mirror of
https://github.com/adulau/dcfldd.git
synced 2024-12-22 16:56:03 +00:00
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/* safe-read.c -- an interface to read that retries after interrupts
|
|
Copyright (C) 1993, 1994, 1998 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 2, 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.
|
|
*/
|
|
|
|
#if HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
|
|
#if HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#ifndef errno
|
|
extern int errno;
|
|
#endif
|
|
|
|
#include "safe-read.h"
|
|
|
|
/* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted.
|
|
Return the actual number of bytes read, zero for EOF, or negative
|
|
for an error. */
|
|
|
|
ssize_t
|
|
safe_read (int desc, void *ptr, size_t len)
|
|
{
|
|
ssize_t n_chars;
|
|
|
|
if (len <= 0)
|
|
return len;
|
|
|
|
#ifdef EINTR
|
|
do
|
|
{
|
|
n_chars = read (desc, ptr, len);
|
|
}
|
|
while (n_chars < 0 && errno == EINTR);
|
|
#else
|
|
n_chars = read (desc, ptr, len);
|
|
#endif
|
|
|
|
return n_chars;
|
|
}
|