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