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1 | /* Error handler for noninteractive utilities |
2 | Copyright (C) 1990-1998, 2000-2007, 2009-2013 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
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, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ | |
19 | ||
20 | #if !_LIBC | |
21 | # include <config.h> | |
22 | #endif | |
23 | ||
24 | #include "error.h" | |
25 | ||
26 | #include <stdarg.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | ||
31 | #if !_LIBC && ENABLE_NLS | |
32 | # include "gettext.h" | |
33 | # define _(msgid) gettext (msgid) | |
34 | #endif | |
35 | ||
36 | #ifdef _LIBC | |
37 | # include <libintl.h> | |
38 | # include <stdbool.h> | |
39 | # include <stdint.h> | |
40 | # include <wchar.h> | |
41 | # define mbsrtowcs __mbsrtowcs | |
42 | #endif | |
43 | ||
44 | #if USE_UNLOCKED_IO | |
45 | # include "unlocked-io.h" | |
46 | #endif | |
47 | ||
48 | #ifndef _ | |
49 | # define _(String) String | |
50 | #endif | |
51 | ||
52 | /* If NULL, error will flush stdout, then print on stderr the program | |
53 | name, a colon and a space. Otherwise, error will call this | |
54 | function without parameters instead. */ | |
55 | void (*error_print_progname) (void); | |
56 | ||
57 | /* This variable is incremented each time 'error' is called. */ | |
58 | unsigned int error_message_count; | |
59 | ||
60 | #ifdef _LIBC | |
61 | /* In the GNU C library, there is a predefined variable for this. */ | |
62 | ||
63 | # define program_name program_invocation_name | |
64 | # include <errno.h> | |
65 | # include <limits.h> | |
66 | # include <libio/libioP.h> | |
67 | ||
68 | /* In GNU libc we want do not want to use the common name 'error' directly. | |
69 | Instead make it a weak alias. */ | |
70 | extern void __error (int status, int errnum, const char *message, ...) | |
71 | __attribute__ ((__format__ (__printf__, 3, 4))); | |
72 | extern void __error_at_line (int status, int errnum, const char *file_name, | |
73 | unsigned int line_number, const char *message, | |
74 | ...) | |
75 | __attribute__ ((__format__ (__printf__, 5, 6)));; | |
76 | # define error __error | |
77 | # define error_at_line __error_at_line | |
78 | ||
79 | # include <libio/iolibio.h> | |
80 | # define fflush(s) INTUSE(_IO_fflush) (s) | |
81 | # undef putc | |
82 | # define putc(c, fp) INTUSE(_IO_putc) (c, fp) | |
83 | ||
84 | # include <bits/libc-lock.h> | |
85 | ||
86 | #else /* not _LIBC */ | |
87 | ||
88 | # include <fcntl.h> | |
89 | # include <unistd.h> | |
90 | ||
91 | # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
92 | /* Get declarations of the native Windows API functions. */ | |
93 | # define WIN32_LEAN_AND_MEAN | |
94 | # include <windows.h> | |
95 | /* Get _get_osfhandle. */ | |
96 | # include "msvc-nothrow.h" | |
97 | # endif | |
98 | ||
99 | /* The gnulib override of fcntl is not needed in this file. */ | |
100 | # undef fcntl | |
101 | ||
102 | # if !HAVE_DECL_STRERROR_R | |
103 | # ifndef HAVE_DECL_STRERROR_R | |
104 | "this configure-time declaration test was not run" | |
105 | # endif | |
106 | # if STRERROR_R_CHAR_P | |
107 | char *strerror_r (); | |
108 | # else | |
109 | int strerror_r (); | |
110 | # endif | |
111 | # endif | |
112 | ||
113 | /* The calling program should define program_name and set it to the | |
114 | name of the executing program. */ | |
115 | extern char *program_name; | |
116 | ||
117 | # if HAVE_STRERROR_R || defined strerror_r | |
118 | # define __strerror_r strerror_r | |
119 | # endif /* HAVE_STRERROR_R || defined strerror_r */ | |
120 | #endif /* not _LIBC */ | |
121 | ||
122 | #if !_LIBC | |
123 | /* Return non-zero if FD is open. */ | |
124 | static int | |
125 | is_open (int fd) | |
126 | { | |
127 | # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
128 | /* On native Windows: The initial state of unassigned standard file | |
129 | descriptors is that they are open but point to an INVALID_HANDLE_VALUE. | |
130 | There is no fcntl, and the gnulib replacement fcntl does not support | |
