Fix GH-10385: FPM successful config test early exit

This introduces an enum `fpm_init_return_status` to propagate the status
up to fpm_main. This also makes the code clearer by not using magic
integer return numbers.

Closes GH-10388

Author: nielsdos

NEWS

@@ -19,6 +19,7 @@ PHP                                                                        NEWS
 
 - FPM:
   . Fixed bug GH-10315 (FPM unknown child alert not valid). (Jakub Zelenka)
+  . Fixed bug GH-10385 (FPM successful config test early exit). (nielsdos)
 
 - Opcache:
   . Fix incorrect page_size check. (nielsdos)

sapi/fpm/fpm/fpm.c

@@ -41,7 +41,7 @@ struct fpm_globals_s fpm_globals = {
 	.send_config_pipe = {0, 0},
 };
 
-int fpm_init(int argc, char **argv, char *config, char *prefix, char *pid, int test_conf, int run_as_root, int force_daemon, int force_stderr) /* {{{ */
+enum fpm_init_return_status fpm_init(int argc, char **argv, char *config, char *prefix, char *pid, int test_conf, int run_as_root, int force_daemon, int force_stderr) /* {{{ */
 {
 	fpm_globals.argc = argc;
 	fpm_globals.argv = argv;
@@ -67,22 +67,22 @@ int fpm_init(int argc, char **argv, char *config, char *prefix, char *pid, int t
 	    0 > fpm_event_init_main()) {
 
 		if (fpm_globals.test_successful) {
-			exit(FPM_EXIT_OK);
+			return FPM_INIT_EXIT_OK;
 		} else {
 			zlog(ZLOG_ERROR, "FPM initialization failed");
-			return -1;
+			return FPM_INIT_ERROR;
 		}
 	}
 
 	if (0 > fpm_conf_write_pid()) {
 		zlog(ZLOG_ERROR, "FPM initialization failed");
-		return -1;
+		return FPM_INIT_ERROR;
 	}
 
 	fpm_stdio_init_final();
 	zlog(ZLOG_NOTICE, "fpm is running, pid %d", (int) fpm_globals.parent_pid);
 
-	return 0;
+	return FPM_INIT_CONTINUE;
 }
 /* }}} */
 

sapi/fpm/fpm/fpm.h

@@ -34,8 +34,14 @@
 #endif
 
 
+enum fpm_init_return_status {
+	FPM_INIT_ERROR,
+	FPM_INIT_CONTINUE,
+	FPM_INIT_EXIT_OK,
+};
+
 int fpm_run(int *max_requests);
-int fpm_init(int argc, char **argv, char *config, char *prefix, char *pid, int test_conf, int run_as_root, int force_daemon, int force_stderr);
+enum fpm_init_return_status fpm_init(int argc, char **argv, char *config, char *prefix, char *pid, int test_conf, int run_as_root, int force_daemon, int force_stderr);
 
 struct fpm_globals_s {
 	pid_t parent_pid;

sapi/fpm/fpm/fpm_main.c

@@ -1532,7 +1532,6 @@ int main(int argc, char *argv[])
 	int force_stderr = 0;
 	int php_information = 0;
 	int php_allow_to_run_as_root = 0;
-	int ret;
 #if ZEND_RC_DEBUG
 	bool old_rc_debug;
 #endif
@@ -1800,21 +1799,24 @@ consult the installation file that came with this distribution, or visit \n\
 	zend_rc_debug = 0;
 #endif
 
-	ret = fpm_init(argc, argv, fpm_config ? fpm_config : CGIG(fpm_config), fpm_prefix, fpm_pid, test_conf, php_allow_to_run_as_root, force_daemon, force_stderr);
+	enum fpm_init_return_status ret = fpm_init(argc, argv, fpm_config ? fpm_config : CGIG(fpm_config), fpm_prefix, fpm_pid, test_conf, php_allow_to_run_as_root, force_daemon, force_stderr);
 
 #if ZEND_RC_DEBUG
 	zend_rc_debug = old_rc_debug;
 #endif
 
-	if (ret < 0) {
-
+	if (ret == FPM_INIT_ERROR) {
 		if (fpm_globals.send_config_pipe[1]) {
 			int writeval = 0;
 			zlog(ZLOG_DEBUG, "Sending \"0\" (error) to parent via fd=%d", fpm_globals.send_config_pipe[1]);
 			zend_quiet_write(fpm_globals.send_config_pipe[1], &writeval, sizeof(writeval));
 			close(fpm_globals.send_config_pipe[1]);
 		}
-		return FPM_EXIT_CONFIG;
+		exit_status = FPM_EXIT_CONFIG;
+		goto out;
+	} else if (ret == FPM_INIT_EXIT_OK) {
+		exit_status = FPM_EXIT_OK;
+		goto out;
 	}
 
 	if (fpm_globals.send_config_pipe[1]) {