1 | /* Copyright (C) 1991,92,93,1995-1999,2000,2001 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
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3 | |
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4 | The GNU C Library is free software; you can redistribute it and/or |
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5 | modify it under the terms of the GNU Lesser General Public |
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6 | License as published by the Free Software Foundation; either |
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7 | version 2.1 of the License, or (at your option) any later version. |
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8 | |
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9 | The GNU C Library is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | Lesser General Public License for more details. |
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13 | |
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14 | You should have received a copy of the GNU Lesser General Public |
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15 | License along with the GNU C Library; if not, write to the Free |
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16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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17 | 02111-1307 USA. */ |
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18 | |
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19 | #include <errno.h> |
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20 | #include <limits.h> |
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21 | #include <stddef.h> |
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22 | #include <dirent.h> |
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23 | #include <sys/types.h> |
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24 | #include <sys/stat.h> |
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25 | #include <unistd.h> |
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26 | #include <string.h> |
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27 | #include <stdio.h> |
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28 | #include <stdlib.h> |
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29 | #include <machine/weakalias.h> |
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30 | |
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31 | static int getttyname_r (char *buf, size_t buflen, |
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32 | dev_t mydev, ino64_t myino, int save, |
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33 | int *dostat); |
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34 | |
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35 | extern struct dirent64 *__readdir64 (DIR *); |
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36 | |
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37 | static int |
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38 | getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino, |
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39 | int save, int *dostat) |
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40 | { |
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41 | struct stat64 st; |
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42 | DIR *dirstream; |
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43 | struct dirent64 *d; |
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44 | size_t devlen = strlen (buf); |
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45 | |
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46 | dirstream = opendir (buf); |
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47 | if (dirstream == NULL) |
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48 | { |
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49 | *dostat = -1; |
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50 | return errno; |
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51 | } |
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52 | |
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53 | while ((d = __readdir64 (dirstream)) != NULL) |
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54 | { |
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55 | if ((d->d_ino == myino || *dostat) |
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56 | && strcmp (d->d_name, "stdin") |
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57 | && strcmp (d->d_name, "stdout") |
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58 | && strcmp (d->d_name, "stderr")) |
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59 | { |
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60 | size_t needed = strlen (d->d_name) + 1; |
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61 | |
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62 | if (needed > buflen) |
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63 | { |
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64 | *dostat = -1; |
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65 | (void) closedir (dirstream); |
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66 | __set_errno (ERANGE); |
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67 | return ERANGE; |
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68 | } |
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69 | |
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70 | strncpy (buf + devlen, d->d_name, needed); |
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71 | |
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72 | if (stat64 (buf, &st) == 0 |
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73 | #ifdef _STATBUF_ST_RDEV |
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74 | && S_ISCHR (st.st_mode) && st.st_rdev == mydev |
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75 | #else |
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76 | && d->d_ino == myino && st.st_dev == mydev |
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77 | #endif |
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78 | ) |
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79 | { |
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80 | (void) closedir (dirstream); |
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81 | __set_errno (save); |
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82 | return 0; |
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83 | } |
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84 | } |
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85 | } |
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86 | |
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87 | (void) closedir (dirstream); |
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88 | __set_errno (save); |
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89 | /* It is not clear what to return in this case. `isatty' says FD |
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90 | refers to a TTY but no entry in /dev has this inode. */ |
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91 | return ENOTTY; |
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92 | } |
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93 | |
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94 | /* Store at most BUFLEN character of the pathname of the terminal FD is |
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95 | open on in BUF. Return 0 on success, otherwise an error number. */ |
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96 | int |
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97 | __ttyname_r (int fd, char *buf, size_t buflen) |
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98 | { |
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99 | char procname[30]; |
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100 | struct stat64 st, st1; |
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101 | int dostat = 0; |
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102 | int save = errno; |
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103 | int ret; |
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104 | |
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105 | /* Test for the absolute minimal size. This makes life easier inside |
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106 | the loop. */ |
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107 | if (!buf) |
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108 | { |
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109 | __set_errno (EINVAL); |
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110 | return EINVAL; |
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111 | } |
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112 | |
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113 | if (buflen < sizeof ("/dev/pts/")) |
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114 | { |
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115 | __set_errno (ERANGE); |
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116 | return ERANGE; |
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117 | } |
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118 | |
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119 | if (!isatty (fd)) |
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120 | { |
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121 | __set_errno (ENOTTY); |
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122 | return ENOTTY; |
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123 | } |
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124 | |
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125 | /* We try using the /proc filesystem. */ |
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126 | sprintf (procname, "/proc/self/fd/%d", fd); |
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127 | |
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128 | ret = readlink (procname, buf, buflen - 1); |
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129 | if (ret != -1 && buf[0] != '[') |
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130 | { |
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131 | buf[ret] = '\0'; |
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132 | return 0; |
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133 | } |
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134 | if (ret == -1 && errno == ENAMETOOLONG) |
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135 | { |
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136 | __set_errno (ERANGE); |
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137 | return ERANGE; |
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138 | } |
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139 | |
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140 | if (fstat64 (fd, &st) < 0) |
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141 | return errno; |
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142 | |
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143 | /* Prepare the result buffer. */ |
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144 | memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/")); |
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145 | buflen -= sizeof ("/dev/pts/") - 1; |
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146 | |
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147 | if (stat64 (buf, &st1) == 0 && S_ISDIR (st1.st_mode)) |
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148 | { |
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149 | #ifdef _STATBUF_ST_RDEV |
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150 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, |
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151 | &dostat); |
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152 | #else |
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153 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, |
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154 | &dostat); |
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155 | #endif |
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156 | } |
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157 | else |
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158 | { |
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159 | __set_errno (save); |
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160 | ret = ENOENT; |
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161 | } |
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162 | |
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163 | if (ret && dostat != -1) |
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164 | { |
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165 | buf[sizeof ("/dev/") - 1] = '\0'; |
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166 | buflen += sizeof ("pts/") - 1; |
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167 | #ifdef _STATBUF_ST_RDEV |
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168 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, |
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169 | &dostat); |
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170 | #else |
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171 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, |
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172 | &dostat); |
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173 | #endif |
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174 | } |
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175 | |
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176 | if (ret && dostat != -1) |
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177 | { |
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178 | buf[sizeof ("/dev/") - 1] = '\0'; |
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179 | dostat = 1; |
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180 | #ifdef _STATBUF_ST_RDEV |
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181 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, |
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182 | save, &dostat); |
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183 | #else |
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184 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, |
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185 | save, &dostat); |
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186 | #endif |
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187 | } |
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188 | |
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189 | return ret; |
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190 | } |
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191 | |
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192 | weak_alias (__ttyname_r, ttyname_r) |
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