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fix signalfd not to ignore flags

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also include fallback code for broken kernels that don't support the
flags. as usual, the fallback has a race condition that can leak file
descriptors.
This commit is contained in:
Rich Felker 2013-04-07 23:19:00 -04:00
commit bcd9302508
1 changed files with 12 additions and 1 deletions
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13
src/linux/signalfd.c
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@ -1,8 +1,19 @@
#include <sys/signalfd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include "syscall.h"
int signalfd(int fd, const sigset_t *sigs, int flags)
{
return syscall(SYS_signalfd, fd, sigs, _NSIG/8);
int ret = __syscall(SYS_signalfd4, fd, sigs, _NSIG/8, flags);
if (ret != -ENOSYS) return __syscall_ret(ret);
ret = __syscall(SYS_signalfd, fd, sigs, _NSIG/8);
if (ret >= 0) {
if (flags & SFD_CLOEXEC)
__syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
if (flags & SFD_NONBLOCK)
__syscall(SYS_fcntl, ret, F_SETFL, O_NONBLOCK);
}
return __syscall_ret(ret);
}