configure: remove use of RETSIGTYPE

This was previously defined by the obsolete AC_TYPE_SIGNAL macro,
which was removed in 2682e5f. The deprecation text says

> Your code may safely assume C89 semantics that RETSIGTYPE is void.

So, remove it and just use void instead.

Closes curl#6861

CMake/CurlTests.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -214,24 +214,6 @@ if (sizeof (bool *) )
 #include <float.h>
 int main() { return 0; }
 #endif
-#ifdef RETSIGTYPE_TEST
-#include <sys/types.h>
-#include <signal.h>
-#ifdef signal
-# undef signal
-#endif
-#ifdef __cplusplus
-extern "C" void (*signal (int, void (*)(int)))(int);
-#else
-void (*signal ()) ();
-#endif
-
-int
-main ()
-{
-  return 0;
-}
-#endif
 #ifdef HAVE_INET_NTOA_R_DECL
 #include <arpa/inet.h>
 

CMake/Platforms/WindowsCache.cmake

@@ -132,7 +132,6 @@ if(NOT UNIX)
       set(HAVE_GETADDRINFO 0)
     endif()
     set(STDC_HEADERS 1)
-    set(RETSIGTYPE_TEST 1)
 
     set(HAVE_SIGACTION 0)
     set(HAVE_MACRO_SIGSETJMP 0)

CMakeLists.txt

@@ -1108,7 +1108,6 @@ foreach(CURL_TEST
     HAVE_IN_ADDR_T
     HAVE_BOOL_T
     STDC_HEADERS
-    RETSIGTYPE_TEST
     HAVE_INET_NTOA_R_DECL
     HAVE_INET_NTOA_R_DECL_REENTRANT
     HAVE_GETADDRINFO
@@ -1209,12 +1208,6 @@ if(HAVE_FIONBIO OR
   set(HAVE_DISABLED_NONBLOCKING)
 endif()
 
-if(RETSIGTYPE_TEST)
-  set(RETSIGTYPE void)
-else()
-  set(RETSIGTYPE int)
-endif()
-
 if(CMAKE_COMPILER_IS_GNUCC AND APPLE)
   include(CheckCCompilerFlag)
   check_c_compiler_flag(-Wno-long-double HAVE_C_FLAG_Wno_long_double)

lib/Makefile.netware

@@ -5,8 +5,8 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 2004 - 2015, Guenter Knauf
-# Copyright (C) 2001 - 2020, Daniel Stenberg, <[email protected]>, et al.
+# Copyright (C) 2004 - 2015, 2021, Guenter Knauf
+# Copyright (C) 2001 - 2021, Daniel Stenberg, <[email protected]>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -599,7 +599,6 @@ endif
 	@echo $(DL)#define HAVE_UTIME 1$(DL) >> $@
 	@echo $(DL)#define HAVE_UTIME_H 1$(DL) >> $@
 	@echo $(DL)#define HAVE_WRITEV 1$(DL) >> $@
-	@echo $(DL)#define RETSIGTYPE void$(DL) >> $@
 	@echo $(DL)#define SIZEOF_INT 4$(DL) >> $@
 	@echo $(DL)#define SIZEOF_SHORT 2$(DL) >> $@
 	@echo $(DL)#define SIZEOF_STRUCT_IN_ADDR 4$(DL) >> $@

lib/config-amigaos.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -103,7 +103,6 @@
 #define PACKAGE_VERSION "-"
 #define CURL_CA_BUNDLE "s:curl-ca-bundle.crt"
 
-#define RETSIGTYPE void
 #define SELECT_TYPE_ARG1 int
 #define SELECT_TYPE_ARG234 (fd_set *)
 #define SELECT_TYPE_ARG5 (struct timeval *)

lib/config-dos.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -84,7 +84,6 @@
 
 #define NEED_MALLOC_H          1
 
-#define RETSIGTYPE             void
 #define SIZEOF_INT             4
 #define SIZEOF_LONG            4
 #define SIZEOF_LONG_DOUBLE     16

lib/config-mac.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -81,8 +81,6 @@
 #define HAVE_IOCTL              1
 #define HAVE_IOCTL_FIONBIO      1
 
-#define RETSIGTYPE void
-
 #define SIZEOF_INT              4
 #define SIZEOF_SHORT            2
 #define SIZEOF_SIZE_T           4

lib/config-os400.h

@@ -376,9 +376,6 @@
 /* Name of package */
 #undef PACKAGE
 
-/* Define as the return type of signal handlers (`int' or `void'). */
-#define RETSIGTYPE void
-
 /* The size of `int', as computed by sizeof. */
 #define SIZEOF_INT              4
 

lib/config-plan9.h

@@ -40,8 +40,6 @@
 #define RANDOM_FILE "/dev/random"
 #define VERSION "0.0.0" /* TODO */
 
