freebsd-skq/lib/libkse/thread/thr_vfork.c

/*
 * $FreeBSD$
 */

#include <unistd.h>
#include "thr_private.h"

int _vfork(void);

__weak_reference(_vfork, vfork);

int
_vfork(void)
{
	return (fork());
}
Add weak definitions for wrapped system calls. In general: _foo - wrapped system call foo - weak definition to _foo and for cancellation points: _foo - wrapped system call __foo - enter cancellation point, call _foo(), leave cancellation point foo - weak definition to __foo Change use of global _thread_run to call a function to get the currently running thread. Make all pthread_foo functions weak definitions to _pthread_foo, where _pthread_foo is the implementation. This allows an application to provide its own pthread functions. Provide slightly different versions of pthread_mutex_lock and pthread_mutex_init so that we can tell the difference between a libc mutex and an application mutex. Threads holding mutexes internal to libc should never be allowed to exit, call signal handlers, or cancel. Approved by: -arch 2001-01-24 13:03:38 +00:00			`/*`
			`* $FreeBSD$`
			`*/`

WARNS=3'ify. 2007-11-30 17:20:29 +00:00			`#include <unistd.h>`
Add compatibility symbol maps. libpthread (.so.1 and .so.2) used LIBTHREAD_1_0 as its version definition, but now needs to define its symbols in the same namespace used by libc. The compatibility hooks allows you to use libraries and binaries built and linked to libpthread before libc was built with symbol versioning. The shims can be removed if libpthread is given a version bump. Reviewed by: davidxu 2006-03-13 00:59:51 +00:00			`#include "thr_private.h"`

WARNS=3'ify. 2007-11-30 17:20:29 +00:00			`int _vfork(void);`

To be consistent, use the __weak_reference macro from <sys/cdefs.h> instead of #pragma weak to create weak definitions. Suggested by: bde 2001-04-10 04:19:21 +00:00			`__weak_reference(_vfork, vfork);`
In libc_r, rename vfork syscall to _thread_sys_vfork and make vfork an alias to fork. It is difficult to do real vfork in libc_r, since almost every operation with file descriptsor changes _thread_fd_table and friends. popen(3) works much better with this change. 1998-09-12 22:03:20 +00:00
			`int`
Add weak definitions for wrapped system calls. In general: _foo - wrapped system call foo - weak definition to _foo and for cancellation points: _foo - wrapped system call __foo - enter cancellation point, call _foo(), leave cancellation point foo - weak definition to __foo Change use of global _thread_run to call a function to get the currently running thread. Make all pthread_foo functions weak definitions to _pthread_foo, where _pthread_foo is the implementation. This allows an application to provide its own pthread functions. Provide slightly different versions of pthread_mutex_lock and pthread_mutex_init so that we can tell the difference between a libc mutex and an application mutex. Threads holding mutexes internal to libc should never be allowed to exit, call signal handlers, or cancel. Approved by: -arch 2001-01-24 13:03:38 +00:00			`_vfork(void)`
In libc_r, rename vfork syscall to _thread_sys_vfork and make vfork an alias to fork. It is difficult to do real vfork in libc_r, since almost every operation with file descriptsor changes _thread_fd_table and friends. popen(3) works much better with this change. 1998-09-12 22:03:20 +00:00			`{`
			`return (fork());`
			`}`