plugins.cpp: use popen2 with vfork for script plugins

src/gui/plugins.cpp

@@ -47,6 +47,8 @@
 #include <stdio.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
+#include <sys/types.h>
+#include <signal.h>
 
 #include <global.h>
 #include <neutrino.h>
@@ -313,6 +315,53 @@ void CPlugins::startPlugin(const char * const name)
 	else
 		printf("[CPlugins] could not find %s\n", name);
 
+}
+       #include <errno.h>
+
+FILE* popen2( pid_t& pid, const char *cmdstring, const char *type) {
+	int     pfd[2] ={-1,-1};
+	FILE    *fp = NULL;
+
+	/* only allow "r" or "w" */
+	if ((type[0] != 'r' && type[0] != 'w') || type[1] != 0) {
+		errno = EINVAL;     /* required by POSIX */
+		return(NULL);
+	}
+
+	if (pipe(pfd) < 0)
+		return(NULL);   /* errno set by pipe() */
+
+	if ((pid = vfork()) < 0) {
+		return(NULL);   /* errno set by vfork() */
+	} else if (pid == 0) {                           /* child */
+		if (*type == 'r') {
+			close(pfd[0]);
+			if (pfd[1] != STDOUT_FILENO) {
+				dup2(pfd[1], STDOUT_FILENO);
+				close(pfd[1]);
+			}
+		} else {
+			close(pfd[1]);
+			if (pfd[0] != STDIN_FILENO) {
+				dup2(pfd[0], STDIN_FILENO);
+				close(pfd[0]);
+			}
+		}
+		execl("/bin/sh", "sh", "-c", cmdstring, (char *)0);
+		exit(0);
+	 }
+
+	/* parent continues... */
+	if (*type == 'r') {
+		close(pfd[1]);
+		if ((fp = fdopen(pfd[0], type)) == NULL)
+			return(NULL);
+		} else {
+			close(pfd[0]);
+		if ((fp = fdopen(pfd[1], type)) == NULL)
+			return(NULL);
+	}
+	return(fp);
 }
 
 void CPlugins::startScriptPlugin(int number)
@@ -325,7 +374,8 @@ void CPlugins::startScriptPlugin(int number)
 		       script, plugin_list[number].cfgfile.c_str());
 		return;
 	}
-	FILE *f = popen(script,"r");
+	pid_t pid = 0;
+	FILE *f = popen2(pid,script,"r");
 	if (f != NULL)
 	{
 		char *output=NULL;
@@ -335,6 +385,7 @@ void CPlugins::startScriptPlugin(int number)
 		{
 			scriptOutput += output;
 		}
+		kill(pid, SIGINT );
 		pclose(f);
 		if(output)
 			free(output);