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add SOCK_CLOEXEC fallback for socketpair on old kernels

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as usual, this is non-atomic, but better than producing an error or
failing to set the close-on-exec flag at all.
This commit is contained in:
Rich Felker 2014-06-06 15:29:00 -04:00
parent abce315639
commit 1d348566e6
1 changed files with 19 additions and 1 deletions
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20
src/network/socketpair.c
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@ -1,7 +1,25 @@
#include <sys/socket.h>
#include <fcntl.h>
#include <errno.h>
#include "syscall.h"
int socketpair(int domain, int type, int protocol, int fd[2])
{
return socketcall(socketpair, domain, type, protocol, fd, 0, 0);
int r = socketcall(socketpair, domain, type, protocol, fd, 0, 0);
if (r<0 && (errno==EINVAL || errno==EPROTONOSUPPORT)
&& (type&(SOCK_CLOEXEC|SOCK_NONBLOCK))) {
r = socketcall(socketpair, domain,
type & ~(SOCK_CLOEXEC|SOCK_NONBLOCK),
protocol, fd, 0, 0);
if (r < 0) return r;
if (type & SOCK_CLOEXEC) {
__syscall(SYS_fcntl, fd[0], F_SETFD, FD_CLOEXEC);
__syscall(SYS_fcntl, fd[1], F_SETFD, FD_CLOEXEC);
}
if (type & SOCK_NONBLOCK) {
__syscall(SYS_fcntl, fd[0], F_SETFL, O_NONBLOCK);
__syscall(SYS_fcntl, fd[1], F_SETFL, O_NONBLOCK);
}
}
return r;
}