + <li>e.g. to allocate an array of objects <pre> - virDomainPtr domains; - int ndomains = 10; - - if (VIR_ALLOC_N(domains, ndomains) < 0) { - virReportOOMError(); - return NULL; - } -</pre></li> + virDomainPtr domains; + int ndomains = 10; - <li>eg to allocate an array of object pointers + if (VIR_ALLOC_N(domains, ndomains) < 0) { + virReportOOMError(); + return NULL; + } +</pre> + </li> + <li>e.g. to allocate an array of object pointers <pre> - virDomainPtr *domains; - int ndomains = 10; + virDomainPtr *domains; + int ndomains = 10; - if (VIR_ALLOC_N(domains, ndomains) < 0) { - virReportOOMError(); - return NULL; - } -</pre></li> - - <li>eg to re-allocate the array of domains to be longer + if (VIR_ALLOC_N(domains, ndomains) < 0) { + virReportOOMError(); + return NULL; + } +</pre> + </li> + <li>e.g. to re-allocate the array of domains to be longer <pre> - ndomains = 20 - - if (VIR_REALLOC_N(domains, ndomains) < 0) { - virReportOOMError(); - return NULL; - } -</pre></li> + ndomains = 20 - <li>eg to free the domain + if (VIR_REALLOC_N(domains, ndomains) < 0) { + virReportOOMError(); + return NULL; + } +</pre> + </li> + <li>e.g. to free the domain <pre> - VIR_FREE(domain); -</pre></li> + VIR_FREE(domain); +</pre> + </li> </ul> <h2><a name="file_handling">File handling</a></h2> @@ -398,20 +420,21 @@ <ul> - <li>eg close a file descriptor - + <li>e.g. close a file descriptor <pre> - if (VIR_CLOSE(fd) < 0) { - virReportSystemError(errno, _("failed to close file")); - } -</pre></li> + if (VIR_CLOSE(fd) < 0) { + virReportSystemError(errno, _("failed to close file")); + } +</pre> + </li> <li>eg close a file descriptor in an error path, without losing the previous errno value <pre> - VIR_FORCE_CLOSE(fd); -</pre></li> + VIR_FORCE_CLOSE(fd); +</pre> + </li> </ul> <h2><a name="string_comparision">String comparisons</a></h2> @@ -423,39 +446,36 @@ <ul> <li>For strict equality: - <pre> - STREQ(a,b) - STRNEQ(a,b) +<pre> + STREQ(a,b) + STRNEQ(a,b) </pre> </li> <li>For case insensitive equality: - <pre> - STRCASEEQ(a,b) - STRCASENEQ(a,b) +<pre> + STRCASEEQ(a,b) + STRCASENEQ(a,b) </pre> </li> <li>For strict equality of a substring: - - <pre> - STREQLEN(a,b,n) - STRNEQLEN(a,b,n) +<pre> + STREQLEN(a,b,n) + STRNEQLEN(a,b,n) </pre> </li> <li>For case insensitive equality of a substring: - - <pre> - STRCASEEQLEN(a,b,n) - STRCASENEQLEN(a,b,n) +<pre> + STRCASEEQLEN(a,b,n) + STRCASENEQLEN(a,b,n) </pre> </li> <li>For strict equality of a prefix: - - <pre> - STRPREFIX(a,b) +<pre> + STRPREFIX(a,b) </pre> </li> </ul> @@ -469,7 +489,10 @@ it extremely dangerous to use. Instead, use one of the functionally equivalent functions: - <pre>virStrncpy(char *dest, const char *src, size_t n, size_t destbytes)</pre> + +<pre> + virStrncpy(char *dest, const char *src, size_t n, size_t destbytes) +</pre> The first three arguments have the same meaning as for strncpy; namely the destination, source, and number of bytes to copy, @@ -481,8 +504,9 @@ trailing \0 is appended. - <pre>virStrcpy(char *dest, const char *src, size_t destbytes)</pre> - +<pre> + virStrcpy(char *dest, const char *src, size_t destbytes) +</pre> Use this variant if you know you want to copy the entire src string into dest. Note that this is a macro, so arguments could @@ -490,11 +514,12 @@ virStrncpy(dest, src, strlen(src), destbytes) - <pre>virStrcpyStatic(char *dest, const char *src)</pre> - +<pre> + virStrcpyStatic(char *dest, const char *src) +</pre> Use this variant if you know you want to copy the entire src - string into dest *and* you know that your destination string is + string into dest and you know that your destination string is a static string (i.e. that sizeof(dest) returns something meaningful). Note that this is a macro, so arguments could be evaluated more than once. This is equivalent to @@ -511,9 +536,10 @@ eg typical usage is as follows: - <pre> +<pre> char * - somefunction(...) { + somefunction(...) + { virBuffer buf = VIR_BUFFER_INITIALIZER; ... @@ -545,7 +571,7 @@ *.c source files: - <pre> +<pre> /* * Copyright notice * .... @@ -561,7 +587,7 @@ #include <limits.h> #if HAVE_NUMACTL Some system includes aren't supported - # include <numa.h> everywhere so need these #if guards. + # include <numa.h> everywhere so need these #if guards. #endif #include "internal.h" Include this first, after system includes. @@ -569,13 +595,13 @@ #include "util.h" Any libvirt internal header files. #include "buf.h" - static myInternalFunc () The actual code. + static myInternalFunc() The actual code. { - ... + ... </pre> - Of particular note: *DO NOT* include libvirt/libvirt.h or + Of particular note: Do not include libvirt/libvirt.h or libvirt/virterror.h. It is included by "internal.h" already and there are some special reasons why you cannot include these files explicitly. @@ -591,9 +617,9 @@ the one for virAsprintf, in util.h: - <pre> - int virAsprintf(char **strp, const char *fmt, ...) - ATTRIBUTE_FORMAT(printf, 2, 3); +<pre> + int virAsprintf(char **strp, const char *fmt, ...) + ATTRIBUTE_FORMAT(printf, 2, 3); </pre> @@ -654,7 +680,7 @@ Although libvirt does not encourage the Linux kernel wind/unwind style of multiple labels, there's a good general discussion of the issue archived at - <a href=http://kerneltrap.org/node/553/2131>KernelTrap</a> + <a href="http://kerneltrap.org/node/553/2131">KernelTrap</a> @@ -662,11 +688,12 @@ makes sense: - <pre> +<pre> error: A path only taken upon return with an error code cleanup: A path taken upon return with success code + optional error no_memory: A path only taken upon return with an OOM error code - retry: If needing to jump upwards (eg retry on EINTR)</pre> + retry: If needing to jump upwards (eg retry on EINTR) +</pre> @@ -691,7 +718,7 @@ configure with <pre> - --enable-compile-warnings=error + --enable-compile-warnings=error </pre> which adds -Werror to compile flags, so no warnings get missed diff --git a/docs/hacking1.xsl b/docs/hacking1.xsl new file mode 100644 index 0000000..982fa8d --- /dev/null +++ b/docs/hacking1.xsl @@ -0,0 +1,28 @@ +<?xml version="1.0"?> +<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> + +<xsl:output method="xml" encoding="UTF-8" indent="no"/> + + + +<xsl:template match="/"> + <xsl:apply-templates/> +</xsl:template> + + + +<xsl:template match="@*|node()"> + <xsl:copy> + <xsl:apply-templates select="@*|node()"/> + </xsl:copy> +</xsl:template> + + + + +<xsl:template match="b">*<xsl:apply-templates/>*</xsl:template> +<xsl:template match="i">'<xsl:apply-templates/>'</xsl:template> +<xsl:template match="code">"<xsl:apply-templates/>"</xsl:template> + +</xsl:stylesheet> diff --git a/docs/hacking2.xsl b/docs/hacking2.xsl new file mode 100644 index 0000000..89e777b --- /dev/null +++ b/docs/hacking2.xsl @@ -0,0 +1,146 @@ +<?xml version="1.0"?> +<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> + +<xsl:import href="wrapstring.xsl"/> + +<xsl:output method="text" encoding="UTF-8" indent="no"/> + +<xsl:strip-space elements="*"/> + + + +<xsl:variable name="newline"> +<xsl:text> +</xsl:text> +</xsl:variable> + + + +<xsl:template match="/"> +<xsl:text>-*- buffer-read-only: t -*- vi: set ro: +DO NOT EDIT THIS FILE! IT IS GENERATED AUTOMATICALLY! + + + +</xsl:text> +<xsl:apply-templates/> +</xsl:template> + + + + +<xsl:template match="h1"> +<xsl:text> </xsl:text> +<xsl:value-of select="normalize-space(.)"/> +<xsl:text> + </xsl:text>====================== +</xsl:template> + + + + +<xsl:template name="underline"> + <xsl:param name="text" select="normalize-space(.)"