131 | F_GETFL. */ | |
132 | return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE; | |
133 | # else | |
134 | # ifndef F_GETFL | |
135 | # error Please port fcntl to your platform | |
136 | # endif | |
137 | return 0 <= fcntl (fd, F_GETFL); | |
138 | # endif | |
139 | } | |
140 | #endif | |
141 | ||
142 | static void | |
143 | flush_stdout (void) | |
144 | { | |
145 | #if !_LIBC | |
146 | int stdout_fd; | |
147 | ||
148 | # if GNULIB_FREOPEN_SAFER | |
149 | /* Use of gnulib's freopen-safer module normally ensures that | |
150 | fileno (stdout) == 1 | |
151 | whenever stdout is open. */ | |
152 | stdout_fd = STDOUT_FILENO; | |
153 | # else | |
154 | /* POSIX states that fileno (stdout) after fclose is unspecified. But in | |
155 | practice it is not a problem, because stdout is statically allocated and | |
156 | the fd of a FILE stream is stored as a field in its allocated memory. */ | |
157 | stdout_fd = fileno (stdout); | |
158 | # endif | |
159 | /* POSIX states that fflush (stdout) after fclose is unspecified; it | |
160 | is safe in glibc, but not on all other platforms. fflush (NULL) | |
161 | is always defined, but too draconian. */ | |
162 | if (0 <= stdout_fd && is_open (stdout_fd)) | |
163 | #endif | |
164 | fflush (stdout); | |
165 | } | |
166 | ||
167 | static void | |
168 | print_errno_message (int errnum) | |
169 | { | |
170 | char const *s; | |
171 | ||
172 | #if defined HAVE_STRERROR_R || _LIBC | |
173 | char errbuf[1024]; | |
174 | # if STRERROR_R_CHAR_P || _LIBC | |
175 | s = __strerror_r (errnum, errbuf, sizeof errbuf); | |
176 | # else | |
177 | if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0) | |
178 | s = errbuf; | |
179 | else | |
180 | s = 0; | |
181 | # endif | |
182 | #else | |
183 | s = strerror (errnum); | |
184 | #endif | |
185 | ||
186 | #if !_LIBC | |
187 | if (! s) | |
188 | s = _("Unknown system error"); | |
189 | #endif | |
190 | ||
191 | #if _LIBC | |
192 | __fxprintf (NULL, ": %s", s); | |
193 | #else | |
194 | fprintf (stderr, ": %s", s); | |
195 | #endif | |
196 | } | |
197 | ||
198 | static void | |
199 | error_tail (int status, int errnum, const char *message, va_list args) | |
200 | { | |
201 | #if _LIBC | |
202 | if (_IO_fwide (stderr, 0) > 0) | |
203 | { | |
204 | # define ALLOCA_LIMIT 2000 | |
205 | size_t len = strlen (message) + 1; | |
206 | wchar_t *wmessage = NULL; | |
207 | mbstate_t st; | |
208 | size_t res; | |
209 | const char *tmp; | |
210 | bool use_malloc = false; | |
211 | ||
212 | while (1) | |
213 | { | |
214 | if (__libc_use_alloca (len * sizeof (wchar_t))) | |
215 | wmessage = (wchar_t *) alloca (len * sizeof (wchar_t)); | |
216 | else | |
217 | { | |
218 | if (!use_malloc) | |
219 | wmessage = NULL; | |
220 | ||
221 | wchar_t *p = (wchar_t *) realloc (wmessage, | |
222 | len * sizeof (wchar_t)); | |
223 | if (p == NULL) | |
224 | { | |
225 | free (wmessage); | |
226 | fputws_unlocked (L"out of memory\n", stderr); | |
227 | return; | |
228 | } | |
229 | wmessage = p; | |
230 | use_malloc = true; | |
231 | } | |
232 | ||
233 | memset (&st, '\0', sizeof (st)); | |
234 | tmp = message; | |
235 | ||
236 | res = mbsrtowcs (wmessage, &tmp, len, &st); | |
237 | if (res != len) | |
238 | break; | |
239 | ||
240 | if (__builtin_expect (len >= SIZE_MAX / 2, 0)) | |
241 | { | |
242 | /* This really should not happen if everything is fine. */ | |
243 | res = (size_t) -1; | |
244 | break; | |
245 | } | |
246 | ||
247 | len *= 2; | |
248 | } | |
249 | ||
250 | if (res == (size_t) -1) | |
251 | { | |
252 | /* The string cannot be converted. */ | |
253 | if (use_malloc) | |
254 | { | |
255 | free (wmessage); | |
256 | use_malloc = false; | |
257 | } | |
258 | wmessage = (wchar_t *) L"???"; | |
259 | } | |
260 | ||
261 | __vfwprintf (stderr, wmessage, args); | |
262 | ||
263 | if (use_malloc) | |
264 | free (wmessage); | |
265 | } | |
266 | else | |
267 | #endif | |
268 | vfprintf (stderr, message, args); | |
269 | va_end (args); | |
270 | ||
271 | ++error_message_count; | |
272 | if (errnum) | |
