1 /* Error handler for noninteractive utilities
2 Copyright (C) 1990-2013 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library 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 GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
35 # define mbsrtowcs __mbsrtowcs
41 # define _(String) String
44 /* If NULL, error will flush stdout, then print on stderr the program
45 name, a colon and a space. Otherwise, error will call this
46 function without parameters instead. */
47 void (*error_print_progname) (void);
49 /* This variable is incremented each time `error' is called. */
50 unsigned int error_message_count;
53 /* In the GNU C library, there is a predefined variable for this. */
55 # define program_name program_invocation_name
58 # include <libio/libioP.h>
60 /* In GNU libc we want do not want to use the common name `error' directly.
61 Instead make it a weak alias. */
62 extern void __error (int status, int errnum, const char *message, ...)
63 __attribute__ ((__format__ (__printf__, 3, 4)));
64 extern void __error_at_line (int status, int errnum, const char *file_name,
65 unsigned int line_number, const char *message,
67 __attribute__ ((__format__ (__printf__, 5, 6)));;
68 # define error __error
69 # define error_at_line __error_at_line
71 # include <libio/iolibio.h>
72 # define fflush(s) _IO_fflush (s)
74 # define putc(c, fp) _IO_putc (c, fp)
76 # include <bits/libc-lock.h>
80 # if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
81 # ifndef HAVE_DECL_STRERROR_R
82 "this configure-time declaration test was not run"
87 /* The calling program should define program_name and set it to the
88 name of the executing program. */
89 extern char *program_name;
91 # if HAVE_STRERROR_R || defined strerror_r
92 # define __strerror_r strerror_r
93 # endif /* HAVE_STRERROR_R || defined strerror_r */
94 #endif /* not _LIBC */
97 print_errno_message (int errnum)
101 #if defined HAVE_STRERROR_R || _LIBC
103 # if STRERROR_R_CHAR_P || _LIBC
104 s = __strerror_r (errnum, errbuf, sizeof errbuf);
106 if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
112 s = strerror (errnum);
117 s = _("Unknown system error");
121 __fxprintf (NULL, ": %s", s);
123 fprintf (stderr, ": %s", s);
128 error_tail (int status, int errnum, const char *message, va_list args)
131 if (_IO_fwide (stderr, 0) > 0)
133 size_t len = strlen (message) + 1;
134 wchar_t *wmessage = NULL;
138 bool use_malloc = false;
142 if (__libc_use_alloca (len * sizeof (wchar_t)))
143 wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
149 wchar_t *p = (wchar_t *) realloc (wmessage,
150 len * sizeof (wchar_t));
154 fputws_unlocked (L"out of memory\n", stderr);
161 memset (&st, '\0', sizeof (st));
164 res = mbsrtowcs (wmessage, &tmp, len, &st);
168 if (__builtin_expect (len >= SIZE_MAX / 2, 0))
170 /* This really should not happen if everything is fine. */
178 if (res == (size_t) -1)
180 /* The string cannot be converted. */
186 wmessage = (wchar_t *) L"???";
189 __vfwprintf (stderr, wmessage, args);
196 vfprintf (stderr, message, args);
199 ++error_message_count;
201 print_errno_message (errnum);
203 __fxprintf (NULL, "\n");
213 /* Print the program name and error message MESSAGE, which is a printf-style
214 format string with optional args.
215 If ERRNUM is nonzero, print its corresponding system error message.
216 Exit with status STATUS if it is nonzero. */
218 error (int status, int errnum, const char *message, ...)
222 #if defined _LIBC && defined __libc_ptf_call
223 /* We do not want this call to be cut short by a thread
224 cancellation. Therefore disable cancellation for now. */
225 int state = PTHREAD_CANCEL_ENABLE;
226 __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
232 _IO_flockfile (stderr);
234 if (error_print_progname)
235 (*error_print_progname) ();
239 __fxprintf (NULL, "%s: ", program_name);
241 fprintf (stderr, "%s: ", program_name);
245 va_start (args, message);
246 error_tail (status, errnum, message, args);
249 _IO_funlockfile (stderr);
250 # ifdef __libc_ptf_call
251 __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
256 /* Sometimes we want to have at most one error per line. This
257 variable controls whether this mode is selected or not. */
258 int error_one_per_line;
261 error_at_line (int status, int errnum, const char *file_name,
262 unsigned int line_number, const char *message, ...)
266 if (error_one_per_line)
268 static const char *old_file_name;
269 static unsigned int old_line_number;
271 if (old_line_number == line_number
272 && (file_name == old_file_name
273 || (old_file_name != NULL
275 && strcmp (old_file_name, file_name) == 0)))
276 /* Simply return and print nothing. */
279 old_file_name = file_name;
280 old_line_number = line_number;
283 #if defined _LIBC && defined __libc_ptf_call
284 /* We do not want this call to be cut short by a thread
285 cancellation. Therefore disable cancellation for now. */
286 int state = PTHREAD_CANCEL_ENABLE;
287 __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
293 _IO_flockfile (stderr);
295 if (error_print_progname)
296 (*error_print_progname) ();
300 __fxprintf (NULL, "%s:", program_name);
302 fprintf (stderr, "%s:", program_name);
307 __fxprintf (NULL, file_name != NULL ? "%s:%d: " : " ",
308 file_name, line_number);
310 fprintf (stderr, file_name != NULL ? "%s:%d: " : " ",
311 file_name, line_number);
314 va_start (args, message);
315 error_tail (status, errnum, message, args);
318 _IO_funlockfile (stderr);
319 # ifdef __libc_ptf_call
320 __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
326 /* Make the weak alias. */
328 # undef error_at_line
329 weak_alias (__error, error)
330 weak_alias (__error_at_line, error_at_line)