define signalfd patch

If sys/signalfd.h does not exist, assume that it does not exist in glibc, rather than that it exists without a corresponding header file. Note that this version of the signalfd() wrapper function (unlike the version in glibc) falls back dynamically to the old signalfd system call if the signalfd4 system call is not implemented in the currently-running kernel; the version in glibc chooses the version of the signalfd system call to make via static build-time configuration. Signed-off-by: Michael K Johnson <johnsonm@rpath.com> Signed-off-by: Daniel Lezcnao <dlezcano@fr.ibm.com>

define signalfd patch
8ca61733 · Michael K. Johnson · Daniel Lezcano · 216061bf · 8ca61733
Commit 8ca61733 authored Mar 08, 2009 by Michael K. Johnson Committed by Daniel Lezcano Mar 08, 2009
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start.c src/lxc/start.c +28 -2

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--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -43,9 +43,35 @@
 #include <sys/poll.h>
 #ifdef HAVE_SYS_SIGNALFD_H 
-#include <sys/signalfd.h>
+#  include <sys/signalfd.h>
 #else
-extern int signalfd (int fd, const sigset_t *mask, int flags);
+#  ifndef __NR_signalfd4
+/* assume kernel headers are too old */
+#    if __i386__
+#      define __NR_signalfd4 327
+#    elif __x86_64__
+#      define __NR_signalfd4 289
+#    endif
+#endif
+#  ifndef __NR_signalfd
+/* assume kernel headers are too old */
+#    if __i386__
+#      define __NR_signalfd 321
+#    elif __x86_64__
+#      define __NR_signalfd 282
+#    endif
+#endif
+int signalfd(int fd, const sigset_t *mask, int flags)
+{
+	int retval;
+	retval = syscall (__NR_signalfd4, fd, mask, _NSIG / 8, flags);
+	if (errno == ENOSYS && flags == 0)
+		retval = syscall (__NR_signalfd, fd, mask, _NSIG / 8);
+	return retval;
+}
 #endif
 #if !HAVE_DECL_PR_CAPBSET_DROP