ltt-sessiond/utils.c

   1 /*
   2  * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28
  29 #include "utils.h"
  30
  31 /*
  32  *  get_home_dir
  33  *
  34  *  Return pointer to home directory path using the env variable HOME.
  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  *  mkdir_recursive
  44  *
  45  *  Create recursively directory using the FULL path.
  46  */
  47 int mkdir_recursive(const char *path, mode_t mode)
  48 {
  49         int ret;
  50         char *p, tmp[PATH_MAX];
  51         size_t len;
  52         mode_t old_umask;
  53
  54         ret = snprintf(tmp, sizeof(tmp), "%s", path);
  55         if (ret < 0) {
  56                 perror("snprintf mkdir");
  57                 goto error;
  58         }
  59
  60         len = ret;
  61         if (tmp[len - 1] == '/') {
  62                 tmp[len - 1] = 0;
  63         }
  64
  65         old_umask = umask(0);
  66         for (p = tmp + 1; *p; p++) {
  67                 if (*p == '/') {
  68                         *p = 0;
  69                         ret = mkdir(tmp, mode);
  70                         if (ret < 0) {
  71                                 if (!(errno == EEXIST)) {
  72                                         perror("mkdir recursive");
  73                                         ret = errno;
  74                                         goto umask_error;
  75                                 }
  76                         }
  77                         *p = '/';
  78                 }
  79         }
  80
  81         ret = mkdir(tmp, mode);
  82         if (ret < 0) {
  83                 ret = errno;
  84         }
  85
  86 umask_error:
  87         umask(old_umask);
  88 error:
  89         return ret;
  90 }