+++ /dev/null
-/* Close standard output and standard error, exiting with a diagnostic on error.
-
- Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2006, 2008 Free
- Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <config.h>
-
-#include "closeout.h"
-
-#include <errno.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <unistd.h>
-
-#include "gettext.h"
-#define _(msgid) gettext (msgid)
-
-#include "close-stream.h"
-#include "error.h"
-#include "exitfail.h"
-#include "quotearg.h"
-
-static const char *file_name;
-
-/* Set the file name to be reported in the event an error is detected
- by close_stdout. */
-void
-close_stdout_set_file_name (const char *file)
-{
- file_name = file;
-}
-
-static bool ignore_EPIPE /* = false */;
-
-/* Specify the reaction to an EPIPE error during the closing of stdout:
- - If ignore = true, it shall be ignored.
- - If ignore = false, it shall evoke a diagnostic, along with a nonzero
- exit status.
- The default is ignore = false.
-
- This setting matters only if the SIGPIPE signal is ignored (i.e. its
- handler set to SIG_IGN) or blocked. Only particular programs need to
- temporarily ignore SIGPIPE. If SIGPIPE is ignored or blocked because
- it was ignored or blocked in the parent process when it created the
- child process, it usually is a bug in the parent process: It is bad
- practice to have SIGPIPE ignored or blocked while creating a child
- process.
-
- EPIPE occurs when writing to a pipe or socket that has no readers now,
- when SIGPIPE is ignored or blocked.
-
- The ignore = false setting is suitable for a scenario where it is normally
- guaranteed that the pipe writer terminates before the pipe reader. In
- this case, an EPIPE is an indication of a premature termination of the
- pipe reader and should lead to a diagnostic and a nonzero exit status.
-
- The ignore = true setting is suitable for a scenario where you don't know
- ahead of time whether the pipe writer or the pipe reader will terminate
- first. In this case, an EPIPE is an indication that the pipe writer can
- stop doing useless write() calls; this is what close_stdout does anyway.
- EPIPE is part of the normal pipe/socket shutdown protocol in this case,
- and should not lead to a diagnostic message. */
-
-void
-close_stdout_set_ignore_EPIPE (bool ignore)
-{
- ignore_EPIPE = ignore;
-}
-
-/* Close standard output. On error, issue a diagnostic and _exit
- with status 'exit_failure'.
-
- Also close standard error. On error, _exit with status 'exit_failure'.
-
- Since close_stdout is commonly registered via 'atexit', POSIX
- and the C standard both say that it should not call 'exit',
- because the behavior is undefined if 'exit' is called more than
- once. So it calls '_exit' instead of 'exit'. If close_stdout
- is registered via atexit before other functions are registered,
- the other functions can act before this _exit is invoked.
-
- Applications that use close_stdout should flush any streams
- other than stdout and stderr before exiting, since the call to
- _exit will bypass other buffer flushing. Applications should
- be flushing and closing other streams anyway, to check for I/O
- errors. Also, applications should not use tmpfile, since _exit
- can bypass the removal of these files.
-
- It's important to detect such failures and exit nonzero because many
- tools (most notably `make' and other build-management systems) depend
- on being able to detect failure in other tools via their exit status. */
-
-void
-close_stdout (void)
-{
- if (close_stream (stdout) != 0
- && !(ignore_EPIPE && errno == EPIPE))
- {
- char const *write_error = _("write error");
- if (file_name)
- error (0, errno, "%s: %s", quotearg_colon (file_name),
- write_error);
- else
- error (0, errno, "%s", write_error);
-
- _exit (exit_failure);
- }
-
- if (close_stream (stderr) != 0)
- _exit (exit_failure);
-}
projects / tar / blobdiff