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/* safe-read.c -- an interface to read that retries after interrupts
Copyright (C) 1993, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#ifndef STDC_HEADERS
extern int errno;
#endif
/* Read LEN bytes at PTR from descriptor DESC, for file FILENAME,
retrying if necessary. Return a negative value if an error occurs,
otherwise return the actual number of bytes read,
which must be LEN unless end-of-file was reached. */
The canonical source for this function is in the gcc distribution
in file cccp.c. So don't make any changes here. */
static int
safe_read (desc, ptr, len)
int desc;
char *ptr;
int len;
{
int left = len;
while (left > 0) {
int nchars = read (desc, ptr, left);
if (nchars < 0)
{
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
return nchars;
}
if (nchars == 0)
break;
ptr += nchars;
left -= nchars;
}
return len - left;
}
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