/* Copyright (C) 2003, 2004, 2005 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, see <http://www.gnu.org/licenses/>. */ #include <time.h> #include <errno.h> #include <sysdep-cancel.h> #include <bits/kernel-features.h> #include "kernel-posix-cpu-timers.h" #ifdef __ASSUME_POSIX_TIMERS /* We can simply use the syscall. The CPU clocks are not supported with this function. */ int clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, struct timespec *rem) { INTERNAL_SYSCALL_DECL (err); int r; if (clock_id == CLOCK_THREAD_CPUTIME_ID) return EINVAL; if (clock_id == CLOCK_PROCESS_CPUTIME_ID) clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); if (SINGLE_THREAD_P) r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem); else { int oldstate = LIBC_CANCEL_ASYNC (); r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem); LIBC_CANCEL_RESET (oldstate); } return (INTERNAL_SYSCALL_ERROR_P (r, err) ? INTERNAL_SYSCALL_ERRNO (r, err) : 0); } #else # ifdef __NR_clock_nanosleep /* 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_NANOSLEEP \ if (!__libc_missing_posix_timers) \ { \ clockid_t syscall_clockid; \ INTERNAL_SYSCALL_DECL (err); \ \ if (clock_id == CLOCK_THREAD_CPUTIME_ID) \ return EINVAL; \ if (clock_id == CLOCK_PROCESS_CPUTIME_ID) \ syscall_clockid = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); \ else \ syscall_clockid = clock_id; \ \ int oldstate = LIBC_CANCEL_ASYNC (); \ \ int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, \ syscall_clockid, flags, req, rem); \ \ LIBC_CANCEL_RESET (oldstate); \ \ if (!INTERNAL_SYSCALL_ERROR_P (r, err)) \ return 0; \ \ if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS) \ return INTERNAL_SYSCALL_ERRNO (r, err); \ \ __libc_missing_posix_timers = 1; \ } # endif # include <sysdeps/unix/clock_nanosleep.c> #endif