From 371a3a2d058f3709baeeb0dbe18ae21ddb11ea90 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sun, 22 Jun 2008 21:54:08 +0200
Subject: [PATCH] Define SA_RESTART also for mingw.
---
ChangeLog | 3 +++
lib/sigaction.c | 14 +++++++++-----
lib/signal.in.h | 1 +
3 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index c4ad9767ab..8eab917113 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
2008-06-22 Bruno Haible <bruno@clisp.org>
+ * lib/signal.in.h (SA_RESTART): New macro.
+ * lib/sigaction.c: Update comment.
+
* m4/sigaction.m4 (gl_SIGACTION): Require gl_SIGNAL_H_DEFAULTS.
* m4/signalblocking.m4 (gl_PREREQ_SIG_HANDLER_H): New macro.
diff --git a/lib/sigaction.c b/lib/sigaction.c
index 9b0c92fdae..1bad8092f2 100644
--- a/lib/sigaction.c
+++ b/lib/sigaction.c
@@ -35,11 +35,15 @@
the situation by reading static storage in a signal handler, which
POSIX warns is not generically async-signal-safe. Oh well.
- Additionally, SIGCHLD is not defined, so we don't implement
- SA_NOCLDSTOP or SA_NOCLDWAIT; sigaltstack() is not present, so we
- don't implement SA_ONSTACK; and siginterrupt() is not present, so
- we don't implement SA_RESTART. Supporting SA_SIGINFO is impossible
- to do portably.
+ Additionally:
+ - We don't implement SA_NOCLDSTOP or SA_NOCLDWAIT, because SIGCHLD
+ is not defined.
+ - We don't implement SA_ONSTACK, because sigaltstack() is not present.
+ - We ignore SA_RESTART, because blocking Win32 calls are not interrupted
+ anyway when an asynchronous signal occurs, and the MSVCRT runtime
+ never sets errno to EINTR.
+ - We don't implement SA_SIGINFO because it is impossible to do so
+ portably.
POSIX states that an application should not mix signal() and
sigaction(). We support the use of signal() within the gnulib
diff --git a/lib/signal.in.h b/lib/signal.in.h
index f0551380cd..a1c9e6f6d3 100644
--- a/lib/signal.in.h
+++ b/lib/signal.in.h
@@ -142,6 +142,7 @@ struct sigaction
/* Unsupported flags are not present. */
# define SA_RESETHAND 1
# define SA_NODEFER 2
+# define SA_RESTART 4
extern int sigaction (int, const struct sigaction *restrict,
struct sigaction *restrict);
--
2.30.2