273 | print_errno_message (errnum); | |
274 | #if _LIBC | |
275 | __fxprintf (NULL, "\n"); | |
276 | #else | |
277 | putc ('\n', stderr); | |
278 | #endif | |
279 | fflush (stderr); | |
280 | if (status) | |
281 | exit (status); | |
282 | } | |
283 | ||
284 | ||
285 | /* Print the program name and error message MESSAGE, which is a printf-style | |
286 | format string with optional args. | |
287 | If ERRNUM is nonzero, print its corresponding system error message. | |
288 | Exit with status STATUS if it is nonzero. */ | |
289 | void | |
290 | error (int status, int errnum, const char *message, ...) | |
291 | { | |
292 | va_list args; | |
293 | ||
294 | #if defined _LIBC && defined __libc_ptf_call | |
295 | /* We do not want this call to be cut short by a thread | |
296 | cancellation. Therefore disable cancellation for now. */ | |
297 | int state = PTHREAD_CANCEL_ENABLE; | |
298 | __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state), | |
299 | 0); | |
300 | #endif | |
301 | ||
302 | flush_stdout (); | |
303 | #ifdef _LIBC | |
304 | _IO_flockfile (stderr); | |
305 | #endif | |
306 | if (error_print_progname) | |
307 | (*error_print_progname) (); | |
308 | else | |
309 | { | |
310 | #if _LIBC | |
311 | __fxprintf (NULL, "%s: ", program_name); | |
312 | #else | |
313 | fprintf (stderr, "%s: ", program_name); | |
314 | #endif | |
315 | } | |
316 | ||
317 | va_start (args, message); | |
318 | error_tail (status, errnum, message, args); | |
319 | ||
320 | #ifdef _LIBC | |
321 | _IO_funlockfile (stderr); | |
322 | # ifdef __libc_ptf_call | |
323 | __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0); | |
324 | # endif | |
325 | #endif | |
326 | } | |
327 | \f | |
328 | /* Sometimes we want to have at most one error per line. This | |
329 | variable controls whether this mode is selected or not. */ | |
330 | int error_one_per_line; | |
331 | ||
332 | void | |
333 | error_at_line (int status, int errnum, const char *file_name, | |
334 | unsigned int line_number, const char *message, ...) | |
335 | { | |
336 | va_list args; | |
337 | ||
338 | if (error_one_per_line) | |
339 | { | |
340 | static const char *old_file_name; | |
341 | static unsigned int old_line_number; | |
342 | ||
343 | if (old_line_number == line_number | |
344 | && (file_name == old_file_name | |
345 | || strcmp (old_file_name, file_name) == 0)) | |
346 | /* Simply return and print nothing. */ | |
347 | return; | |
348 | ||
349 | old_file_name = file_name; | |
350 | old_line_number = line_number; | |
351 | } | |
352 | ||
353 | #if defined _LIBC && defined __libc_ptf_call | |
354 | /* We do not want this call to be cut short by a thread | |
355 | cancellation. Therefore disable cancellation for now. */ | |
356 | int state = PTHREAD_CANCEL_ENABLE; | |
357 | __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state), | |
358 | 0); | |
359 | #endif | |
360 | ||
361 | flush_stdout (); | |
362 | #ifdef _LIBC | |
363 | _IO_flockfile (stderr); | |
364 | #endif | |
365 | if (error_print_progname) | |
366 | (*error_print_progname) (); | |
367 | else | |
368 | { | |
369 | #if _LIBC | |
370 | __fxprintf (NULL, "%s:", program_name); | |
371 | #else | |
372 | fprintf (stderr, "%s:", program_name); | |
373 | #endif | |
374 | } | |
375 | ||
376 | #if _LIBC | |
377 | __fxprintf (NULL, file_name != NULL ? "%s:%d: " : " ", | |
378 | file_name, line_number); | |
379 | #else | |
380 | fprintf (stderr, file_name != NULL ? "%s:%d: " : " ", | |
381 | file_name, line_number); | |
382 | #endif | |
383 | ||
384 | va_start (args, message); | |
385 | error_tail (status, errnum, message, args); | |
386 | ||
387 | #ifdef _LIBC | |
388 | _IO_funlockfile (stderr); | |
389 | # ifdef __libc_ptf_call | |
390 | __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0); | |
391 | # endif | |
392 | #endif | |
393 | } | |
394 | ||
395 | #ifdef _LIBC | |
396 | /* Make the weak alias. */ | |
397 | # undef error | |
398 | # undef error_at_line | |
399 | weak_alias (__error, error) | |
400 | weak_alias (__error_at_line, error_at_line) | |
401 | #endif |