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MEDIUM: listener: provide a fallback for accept4() when not supported

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It happens that on some systems, the libc is recent enough to permit
building with accept4() but the kernel does not support it. The result
is then a disaster since no connection is accepted. We now detect this
and automatically fall back to accept() and fcntl() when this happens.
This commit is contained in:
Willy Tarreau 2012-10-22 19:32:55 +02:00
parent a068a2951d
commit 6b3b0d4736
1 changed files with 5 additions and 0 deletions
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5
src/listener.c
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@ -311,6 +311,11 @@ void listener_accept(int fd)
#ifdef USE_ACCEPT4
cfd = accept4(fd, (struct sockaddr *)&addr, &laddr, SOCK_NONBLOCK);
if (unlikely(cfd == -1 && errno == EINVAL)) {
/* unsupported syscall, fallback to normal accept()+fcntl() */
if ((cfd = accept(fd, (struct sockaddr *)&addr, &laddr)) != -1)
fcntl(cfd, F_SETFL, O_NONBLOCK);
}
#else
cfd = accept(fd, (struct sockaddr *)&addr, &laddr);
#endif