X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fsafe-read.h;h=992b7a6a5dfc1e22114cc47e018caebcfeee3e06;hb=ca369c8d661a10d8a0ae3d712e7dfa91664921f1;hp=3734671de1e8974552cb21887b9b9010cfe6091d;hpb=84acb508aa24433c9e4fa17c1038ed6cac613fba;p=gnulib.git diff --git a/lib/safe-read.h b/lib/safe-read.h index 3734671de..992b7a6a5 100644 --- a/lib/safe-read.h +++ b/lib/safe-read.h @@ -1,2 +1,47 @@ -ssize_t -safe_read (int desc, char *ptr, size_t len); +/* An interface to read() that retries after interrupts. + Copyright (C) 2002, 2006, 2009-2013 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 . */ + +/* Some system calls may be interrupted and fail with errno = EINTR in the + following situations: + - The process is stopped and restarted (signal SIGSTOP and SIGCONT, user + types Ctrl-Z) on some platforms: Mac OS X. + - The process receives a signal for which a signal handler was installed + with sigaction() with an sa_flags field that does not contain + SA_RESTART. + - The process receives a signal for which a signal handler was installed + with signal() and for which no call to siginterrupt(sig,0) was done, + on some platforms: AIX, HP-UX, IRIX, OSF/1, Solaris. + + This module provides a wrapper around read() that handles EINTR. */ + +#include + +#ifdef __cplusplus +extern "C" { +#endif + + +#define SAFE_READ_ERROR ((size_t) -1) + +/* Read up to COUNT bytes at BUF from descriptor FD, retrying if interrupted. + Return the actual number of bytes read, zero for EOF, or SAFE_READ_ERROR + upon error. */ +extern size_t safe_read (int fd, void *buf, size_t count); + + +#ifdef __cplusplus +} +#endif