Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/closeout.c @ 1772:69f2bf72fbe3
fix comments
add FIXME
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Sun, 04 Apr 1999 14:30:30 +0000 |
| parents | 096732ffc839 |
| children | be6bb70a4fea |
| rev | line source |
|---|---|
| 1197 | 1 /* closeout.c - close standard output |
| 1662 | 2 Copyright (C) 1998, 1999 Free Software Foundation, Inc. |
| 1197 | 3 |
| 4 This program is free software; you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 2, or (at your option) | |
| 7 any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program; if not, write to the Free Software Foundation, | |
| 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
| 17 | |
| 18 #if HAVE_CONFIG_H | |
| 19 # include <config.h> | |
| 20 #endif | |
| 21 | |
| 22 #if ENABLE_NLS | |
| 23 # include <libintl.h> | |
| 24 # define _(Text) gettext (Text) | |
| 25 #else | |
| 26 # define _(Text) Text | |
| 27 #endif | |
| 28 | |
|
1278
9ad625a30b7d
Use #if, not #ifdef with HAVE_ macros
Jim Meyering <jim@meyering.net>
parents:
1197
diff
changeset
|
29 #if HAVE_STDLIB_H |
| 1197 | 30 # include <stdlib.h> |
| 31 #endif | |
| 32 #ifndef EXIT_FAILURE | |
| 33 # define EXIT_FAILURE 1 | |
| 34 #endif | |
| 35 | |
| 36 #include <errno.h> | |
| 37 #ifndef errno | |
| 38 extern int errno; | |
| 39 #endif | |
| 40 | |
| 41 #include <stdio.h> | |
| 42 #include "closeout.h" | |
| 43 #include "error.h" | |
| 44 | |
| 1662 | 45 /* Close standard output, exiting with status STATUS on failure. |
| 1772 | 46 If a program writes *anything* to stdout, that program should `fflush' |
| 47 stdout and make sure that it succeeds before exiting. Otherwise, | |
| 48 suppose that you go to the extreme of checking the return status | |
| 49 of every function that does an explicit write to stdout. The last | |
| 50 printf can succeed in writing to the internal stream buffer, and yet | |
| 51 the fclose(stdout) could still fail (due e.g., to a disk full error) | |
| 52 when it tries to write out that buffered data. Thus, you would be | |
| 53 left with an incomplete output file and the offending program would | |
| 54 exit successfully. | |
| 55 | |
| 56 FIXME: note the fflush suggested above is implicit in the fclose | |
| 57 we actually do below. Consider doing only the fflush and/or using | |
| 58 setvbuf to inhibit buffering. | |
| 1662 | 59 |
| 60 Besides, it's wasteful to check the return value from every call | |
| 61 that writes to stdout -- just let the internal stream state record | |
| 62 the failure. That's what the ferror test is checking below. | |
| 63 | |
| 64 It's important to detect such failures and exit nonzero because many | |
| 65 tools (most notably `make' and other build-management systems) depend | |
| 66 on being able to detect failure in other tools via their exit status. */ | |
| 1197 | 67 void |
| 68 close_stdout_status (int status) | |
| 69 { | |
| 70 if (ferror (stdout)) | |
| 71 error (status, 0, _("write error")); | |
| 72 if (fclose (stdout) != 0) | |
| 73 error (status, errno, _("write error")); | |
| 74 } | |
| 75 | |
| 76 /* Close standard output, exiting with status EXIT_FAILURE on failure. */ | |
| 77 void | |
| 78 close_stdout (void) | |
| 79 { | |
| 80 close_stdout_status (EXIT_FAILURE); | |
| 81 } |