diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sleep.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sleep.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/sysdeps/unix/sysv/linux/sleep.c b/sysdeps/unix/sysv/linux/sleep.c deleted file mode 100644 index 2a06d5aa49..0000000000 --- a/sysdeps/unix/sysv/linux/sleep.c +++ /dev/null @@ -1,149 +0,0 @@ -/* Implementation of the POSIX sleep function using nanosleep. - Copyright (C) 1996-2015 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. - - 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 <errno.h> -#include <time.h> -#include <signal.h> -#include <string.h> /* For the real memset prototype. */ -#include <unistd.h> -#include <sys/param.h> -#include <nptl/pthreadP.h> - - -#if 0 -static void -cl (void *arg) -{ - (void) __sigprocmask (SIG_SETMASK, arg, (sigset_t *) NULL); -} -#endif - - -/* We are going to use the `nanosleep' syscall of the kernel. But the - kernel does not implement the stupid SysV SIGCHLD vs. SIG_IGN - behaviour for this syscall. Therefore we have to emulate it here. */ -unsigned int -__sleep (unsigned int seconds) -{ - const unsigned int max - = (unsigned int) (((unsigned long int) (~((time_t) 0))) >> 1); - struct timespec ts; - sigset_t set, oset; - unsigned int result; - - /* This is not necessary but some buggy programs depend on this. */ - if (__glibc_unlikely (seconds == 0)) - { -#ifdef CANCELLATION_P - CANCELLATION_P (THREAD_SELF); -#endif - return 0; - } - - ts.tv_sec = 0; - ts.tv_nsec = 0; - again: - if (sizeof (ts.tv_sec) <= sizeof (seconds)) - { - /* Since SECONDS is unsigned assigning the value to .tv_sec can - overflow it. In this case we have to wait in steps. */ - ts.tv_sec += MIN (seconds, max); - seconds -= (unsigned int) ts.tv_sec; - } - else - { - ts.tv_sec = (time_t) seconds; - seconds = 0; - } - - /* Linux will wake up the system call, nanosleep, when SIGCHLD - arrives even if SIGCHLD is ignored. We have to deal with it - in libc. We block SIGCHLD first. */ - __sigemptyset (&set); - __sigaddset (&set, SIGCHLD); - if (__sigprocmask (SIG_BLOCK, &set, &oset)) - return -1; - - /* If SIGCHLD is already blocked, we don't have to do anything. */ - if (!__sigismember (&oset, SIGCHLD)) - { - int saved_errno; - struct sigaction oact; - - __sigemptyset (&set); - __sigaddset (&set, SIGCHLD); - - /* We get the signal handler for SIGCHLD. */ - if (__sigaction (SIGCHLD, (struct sigaction *) NULL, &oact) < 0) - { - saved_errno = errno; - /* Restore the original signal mask. */ - (void) __sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL); - __set_errno (saved_errno); - return -1; - } - - /* Note the sleep() is a cancellation point. But since we call - nanosleep() which itself is a cancellation point we do not - have to do anything here. */ - if (oact.sa_handler == SIG_IGN) - { - //__libc_cleanup_push (cl, &oset); - - /* We should leave SIGCHLD blocked. */ - while (1) - { - result = __nanosleep (&ts, &ts); - - if (result != 0 || seconds == 0) - break; - - if (sizeof (ts.tv_sec) <= sizeof (seconds)) - { - ts.tv_sec = MIN (seconds, max); - seconds -= (unsigned int) ts.tv_nsec; - } - } - - //__libc_cleanup_pop (0); - - saved_errno = errno; - /* Restore the original signal mask. */ - (void) __sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL); - __set_errno (saved_errno); - - goto out; - } - - /* We should unblock SIGCHLD. Restore the original signal mask. */ - (void) __sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL); - } - - result = __nanosleep (&ts, &ts); - if (result == 0 && seconds != 0) - goto again; - - out: - if (result != 0) - /* Round remaining time. */ - result = seconds + (unsigned int) ts.tv_sec + (ts.tv_nsec >= 500000000L); - - return result; -} -weak_alias (__sleep, sleep) |