add FITS.

guard.c

@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <errno.h>
+
+int child_killed = 0;
+pthread_t athread;
+
+void sighndlr(int sig){
+	printf("got signal %d\n", sig);
+	if(sig == SIGCHLD){
+		printf("Child was killed\n");
+		child_killed = 1;
+	}else if(sig == SIGSEGV){
+		printf("suicide\n");
+		pthread_exit(NULL);
+	}else
+		exit(sig);
+}
+
+void dummy(){
+	int i;
+	char *ptr = malloc(10000);
+	for(i = 0; i < 256; ++i, ptr += 1024){
+		*ptr += i;
+	}
+}
+
+pid_t create_child(){
+	child_killed = 0;
+	pid_t p = fork();
+	if(p == 0){
+		printf("child\n");
+		dummy();
+	}
+	return p;
+}
+
+void *thrfnctn(void *buf){
+	dummy();
+}
+
+int main(){
+	int i;
+	//for(i = 0; i < 255; ++i)
+	//	signal(i, sighndlr);
+	signal(SIGCHLD, sighndlr);
+	signal(SIGSEGV, sighndlr);
+	for(i = 0; i < 10; ++i){
+		pid_t p = create_child();
+		if(p){
+			printf("child #%d with PID %d\n", i, p);
+			while(!child_killed)
+				usleep(10000);
+		}else return 0;
+	}
+	for(i = 0; i < 10; ++i){
+		if(pthread_create(&athread, NULL, thrfnctn, NULL))
+			return -1;
+		printf("thread #%d\n", i);
+		while(pthread_kill(athread, 0) != ESRCH)
+			usleep(1000);
+		pthread_join(athread, NULL);
+	}
+	return 0;
+}
+