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5ba651f004
This commit adds a new mode option 'e' that must follow any 'b', '+' and/or 'x' options. C11 is clear about the 'x' needing to follow 'b' and/or '+' and that is what we implement; therefore, require a strict position for 'e' as well. For freopen() with a non-NULL path argument and fopen(), the close-on-exec flag is set iff the 'e' mode option is specified. For freopen() with a NULL path argument and fdopen(), the close-on-exec flag is turned on if the 'e' mode option is specified and remains unchanged otherwise. Although the same behaviour for fopen() can be obtained by open(O_CLOEXEC) and fdopen(), this needlessly complicates the calling code. Apart from the ordering requirement, the new option matches glibc. PR: kern/169320
115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)flags.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/file.h>
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#include <stdio.h>
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#include <errno.h>
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#include "local.h"
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/*
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* Return the (stdio) flags for a given mode. Store the flags
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* to be passed to an _open() syscall through *optr.
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* Return 0 on error.
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*/
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int
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__sflags(mode, optr)
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const char *mode;
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int *optr;
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{
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int ret, m, o;
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switch (*mode++) {
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case 'r': /* open for reading */
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ret = __SRD;
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m = O_RDONLY;
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o = 0;
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break;
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case 'w': /* open for writing */
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ret = __SWR;
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m = O_WRONLY;
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o = O_CREAT | O_TRUNC;
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break;
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case 'a': /* open for appending */
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ret = __SWR;
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m = O_WRONLY;
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o = O_CREAT | O_APPEND;
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break;
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default: /* illegal mode */
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errno = EINVAL;
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return (0);
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}
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/* 'b' (binary) is ignored */
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if (*mode == 'b')
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mode++;
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/* [rwa][b]\+ means read and write */
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if (*mode == '+') {
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mode++;
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ret = __SRW;
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m = O_RDWR;
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}
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/* 'b' (binary) can appear here, too -- and is ignored again */
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if (*mode == 'b')
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mode++;
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/* 'x' means exclusive (fail if the file exists) */
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if (*mode == 'x') {
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mode++;
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if (m == O_RDONLY) {
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errno = EINVAL;
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return (0);
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}
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o |= O_EXCL;
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}
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/* set close-on-exec */
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if (*mode == 'e')
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o |= O_CLOEXEC;
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*optr = m | o;
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return (ret);
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}
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