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84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/* Close standard output, exiting with a diagnostic on error.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2006 Free
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Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "closeout.h"
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "gettext.h"
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#define _(msgid) gettext (msgid)
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#include "close-stream.h"
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#include "error.h"
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#include "exitfail.h"
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#include "quotearg.h"
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static const char *file_name;
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/* Set the file name to be reported in the event an error is detected
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by close_stdout. */
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void
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close_stdout_set_file_name (const char *file)
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{
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file_name = file;
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}
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/* Close standard output. On error, issue a diagnostic and _exit
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with status 'exit_failure'.
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Since close_stdout is commonly registered via 'atexit', POSIX
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and the C standard both say that it should not call 'exit',
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because the behavior is undefined if 'exit' is called more than
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once. So it calls '_exit' instead of 'exit'. If close_stdout
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is registered via atexit before other functions are registered,
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the other functions can act before this _exit is invoked.
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Applications that use close_stdout should flush any streams
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other than stdout and stderr before exiting, since the call to
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_exit will bypass other buffer flushing. Applications should
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be flushing and closing other streams anyway, to check for I/O
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errors. Also, applications should not use tmpfile, since _exit
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can bypass the removal of these files.
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It's important to detect such failures and exit nonzero because many
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tools (most notably `make' and other build-management systems) depend
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on being able to detect failure in other tools via their exit status. */
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void
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close_stdout (void)
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{
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if (close_stream (stdout) != 0)
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{
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char const *write_error = _("write error");
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if (file_name)
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error (0, errno, "%s: %s", quotearg_colon (file_name),
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write_error);
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else
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error (0, errno, "%s", write_error);
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_exit (exit_failure);
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}
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}
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