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authorUlrich Drepper <drepper@redhat.com>2009-07-26 12:55:03 -0700
committerUlrich Drepper <drepper@redhat.com>2009-07-26 12:55:03 -0700
commitaa7492d20e5a2cef54dab7b41f534048b3eca479 (patch)
tree45a121112a357bc17af6cf04cea1b10167a37ffb /sysdeps/unix
parente28b969b49811a30887e7a252ac1804a055fe297 (diff)
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Compatibility of signalfd/eventfd with older kernels.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/eventfd.c15
-rw-r--r--sysdeps/unix/sysv/linux/kernel-features.h2
-rw-r--r--sysdeps/unix/sysv/linux/signalfd.c15
3 files changed, 26 insertions, 6 deletions
diff --git a/sysdeps/unix/sysv/linux/eventfd.c b/sysdeps/unix/sysv/linux/eventfd.c
index 4cd557983e..7f69ecdb8c 100644
--- a/sysdeps/unix/sysv/linux/eventfd.c
+++ b/sysdeps/unix/sysv/linux/eventfd.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2007, 2008 Free Software Foundation, Inc.
+/* Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -19,14 +19,21 @@
#include <errno.h>
#include <sys/eventfd.h>
#include <sysdep.h>
+#include <kernel-features.h>
int
eventfd (int count, int flags)
{
#ifdef __NR_eventfd2
- return INLINE_SYSCALL (eventfd2, 2, count, flags);
-#else
+ int res = INLINE_SYSCALL (eventfd2, 2, count, flags);
+# ifndef __ASSUME_EVENTFD2
+ if (res != -1 || errno != ENOSYS)
+# endif
+ return res;
+#endif
+
+#ifndef __ASSUME_EVENTFD2
/* The old system call has no flag parameter which is bad. So we have
to wait until we have to support to pass additional values to the
kernel (sys_indirect) before implementing setting flags like
@@ -43,5 +50,7 @@ eventfd (int count, int flags)
__set_errno (ENOSYS);
return -1;
# endif
+#elif !defined __NR_eventfd2
+# error "__ASSUME_EVENTFD2 defined but not __NR_eventfd2"
#endif
}
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index 4562515790..ff065effb5 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -516,6 +516,8 @@
# define __ASSUME_SOCK_CLOEXEC 1
# define __ASSUME_IN_NONBLOCK 1
# define __ASSUME_PIPE2 1
+# define __ASSUME_EVENTFD2 1
+# define __ASSUME_SIGNALFD4 1
#endif
/* Support for the accept4 syscall was added in 2.6.28. */
diff --git a/sysdeps/unix/sysv/linux/signalfd.c b/sysdeps/unix/sysv/linux/signalfd.c
index 9898f29231..c2d974a45d 100644
--- a/sysdeps/unix/sysv/linux/signalfd.c
+++ b/sysdeps/unix/sysv/linux/signalfd.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2007, 2008 Free Software Foundation, Inc.
+/* Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -20,14 +20,21 @@
#include <signal.h>
#include <sys/signalfd.h>
#include <sysdep.h>
+#include <kernel-features.h>
int
signalfd (int fd, const sigset_t *mask, int flags)
{
#ifdef __NR_signalfd4
- return INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags);
-#else
+ int res = INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags);
+# ifndef __ASSUME_SIGNALFD4
+ if (res != -1 || errno != ENOSYS)
+# endif
+ return res;
+#endif
+
+#ifndef __ASSUME_SIGNALFD4
/* The old system call has no flag parameter which is bad. So we have
to wait until we have to support to pass additional values to the
kernel (sys_indirect) before implementing setting flags like
@@ -44,5 +51,7 @@ signalfd (int fd, const sigset_t *mask, int flags)
__set_errno (ENOSYS);
return -1;
# endif
+#elif !defined __NR_signalfd4
+# error "__ASSUME_SIGNALFD4 defined but not __NR_signalfd4"
#endif
}