Update.

2003-03-02 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/bits/posix_opt.h: Define _POSIX_MONOTONIC_CLOCK. * linuxthreads/sysdeps/unix/sysv/linux/i386/bits/posix_opt.h: Likewise.
2025-07-28 00:21:52 +03:00 · 2003-03-03 04:57:09 +00:00
parent 1e543c0cc6
commit ad0e8eb0a5
11 changed files with 433 additions and 37 deletions
--- a/sysdeps/unix/sysv/linux/clock_gettime.c
+++ b/sysdeps/unix/sysv/linux/clock_gettime.c
@ -0,0 +1,76 @@
+/* Copyright (C) 2003 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+
+#include "kernel-features.h"
+
+
+#ifdef __ASSUME_POSIX_TIMERS
+/* This means the REALTIME and MONOTONIC clock are definitely
+   supported in the kernel.  */
+# define SYSDEP_GETTIME \
+  case CLOCK_REALTIME:							      \
+  case CLOCK_MONOTONIC:							      \
+    retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp);		      \
+    break
+#elif defined __NR_clock_gettime
+/* Is the syscall known to exist?  */
+int __libc_missing_posix_timers attribute_hidden;
+
+/* The REALTIME and MONOTONIC clock might be available.  Try the
+   syscall first.  */
+# define SYSDEP_GETTIME \
+  case CLOCK_REALTIME:							      \
+  case CLOCK_MONOTONIC:							      \
+    {									      \
+      int e = EINVAL;							      \
+									      \
+      if (!__libc_missing_posix_timers)					      \
+	{								      \
+	  INTERNAL_SYSCALL_DECL (err);					      \
+	  int r = INTERNAL_SYSCALL (clock_gettime, err, 2, clock_id, tp);     \
+	  if (!INTERNAL_SYSCALL_ERROR_P (r, err))			      \
+	    {								      \
+	      retval = 0;						      \
+	      break;							      \
+	    }								      \
+									      \
+	  e = INTERNAL_SYSCALL_ERRNO (r, err);				      \
+	  if (e == ENOSYS)						      \
+	    {								      \
+	      __libc_missing_posix_timers = 1;				      \
+	      e = EINVAL;						      \
+	    }								      \
+	}								      \
+									      \
+      /* Fallback code.  */						      \
+      if (e == EINVAL && clock_id == CLOCK_REALTIME)			      \
+	HANDLE_REALTIME;						      \
+      else								      \
+	__set_errno (e);						      \
+    }									      \
+    break
+#endif
+
+#ifdef __NR_clock_gettime
+/* We handled the REALTIME clock here.  */
+# define HANDLED_REALTIME	1
+#endif
+
+#include <sysdeps/unix/clock_gettime.c>