X-Git-Url: https://git.gag.com/?a=blobdiff_plain;ds=sidebyside;f=lib%2Fclose-stream.c;fp=lib%2Fclose-stream.c;h=0000000000000000000000000000000000000000;hb=22f1eb8bc17e5be72dd23d42d6aaa60196ac22e6;hp=59ab616b1ea43eb3ccef77aed89d13175bec4607;hpb=00fa13ff3f2d5b6e2a94c5e948c38616ff7ad37a;p=debian%2Ftar diff --git a/lib/close-stream.c b/lib/close-stream.c deleted file mode 100644 index 59ab616b..00000000 --- a/lib/close-stream.c +++ /dev/null @@ -1,79 +0,0 @@ -/* Close a stream, with nicer error checking than fclose's. - - Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2006, 2007, 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 . */ - -#include - -#include "close-stream.h" - -#include -#include - -#include "fpending.h" - -#if USE_UNLOCKED_IO -# include "unlocked-io.h" -#endif - -/* Close STREAM. Return 0 if successful, EOF (setting errno) - otherwise. A failure might set errno to 0 if the error number - cannot be determined. - - A failure with errno set to EPIPE may or may not indicate an error - situation worth signaling to the user. See the documentation of the - close_stdout_set_ignore_EPIPE function for details. - - If a program writes *anything* to STREAM, that program should close - STREAM and make sure that it succeeds before exiting. Otherwise, - suppose that you go to the extreme of checking the return status - of every function that does an explicit write to STREAM. The last - printf can succeed in writing to the internal stream buffer, and yet - the fclose(STREAM) could still fail (due e.g., to a disk full error) - when it tries to write out that buffered data. Thus, you would be - left with an incomplete output file and the offending program would - exit successfully. Even calling fflush is not always sufficient, - since some file systems (NFS and CODA) buffer written/flushed data - until an actual close call. - - Besides, it's wasteful to check the return value from every call - that writes to STREAM -- just let the internal stream state record - the failure. That's what the ferror test is checking below. */ - -int -close_stream (FILE *stream) -{ - bool some_pending = (__fpending (stream) != 0); - bool prev_fail = (ferror (stream) != 0); - bool fclose_fail = (fclose (stream) != 0); - - /* Return an error indication if there was a previous failure or if - fclose failed, with one exception: ignore an fclose failure if - there was no previous error, no data remains to be flushed, and - fclose failed with EBADF. That can happen when a program like cp - is invoked like this `cp a b >&-' (i.e., with standard output - closed) and doesn't generate any output (hence no previous error - and nothing to be flushed). */ - - if (prev_fail || (fclose_fail && (some_pending || errno != EBADF))) - { - if (! fclose_fail) - errno = 0; - return EOF; - } - - return 0; -}