1 files changed, 232 insertions, 0 deletions
diff --git a/usr/src/lib/libc/port/stdio/fopen.c b/usr/src/lib/libc/port/stdio/fopen.c
new file mode 100644
index 0000000000..24ad5f0966
--- /dev/null
+++ b/usr/src/lib/libc/port/stdio/fopen.c
@@ -0,0 +1,232 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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 2004 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);
+}