From 04576dc2a3f761eb041b808b56f13a58052e7655 Mon Sep 17 00:00:00 2001
From: Stefan Zabka <zabkaste@hu-berlin.de>
Date: Sun, 24 May 2020 12:19:52 +0200
Subject: Moved back to 02_exercise

---
 02_exercise/beispiele/fork_example/Makefile | 18 +++++++++++++++
 02_exercise/beispiele/fork_example/fork.c   | 36 +++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 02_exercise/beispiele/fork_example/Makefile
 create mode 100644 02_exercise/beispiele/fork_example/fork.c

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

diff --git a/02_exercise/beispiele/fork_example/Makefile b/02_exercise/beispiele/fork_example/Makefile
new file mode 100644
index 0000000..8f69ed9
--- /dev/null
+++ b/02_exercise/beispiele/fork_example/Makefile
@@ -0,0 +1,18 @@
+#!/usr/bin/make
+.SUFFIXES:
+
+CFLAGS = -c -Os -Wall -Werror
+
+%.o: %.c
+	$(CC) $(CFLAGS) $^ -o $@
+
+%: %.o
+	$(CC) -o $@ $^
+
+all: fork
+
+run: all
+	./fork
+
+clean:
+	$(RM) $(RMFILES) fork
diff --git a/02_exercise/beispiele/fork_example/fork.c b/02_exercise/beispiele/fork_example/fork.c
new file mode 100644
index 0000000..7377b0f
--- /dev/null
+++ b/02_exercise/beispiele/fork_example/fork.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+int main(void) {
+	pid_t proc_id;
+	int status = 0;
+	
+	proc_id = fork();
+	
+	if (proc_id < 0) {
+		fprintf(stderr, "fork error\n");
+		fflush(stderr);
+		return EXIT_FAILURE;
+	}
+	
+	if (proc_id == 0) {
+		/* child process */
+		printf("[child]  process id: %d\n", (int) getpid());
+		
+		char* args[] = {"sleep", "1", NULL};
+		execvp(args[0], args);
+		exit(-1);
+	}
+	else {
+		/* parent */
+		printf("[parent] process id: %d\n", (int) getpid());
+		pid_t child_id = wait(&status);
+		
+		printf("[parent] child %d returned: %d\n",
+		        child_id, WEXITSTATUS(status));
+	}
+	
+	return EXIT_SUCCESS;
+}
-- 
cgit v1.2.3-54-g00ecf