Re: [libvirt PATCH 11/32] src: implement APIs for passing FDs over UNIX sockets

This is a simplified variant of gnulib's passfd module without the portability code that we do not require. Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/libvirt_private.syms | 5 ++ src/qemu/qemu_interface.c | 4 +- src/rpc/virnetsocket.c | 5 +- src/util/virfile.c | 5 +- src/util/virsocket.c | 142 +++++++++++++++++++++++++++++++++++++- src/util/virsocket.h | 3 + 6 files changed, 154 insertions(+), 10 deletions(-)

diff --git a/src/util/virsocket.c b/src/util/virsocket.c index 96b9ece2b7..0e3775ac44 100644 --- a/src/util/virsocket.c +++ b/src/util/virsocket.c @@ -19,10 +19,12 @@ #include <config.h> #include "virsocket.h" +#include "virutil.h" +#include "virfile.h" -#ifdef WIN32 +#include <fcntl.h> -# include <fcntl.h> +#ifdef WIN32 # define FD2SK(fd) _get_osfhandle(fd) # define SK2FD(sk) (_open_osfhandle((intptr_t) (sk), O_RDWR | O_BINARY)) @@ -365,3 +367,139 @@ vir_socket(int domain, int type, int protocol) } #endif /* WIN32 */ + +/* The code that uses CMSG_FIRSTHDR is enabled on + Linux, Mac OS X, FreeBSD, OpenBSD, NetBSD, AIX, OSF/1, Cygwin. + The code that uses HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS is enabled on + HP-UX, IRIX, Solaris. */ + +/* MSG_CMSG_CLOEXEC is defined only on Linux, as of 2011. */ +#ifndef MSG_CMSG_CLOEXEC +# define MSG_CMSG_CLOEXEC 0 +#endif + +#ifndef WIN32 +/* virSocketSendFD sends the file descriptor fd along the socket + to a process calling recvfd on the other end.