-#define RETSIGTYPE void
-
 #define STDC_HEADERS 1
 
 #ifdef _BITS64

lib/config-riscos.h

@@ -353,9 +353,6 @@
 /* Name of package */
 #undef PACKAGE
 
-/* Define as the return type of signal handlers (`int' or `void'). */
-#define RETSIGTYPE void
-
 /* The size of `int', as computed by sizeof. */
 #define SIZEOF_INT 4
 

lib/config-tpf.h

@@ -578,9 +578,6 @@
 /* a suitable file to read random data from */
 /* #undef RANDOM_FILE */
 
-/* Define as the return type of signal handlers (`int' or `void'). */
-#define RETSIGTYPE void
-
 /* Define to the type of arg 1 for `select'. */
 #define SELECT_TYPE_ARG1 int
 

lib/config-vxworks.h

@@ -769,9 +769,6 @@
 /* Define to the function return type for recv. */
 #define RECV_TYPE_RETV int
 
-/* Define as the return type of signal handlers (`int' or `void'). */
-#define RETSIGTYPE void
-
 /* Define to the type qualifier of arg 5 for select. */
 #define SELECT_QUAL_ARG5
 

lib/config-win32.h

@@ -362,9 +362,6 @@
 /* Define if in_addr_t is not an available 'typedefed' type. */
 #define in_addr_t unsigned long
 
-/* Define to the return type of signal handlers (int or void). */
-#define RETSIGTYPE void
-
 /* Define if ssize_t is not an available 'typedefed' type. */
 #ifndef _SSIZE_T_DEFINED
 #  if (defined(__WATCOMC__) && (__WATCOMC__ >= 1240)) || \

lib/config-win32ce.h

@@ -307,9 +307,6 @@
 /* Define this if in_addr_t is not an available 'typedefed' type */
 #define in_addr_t unsigned long
 
-/* Define as the return type of signal handlers (int or void).  */
-#define RETSIGTYPE void
-
 /* Define ssize_t if it is not an available 'typedefed' type */
 #if (defined(__WATCOMC__) && (__WATCOMC__ >= 1240)) || defined(__POCC__)
 #elif defined(_WIN64)

lib/curl_config.h.cmake

@@ -876,9 +876,6 @@
 /* Define to the function return type for recv. */
 #cmakedefine RECV_TYPE_RETV ${RECV_TYPE_RETV}
 
-/* Define as the return type of signal handlers (`int' or `void'). */
-#cmakedefine RETSIGTYPE ${RETSIGTYPE}
-
 /* Define to the type qualifier of arg 5 for select. */
 #cmakedefine SELECT_QUAL_ARG5 ${SELECT_QUAL_ARG5}
 

lib/curl_setup_once.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -350,15 +350,6 @@ typedef int sig_atomic_t;
 #endif
 
 
-/*
- * Default return type for signal handlers.
- */
-
-#ifndef RETSIGTYPE
-#define RETSIGTYPE void
-#endif
-
-
 /*
  * Macro used to include code only in debug builds.
  */

lib/hostip.c

@@ -631,7 +631,7 @@ enum resolve_t Curl_resolv(struct Curl_easy *data,
  * within a signal handler which is nonportable and could lead to problems.
  */
 static
-RETSIGTYPE alarmfunc(int sig)
+void alarmfunc(int sig)
 {
   /* this is for "-ansi -Wall -pedantic" to stop complaining!   (rabe) */
   (void)sig;

packages/vms/config_h.com

@@ -28,7 +28,7 @@ $!
 $! This procedure may not guess the options correctly for all architectures,
 $! and is a work in progress.
 $!
-$! Copyright 2011 - 2020, John Malmberg
+$! Copyright 2011 - 2021, John Malmberg
 $!
 $! Permission to use, copy, modify, and/or distribute this software for any
 $! purpose with or without fee is hereby granted, provided that the above
@@ -1855,16 +1855,6 @@ $	    write tf "#endif"
 $	    goto cfgh_in_loop1
 $	endif
 $!
-$!	Process RETSIGTYPE directive
-$!----------------------------------
-$	if key2 .eqs. "RETSIGTYPE"
-$	then
-$	    write tf "#ifndef RETSIGTYPE"
-$	    write tf "#define RETSIGTYPE void"
-$	    write tf "#endif"
-$	    goto cfgh_in_loop1
-$	endif
-$!
 $!	Process STDC_HEADERS (SAMBA!)
 $!---------------------------
 $	if key2 .eqs. "STDC_HEADERS"

tests/server/util.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -543,7 +543,7 @@ long timediff(struct timeval newer, struct timeval older)
 
 /* vars used to keep around previous signal handlers */
 
-typedef RETSIGTYPE (*SIGHANDLER_T)(int);
+typedef void (*SIGHANDLER_T)(int);
 
 #ifdef SIGHUP
 static SIGHANDLER_T old_sighup_handler  = SIG_ERR;
@@ -591,7 +591,7 @@ HANDLE exit_event = NULL;
  * The first time this is called it will set got_exit_signal to one and
  * store in exit_signal the signal that triggered its execution.
  */
-static RETSIGTYPE exit_signal_handler(int signum)
+static void exit_signal_handler(int signum)
 {
   int old_errno = errno;
   logmsg("exit_signal_handler: %d", signum);