freebsd/lib/libc_r/uthread/uthread_fchflags.c

/*
 * David Leonard <d@openbsd.org>, 1999. Public Domain.
 *
 * $OpenBSD: uthread_fchflags.c,v 1.1 1999/01/08 05:42:18 d Exp $
 * $FreeBSD$
 */

#include <sys/stat.h>
#include <unistd.h>
#include <pthread.h>
#include "pthread_private.h"

#pragma weak	fchflags=_fchflags
int
_fchflags(int fd, u_long flags)
{
	int             ret;

	if ((ret = _FD_LOCK(fd, FD_WRITE, NULL)) == 0) {
		ret = __sys_fchflags(fd, flags);
		_FD_UNLOCK(fd, FD_WRITE);
	}
	return (ret);
}
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone 1999-11-28 05:38:13 +00:00			`/*`
			`* David Leonard <d@openbsd.org>, 1999. Public Domain.`
			`*`
			`* $OpenBSD: uthread_fchflags.c,v 1.1 1999/01/08 05:42:18 d Exp $`
			`* $FreeBSD$`
			`*/`

			`#include <sys/stat.h>`
			`#include <unistd.h>`
			`#include <pthread.h>`
			`#include "pthread_private.h"`

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			`#pragma weak fchflags=_fchflags`
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone 1999-11-28 05:38:13 +00:00			`int`
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			`_fchflags(int fd, u_long flags)`
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone 1999-11-28 05:38:13 +00:00			`{`
			`int ret;`

			`if ((ret = _FD_LOCK(fd, FD_WRITE, NULL)) == 0) {`
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			`ret = __sys_fchflags(fd, flags);`
add pthread_cancel, obtained from OpenBSD. eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone 1999-11-28 05:38:13 +00:00			`_FD_UNLOCK(fd, FD_WRITE);`
			`}`
			`return (ret);`
			`}`