/**
* @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 & Co. KG
*
* 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.
*/
#ifdef 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;
}
