ltt-sessiond/utils.c

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; only version 2
   8  * of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  */
  19
  20 #define _GNU_SOURCE
  21 #include <errno.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <unistd.h>
  29
  30 #include "utils.h"
  31
  32 /*
  33  * Return pointer to home directory path using the env variable HOME.
  34  *
  35  * No home, NULL is returned.
  36  */
  37 const char *get_home_dir(void)
  38 {
  39         return ((const char *) getenv("HOME"));
  40 }
  41
  42 /*
  43  * Create recursively directory using the FULL path.
  44  */
  45 int mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid)
  46 {
  47         int ret;
  48         char *p, tmp[PATH_MAX];
  49         size_t len;
  50         mode_t old_umask;
  51
  52         ret = snprintf(tmp, sizeof(tmp), "%s", path);
  53         if (ret < 0) {
  54                 perror("snprintf mkdir");
  55                 goto error;
  56         }
  57
  58         len = ret;
  59         if (tmp[len - 1] == '/') {
  60                 tmp[len - 1] = 0;
  61         }
  62
  63         old_umask = umask(0);
  64         for (p = tmp + 1; *p; p++) {
  65                 if (*p == '/') {
  66                         *p = 0;
  67                         ret = mkdir(tmp, mode);
  68                         if (ret < 0) {
  69                                 if (!(errno == EEXIST)) {
  70                                         perror("mkdir recursive");
  71                                         ret = -errno;
  72                                         goto umask_error;
  73                                 }
  74                         } else if (ret == 0) {
  75                                 /*
  76                                  * We created the directory. Set its ownership to the
  77                                  * user/group specified.
  78                                  */
  79                                 ret = chown(tmp, uid, gid);
  80                                 if (ret < 0) {
  81                                         perror("chown in mkdir recursive");
  82                                         ret = -errno;
  83                                         goto umask_error;
  84                                 }
  85                         }
  86                         *p = '/';
  87                 }
  88         }
  89
  90         ret = mkdir(tmp, mode);
  91         if (ret < 0) {
  92                 ret = -errno;
  93         } else if (ret == 0) {
  94                 /*
  95                  * We created the directory. Set its ownership to the user/group
  96                  * specified.
  97                  */
  98                 ret = chown(tmp, uid, gid);
  99                 if (ret < 0) {
 100                         perror("chown in mkdir recursive");
 101                         ret = -errno;
 102                         goto umask_error;
 103                 }
 104         }
 105
 106 umask_error:
 107         umask(old_umask);
 108 error:
 109         return ret;
 110 }