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os: wrap recvmsg(MSG_CMSG_CLOEXEC)

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Some system C libraries do not have MSG_CMSG_CLOEXEC. This flag would
automatically set O_CLOEXEC flag on any received file descriptors.

Provide a fallback that does it manually. If setting CLOEXEC fails, the
file descriptor is closed immediately, which will lead to failures but
avoid leaks. However, setting CLOEXEC is not really expected to fail
occasionally.

Add tests for the wrapper. The setup is copied from connection-test.c.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
This commit is contained in:
Pekka Paalanen 2012-03-21 16:00:23 +02:00
parent 2ccaf918ab
commit 35d5053c62
4 changed files with 229 additions and 1 deletions
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8
src/wayland-os.h
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@ -29,6 +29,10 @@ wl_os_socket_cloexec(int domain, int type, int protocol);
int
wl_os_dupfd_cloexec(int fd, long minfd);
ssize_t
wl_os_recvmsg_cloexec(int sockfd, struct msghdr *msg, int flags);
/*
* The following are for wayland-os.c and the unit tests.
* Do not use them elsewhere.
@ -44,6 +48,10 @@ wl_os_dupfd_cloexec(int fd, long minfd);
#define F_DUPFD_CLOEXEC 1030
#endif
#ifndef MSG_CMSG_CLOEXEC
#define MSG_CMSG_CLOEXEC 0x40000000
#endif
#endif /* __linux__ */
#endif