1 /* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
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.
8
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.
13
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/>. */
17
18 #include <time.h>
19 #include <errno.h>
20
21 #include <sysdep-cancel.h>
22 #include <bits/kernel-features.h>
23 #include "kernel-posix-cpu-timers.h"
24
25
26 #ifdef __ASSUME_POSIX_TIMERS
27 /* We can simply use the syscall. The CPU clocks are not supported
28 with this function. */
29 int
clock_nanosleep(clockid_t clock_id,int flags,const struct timespec * req,struct timespec * rem)30 clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
31 struct timespec *rem)
32 {
33 INTERNAL_SYSCALL_DECL (err);
34 int r;
35
36 if (clock_id == CLOCK_THREAD_CPUTIME_ID)
37 return EINVAL;
38 if (clock_id == CLOCK_PROCESS_CPUTIME_ID)
39 clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED);
40
41 if (SINGLE_THREAD_P)
42 r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem);
43 else
44 {
45 int oldstate = LIBC_CANCEL_ASYNC ();
46
47 r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req,
48 rem);
49
50 LIBC_CANCEL_RESET (oldstate);
51 }
52
53 return (INTERNAL_SYSCALL_ERROR_P (r, err)
54 ? INTERNAL_SYSCALL_ERRNO (r, err) : 0);
55 }
56
57 #else
58 # ifdef __NR_clock_nanosleep
59 /* Is the syscall known to exist? */
60 extern int __libc_missing_posix_timers attribute_hidden;
61
62 /* The REALTIME and MONOTONIC clock might be available. Try the
63 syscall first. */
64 # define SYSDEP_NANOSLEEP \
65 if (!__libc_missing_posix_timers) \
66 { \
67 clockid_t syscall_clockid; \
68 INTERNAL_SYSCALL_DECL (err); \
69 \
70 if (clock_id == CLOCK_THREAD_CPUTIME_ID) \
71 return EINVAL; \
72 if (clock_id == CLOCK_PROCESS_CPUTIME_ID) \
73 syscall_clockid = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); \
74 else \
75 syscall_clockid = clock_id; \
76 \
77 int oldstate = LIBC_CANCEL_ASYNC (); \
78 \
79 int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, \
80 syscall_clockid, flags, req, rem); \
81 \
82 LIBC_CANCEL_RESET (oldstate); \
83 \
84 if (!INTERNAL_SYSCALL_ERROR_P (r, err)) \
85 return 0; \
86 \
87 if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS) \
88 return INTERNAL_SYSCALL_ERRNO (r, err); \
89 \
90 __libc_missing_posix_timers = 1; \
91 }
92 # endif
93
94 # include <sysdeps/unix/clock_nanosleep.c>
95 #endif
96