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We did not have a safe_write, which is the analog to safe_read. Convert

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full_write to use safe_write internally, which is needed to guarantee proper
behavior, i.e. when writing to a pipe.
This commit is contained in:
Eric Andersen 2003-10-09 08:35:42 +00:00
parent 638da75f4b
commit dae099b2f9
3 changed files with 50 additions and 1 deletions
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1
include/libbb.h
View File

@ -109,6 +109,7 @@ extern int is_directory(const char *name, int followLinks, struct stat *statBuf)
extern int remove_file(const char *path, int flags);
extern int copy_file(const char *source, const char *dest, int flags);
extern ssize_t safe_read(int fd, void *buf, size_t count);
extern ssize_t safe_write(int fd, void *buf, size_t count);
extern ssize_t bb_full_write(int fd, const void *buf, size_t len);
extern ssize_t bb_full_read(int fd, void *buf, size_t len);
extern int recursive_action(const char *fileName, int recurse,

2
libbb/full_write.c
View File

@ -36,7 +36,7 @@ ssize_t bb_full_write(int fd, const void *buf, size_t len)
total = 0;
while (len > 0) {
cc = write(fd, buf, len);
cc = safe_write(fd, buf, len);
if (cc < 0)
return cc; /* write() returns -1 on failure. */

48
libbb/safe_write.c Normal file
View File

@ -0,0 +1,48 @@
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include "libbb.h"
ssize_t safe_write(int fd, void *buf, size_t count)
{
ssize_t n;
do {
n = write(fd, buf, count);
} while (n < 0 && errno == EINTR);
return n;
}
/* END CODE */
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/