$NetBSD: patch-fcgiwrap.c,v 1.1 2018/11/28 16:06:36 jperkin Exp $

1. Appease -Werror=implicit-fallthrough.

2/3/4/5. New `-l <limit>' option sets maximum number of CGI script
invocations per preforked fcgiwrap process.  Maximum total number of
CGI script invocations at any time is -c argument times -l argument.

--- fcgiwrap.c.orig	2013-02-03 13:25:17.000000000 +0000
+++ fcgiwrap.c
@@ -499,7 +499,7 @@ static void cgi_error(const char *messag
 	_exit(99);
 }
 
-static void handle_fcgi_request(void)
+static int handle_fcgi_request(void)
 {
 	int pipe_in[2];
 	int pipe_out[2];
@@ -553,7 +553,7 @@ static void handle_fcgi_request(void)
 
 			execl(filename, filename, (void *)NULL);
 			cgi_error("502 Bad Gateway", "Cannot execute script", filename);
-
+			break;
 		default: /* parent */
 			close(pipe_in[0]);
 			close(pipe_out[1]);
@@ -567,7 +567,7 @@ static void handle_fcgi_request(void)
 
 			fcgi_pass(&fc);
 	}
-	return;
+	return 0;
 
 err_fork:
 	close(pipe_err[0]);
@@ -585,17 +585,24 @@ err_pipein:
 
 	FCGI_puts("Status: 502 Bad Gateway\nContent-type: text/plain\n");
 	FCGI_puts("System error");
+	return -1;
 }
 
-static void fcgiwrap_main(void)
+static void fcgiwrap_main(unsigned nscriptmax)
 {
-	signal(SIGCHLD, SIG_IGN);
+	unsigned nscripts = 0;
+
+	signal(SIGCHLD, SIG_DFL);
 	signal(SIGPIPE, SIG_IGN);
 
 	inherited_environ = environ;
 
 	while (FCGI_Accept() >= 0) {
-		handle_fcgi_request();
+		if (handle_fcgi_request() == 0)
+			nscripts++;
+		while (waitpid(-1, NULL,
+			nscripts < nscriptmax ? WNOHANG : 0) != 0)
+			nscripts--;
 	}
 }
 
@@ -757,6 +764,7 @@ invalid_url:
 int main(int argc, char **argv)
 {
 	int nchildren = 1;
+	unsigned nscriptmax = INT_MAX;
 	char *socket_url = NULL;
 	int c;
 
@@ -781,6 +789,9 @@ int main(int argc, char **argv)
 			case 'c':
 				nchildren = atoi(optarg);
 				break;
+			case 'l':
+				nscriptmax = atoi(optarg);
+				break;
 			case 's':
 				socket_url = strdup(optarg);
 				break;
@@ -815,6 +826,6 @@ int main(int argc, char **argv)
 	}
 
 	prefork(nchildren);
-	fcgiwrap_main();
+	fcgiwrap_main(nscriptmax);
 	return 0;
 }