docs: mention MacOS issue with WEXITSTATUS(constant)

[pspp] / doc / posix-headers / signal.texi

diff --git a/doc/posix-headers/signal.texi b/doc/posix-headers/signal.texi
index 924408992f0fbe657f9b1f9f83745f0b4b068c41..5dff85beedf7360f5d45e29f8b38542aeb7ef248 100644 (file)
--- a/doc/posix-headers/signal.texi
+++ b/doc/posix-headers/signal.texi
@@ -1,27 +1,38 @@
 @node signal.h
 @section @file{signal.h}
 
-POSIX specification: @url{http://www.opengroup.org/susv3xbd/signal.h.html}
+POSIX specification:@* @url{http://www.opengroup.org/susv3xbd/signal.h.html}
 
 Gnulib module: signal
 
 Portability problems fixed by Gnulib:
 @itemize
 @item
+@code{volatile sig_atomic_t} is rejected by older compilers on some
+platforms:
+AIX.
+@item
 @code{sigset_t} is only declared in <sys/types.h> on some platforms:
 mingw.
-
 @item
 @code{struct sigaction} and @code{siginfo_t} are missing on some
 platforms:
 mingw.
-
 @item
 @code{struct sigaction} lacks the @code{sa_sigaction} member on some
 platforms:
 Irix 5.3, Interix 3.5.
+@item
+The signal @code{SIGPIPE} is not defined on some platforms:
+mingw.
+@item
+The macro @code{SA_NODEFER} is not defined on some platforms:
+Interix 3.5.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+Many signals are not defined on some platforms:
+mingw.
 @end itemize