1 /* Close standard output and standard error, exiting with a diagnostic on error.
2
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2006 Free
4 Software Foundation, Inc.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20 #include <config.h>
21
22 #include "closeout.h"
23
24 #include <errno.h>
25 #include <stdio.h>
26 #include <unistd.h>
27
28 #include "gettext.h"
29 #define _(msgid) gettext (msgid)
30
31 #include "close-stream.h"
32 #include "error.h"
33 #include "exitfail.h"
34 #include "quotearg.h"
35
36 static const char *file_name;
37
38 /* Set the file name to be reported in the event an error is detected
39 by close_stdout. */
40 void
close_stdout_set_file_name(const char * file)41 close_stdout_set_file_name (const char *file)
42 {
43 file_name = file;
44 }
45
46 /* Close standard output. On error, issue a diagnostic and _exit
47 with status 'exit_failure'.
48
49 Also close standard error. On error, _exit with status 'exit_failure'.
50
51 Since close_stdout is commonly registered via 'atexit', POSIX
52 and the C standard both say that it should not call 'exit',
53 because the behavior is undefined if 'exit' is called more than
54 once. So it calls '_exit' instead of 'exit'. If close_stdout
55 is registered via atexit before other functions are registered,
56 the other functions can act before this _exit is invoked.
57
58 Applications that use close_stdout should flush any streams
59 other than stdout and stderr before exiting, since the call to
60 _exit will bypass other buffer flushing. Applications should
61 be flushing and closing other streams anyway, to check for I/O
62 errors. Also, applications should not use tmpfile, since _exit
63 can bypass the removal of these files.
64
65 It's important to detect such failures and exit nonzero because many
66 tools (most notably `make' and other build-management systems) depend
67 on being able to detect failure in other tools via their exit status. */
68
69 void
close_stdout(void)70 close_stdout (void)
71 {
72 if (close_stream (stdout) != 0)
73 {
74 char const *write_error = _("write error");
75 if (file_name)
76 error (0, errno, "%s: %s", quotearg_colon (file_name),
77 write_error);
78 else
79 error (0, errno, "%s", write_error);
80
81 _exit (exit_failure);
82 }
83
84 if (close_stream (stderr) != 0)
85 _exit (exit_failure);
86 }
87