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