Remove HAVE_SIGNAL_H

The `<signal.h>` header file is part of the standard C89 headers [1] and
on current systems can be included unconditionally.

Since file requires at least C89 or greater, the `HAVE_SIGNAL_H` symbol
defined by Autoconf in Zend.m4 [2] can be ommitted and simplifed.

The bundled libmagic (file) also ommits the usage of HAVE_SIGNAL_H since
5.35 however current version in PHP is very modified 5.34 version and
will be refactored separately. Check for HAVE_SIGNAL_H is therefore
still done in the configure.ac.

Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4

7 files changed, 6 insertions, 32 deletions

diff --git a/sapi/cgi/cgi_main.c b/sapi/cgi/cgi_main.c
index b22d37f89b..8a461d8c44 100644
--- a/sapi/cgi/cgi_main.c
+++ b/sapi/cgi/cgi_main.c
@@ -45,9 +45,7 @@
 # include <unistd.h>
 #endif
 
-#if HAVE_SIGNAL_H
-# include <signal.h>
-#endif
+#include <signal.h>
 
 #if HAVE_SETLOCALE
 # include <locale.h>
@@ -1779,7 +1777,6 @@ int main(int argc, char *argv[])
 	char *decoded_query_string;
 	int skip_getopt = 0;
 
-#ifdef HAVE_SIGNAL_H
 #if defined(SIGPIPE) && defined(SIG_IGN)
 	signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE in standalone mode so
 								that sockets created via fsockopen()
@@ -1788,7 +1785,6 @@ int main(int argc, char *argv[])
 								does that for us!  thies@thieso.net
 								20000419 */
 #endif
-#endif
 
 #ifdef ZTS
 	php_tsrm_startup();
diff --git a/sapi/cli/php_cli.c b/sapi/cli/php_cli.c
index 4333487a0b..364fd13106 100644
--- a/sapi/cli/php_cli.c
+++ b/sapi/cli/php_cli.c
@@ -46,9 +46,9 @@
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
-#if HAVE_SIGNAL_H
+
 #include <signal.h>
-#endif
+
 #if HAVE_SETLOCALE
 #include <locale.h>
 #endif
@@ -66,10 +66,6 @@
 #include "win32/php_registry.h"
 #endif
 
-#if HAVE_SIGNAL_H
-#include <signal.h>
-#endif
-
 #ifdef __riscos__
 #include <unixlib/local.h>
 #endif
@@ -1233,7 +1229,6 @@ int main(int argc, char *argv[])
 	}
 #endif
 
-#ifdef HAVE_SIGNAL_H
 #if defined(SIGPIPE) && defined(SIG_IGN)
 	signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE in standalone mode so
 								that sockets created via fsockopen()
@@ -1242,8 +1237,6 @@ int main(int argc, char *argv[])
 								does that for us!  thies@thieso.net
 								20000419 */
 #endif
-#endif
-
 
 #ifdef ZTS
 	php_tsrm_startup();
diff --git a/sapi/cli/php_cli_server.c b/sapi/cli/php_cli_server.c
index deb61816a7..c814b73f26 100644
--- a/sapi/cli/php_cli_server.c
+++ b/sapi/cli/php_cli_server.c
@@ -43,9 +43,7 @@
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
-#if HAVE_SIGNAL_H
 #include <signal.h>
-#endif
 #if HAVE_SETLOCALE
 #include <locale.h>
 #endif
@@ -2601,7 +2599,7 @@ int do_cli_server(int argc, char **argv) /* {{{ */
 				PHP_VERSION, buf, server_bind_address, document_root);
 	}
 
-#if defined(HAVE_SIGNAL_H) && defined(SIGINT)
+#if defined(SIGINT)
 	signal(SIGINT, php_cli_server_sigint_handler);
 	zend_signal_init();
 #endif
diff --git a/sapi/embed/php_embed.c b/sapi/embed/php_embed.c
index 4fcb181cc0..d651f6b491 100644
--- a/sapi/embed/php_embed.c
+++ b/sapi/embed/php_embed.c
@@ -159,7 +159,6 @@ EMBED_SAPI_API int php_embed_init(int argc, char **argv)
 {
 	zend_llist global_vars;
 
-#ifdef HAVE_SIGNAL_H
 #if defined(SIGPIPE) && defined(SIG_IGN)
 	signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE in standalone mode so
 								 that sockets created via fsockopen()
@@ -168,7 +167,6 @@ EMBED_SAPI_API int php_embed_init(int argc, char **argv)
 								 does that for us!  thies@thieso.net
 								 20000419 */
 #endif
-#endif
 
 #ifdef ZTS
   php_tsrm_startup();
diff --git a/sapi/fpm/fpm/fpm_main.c b/sapi/fpm/fpm/fpm_main.c
index 307c02ed7c..3c637d5990 100644
--- a/sapi/fpm/fpm/fpm_main.c
+++ b/sapi/fpm/fpm/fpm_main.c
@@ -43,9 +43,7 @@
 # include <unistd.h>
 #endif
 
-#if HAVE_SIGNAL_H
-# include <signal.h>
-#endif
+#include <signal.h>
 
 #if HAVE_SETLOCALE
 # include <locale.h>
@@ -1567,7 +1565,6 @@ int main(int argc, char *argv[])
 	zend_bool old_rc_debug;
 #endif
 
-#ifdef HAVE_SIGNAL_H
 #if defined(SIGPIPE) && defined(SIG_IGN)
 	signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE in standalone mode so
 								that sockets created via fsockopen()
@@ -1576,7 +1573,6 @@ int main(int argc, char *argv[])
 								does that for us!  thies@thieso.net
 								20000419 */
 #endif
-#endif
 
 #ifdef ZTS
 	php_tsrm_startup();
diff --git a/sapi/litespeed/lsapi_main.c b/sapi/litespeed/lsapi_main.c
index 2d8eb75326..4a6b1a0f3f 100644
--- a/sapi/litespeed/lsapi_main.c
+++ b/sapi/litespeed/lsapi_main.c
@@ -43,12 +43,7 @@
 
 #endif
 
-#if HAVE_SIGNAL_H
-
 #include <signal.h>
-
-#endif
-
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>
@@ -1228,11 +1223,9 @@ int main( int argc, char * argv[] )
     int slow_script_msec = 0;
     char time_buf[40];
 
-#ifdef HAVE_SIGNAL_H
 #if defined(SIGPIPE) && defined(SIG_IGN)
     signal(SIGPIPE, SIG_IGN);
 #endif
-#endif
 
 #ifdef ZTS
     php_tsrm_startup();
diff --git a/sapi/phpdbg/phpdbg.h b/sapi/phpdbg/phpdbg.h
index c2298037d4..d1b22e6f40 100644
--- a/sapi/phpdbg/phpdbg.h
+++ b/sapi/phpdbg/phpdbg.h
@@ -46,7 +46,7 @@
 #include "zend_ini_scanner.h"
 #include "zend_stream.h"
 #include "zend_signal.h"
-#if !defined(_WIN32) && !defined(ZEND_SIGNALS) && defined(HAVE_SIGNAL_H)
+#if !defined(_WIN32) && !defined(ZEND_SIGNALS)
 #	include <signal.h>
 #elif defined(PHP_WIN32)
 #	include "win32/signal.h"