[libvirt] [PATCH] portability to non-glibc: don't use realpath(..., NULL)

Using realpath like that is not portable, and providing a buffer instead of NULL is wasteful and harder to code properly. Instead, use gnulib's canonicalize_file_name, which does the same job portably:
From 4afea6b59e2be6c28b45ef59a6a2f896eed44dba Mon Sep 17 00:00:00 2001 From: Jim Meyering <meyering@redhat.com> Date: Tue, 26 Jan 2010 17:13:45 +0100 Subject: [PATCH] portability to non-glibc: don't use realpath(..., NULL)
it causes a NULL-dereference on some systems like Solaris 10. * src/node_device/node_device_linux_sysfs.c. Include <stdlib.h>. (get_sriov_function): Use canonicalize_filen_name, not realpath. * bootstrap (modules): Add canonicalize-lgpl. --- bootstrap | 1 + src/node_device/node_device_linux_sysfs.c | 6 ++++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/bootstrap b/bootstrap index aec5d05..cc3c6ef 100755 --- a/bootstrap +++ b/bootstrap @@ -68,6 +68,7 @@ modules=' areadlink base64 c-ctype +canonicalize-lgpl close connect getaddrinfo diff --git a/src/node_device/node_device_linux_sysfs.c b/src/node_device/node_device_linux_sysfs.c index 33e658d..c1fce5d 100644 --- a/src/node_device/node_device_linux_sysfs.c +++ b/src/node_device/node_device_linux_sysfs.c @@ -24,6 +24,7 @@ #include <fcntl.h> #include <sys/stat.h> +#include <stdlib.h> #include "node_device_driver.h" #include "node_device_hal.h" @@ -242,7 +243,8 @@ out: static int get_sriov_function(const char *device_link, struct pci_config_address **bdf) { - char *device_path = NULL, *config_address = NULL; + char *config_address = NULL; + char *device_path = NULL; char errbuf[64]; int ret = SRIOV_ERROR; @@ -259,7 +261,7 @@ static int get_sriov_function(const char *device_link, } - device_path = realpath(device_link, device_path); + device_path = canonicalize_file_name (device_link); if (device_path == NULL) { memset(errbuf, '\0', sizeof(errbuf)); VIR_ERROR("Failed to resolve device link '%s': '%s'", device_link, -- 1.7.0.rc0.140.gfbe7

On Tue, Jan 26, 2010 at 05:48:59PM +0100, Jim Meyering wrote:
Using realpath like that is not portable, and providing a buffer instead of NULL is wasteful and harder to code properly. Instead, use gnulib's canonicalize_file_name, which does the same job portably:
From 4afea6b59e2be6c28b45ef59a6a2f896eed44dba Mon Sep 17 00:00:00 2001 From: Jim Meyering <meyering@redhat.com> Date: Tue, 26 Jan 2010 17:13:45 +0100 Subject: [PATCH] portability to non-glibc: don't use realpath(..., NULL)
it causes a NULL-dereference on some systems like Solaris 10. * src/node_device/node_device_linux_sysfs.c. Include <stdlib.h>. (get_sriov_function): Use canonicalize_filen_name, not realpath. * bootstrap (modules): Add canonicalize-lgpl. --- bootstrap | 1 + src/node_device/node_device_linux_sysfs.c | 6 ++++-- 2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/bootstrap b/bootstrap index aec5d05..cc3c6ef 100755 --- a/bootstrap +++ b/bootstrap @@ -68,6 +68,7 @@ modules=' areadlink base64 c-ctype +canonicalize-lgpl close connect getaddrinfo diff --git a/src/node_device/node_device_linux_sysfs.c b/src/node_device/node_device_linux_sysfs.c index 33e658d..c1fce5d 100644 --- a/src/node_device/node_device_linux_sysfs.c +++ b/src/node_device/node_device_linux_sysfs.c @@ -24,6 +24,7 @@
#include <fcntl.h> #include <sys/stat.h> +#include <stdlib.h>
#include "node_device_driver.h" #include "node_device_hal.h" @@ -242,7 +243,8 @@ out: static int get_sriov_function(const char *device_link, struct pci_config_address **bdf) { - char *device_path = NULL, *config_address = NULL; + char *config_address = NULL; + char *device_path = NULL; char errbuf[64]; int ret = SRIOV_ERROR;
@@ -259,7 +261,7 @@ static int get_sriov_function(const char *device_link,
}
- device_path = realpath(device_link, device_path); + device_path = canonicalize_file_name (device_link); if (device_path == NULL) { memset(errbuf, '\0', sizeof(errbuf)); VIR_ERROR("Failed to resolve device link '%s': '%s'", device_link,
ACK Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
participants (2)
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Daniel P. Berrange
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Jim Meyering