1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup LibIO |
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5 | * |
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6 | * @brief rtems_mkdir() implementation. |
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7 | * |
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8 | * The implementation is based on FreeBSD 'bin/mkdir/mkdir.c' revision 163213. |
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9 | */ |
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10 | |
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11 | /*- |
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12 | * Copyright (c) 2010 embedded brains GmbH. |
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13 | * |
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14 | * Copyright (c) 1983, 1992, 1993 |
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15 | * The Regents of the University of California. All rights reserved. |
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16 | * |
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17 | * Redistribution and use in source and binary forms, with or without |
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18 | * modification, are permitted provided that the following conditions |
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19 | * are met: |
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20 | * 1. Redistributions of source code must retain the above copyright |
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21 | * notice, this list of conditions and the following disclaimer. |
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22 | * 2. Redistributions in binary form must reproduce the above copyright |
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23 | * notice, this list of conditions and the following disclaimer in the |
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24 | * documentation and/or other materials provided with the distribution. |
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25 | * 4. Neither the name of the University nor the names of its contributors |
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26 | * may be used to endorse or promote products derived from this software |
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27 | * without specific prior written permission. |
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28 | * |
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29 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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30 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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33 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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34 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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35 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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36 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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38 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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39 | * SUCH DAMAGE. |
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40 | */ |
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41 | |
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42 | #if HAVE_CONFIG_H |
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43 | #include "config.h" |
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44 | #endif |
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45 | |
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46 | #include <sys/types.h> |
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47 | #include <sys/stat.h> |
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48 | |
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49 | #include <errno.h> |
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50 | #include <stdlib.h> |
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51 | #include <string.h> |
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52 | #include <unistd.h> |
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53 | |
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54 | #include <rtems/libio.h> |
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55 | |
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56 | /* |
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57 | * Returns 1 if a directory has been created, |
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58 | * 2 if it already existed, and 0 on failure. |
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59 | */ |
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60 | static int |
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61 | build(char *path, mode_t omode) |
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62 | { |
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63 | struct stat sb; |
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64 | mode_t numask, oumask; |
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65 | int first, last, retval; |
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66 | char *p; |
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67 | |
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68 | p = path; |
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69 | oumask = 0; |
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70 | retval = 1; |
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71 | if (p[0] == '/') /* Skip leading '/'. */ |
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72 | ++p; |
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73 | for (first = 1, last = 0; !last ; ++p) { |
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74 | if (p[0] == '\0') |
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75 | last = 1; |
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76 | else if (p[0] != '/') |
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77 | continue; |
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78 | *p = '\0'; |
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79 | if (!last && p[1] == '\0') |
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80 | last = 1; |
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81 | if (first) { |
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82 | /* |
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83 | * POSIX 1003.2: |
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84 | * For each dir operand that does not name an existing |
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85 | * directory, effects equivalent to those caused by the |
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86 | * following command shall occcur: |
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87 | * |
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88 | * mkdir -p -m $(umask -S),u+wx $(dirname dir) && |
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89 | * mkdir [-m mode] dir |
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90 | * |
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91 | * We change the user's umask and then restore it, |
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92 | * instead of doing chmod's. |
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93 | */ |
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94 | oumask = umask(0); |
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95 | numask = oumask & ~(S_IWUSR | S_IXUSR); |
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96 | (void)umask(numask); |
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97 | first = 0; |
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98 | } |
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99 | if (last) |
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100 | (void)umask(oumask); |
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101 | if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0) { |
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102 | if (errno == EEXIST || errno == EISDIR) { |
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103 | if (stat(path, &sb) < 0) { |
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104 | retval = 0; |
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105 | break; |
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106 | } else if (!S_ISDIR(sb.st_mode)) { |
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107 | if (last) |
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108 | errno = EEXIST; |
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109 | else |
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110 | errno = ENOTDIR; |
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111 | retval = 0; |
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112 | break; |
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113 | } |
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114 | if (last) |
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115 | retval = 2; |
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116 | } else { |
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117 | retval = 0; |
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118 | break; |
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119 | } |
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120 | } |
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121 | if (!last) |
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122 | *p = '/'; |
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123 | } |
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124 | if (!first && !last) |
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125 | (void)umask(oumask); |
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126 | return (retval); |
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127 | } |
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128 | |
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129 | int |
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130 | rtems_mkdir(const char *path, mode_t mode) |
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131 | { |
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132 | int success = 0; |
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133 | char *dup_path = strdup(path); |
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134 | |
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135 | if (dup_path != NULL) { |
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136 | success = build(dup_path, mode); |
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137 | free(dup_path); |
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138 | } |
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139 | |
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140 | return success != 0 ? 0 : -1; |
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141 | } |
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