Mercurial > gnulib
view lib/safe-read.c @ 255:ed27c3582f3b
GNU file utilities
author | Jim Meyering <jim@meyering.net> |
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date | Sun, 02 Oct 1994 05:35:03 +0000 |
parents | b701d2d6b404 |
children |
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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, retrying if interrupted. Return the actual number of bytes read, zero for EOF, or negative for an error. */ int safe_read (desc, ptr, len) int desc; char *ptr; int len; { int 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; }