/> + <xsl:param name="text-length" select="string-length($text)"/> + <xsl:param name="char" select="'='"/> + <xsl:param name="line" select="$char"/> + <xsl:choose> + <xsl:when test="$text-length > 1"> + <xsl:call-template name="underline"> + <xsl:with-param name="text" select="$text"/> + <xsl:with-param name="text-length" select="$text-length - 1"/> + <xsl:with-param name="char" select="$char"/> + <xsl:with-param name="line" select="concat($line,$char)"/> + </xsl:call-template> + </xsl:when> + <xsl:otherwise> +<xsl:value-of select="$text"/> +<xsl:value-of select="$newline"/> +<xsl:value-of select="$line"/> +<xsl:value-of select="$newline"/> + </xsl:otherwise> + </xsl:choose> +</xsl:template> + + + +<xsl:template match="h2"> +<xsl:value-of select="$newline"/> +<xsl:call-template name="underline"/> +</xsl:template> + + + +<xsl:template match="h3"> +<xsl:call-template name="underline"> +<xsl:with-param name="char" select="'-'"/> +</xsl:call-template> +</xsl:template> + + + + +<xsl:template match="text()"> +<xsl:call-template name="wrap-string"> +<xsl:with-param name="str" select="normalize-space(.)"/> +<xsl:with-param name="wrap-col" select="80"/> +<xsl:with-param name="break-mark" select="$newline"/> +</xsl:call-template> +</xsl:template> + + + +<xsl:template match="ol|ul|p"> +<xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/> +</xsl:template> + + + +<xsl:template match="ol/li"> +<xsl:choose> +<xsl:when test=".//node()[position()=last()]/self::pre">(<xsl:value-of select="position()"/>) <xsl:apply-templates/> +</xsl:when> + +<xsl:otherwise>(<xsl:value-of select="position()"/>) <xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/> +</xsl:otherwise> +</xsl:choose> +</xsl:template> + + + +<xsl:template match="ul/li">- <xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/> +</xsl:template> + + + +<xsl:template match="li/ul/li">-- <xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/> +</xsl:template> + + + + +<xsl:template match="li/ul"><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/><xsl:apply-templates/> +</xsl:template> + + + +<xsl:template match="pre"> +<xsl:choose> +<xsl:when test="starts-with(.,'
')"><xsl:value-of select="substring(.,2)"/><xsl:value-of select="$newline"/> +</xsl:when> +<xsl:otherwise> +<xsl:value-of select="."/><xsl:value-of select="$newline"/> +</xsl:otherwise> +</xsl:choose> +</xsl:template> + + + +<xsl:template match="a"> +<xsl:value-of select="$newline"/><xsl:value-of select="$newline"/> +<xsl:text> </xsl:text><xsl:apply-templates/> +<xsl:value-of select="$newline"/> +<xsl:text> </xsl:text><xsl:value-of select="@href"/> +</xsl:template> + +</xsl:stylesheet> diff --git a/docs/wrapstring.xsl b/docs/wrapstring.xsl new file mode 100644 index 0000000..b468a70 --- /dev/null +++ b/docs/wrapstring.xsl @@ -0,0 +1,56 @@ +<?xml version="1.0"?> +<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> + + + + +<xsl:template name="wrap-string"> + <xsl:param name="str" /> + <xsl:param name="wrap-col" /> + <xsl:param name="break-mark" /> + <xsl:param name="pos" select="0" /> + <xsl:choose> + <xsl:when test="contains( $str, ' ' )"> + <xsl:variable name="first-word" select="substring-before( $str, ' ' )" /> + <xsl:variable name="pos-now" select="$pos + 1 + string-length( $first-word )" /> + <xsl:choose> + <xsl:when test="$pos > 0 and $pos-now >= $wrap-col"> + <xsl:copy-of select="$break-mark" /> + <xsl:call-template name="wrap-string"> + <xsl:with-param name="str" select="$str" /> + <xsl:with-param name="wrap-col" select="$wrap-col" /> + <xsl:with-param name="break-mark" select="$break-mark" /> + <xsl:with-param name="pos" select="0" /> + </xsl:call-template> + </xsl:when> + <xsl:otherwise> + <xsl:if test="$pos > 0"> + <xsl:text> </xsl:text> + </xsl:if> + <xsl:value-of select="$first-word" /> + <xsl:call-template name="wrap-string"> + <xsl:with-param name="str" select="substring-after( $str, ' ' )" /> + <xsl:with-param name="wrap-col" select="$wrap-col" /> + <xsl:with-param name="break-mark" select="$break-mark" /> + <xsl:with-param name="pos" select="$pos-now" /> + </xsl:call-template> + </xsl:otherwise> + </xsl:choose> + </xsl:when> + <xsl:otherwise> + <xsl:choose> + <xsl:when test="$pos + string-length( $str ) >= $wrap-col"> + <xsl:copy-of select="$break-mark" /> + </xsl:when> + <xsl:otherwise> + <xsl:if test="$pos > 0"> + <xsl:text> </xsl:text> + </xsl:if> + </xsl:otherwise> + </xsl:choose> + <xsl:value-of select="$str" /> + </xsl:otherwise> + </xsl:choose> +</xsl:template> + +</xsl:stylesheet> -- 1.7.0.4

