Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/tempname.c @ 9928:9a02133ad731
Add tentative support for Linux libc5.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Thu, 17 Apr 2008 02:01:23 +0200 |
| parents | bbbbbf4cd1c5 |
| children | 52791eb62094 |
| rev | line source |
|---|---|
| 4020 | 1 /* tempname.c - generate the name of a temporary file. |
| 3192 | 2 |
| 4020 | 3 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
|
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4 2000, 2001, 2002, 2003, 2005, 2006, 2007 Free Software Foundation, |
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5 Inc. |
| 3192 | 6 |
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7 This program is free software: you can redistribute it and/or modify |
| 4020 | 8 it under the terms of the GNU General Public License as published by |
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9 the Free Software Foundation; either version 3 of the License, or |
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10 (at your option) any later version. |
| 3192 | 11 |
| 4020 | 12 This program is distributed in the hope that it will be useful, |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 GNU General Public License for more details. | |
| 16 | |
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17 You should have received a copy of the GNU General Public License |
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18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 3192 | 19 |
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20 /* Extracted from glibc sysdeps/posix/tempname.c. See also tmpdir.c. */ |
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21 |
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22 #if !_LIBC |
| 3192 | 23 # include <config.h> |
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24 # include "tempname.h" |
| 3192 | 25 #endif |
| 26 | |
| 27 #include <sys/types.h> | |
| 28 #include <assert.h> | |
| 29 | |
| 30 #include <errno.h> | |
| 31 #ifndef __set_errno | |
| 32 # define __set_errno(Val) errno = (Val) | |
| 33 #endif | |
| 34 | |
| 35 #include <stdio.h> | |
| 36 #ifndef P_tmpdir | |
| 37 # define P_tmpdir "/tmp" | |
| 38 #endif | |
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39 #ifndef TMP_MAX |
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40 # define TMP_MAX 238328 |
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41 #endif |
| 3192 | 42 #ifndef __GT_FILE |
| 43 # define __GT_FILE 0 | |
| 44 # define __GT_BIGFILE 1 | |
| 45 # define __GT_DIR 2 | |
| 46 # define __GT_NOCREATE 3 | |
| 47 #endif | |
| 48 | |
| 4333 | 49 #include <stddef.h> |
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50 #include <stdlib.h> |
| 4691 | 51 #include <string.h> |
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52 |
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53 #include <fcntl.h> |
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54 #include <sys/time.h> |
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55 #include <stdint.h> |
| 6275 | 56 #include <unistd.h> |
| 3192 | 57 |
| 58 #include <sys/stat.h> | |
| 59 | |
| 60 #if _LIBC | |
| 61 # define struct_stat64 struct stat64 | |
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62 # define small_open __open |
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63 # define large_open __open64 |
| 3192 | 64 #else |
| 65 # define struct_stat64 struct stat | |
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66 # define small_open open |
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67 # define large_open open |
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68 # define __gen_tempname gen_tempname |
| 3192 | 69 # define __getpid getpid |
| 70 # define __gettimeofday gettimeofday | |
| 71 # define __mkdir mkdir | |
| 5907 | 72 # define __lxstat64(version, file, buf) lstat (file, buf) |
| 73 # define __xstat64(version, file, buf) stat (file, buf) | |
| 3192 | 74 #endif |
| 75 | |
| 76 #if ! (HAVE___SECURE_GETENV || _LIBC) | |
| 77 # define __secure_getenv getenv | |
| 78 #endif | |
| 79 | |
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80 #ifdef _LIBC |
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81 # include <hp-timing.h> |
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82 # if HP_TIMING_AVAIL |
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83 # define RANDOM_BITS(Var) \ |
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84 if (__builtin_expect (value == UINT64_C (0), 0)) \ |
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85 { \ |
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86 /* If this is the first time this function is used initialize \ |
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87 the variable we accumulate the value in to some somewhat \ |
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88 random value. If we'd not do this programs at startup time \ |
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89 might have a reduced set of possible names, at least on slow \ |
