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compatfd.c: Don't pass NULL pointer to SYS_signalfd 

Don't pass a NULL pointer in to SYS_signalfd in qemu_signalfd_available():
this isn't valid and Valgrind complains about it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
This commit is contained in:
Peter Maydell 2011-10-13 18:45:37 +01:00 committed by Andrzej Zaborowski
parent 1386d4c0f5
commit 7f84c1272b
1 changed files with 10 additions and 2 deletions
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12
compatfd.c
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@ -119,9 +119,17 @@ int qemu_signalfd(const sigset_t *mask)
bool qemu_signalfd_available(void)
{
#ifdef CONFIG_SIGNALFD
sigset_t mask;
int fd;
bool ok;
sigemptyset(&mask);
errno = 0;
syscall(SYS_signalfd, -1, NULL, _NSIG / 8);
return errno != ENOSYS;
fd = syscall(SYS_signalfd, -1, &mask, _NSIG / 8);
ok = (errno != ENOSYS);
if (fd >= 0) {
close(fd);
}
return ok;
#else
return false;
#endif