@section @code{sigaction}
@findex sigaction
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/sigaction.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/sigaction.html}
Gnulib module: sigaction
mingw.
@item
+In spite of having SA_SIGACTION, struct sigaction lacks the
+sa_sigaction member on some platforms:
+Irix 5.3.
+
+@item
The symbolic value @code{SIG_IGN} for the @code{SIGCHLD} signal is equivalent
to a signal handler
@smallexample