1 /* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
21 #include <sysdep-cancel.h>
22 #include <bits/kernel-features.h>
23 #include "kernel-posix-cpu-timers.h"
26 #ifdef __ASSUME_POSIX_TIMERS
27 /* We can simply use the syscall. The CPU clocks are not supported
28 with this function. */
30 clock_nanosleep (clockid_t clock_id
, int flags
, const struct timespec
*req
,
33 INTERNAL_SYSCALL_DECL (err
);
36 if (clock_id
== CLOCK_THREAD_CPUTIME_ID
)
38 if (clock_id
== CLOCK_PROCESS_CPUTIME_ID
)
39 clock_id
= MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED
);
42 r
= INTERNAL_SYSCALL (clock_nanosleep
, err
, 4, clock_id
, flags
, req
, rem
);
45 int oldstate
= LIBC_CANCEL_ASYNC ();
47 r
= INTERNAL_SYSCALL (clock_nanosleep
, err
, 4, clock_id
, flags
, req
,
50 LIBC_CANCEL_RESET (oldstate
);
53 return (INTERNAL_SYSCALL_ERROR_P (r
, err
)
54 ? INTERNAL_SYSCALL_ERRNO (r
, err
) : 0);
58 # ifdef __NR_clock_nanosleep
59 /* Is the syscall known to exist? */
60 extern int __libc_missing_posix_timers attribute_hidden
;
62 /* The REALTIME and MONOTONIC clock might be available. Try the
64 # define SYSDEP_NANOSLEEP \
65 if (!__libc_missing_posix_timers) \
67 clockid_t syscall_clockid; \
68 INTERNAL_SYSCALL_DECL (err); \
70 if (clock_id == CLOCK_THREAD_CPUTIME_ID) \
72 if (clock_id == CLOCK_PROCESS_CPUTIME_ID) \
73 syscall_clockid = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); \
75 syscall_clockid = clock_id; \
77 int oldstate = LIBC_CANCEL_ASYNC (); \
79 int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, \
80 syscall_clockid, flags, req, rem); \
82 LIBC_CANCEL_RESET (oldstate); \
84 if (!INTERNAL_SYSCALL_ERROR_P (r, err)) \
87 if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS) \
88 return INTERNAL_SYSCALL_ERRNO (r, err); \
90 __libc_missing_posix_timers = 1; \
94 # include <sysdeps/unix/clock_nanosleep.c>