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108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Copyright (c) 2000, Todd C. Miller. All rights reserved.
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* Copyright (c) 1996, Jason Downs. All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* 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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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdio.h>
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#include <string.h>
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#include <pthread.h>
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#include "util.h"
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/*
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* opendev(3) is an inherently non-thread-safe API, since
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* it returns a buffer to global storage. However we can
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* at least make sure the storage allocation is thread safe
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* and does not leak memory in case of simultaneous
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* initialization
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*/
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static pthread_once_t opendev_namebuf_once = PTHREAD_ONCE_INIT;
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static char *namebuf = NULL;
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static void opendev_namebuf_init(void);
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int
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opendev(path, oflags, dflags, realpath)
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char *path;
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int oflags;
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int dflags;
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char **realpath;
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{
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int fd;
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char *slash, *prefix;
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/* Initial state */
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if (realpath)
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*realpath = path;
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fd = -1;
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errno = ENOENT;
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if (pthread_once(&opendev_namebuf_once,
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opendev_namebuf_init)
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|| !namebuf) {
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errno = ENOMEM;
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return -1;
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}
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if (dflags & OPENDEV_BLCK)
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prefix = ""; /* block device */
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else
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prefix = "r"; /* character device */
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if ((slash = strchr(path, '/')))
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fd = open(path, oflags);
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else if (dflags & OPENDEV_PART) {
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if (snprintf(namebuf, PATH_MAX, "%s%s%s",
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_PATH_DEV, prefix, path) < PATH_MAX) {
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char *slice;
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while ((slice = strrchr(namebuf, 's')) &&
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isdigit(*(slice-1))) *slice = '\0';
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fd = open(namebuf, oflags);
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if (realpath)
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*realpath = namebuf;
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} else
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errno = ENAMETOOLONG;
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}
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if (!slash && fd == -1 && errno == ENOENT) {
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if (snprintf(namebuf, PATH_MAX, "%s%s%s",
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_PATH_DEV, prefix, path) < PATH_MAX) {
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fd = open(namebuf, oflags);
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if (realpath)
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*realpath = namebuf;
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} else
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errno = ENAMETOOLONG;
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}
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return (fd);
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}
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static void opendev_namebuf_init(void)
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{
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namebuf = malloc(PATH_MAX);
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}
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