2 6

[libvirt] C# bindings coverage update
by arnaud.champion＠devatom.fr 12 Nov '10

12 Nov '10

?Hi Justin, I have sended a patch today. Here is the coverage which come with. Regards, Arnaud

2 2

[libvirt] [PATCH] docs: updated csharp pages with latest info
by Justin Clift 12 Nov '10

12 Nov '10

--- docs/csharp.html.in | 13 ++++++++----- 1 files changed, 8 insertions(+), 5 deletions(-) diff --git a/docs/csharp.html.in b/docs/csharp.html.in index dc67d7c..45ff35a 100644 --- a/docs/csharp.html.in +++ b/docs/csharp.html.in @@ -174,7 +174,7 @@ git clone git://libvirt.org/libvirt-csharp.git <tr><td>enum</td><td>virDomainEventType</td><td>Yes</td><td>Yes</td><td>virEventRegisterImpl</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr> <tr><td>enum</td><td>virDomainEventUndefinedDetailType</td><td>Yes</td><td>Yes</td><td>virEventRegisterImpl</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr> <tr><td>enum</td><td>virDomainEventWatchdogAction</td><td>No</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> - <tr><td>struct</td><td>virDomainInfo</td><td>Yes</td><td>Yes</td><td> </td><td>Yes</td><td> </td><td> </td><td> </td></tr> + <tr><td>struct</td><td>virDomainInfo</td><td>Yes</td><td>Yes</td><td>virConnectSetErrorFunc</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr> <tr><td>struct</td><td>virDomainInterfaceStatsStruct</td><td>Yes</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> <tr><td>struct</td><td>virDomainJobInfo</td><td>No</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>enum</td><td>virDomainJobType</td><td>No</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> @@ -213,6 +213,7 @@ git clone git://libvirt.org/libvirt-csharp.git <tr><td>enum</td><td>virStreamFlags</td><td>No</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>struct</td><td>virVcpuInfo</td><td>No</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>enum</td><td>virVcpuState</td><td>No</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> + <tr><td>struct</td><td>virError</td><td>Yes</td><td>Yes</td><td>virConnectSetErrorFunc</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr> </table>   @@ -316,22 +317,22 @@ git clone git://libvirt.org/libvirt-csharp.git <tr><td>virDomainLookupByName</td><td>Yes</td><td>function</td><td>Yes</td><td> </td><td>Yes</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainLookupByUUID</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainLookupByUUIDString</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> - <tr><td>virDomainManagedSave </td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> + <tr><td>virDomainManagedSave</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainManagedSaveRemove</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainMemoryPeek</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainMemoryStats</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainMigrate</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainMigrateSetMaxDowntime</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> - <tr><td>virDomainMigrateToURI </td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> + <tr><td>virDomainMigrateToURI</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainPinVcpu</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainReboot</td><td>Yes</td><td>function</td><td>Yes</td><td> </td><td>Yes</td><td> </td><td> </td><td> </td></tr> - <tr><td>virDomainRef </td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> + <tr><td>virDomainRef</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainRestore</td><td>Yes </td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainResume </td><td>Yes</td><td>function</td><td>Yes</td><td> </td><td>Yes</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainRevertToSnapshot</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainSave</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainSetAutostart</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> - <tr><td>virDomainSetMaxMemory </td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> + <tr><td>virDomainSetMaxMemory</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainSetMemory</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainSetSchedulerParameters</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virDomainSetVcpus</td><td>Yes</td><td>function</td><td>No</td><td> </td><td>Maybe</td><td> </td><td> </td><td> </td></tr> @@ -493,6 +494,8 @@ git clone git://libvirt.org/libvirt-csharp.git <tr><td>virStreamSendAll</td><td>No</td><td>function</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virStreamSinkFunc</td><td>No</td><td>delegate</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td>virStreamSourceFunc</td><td>No</td><td>delegate</td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> + <tr><td>virGetLastError</td><td>Yes</td><td>function</td><td>Yes</td><td>virConnectSetErrorFunc</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr> + <tr><td>virConnSetErrorFunc</td><td>Yes</td><td>function</td><td>Yes</td><td>virConnectSetErrorFunc</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr> </table> </body> </html> -- 1.7.3

1 1