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os: Use fallback implementations when *_CLOEXEC are unavailable at build time

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On platforms without F_DUPFD_CLOEXEC, MSG_CMSG_CLOEXEC, or SOCK_CLOEXEC, we
should skip past their usage and just use the fcntl() fallback.

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
This commit is contained in:
Jeremy Huddleston Sequoia 2023-01-27 14:52:05 -08:00
parent a77aa44f0e
commit d8e90f4a16
2 changed files with 16 additions and 3 deletions
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13
tests/os-wrappers-test.c
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@ -61,10 +61,12 @@ socket_wrapper(int domain, int type, int protocol)
{
wrapped_calls_socket++;
#ifdef SOCK_CLOEXEC
if (fall_back && (type & SOCK_CLOEXEC)) {
errno = EINVAL;
return -1;
}
#endif
return socket(domain, type, protocol);
}
@ -78,12 +80,16 @@ fcntl_wrapper(int fd, int cmd, ...)
wrapped_calls_fcntl++;
#ifdef F_DUPFD_CLOEXEC
if (fall_back && (cmd == F_DUPFD_CLOEXEC)) {
errno = EINVAL;
return -1;
}
#endif
switch (cmd) {
#ifdef F_DUPFD_CLOEXEC
case F_DUPFD_CLOEXEC:
#endif
case F_DUPFD:
case F_SETFD:
va_start(ap, cmd);
@ -110,10 +116,12 @@ recvmsg_wrapper(int sockfd, struct msghdr *msg, int flags)
{
wrapped_calls_recvmsg++;
#ifdef MSG_CMSG_CLOEXEC
if (fall_back && (flags & MSG_CMSG_CLOEXEC)) {
errno = EINVAL;
return -1;
}
#endif
return recvmsg(sockfd, msg, flags);
}
@ -323,9 +331,10 @@ do_os_wrappers_recvmsg_cloexec(int n)
struct marshal_data data;
data.nr_fds_begin = count_open_fds();
#if HAVE_BROKEN_MSG_CMSG_CLOEXEC
#if HAVE_BROKEN_MSG_CMSG_CLOEXEC || !defined(MSG_CMSG_CLOEXEC)
/* We call the fallback directly on FreeBSD versions with a broken
* MSG_CMSG_CLOEXEC, so we don't call the local recvmsg() wrapper. */
* MSG_CMSG_CLOEXEC or platforms without MSG_CMSG_CLOEXEC, so we
* don't call the local recvmsg() wrapper. */
data.wrapped_calls = 0;
#else
data.wrapped_calls = n;