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81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/* closeout.c - close standard output
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Copyright (C) 1998-2005 Free 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Specification. */
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#include "closeout.h"
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#include <stdio.h>
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#include <errno.h>
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#if 0
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#include "unlocked-io.h"
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#include "__fpending.h"
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#endif
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#include "error.h"
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#include "fwriteerror.h"
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#include "exit.h"
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#include "gettext.h"
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#define _(msgid) gettext (msgid)
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/* Close standard output, exiting with status STATUS on failure.
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If a program writes *anything* to stdout, that program should close
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stdout and make sure that it succeeds before exiting. Otherwise,
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suppose that you go to the extreme of checking the return status
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of every function that does an explicit write to stdout. The last
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printf can succeed in writing to the internal stream buffer, and yet
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the fclose(stdout) could still fail (due e.g., to a disk full error)
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when it tries to write out that buffered data. Thus, you would be
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left with an incomplete output file and the offending program would
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exit successfully. Even calling fflush is not always sufficient,
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since some file systems (NFS and CODA) buffer written/flushed data
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until an actual close call.
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Besides, it's wasteful to check the return value from every call
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that writes to stdout -- just let the internal stream state record
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the failure. That's what the ferror test is checking below.
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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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static void
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close_stdout_status (int status)
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{
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if (fwriteerror (stdout))
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error (status, errno, "%s", _("write error"));
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}
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/* Close standard output, exiting with status EXIT_FAILURE on failure. */
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void
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close_stdout (void)
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{
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close_stdout_status (EXIT_FAILURE);
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}
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/* Note: When exit (...) calls the atexit-registered
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close_stdout (), which calls
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error (status, ...), which calls
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exit (status),
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we have undefined behaviour according to ISO C 99 section 7.20.4.3.(2).
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But in practice there is no problem: The second exit call is executed
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at a moment when the atexit handlers are no longer active. */
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