From d4366c2eeb49a37cd50db3962d5489e453a1f18c Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Wed, 8 Nov 2023 13:26:46 +0200
Subject: [SP/P5] Added solutions to some exercises from today

---
 Year 3/System programming/Practicum5/ex2.c | 54 ++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Year 3/System programming/Practicum5/ex2.c

(limited to 'Year 3/System programming/Practicum5/ex2.c')

diff --git a/Year 3/System programming/Practicum5/ex2.c b/Year 3/System programming/Practicum5/ex2.c
new file mode 100644
index 0000000..88b337c
--- /dev/null
+++ b/Year 3/System programming/Practicum5/ex2.c	
@@ -0,0 +1,54 @@
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+	int f = open("test.txt", O_CREAT | O_WRONLY | O_TRUNC, 0755);
+	if (f < 0) {
+		perror("open test.txt");
+		return 2;
+	}
+
+	pid_t fpid = fork();
+
+	if (fpid < 0) {
+		perror("fork");
+		return 1;
+	}
+
+	if (fpid == 0) { // in child
+		sleep(2);
+		int ws = write(f, "From Child 1\n", 13);
+
+		if (ws < 0) {
+			perror("write from child");
+			return 3;
+		}
+
+		sleep(5);
+		ws = write(f, "From Child 2\n", 13);
+
+		if (ws < 0) {
+			perror("write from child");
+			return 3;
+		}
+	}
+	else {
+		int ws = write(f, "From Parent 1\n", 14);
+
+		if (ws < 0) {
+			perror("write from child");
+			return 3;
+		}
+
+		sleep(3);
+		ws = write(f, "From Parent 2\n", 14);
+
+		if (ws < 0) {
+			perror("write from child");
+			return 3;
+		}
+	}
+}
-- 
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