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[newlib-cygwin] Cygwin: fix signal.h with _POSIX_C_SOURCE=1;h=8a508f301cb9fb7e11f7cc2e3be7ffd42e64c25f

commit 8a508f301cb9fb7e11f7cc2e3be7ffd42e64c25f
Author: Yaakov Selkowitz <>
Date:   Tue Jul 4 18:10:02 2017 -0500

    Cygwin: fix signal.h with _POSIX_C_SOURCE=1
    struct sigaction is POSIX.1-1990 but siginfo_t, which is used by its
    sa_sigaction member, is POSIX.1b-1993.  Therefore it needs to be guarded
    as well, and as part of a union, the struct size is protected.
    Signed-off-by: Yaakov Selkowitz <>

 winsup/cygwin/include/cygwin/signal.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/winsup/cygwin/include/cygwin/signal.h b/winsup/cygwin/include/cygwin/signal.h
index 700d45c..e73874c 100644
--- a/winsup/cygwin/include/cygwin/signal.h
+++ b/winsup/cygwin/include/cygwin/signal.h
@@ -325,7 +325,9 @@ struct sigaction
   __extension__ union
     _sig_func_ptr sa_handler;  		/* SIG_DFL, SIG_IGN, or pointer to a function */
+#if __POSIX_VISIBLE >= 199309
     void  (*sa_sigaction) ( int, siginfo_t *, void * );
   sigset_t sa_mask;
   int sa_flags;

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