aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/clock_settime.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/unix/sysv/linux/clock_settime.c')
-rw-r--r--sysdeps/unix/sysv/linux/clock_settime.c77
1 files changed, 75 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/clock_settime.c b/sysdeps/unix/sysv/linux/clock_settime.c
index 5d19a09bf8..217ae3f29b 100644
--- a/sysdeps/unix/sysv/linux/clock_settime.c
+++ b/sysdeps/unix/sysv/linux/clock_settime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004, 2006 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
@@ -16,9 +16,64 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
+#include <errno.h>
#include <sysdep.h>
-#include "kernel-features.h"
+#include "kernel-posix-cpu-timers.h"
+#include <kernel-features.h>
+
+#ifndef HAVE_CLOCK_GETRES_VSYSCALL
+# undef INTERNAL_VSYSCALL
+# define INTERNAL_VSYSCALL INTERNAL_SYSCALL
+# undef INLINE_VSYSCALL
+# define INLINE_VSYSCALL INLINE_SYSCALL
+#else
+# include <bits/libc-vdso.h>
+#endif
+
+#if __ASSUME_POSIX_CPU_TIMERS <= 0 && defined __NR_clock_settime
+extern int __libc_missing_posix_timers attribute_hidden;
+extern int __libc_missing_posix_cpu_timers attribute_hidden;
+
+static int
+maybe_syscall_settime_cpu (clockid_t clock_id, const struct timespec *tp)
+{
+ int e = EINVAL;
+
+ if (!__libc_missing_posix_cpu_timers)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ int r = INTERNAL_SYSCALL (clock_settime, err, 2, clock_id, tp);
+ if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+ return 0;
+
+ e = INTERNAL_SYSCALL_ERRNO (r, err);
+# ifndef __ASSUME_POSIX_TIMERS
+ if (e == ENOSYS)
+ {
+ __libc_missing_posix_timers = 1;
+ __libc_missing_posix_cpu_timers = 1;
+ e = EINVAL;
+ }
+ else
+# endif
+ {
+ if (e == EINVAL)
+ {
+ /* Check whether the kernel supports CPU clocks at all.
+ If not, record it for the future. */
+ r = INTERNAL_VSYSCALL (clock_getres, err, 2,
+ MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
+ NULL);
+ if (INTERNAL_SYSCALL_ERROR_P (r, err))
+ __libc_missing_posix_cpu_timers = 1;
+ }
+ }
+ }
+
+ return e;
+}
+#endif
#ifdef __ASSUME_POSIX_TIMERS
@@ -73,4 +128,22 @@ extern int __libc_missing_posix_timers attribute_hidden;
# define HANDLED_REALTIME 1
#endif
+#if __ASSUME_POSIX_CPU_TIMERS > 0
+# define HANDLED_CPUTIME 1
+# define SYSDEP_SETTIME_CPU \
+ retval = INLINE_SYSCALL (clock_settime, 2, clock_id, tp)
+#elif defined __NR_clock_settime
+# define SYSDEP_SETTIME_CPU \
+ retval = maybe_syscall_settime_cpu (clock_id, tp); \
+ if (retval == 0) \
+ break; \
+ if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \
+ { \
+ __set_errno (retval); \
+ retval = -1; \
+ break; \
+ } \
+ do { } while (0)
+#endif
+
#include <sysdeps/unix/clock_settime.c>