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authorRich Felker <dalias@aerifal.cx>2013-04-07 23:19:00 -0400
committerRich Felker <dalias@aerifal.cx>2013-04-07 23:19:00 -0400
commitbcd9302508e5b89cfdcf2a2acebdf05d88d7479e (patch)
treebbcb967c155de26caecd81153f1518e29fd6f9a6
parentcc11b422864f0eba97f8bc170e2c8275397bdf41 (diff)
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fix signalfd not to ignore flags
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.
-rw-r--r--src/linux/signalfd.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/src/linux/signalfd.c b/src/linux/signalfd.c
index 94de3627..da6bcedb 100644
--- a/src/linux/signalfd.c
+++ b/src/linux/signalfd.c
@@ -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);
 }