source: rtems/cpukit/libcsupport/src/rtems_mkdir.c @ b81c8a69

/**
 * @file
 *
 * @ingroup LibIO
 *
 * @brief rtems_mkdir() implementation.
 *
 * The implementation is based on FreeBSD 'bin/mkdir/mkdir.c' revision 163213.
 */

/*-
 * Copyright (c) 2010 embedded brains GmbH.
 *
 * Copyright (c) 1983, 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/stat.h>

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <rtems/libio.h>

/*
 * Returns 1 if a directory has been created,
 * 2 if it already existed, and 0 on failure.
 */
static int
build(char *path, mode_t omode)
{
        struct stat sb;
        mode_t numask, oumask;
        int first, last, retval;
        char *p;

        p = path;
        oumask = 0;
        retval = 1;
        if (p[0] == '/')                /* Skip leading '/'. */
                ++p;
        for (first = 1, last = 0; !last ; ++p) {
                if (p[0] == '\0')
                        last = 1;
                else if (p[0] != '/')
                        continue;
                *p = '\0';
                if (!last && p[1] == '\0')
                        last = 1;
                if (first) {
                        /*
                         * POSIX 1003.2:
                         * For each dir operand that does not name an existing
                         * directory, effects equivalent to those caused by the
                         * following command shall occcur:
                         *
                         * mkdir -p -m $(umask -S),u+wx $(dirname dir) &&
                         *    mkdir [-m mode] dir
                         *
                         * We change the user's umask and then restore it,
                         * instead of doing chmod's.
                         */
                        oumask = umask(0);
                        numask = oumask & ~(S_IWUSR | S_IXUSR);
                        (void)umask(numask);
                        first = 0;
                }
                if (last)
                        (void)umask(oumask);
                if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0) {
                        if (errno == EEXIST || errno == EISDIR) {
                                if (stat(path, &sb) < 0) {
                                        retval = 0;
                                        break;
                                } else if (!S_ISDIR(sb.st_mode)) {
                                        if (last)
                                                errno = EEXIST;
                                        else
                                                errno = ENOTDIR;
                                        retval = 0;
                                        break;
                                }
                                if (last)
                                        retval = 2;
                        } else {
                                retval = 0;
                                break;
                        }
                }
                if (!last)
                    *p = '/';
        }
        if (!first && !last)
                (void)umask(oumask);
        return (retval);
}

int
rtems_mkdir(const char *path, mode_t mode)
{
        int success = 0;
        char *dup_path = strdup(path);

        if (dup_path != NULL) {
                success = build(dup_path, mode);
                free(dup_path);
        }

        return success != 0 ? 0 : -1;
}