X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fsafe-read.h;h=7174de7e125945c03de0754c88f13628195b8bb4;hb=6e33eaed1cd5ddcdfc48476059012fed68f71f8e;hp=c4445ac1b8558ca781830c6dbe6295edbdac4d85;hpb=849efe7683e163ede9240b27d675977c71c76ce8;p=gnulib.git
diff --git a/lib/safe-read.h b/lib/safe-read.h
index c4445ac1b..7174de7e1 100644
--- a/lib/safe-read.h
+++ b/lib/safe-read.h
@@ -1,10 +1,10 @@
/* An interface to read() that retries after interrupts.
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2006, 2009-2011 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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.
+ 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
@@ -12,12 +12,36 @@
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. */
+ 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: MacOS 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 (size_t) -1
- for an error. */
+ 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