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90 machines. */ \ |
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91 struct timeval tv; \ |
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92 __gettimeofday (&tv, NULL); \ |
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93 value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \ |
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94 } \ |
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95 HP_TIMING_NOW (Var) |
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96 # endif |
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97 #endif |
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98 |
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99 /* Use the widest available unsigned type if uint64_t is not |
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100 available. The algorithm below extracts a number less than 62**6 |
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101 (approximately 2**35.725) from uint64_t, so ancient hosts where |
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102 uintmax_t is only 32 bits lose about 3.725 bits of randomness, |
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103 which is better than not having mkstemp at all. */ |
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104 #if !defined UINT64_MAX && !defined uint64_t |
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105 # define uint64_t uintmax_t |
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106 #endif |
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107 |
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108 #if _LIBC |
| 3192 | 109 /* Return nonzero if DIR is an existent directory. */ |
| 110 static int | |
| 111 direxists (const char *dir) | |
| 112 { | |
| 113 struct_stat64 buf; | |
| 114 return __xstat64 (_STAT_VER, dir, &buf) == 0 && S_ISDIR (buf.st_mode); | |
| 115 } | |
| 116 | |
| 117 /* Path search algorithm, for tmpnam, tmpfile, etc. If DIR is | |
| 118 non-null and exists, uses it; otherwise uses the first of $TMPDIR, | |
| 119 P_tmpdir, /tmp that exists. Copies into TMPL a template suitable | |
| 120 for use with mk[s]temp. Will fail (-1) if DIR is non-null and | |
| 121 doesn't exist, none of the searched dirs exists, or there's not | |
| 122 enough space in TMPL. */ | |
| 123 int | |
| 124 __path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx, | |
| 125 int try_tmpdir) | |
| 126 { | |
| 127 const char *d; | |
| 128 size_t dlen, plen; | |
| 129 | |
| 130 if (!pfx || !pfx[0]) | |
| 131 { | |
| 132 pfx = "file"; | |
| 133 plen = 4; | |
| 134 } | |
| 135 else | |
| 136 { | |
| 137 plen = strlen (pfx); | |
| 138 if (plen > 5) | |
| 139 plen = 5; | |
| 140 } | |
| 141 | |
| 142 if (try_tmpdir) | |
| 143 { | |
| 144 d = __secure_getenv ("TMPDIR"); | |
| 145 if (d != NULL && direxists (d)) | |
| 146 dir = d; | |
| 147 else if (dir != NULL && direxists (dir)) | |
| 148 /* nothing */ ; | |
| 149 else | |
| 150 dir = NULL; | |
| 151 } | |
| 152 if (dir == NULL) | |
| 153 { | |
| 154 if (direxists (P_tmpdir)) | |
| 155 dir = P_tmpdir; | |
| 156 else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp")) | |
| 157 dir = "/tmp"; | |
| 158 else | |
| 159 { | |
| 160 __set_errno (ENOENT); | |
| 161 return -1; | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 dlen = strlen (dir); | |
| 166 while (dlen > 1 && dir[dlen - 1] == '/') | |
| 167 dlen--; /* remove trailing slashes */ | |
| 168 | |
| 169 /* check we have room for "${dir}/${pfx}XXXXXX\0" */ | |
| 170 if (tmpl_len < dlen + 1 + plen + 6 + 1) | |
| 171 { | |
| 172 __set_errno (EINVAL); | |
| 173 return -1; | |
| 174 } | |
| 175 | |
| 176 sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx); | |
| 177 return 0; | |
| 178 } | |
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179 #endif /* _LIBC */ |
| 3192 | 180 |
| 5907 | 181 /* These are the characters used in temporary file names. */ |
| 3192 | 182 static const char letters[] = |
| 183 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; | |
| 184 | |
| 185 /* Generate a temporary file name based on TMPL. TMPL must match the | |
| 186 rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed | |
| 187 does not exist at the time of the call to __gen_tempname. TMPL is | |
| 188 overwritten with the result. | |
| 189 | |
| 190 KIND may be one of: | |
| 191 __GT_NOCREATE: simply verify that the name does not exist | |
| 192 at the time of the call. | |
| 193 __GT_FILE: create the file using open(O_CREAT|O_EXCL) | |
| 194 and return a read-write fd. The file is mode 0600. | |
| 195 __GT_BIGFILE: same as __GT_FILE but use open64(). | |
| 196 __GT_DIR: create a directory, which will be mode 0700. | |
| 197 | |
| 198 We use a clever algorithm to get hard-to-predict names. */ | |
| 199 int | |
| 200 __gen_tempname (char *tmpl, int kind) | |
| 201 { | |
| 202 int len; | |
| 203 char *XXXXXX; | |
| 204 static uint64_t value; | |
| 205 uint64_t random_time_bits; | |
