From 65bdc35e6f82ba0fa0259166005263a1fc9795c9 Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Wed, 25 Oct 2023 11:02:02 +0300
Subject: [SP/P4] Solved all exercises

---
 Year 3/System programming/Practicum4/ex1.c | 11 +++++++++++
 Year 3/System programming/Practicum4/ex2.c | 18 ++++++++++++++++++
 Year 3/System programming/Practicum4/ex3.c | 13 +++++++++++++
 Year 3/System programming/Practicum4/ex4.c | 22 ++++++++++++++++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 Year 3/System programming/Practicum4/ex1.c
 create mode 100644 Year 3/System programming/Practicum4/ex2.c
 create mode 100644 Year 3/System programming/Practicum4/ex3.c
 create mode 100644 Year 3/System programming/Practicum4/ex4.c

(limited to 'Year 3/System programming/Practicum4')

diff --git a/Year 3/System programming/Practicum4/ex1.c b/Year 3/System programming/Practicum4/ex1.c
new file mode 100644
index 0000000..7958de4
--- /dev/null
+++ b/Year 3/System programming/Practicum4/ex1.c	
@@ -0,0 +1,11 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+	pid_t pid = getpid();
+	pid_t parentPID = getppid();
+
+	printf("Current: %d\nParent: %d\n", pid, parentPID);
+	execlp("ps", "ps", (char*)NULL);
+}
diff --git a/Year 3/System programming/Practicum4/ex2.c b/Year 3/System programming/Practicum4/ex2.c
new file mode 100644
index 0000000..579b247
--- /dev/null
+++ b/Year 3/System programming/Practicum4/ex2.c	
@@ -0,0 +1,18 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+	pid_t pid = getpid();
+	pid_t fpid = fork();
+	printf("own: %d\nfork: %d\n", pid, fpid);
+	if (fpid == 0) {
+		printf("parent: %d\n", getppid());
+	}
+	else if (fpid > 0) {
+		int childStatus;
+		wait(&childStatus);
+		printf("child exit status: %d\n", childStatus);
+	}
+}
diff --git a/Year 3/System programming/Practicum4/ex3.c b/Year 3/System programming/Practicum4/ex3.c
new file mode 100644
index 0000000..8df352b
--- /dev/null
+++ b/Year 3/System programming/Practicum4/ex3.c	
@@ -0,0 +1,13 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+	int status = -1;
+	int fpid = fork();
+	if (fpid == 0)
+		execl(argv[1], argv[1], (char*)NULL);
+	wait(&status);
+	printf("Exit status: %d\n", status);
+}
diff --git a/Year 3/System programming/Practicum4/ex4.c b/Year 3/System programming/Practicum4/ex4.c
new file mode 100644
index 0000000..3492784
--- /dev/null
+++ b/Year 3/System programming/Practicum4/ex4.c	
@@ -0,0 +1,22 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+	int f1 = fork();
+	int f2 = fork();
+	if (f1 == 0) {
+		execlp(argv[1], argv[1], (char*)NULL);
+	}
+	else if (f2 == 0) {
+		execlp(argv[2], argv[2], (char*)NULL);
+	}
+	else {
+		int firstStatus, secondStatus;
+		int firstEnded = wait(&firstStatus);
+		int secondEnded = wait(&secondStatus);
+		printf("%s %d\n", argv[1 + (firstEnded != f1)], firstStatus);
+		printf("%s %d\n", argv[1 + (secondEnded != f1)], secondStatus);
+	}
+}
-- 
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