From 17aba36d295806dcb4f8fe53ccf2754274611843 Mon Sep 17 00:00:00 2001
From: Denis Monnerat <monnerat@u-pec.fr>
Date: Wed, 1 Oct 2025 15:07:46 +0200
Subject: [PATCH] ex1 td5

---
 td/td5/ex1.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 td/td5/ex1.c

diff --git a/td/td5/ex1.c b/td/td5/ex1.c
new file mode 100644
index 0000000..e768607
--- /dev/null
+++ b/td/td5/ex1.c
@@ -0,0 +1,47 @@
+#include <fcntl.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+#include <sys/wait.h>
+int main(int argc, char *argv[])
+{
+	pid_t p;
+	int t[2];
+	assert(pipe(t) == 0);
+
+	p = fork();
+
+	if (p == 0){
+		close(t[0]);
+		dup2(t[1],STDOUT_FILENO);
+		close(t[1]);
+		execlp("ls","ls",NULL);
+		assert(0);
+	}
+
+	p = fork();
+
+	if (p == 0){
+		int fd = open("output.txt",O_WRONLY|O_CREAT|O_APPEND,0644);
+		assert(fd != -1);
+
+		close(t[1]);
+		dup2(t[0],STDIN_FILENO);
+		close(t[0]);
+		dup2(fd,STDOUT_FILENO);
+		close(fd);
+		execlp("wc","wc",NULL);
+		assert(0);
+
+	}
+
+	close(t[0]);
+	close(t[1]);
+
+	wait(NULL);
+	wait(NULL);
+
+	return 0;
+}