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/* $OpenBSD: uthread_dup2.c,v 1.8 2006/09/22 19:04:33 kurt Exp $ */
/* PUBLIC DOMAIN <marc@snafu.org> */
#include <errno.h>
#include <unistd.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
int
dup2(int fd, int newfd)
{
int ret;
int saved_errno;
int newfd_opened;
if (newfd >= 0 && newfd < _thread_dtablesize &&
newfd != _thread_kern_pipe[0] && newfd != _thread_kern_pipe[1]) {
ret = _FD_LOCK(fd, FD_RDWR, NULL);
if (ret == 0) {
newfd_opened = _thread_fd_table[newfd] != NULL;
if (!newfd_opened ||
(ret = _FD_LOCK(newfd, FD_RDWR, NULL)) == 0) {
/*
* If newfd was open then drop reference
* and reset flags if needed.
*/
if (newfd_opened)
_thread_fs_flags_replace(newfd, NULL);
ret = _thread_sys_dup2(fd, newfd);
if (ret != -1)
ret = _thread_fd_table_init(newfd,
_thread_fd_table[fd]->status_flags);
/*
* If the dup2 or the _thread_fd_table_init
* failed we've already removed the status
* flags, so finish closing newfd. Return
* the current errno in case the sys_close
* fails too.
*/
if (ret == -1) {
saved_errno = errno;
if (newfd_opened)
_thread_fd_table_remove(newfd);
_thread_sys_close(newfd);
errno = saved_errno ;
} else if (newfd_opened) {
_FD_UNLOCK(newfd, FD_RDWR);
}
}
_FD_UNLOCK(fd, FD_RDWR);
}
} else {
errno = EBADF;
ret = -1;
}
return (ret);
}
#endif
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