diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/clock_getres.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/clock_getres.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/clock_getres.c b/sysdeps/unix/sysv/linux/clock_getres.c new file mode 100644 index 0000000000..442fbd5705 --- /dev/null +++ b/sysdeps/unix/sysv/linux/clock_getres.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_GETRES \ + case CLOCK_REALTIME: \ + case CLOCK_MONOTONIC: \ + retval = INLINE_SYSCALL (clock_getres, 2, clock_id, res); \ + break +#elif defined __NR_clock_getres +/* Is the syscall known to exist? */ +extern int __libc_missing_posix_timers attribute_hidden; + +/* The REALTIME and MONOTONIC clock might be available. Try the + syscall first. */ +# define SYSDEP_GETRES \ + case CLOCK_REALTIME: \ + case CLOCK_MONOTONIC: \ + { \ + int e = EINVAL; \ + \ + if (!__libc_missing_posix_timers) \ + { \ + INTERNAL_SYSCALL_DECL (err); \ + int r = INTERNAL_SYSCALL (clock_getres, err, 2, clock_id, res); \ + 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_getres +/* We handled the REALTIME clock here. */ +# define HANDLED_REALTIME 1 +#endif + +#include <sysdeps/posix/clock_getres.c> |