*

SCR3.1/devoir27/ex3/ex3.c

@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int ordre(int a, int b){
+	if (a < b)
+	    return 1;
+	else
+	    return 0;
+}
+
+int main(int argc, char** argv){
+	if (argc != 5){
+		printf("Usage : %s <entier1> <entier2> <entier3> <entier4>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+	pid_t x1, x2;
+	int p1[2], p2[2],tmp, a, b, c, d;
+	int x3 = strtod(argv[1], NULL), x4 = strtod(argv[2], NULL);
+	pipe(p1);
+	pipe(p2);
+	x1=fork();
+	x2=fork();
+	if (x1 > 0){
+		close(p1[0]);
+		write(p1[1],&x3, sizeof(int));
+		sleep(2);
+		write(p1[1],(int*) &x4, sizeof(int));
+		x3 = strtod(argv[3], NULL);
+		x4 = strtod(argv[4], NULL);
+		write(p2[1], &x3, sizeof(int));
+		sleep(2);
+		write(p2[1], &x3, sizeof(int));
+		close(p1[1]);
+		close(p2[1]);
+		dup(p1[0]);
+		read(p1[0], &a, sizeof(int));
+		sleep(2);
+		read(p1[0], &b, sizeof(int));
+		close(p1[0]);
+		dup(p2[0]);
+		read(p2[0], &c, sizeof(int));
+		sleep(2);
+		read(p2[0], &d, sizeof(int));
+		close(p2[0]);
+		printf("a = %d, b = %d, c = %d, d = %d\n", a, b, c, d);
+	}
+	if (x1 == 0){
+		close(p1[1]);
+		read(p1[0], &x3, sizeof(int));
+		sleep(2);
+		read(p1[0], &x4, sizeof(int));
+		if (!ordre(x3, x4)){
+			tmp = x4;
+			x4 = x3;
+			x3 = tmp;
+		}
+		printf("x3 = %d, x4 = %d", x3, x4);
+		close(p1[0]);
+		write(p1[1], &x3, sizeof(int));
+		sleep(2);
+		write(p1[1], &x4, sizeof(int));
+	}
+	if (x2 == 0){
+		close(p2[1]);
+		read(p2[0], &x3, sizeof(int));
+		sleep(2);
+		read(p2[0], &x4, sizeof(int));
+		ordre(x3, x4);
+		if (!ordre(x3, x4)){
+			tmp = x3;
+			x3 = x4;
+			x4 = x3;
+		}
+		dup(p2[1]);
+		close(p2[0]);
+		write(p2[1], &x3, sizeof(int));
+		sleep(2);
+		write(p2[1], &x4, sizeof(int));
+
+	}
+}
+
+
+