signal.h: sa_handler not usable when compiling with `gcc -ansi'

[Anschuetz, Andreas]

cygwin: cygwin-1.5.17-1
Win OS tested: Windows 2000

The sa_handler entry of the sigaction structure is not accessible
when I compile with `gcc -ansi' (Makefile and example `signal-test.c'
attached):

gcc -ansi -o signal-ansi signal.c
signal.c: In function `main':
signal.c:13: error: structure has no member named `sa_handler'

The following line caused the error:
   sa_on.sa_handler = sighandler;

The same program is compilable with `gcc -std=gnu89'. I assume that
the anonymous union in `struct sigaction' in /usr/include/cygwin/signal.h
is not iso9899:1990 conform. 

Is compiling with the `-ansi' option not supported by cygwin or is this
a bug?

In case of it is a bug in cygwin I've also included an example patch
which fixes the problem, the code which fixes the problem is taken from
/usr/include/signal.h.

Regards,
   Andreas Anschuetz
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--- signal.h.orig	2005-06-23 20:42:25.828859000 +0200

+++ signal.h	2005-06-23 20:58:53.769448000 +0200

@@ -150,11 +150,16 @@

   {

     _sig_func_ptr sa_handler;  		/* SIG_DFL, SIG_IGN, or pointer to a function */

     void  (*sa_sigaction) ( int, siginfo_t *, void * );

-  };

+  } _signal_handlers;

   sigset_t sa_mask;

   int sa_flags;

 };

 

+#define sa_handler    _signal_handlers.sa_handler

+#if defined(_POSIX_REALTIME_SIGNALS)

+#define sa_sigaction  _signal_handlers.sa_sigaction

+#endif

+

 #define SA_NOCLDSTOP 1   		/* Do not generate SIGCHLD when children

 					   stop */

 #define SA_SIGINFO   2   		/* Invoke the signal catching function

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signal-ansi:

	gcc -ansi -o signal-ansi signal-test.c



signal-gnu89:

	gcc -std=gnu89 -o signal-gnu89 signal-test.c