Changement exo 1.2 TP5

TP5/Exo1/exo1_2.c

@@ -1,46 +1,19 @@
+#define _GNU_SOURCE
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <assert.h>
-#include <fcntl.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-
+// ls -i -l /tmp >> log
+//
 int main(int argc, char *argv[])
 {
-    if (argc < 2)
-    {
-        printf("Usage: %s <file>\n", argv[0]);
-        return EXIT_FAILURE;
-    }
-
-    int pip, fd[2], outfile, d;
-    char buf;
-    pip = pipe(fd);
-    assert(pip != -1);
-
-    pid_t p = fork();
-    assert(p != -1);
-
-    outfile = open(argv[1], O_WRONLY | O_CREAT, 0644);
-
-    switch (p)
-    {
-    case 0:
-        close(fd[0]);
-        d = dup2(fd[1], 1);
-        execl("/usr/bin/ls", "ls", "-i", "-l", "/tmp", NULL);
-        close(fd[1]);
-        exit(0);
-    default:
-        close(fd[1]);
-        while (read(fd[0], &buf, sizeof(char)) > 0)
-        {
-            write(outfile, &buf, sizeof(char));
-        }
-        break;
-    }
-
-    close(outfile);
-    return EXIT_SUCCESS;
+	int redirection = open("./log",O_WRONLY | O_APPEND | O_CREAT , 0644);
+	assert(redirection >= 0);
+	// dup2 ferme 1, et duplique redirection
+	dup2(redirection,1);
+	close(redirection);
+	execlp("ls","ls","-i","-l","/tmp",NULL);
+	assert(0);
+	return 0;
 }