From 931f40b5a801743dff602b9e75e3c754bfbc7221 Mon Sep 17 00:00:00 2001
From: William McBrine <wmcbrine@gmail.com>
Date: Thu, 28 Dec 2017 19:30:28 -0500
Subject: [PATCH] The return value for signal() is standardized as void, as of
 C89; AC_TYPE_SIGNAL is deprecated.

---
 x11/config.h.in  | 3 ---
 x11/configure.ac | 1 -
 x11/pdcx11.h     | 4 ++--
 x11/x11.c        | 4 ++--
 4 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/x11/config.h.in b/x11/config.h.in
index 485ea727..e7abbe55 100644
--- a/x11/config.h.in
+++ b/x11/config.h.in
@@ -75,9 +75,6 @@
 /* Define as the system defined limit for number of signals */
 #undef PDC_MAX_SIGNALS
 
-/* Define as the return type of signal handlers (`int' or `void'). */
-#undef RETSIGTYPE
-
 /* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
 #undef TIME_WITH_SYS_TIME
 
diff --git a/x11/configure.ac b/x11/configure.ac
index c8019c60..771277cc 100644
--- a/x11/configure.ac
+++ b/x11/configure.ac
@@ -59,7 +59,6 @@ AC_SUBST(MH_EXTRA_LIBS)
 MH_CHECK_CC_O
 
 dnl Checks for library functions.
-AC_TYPE_SIGNAL
 AC_CHECK_FUNCS(vsscanf usleep poll vsnprintf)
 
 dnl Check for X includes and X libraries
diff --git a/x11/pdcx11.h b/x11/pdcx11.h
index 68e86ba0..53c201ca 100644
--- a/x11/pdcx11.h
+++ b/x11/pdcx11.h
@@ -136,7 +136,7 @@ int XC_read_socket(int, void *, int);
 int XC_write_display_socket_int(int);
 
 int XCursesSetupX(int argc, char *argv[]);
-RETSIGTYPE XCursesSigwinchHandler(int signo);
+void XCursesSigwinchHandler(int signo);
 
 #ifdef _HPUX_SOURCE
 # define FD_SET_CAST int *
@@ -161,7 +161,7 @@ extern int xc_display_sockets[2];
 extern int xc_key_sockets[2];
 extern int xc_exit_sock;
 
-typedef RETSIGTYPE (*signal_handler)();
+typedef void (*signal_handler)();
 
 signal_handler XCursesSetSignal(int, signal_handler);
 
diff --git a/x11/x11.c b/x11/x11.c
index a5231061..1cf75e09 100644
--- a/x11/x11.c
+++ b/x11/x11.c
@@ -531,7 +531,7 @@ signal_handler XCursesSetSignal(int signo, signal_handler action)
 #endif
 }
 
-RETSIGTYPE XCursesSigwinchHandler(int signo)
+void XCursesSigwinchHandler(int signo)
 {
     PDC_LOG(("%s:XCursesSigwinchHandler() - called: SIGNO: %d\n",
              XCLOGMSG, signo));
@@ -2797,7 +2797,7 @@ static void _handle_structure_notify(Widget w, XtPointer client_data,
     }
 }
 
-static RETSIGTYPE _handle_signals(int signo)
+static void _handle_signals(int signo)
 {
     int flag = CURSES_EXIT;