vasilito
facf0c92e0
Red Bear OS is a full fork. All sources must be available from git clone with zero network access. Removed gitignore rules that excluded fetched source trees under recipes/*/source/, local/recipes/kde/*/source/, local/recipes/qt/*/source/, and vendor source trees. Build artifacts (target/, build/, source.tar, *.o, *.so) remain excluded. 127291 files added — kernel, relibc, base, bootloader, pkgar, all KDE/Qt frameworks, mesa, wayland, DRM drivers, and every other recipe source.
88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
/* closeout.c - close standard output and standard error
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Copyright (C) 1998-2007, 2012 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 3 of the License, or
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(at your option) 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, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "closeout.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "error.h"
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#include "fwriteerror.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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If the stdout file descriptor was initially closed (such as when executing
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a program through "program 1>&-"), it is a failure if and only if some
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output was made to stdout.
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Likewise for standard error.
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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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/* Close standard output and standard error, exiting with status EXIT_FAILURE
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on failure. */
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void
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close_stdout (void)
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{
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/* Close standard output. */
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if (fwriteerror_no_ebadf (stdout))
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error (EXIT_FAILURE, errno, "%s", _("write error"));
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/* Close standard error. This is simpler than fwriteerror_no_ebadf, because
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upon failure we don't need an errno - all we can do at this point is to
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set an exit status. */
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errno = 0;
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if (ferror (stderr) || fflush (stderr))
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{
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fclose (stderr);
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exit (EXIT_FAILURE);
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}
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if (fclose (stderr) && errno != EBADF)
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exit (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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