| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 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, write to the Free |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 17 | 02111-1307 USA. */ |
| 18 | |
| 19 | #include <time.h> |
| 20 | #include <errno.h> |
| 21 | |
| 22 | #include <sysdep-cancel.h> |
| 23 | #include <bits/kernel-features.h> |
| 24 | #include "kernel-posix-cpu-timers.h" |
| 25 | |
| 26 | |
| 27 | #ifdef __ASSUME_POSIX_TIMERS |
| 28 | /* We can simply use the syscall. The CPU clocks are not supported |
| 29 | with this function. */ |
| 30 | int |
| 31 | clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, |
| 32 | struct timespec *rem) |
| 33 | { |
| 34 | INTERNAL_SYSCALL_DECL (err); |
| 35 | int r; |
| 36 | |
| 37 | if (clock_id == CLOCK_THREAD_CPUTIME_ID) |
| 38 | return EINVAL; |
| 39 | if (clock_id == CLOCK_PROCESS_CPUTIME_ID) |
| 40 | clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); |
| 41 | |
| 42 | if (SINGLE_THREAD_P) |
| 43 | r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem); |
| 44 | else |
| 45 | { |
| 46 | int oldstate = LIBC_CANCEL_ASYNC (); |
| 47 | |
| 48 | r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, |
| 49 | rem); |
| 50 | |
| 51 | LIBC_CANCEL_RESET (oldstate); |
| 52 | } |
| 53 | |
| 54 | return (INTERNAL_SYSCALL_ERROR_P (r, err) |
| 55 | ? INTERNAL_SYSCALL_ERRNO (r, err) : 0); |
| 56 | } |
| 57 | |
| 58 | #else |
| 59 | # ifdef __NR_clock_nanosleep |
| 60 | /* Is the syscall known to exist? */ |
| 61 | extern int __libc_missing_posix_timers attribute_hidden; |
| 62 | |
| 63 | /* The REALTIME and MONOTONIC clock might be available. Try the |
| 64 | syscall first. */ |
| 65 | # define SYSDEP_NANOSLEEP \ |
| 66 | if (!__libc_missing_posix_timers) \ |
| 67 | { \ |
| 68 | clockid_t syscall_clockid; \ |
| 69 | INTERNAL_SYSCALL_DECL (err); \ |
| 70 | \ |
| 71 | if (clock_id == CLOCK_THREAD_CPUTIME_ID) \ |
| 72 | return EINVAL; \ |
| 73 | if (clock_id == CLOCK_PROCESS_CPUTIME_ID) \ |
| 74 | syscall_clockid = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); \ |
| 75 | else \ |
| 76 | syscall_clockid = clock_id; \ |
| 77 | \ |
| 78 | int oldstate = LIBC_CANCEL_ASYNC (); \ |
| 79 | \ |
| 80 | int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, \ |
| 81 | syscall_clockid, flags, req, rem); \ |
| 82 | \ |
| 83 | LIBC_CANCEL_RESET (oldstate); \ |
| 84 | \ |
| 85 | if (!INTERNAL_SYSCALL_ERROR_P (r, err)) \ |
| 86 | return 0; \ |
| 87 | \ |
| 88 | if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS) \ |
| 89 | return INTERNAL_SYSCALL_ERRNO (r, err); \ |
| 90 | \ |
| 91 | __libc_missing_posix_timers = 1; \ |
| 92 | } |
| 93 | # endif |
| 94 | |
| 95 | # include <sysdeps/unix/clock_nanosleep.c> |
| 96 | #endif |