/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "lint.h"
#include "file64.h"
#include <sys/types.h>
#include <stdio.h>
#include <mtlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <thread.h>
#include <synch.h>
#include <stdlib.h>
#include <errno.h>
#include "stdiom.h"
#include "xpg6.h"
/* Final argument to _endopen depends on build environment */
#define LARGE_OPEN (_FILE_OFFSET_BITS == 64)
FILE *
fopen(const char *name, const char *type) /* open name, return new stream */
{
FILE *iop;
FILE *rc;
iop = _findiop();
/*
* Note that iop is not locked here, since no other thread could
* possibly call _endopen with the same iop at this point.
*/
rc = _endopen(name, type, iop, LARGE_OPEN);
if (rc == NULL && iop != NULL)
iop->_flag = 0; /* release iop */
return (rc);
}
static FILE *
_freopen_null(const char *type, FILE *iop)
{
char plus, mode;
int oflag, nflag, fd, accmode;
mbstate_t *mb;
if (iop == NULL || iop->_flag == 0) {
errno = EBADF;
return (NULL);
}
if (!(iop->_flag & _IONBF) && (iop->_flag & (_IOWRT | _IOREAD | _IORW)))
(void) _fflush_u(iop);
if (iop->_flag & _IOMYBUF) {
free((char *)iop->_base - PUSHBACK);
}
iop->_base = NULL;
iop->_ptr = NULL;
/*
* Clear stream orientation, clear stream encoding rule, and set
* stream's mbstate_t object to describe an initial conversion state.
*/
mb = _getmbstate(iop);
if (mb != NULL)
(void) memset(mb, 0, sizeof (mbstate_t));
iop->_cnt = 0;
_setorientation(iop, _NO_MODE);
fd = FILENO(iop);
mode = type[0];
if (mode != 'r' && mode != 'w' && mode != 'a') {
errno = EINVAL;
goto errret;
}
if ((oflag = fcntl(fd, F_GETFL)) == -1)
goto errret;
if ((plus = type[1]) == 'b')
plus = type[2];
/*
* Because the filename has not been specified, the underlying file
* will not be closed and reopened. The access modes of an open
* file descriptor can't be changed via fcntl(). When '+' is
* specified, the old access mode needs to be O_RDWR. When 'r' is
* specified, the old access mode needs to be O_RDONLY or O_RDWR.
* When 'a' or 'w' is specified, the old access mode needs to be
* O_WRONLY or O_RDWR. Otherwise, fail with EBADF, indicating that
* the underlying file descriptor was not opened with a mode that
* would allow the stream to do successful I/O with the requested mode.
*/
accmode = oflag & O_ACCMODE;
if ((accmode == O_RDONLY && (mode != 'r' || plus == '+')) ||
(accmode == O_WRONLY && (mode == 'r' || plus == '+'))) {
(void) close(fd);
errno = EBADF;
goto errret_noclose;
}
#ifdef _LP64
iop->_flag &= ~0377; /* clear lower 8-bits */
if (mode == 'r') {
iop->_flag |= _IOREAD;
nflag = oflag & ~O_APPEND;
} else if (mode == 'w') {
iop->_flag |= _IOWRT;
nflag = oflag & ~O_APPEND;
} else {
iop->_flag |= _IOWRT;
nflag = oflag | O_APPEND;
}
if (plus == '+') {
iop->_flag = (iop->_flag & ~(_IOREAD | _IOWRT)) | _IORW;
}
#else
if (mode == 'r') {
iop->_flag = _IOREAD;
nflag = oflag & ~O_APPEND;
} else if (mode == 'w') {
iop->_flag = _IOWRT;
nflag = oflag & ~O_APPEND;
} else {
iop->_flag = _IOWRT;
nflag = oflag | O_APPEND;
}
if (plus == '+') {
iop->_flag = _IORW;
}
#endif
/*
* Change mode of underlying fd as much as possible without closing
* and reopening it. Ignore truncate failures, eg. with stdout.
*/
if (mode == 'w')
(void) ftruncate64(fd, (off64_t)0);
if (fcntl(fd, F_SETFL, nflag) == -1)
goto errret;
/* ignore seek failures, eg. with pipes */
(void) lseek64(fd, (off64_t)0, SEEK_SET);
return (iop);
errret:
if (errno != EBADF)
(void) close(fd);
errret_noclose:
iop->_flag = 0; /* release iop */
return (NULL);
}
FILE *
freopen(const char *name, const char *type, FILE *iop)
{
FILE *rc;
rmutex_t *lk;
if (name == NULL && __xpg6 & _C99SUSv3_freopen_NULL_filename) {
/*
* XPG6: If name is a null pointer, freopen will attempt to
* change the mode of the stream to that specified by type.
*/
FLOCKFILE(lk, iop);
rc = _freopen_null(type, iop);
FUNLOCKFILE(lk);
return (rc);
}
/*
* there may be concurrent calls to reopen the same stream - need
* to make freopen() atomic
*/
FLOCKFILE(lk, iop);
/*
* new function to do everything that fclose() does, except
* to release the iop - this cannot yet be released since
* _endopen() is yet to be called on this iop
*/
(void) close_fd(iop);
rc = _endopen(name, type, iop, LARGE_OPEN);
if (rc == NULL)
iop->_flag = 0; /* release iop */
FUNLOCKFILE(lk);
return (rc);
}