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freebsd-dev/lib/libc/gen/sleep.c

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BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
Fix SCM ID's.
2002-02-01 00:57:29 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include "namespace.h"
Fix LONG_MAX overflowing Return seconds if errno other than EINTR Add $Id Submitted by: bde with minor optimization by me
1997-10-17 09:35:50 +00:00
#include <errno.h>
#include <limits.h>
Cleanup #includes
1997-10-16 13:35:25 +00:00
#include <time.h>
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#include <unistd.h>
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include "un-namespace.h"
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
unsigned int
Add three-tier symbol naming in support of POSIX thread cancellation points. For library functions, the pattern is __sleep() <-- _libc_sleep() <-- sleep(). The arrows represent weak aliases. For system calls, the pattern is _read() <-- _libc_read() <-- read().
2000-01-12 09:23:48 +00:00
__sleep(seconds)
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
unsigned int seconds;
{
restore rev 1.23 to give clear SIGALRM handling example, 68 years are too long to affect real code
1998-09-08 09:44:46 +00:00
struct timespec time_to_sleep;
struct timespec time_remaining;
Temporarily restore old (itimer) sleep variant because new one (nanosleep) breaks Apache httpd badly: his childs died quickly after number of requests (SIGPIPE). To reproduce this bug start gdb /usr/local/sbin/httpd run -X and make some bunch of concurent requests (load the server pages from 3 different places f.e.) After short time httpd dies via SIGPIPE. It never dies with old sleep.c In real life it looks like lots of broken images on the pages or missing pages. Lynx says about Network read error, etc. It seems something wrong in nanosleep signal handling.
1997-05-17 08:32:42 +00:00
restore rev 1.23 to give clear SIGALRM handling example, 68 years are too long to affect real code
1998-09-08 09:44:46 +00:00
/*
* Avoid overflow when `seconds' is huge. This assumes that
* the maximum value for a time_t is >= INT_MAX.
*/
if (seconds > INT_MAX)
Add three-tier symbol naming in support of POSIX thread cancellation points. For library functions, the pattern is __sleep() <-- _libc_sleep() <-- sleep(). The arrows represent weak aliases. For system calls, the pattern is _read() <-- _libc_read() <-- read().
2000-01-12 09:23:48 +00:00
return (seconds - INT_MAX + __sleep(INT_MAX));
Fix LONG_MAX overflowing Return seconds if errno other than EINTR Add $Id Submitted by: bde with minor optimization by me
1997-10-17 09:35:50 +00:00
restore rev 1.23 to give clear SIGALRM handling example, 68 years are too long to affect real code
1998-09-08 09:44:46 +00:00
time_to_sleep.tv_sec = seconds;
time_to_sleep.tv_nsec = 0;
Simplify sytem call renaming. Instead of _foo() <-- _libc_foo <-- foo(), just use _foo() <-- foo(). In the case of a libpthread that doesn't do call conversion (such as linuxthreads and our upcoming libpthread), this is adequate. In the case of libc_r, we still need three names, which are now _thread_sys_foo() <-- _foo() <-- foo(). Convert all internal libc usage of: aio_suspend(), close(), fsync(), msync(), nanosleep(), open(), fcntl(), read(), and write() to _foo() instead of foo(). Remove all internal libc usage of: creat(), pause(), sleep(), system(), tcdrain(), wait(), and waitpid(). Make thread cancellation fully POSIX-compliant. Suggested by: deischen
2000-01-27 23:07:25 +00:00
if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
restore rev 1.23 to give clear SIGALRM handling example, 68 years are too long to affect real code
1998-09-08 09:44:46 +00:00
return (0);
if (errno != EINTR)
return (seconds); /* best guess */
return (time_remaining.tv_sec +
(time_remaining.tv_nsec != 0)); /* round up */
Temporarily restore old (itimer) sleep variant because new one (nanosleep) breaks Apache httpd badly: his childs died quickly after number of requests (SIGPIPE). To reproduce this bug start gdb /usr/local/sbin/httpd run -X and make some bunch of concurent requests (load the server pages from 3 different places f.e.) After short time httpd dies via SIGPIPE. It never dies with old sleep.c In real life it looks like lots of broken images on the pages or missing pages. Lynx says about Network read error, etc. It seems something wrong in nanosleep signal handling.
1997-05-17 08:32:42 +00:00
}
Add three-tier symbol naming in support of POSIX thread cancellation points. For library functions, the pattern is __sleep() <-- _libc_sleep() <-- sleep(). The arrows represent weak aliases. For system calls, the pattern is _read() <-- _libc_read() <-- read().
2000-01-12 09:23:48 +00:00
Simplify sytem call renaming. Instead of _foo() <-- _libc_foo <-- foo(), just use _foo() <-- foo(). In the case of a libpthread that doesn't do call conversion (such as linuxthreads and our upcoming libpthread), this is adequate. In the case of libc_r, we still need three names, which are now _thread_sys_foo() <-- _foo() <-- foo(). Convert all internal libc usage of: aio_suspend(), close(), fsync(), msync(), nanosleep(), open(), fcntl(), read(), and write() to _foo() instead of foo(). Remove all internal libc usage of: creat(), pause(), sleep(), system(), tcdrain(), wait(), and waitpid(). Make thread cancellation fully POSIX-compliant. Suggested by: deischen
2000-01-27 23:07:25 +00:00
__weak_reference(__sleep, sleep);
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
__weak_reference(__sleep, _sleep);
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