From 00dff9b1d9c3a20ce4b091e092d38f913479a5ac Mon Sep 17 00:00:00 2001
From: Stefan Zabka <zabkaste@hu-berlin.de>
Date: Wed, 13 May 2020 12:16:35 +0200
Subject: Added all given material for exercise 2

---
 02_exercise/beispiele/fork_signal/Makefile | 19 +++++++++++++++
 02_exercise/beispiele/fork_signal/fork.c   | 39 ++++++++++++++++++++++++++++++
 02_exercise/beispiele/fork_signal/signal.c | 21 ++++++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 02_exercise/beispiele/fork_signal/Makefile
 create mode 100644 02_exercise/beispiele/fork_signal/fork.c
 create mode 100644 02_exercise/beispiele/fork_signal/signal.c

(limited to '02_exercise/beispiele/fork_signal')

diff --git a/02_exercise/beispiele/fork_signal/Makefile b/02_exercise/beispiele/fork_signal/Makefile
new file mode 100644
index 0000000..499b8cb
--- /dev/null
+++ b/02_exercise/beispiele/fork_signal/Makefile
@@ -0,0 +1,19 @@
+#!/usr/bin/make
+.SUFFIXES:
+
+CFLAGS = -c -O0
+
+%.o: %.c
+	$(CC) $(CFLAGS) $^ -o $@
+
+%: %.o
+	$(CC) -o $@ $^
+
+all: fork signal
+
+run: all
+	./fork 10
+	./signal
+
+clean:
+	$(RM) $(RMFILES) fork signal
diff --git a/02_exercise/beispiele/fork_signal/fork.c b/02_exercise/beispiele/fork_signal/fork.c
new file mode 100644
index 0000000..b144577
--- /dev/null
+++ b/02_exercise/beispiele/fork_signal/fork.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main(int argc, const char* argv[]) {
+	pid_t pid;
+	int h;
+	int count;
+	
+	if (argc < 2) {
+		printf("Usage: ./fork process#\n");
+		return 0;
+	}
+	
+	count = atoi(argv[1]) - 1;
+	printf("Process#: %d\n", count + 1);
+	printf("Parent started\n");
+	
+	pid = 1;
+	for (h = 0; h < count; ++h) {
+		if ((pid = fork()) < 0)
+			printf("fork error\n");
+		else if (pid == 0) {
+			printf("Child %d started\n", h);
+			sleep(1);
+			printf("Child %d finished\n", h);
+			exit(0);
+		}
+	}
+	
+	printf("Parent waiting\n");
+	for (h = 0; h < count; ++h) {
+		wait(NULL);
+	}
+	printf("Parent finished\n");
+	return EXIT_SUCCESS;
+}
diff --git a/02_exercise/beispiele/fork_signal/signal.c b/02_exercise/beispiele/fork_signal/signal.c
new file mode 100644
index 0000000..500d2e1
--- /dev/null
+++ b/02_exercise/beispiele/fork_signal/signal.c
@@ -0,0 +1,21 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+
+void sig_handler(int signo) {
+	const char msg[] = "Speicherzugriffsfehler!\n";
+	write(2, msg, sizeof(msg) - 1);
+	exit(-1);
+}
+
+int main(void) {
+	if (signal(SIGSEGV, sig_handler) == SIG_ERR) {
+		perror("signal");
+		exit(-1);
+	}
+	
+	int array[1] = {0};
+	array[1000000] = 3;
+	return 0;
+}
-- 
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