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206 unsigned int count; |
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207 int fd = -1; |
| 3192 | 208 int save_errno = errno; |
| 209 struct_stat64 st; | |
| 210 | |
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211 /* A lower bound on the number of temporary files to attempt to |
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212 generate. The maximum total number of temporary file names that |
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213 can exist for a given template is 62**6. It should never be |
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214 necessary to try all these combinations. Instead if a reasonable |
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215 number of names is tried (we define reasonable as 62**3) fail to |
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216 give the system administrator the chance to remove the problems. */ |
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217 #define ATTEMPTS_MIN (62 * 62 * 62) |
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218 |
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219 /* The number of times to attempt to generate a temporary file. To |
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220 conform to POSIX, this must be no smaller than TMP_MAX. */ |
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221 #if ATTEMPTS_MIN < TMP_MAX |
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222 unsigned int attempts = TMP_MAX; |
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223 #else |
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224 unsigned int attempts = ATTEMPTS_MIN; |
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225 #endif |
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226 |
| 3192 | 227 len = strlen (tmpl); |
| 228 if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX")) | |
| 229 { | |
| 230 __set_errno (EINVAL); | |
| 231 return -1; | |
| 232 } | |
| 233 | |
| 234 /* This is where the Xs start. */ | |
| 235 XXXXXX = &tmpl[len - 6]; | |
| 236 | |
| 237 /* Get some more or less random data. */ | |
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238 #ifdef RANDOM_BITS |
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239 RANDOM_BITS (random_time_bits); |
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240 #else |
| 3192 | 241 { |
| 242 struct timeval tv; | |
| 243 __gettimeofday (&tv, NULL); | |
| 244 random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; | |
| 245 } | |
| 246 #endif | |
| 247 value += random_time_bits ^ __getpid (); | |
| 248 | |
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249 for (count = 0; count < attempts; value += 7777, ++count) |
| 3192 | 250 { |
| 251 uint64_t v = value; | |
| 252 | |
| 253 /* Fill in the random bits. */ | |
| 254 XXXXXX[0] = letters[v % 62]; | |
| 255 v /= 62; | |
| 256 XXXXXX[1] = letters[v % 62]; | |
| 257 v /= 62; | |
| 258 XXXXXX[2] = letters[v % 62]; | |
| 259 v /= 62; | |
| 260 XXXXXX[3] = letters[v % 62]; | |
| 261 v /= 62; | |
| 262 XXXXXX[4] = letters[v % 62]; | |
| 263 v /= 62; | |
| 264 XXXXXX[5] = letters[v % 62]; | |
| 265 | |
| 266 switch (kind) | |
| 267 { | |
| 268 case __GT_FILE: | |
|
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* tempname.c (small_open, large_open): New macros.
Paul Eggert <eggert@cs.ucla.edu>
parents:
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diff
changeset
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269 fd = small_open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR); |
| 3192 | 270 break; |
| 271 | |
| 272 case __GT_BIGFILE: | |
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* tempname.c (small_open, large_open): New macros.
Paul Eggert <eggert@cs.ucla.edu>
parents:
6275
diff
changeset
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273 fd = large_open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR); |
| 3192 | 274 break; |
| 275 | |
| 276 case __GT_DIR: | |
| 277 fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR); | |
| 278 break; | |
| 279 | |
| 280 case __GT_NOCREATE: | |
| 281 /* This case is backward from the other three. __gen_tempname | |
| 282 succeeds if __xstat fails because the name does not exist. | |
| 283 Note the continue to bypass the common logic at the bottom | |
| 284 of the loop. */ | |
| 285 if (__lxstat64 (_STAT_VER, tmpl, &st) < 0) | |
| 286 { | |
| 287 if (errno == ENOENT) | |
| 288 { | |
| 289 __set_errno (save_errno); | |
| 290 return 0; | |
| 291 } | |
| 292 else | |
| 293 /* Give up now. */ | |
| 294 return -1; | |
| 295 } | |
| 296 continue; | |
| 297 | |
| 298 default: | |
| 299 assert (! "invalid KIND in __gen_tempname"); | |
| 300 } | |
| 301 | |
| 302 if (fd >= 0) | |
| 303 { | |
| 304 __set_errno (save_errno); | |
| 305 return fd; | |
| 306 } | |
| 307 else if (errno != EEXIST) | |
| 308 return -1; | |
| 309 } | |
| 310 | |
| 311 /* We got out of the loop because we ran out of combinations to try. */ | |
| 312 __set_errno (EEXIST); | |
| 313 return -1; | |
| 314 } |