X-Git-Url: https://git.piment-noir.org/?p=TD_SE.git;a=blobdiff_plain;f=lockf%2Flockf.c;fp=lockf%2Flockf.c;h=f684b17b45029a3607a77f7a37d93d0811d11feb;hp=0000000000000000000000000000000000000000;hb=d71fd5f57f0aa66e9b19916626fea98b0b3bfc57;hpb=7fffbcc8e55a361a1098dc914c2460af69991760

diff --git a/lockf/lockf.c b/lockf/lockf.c
new file mode 100644
index 0000000..f684b17
--- /dev/null
+++ b/lockf/lockf.c
@@ -0,0 +1,39 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+int main() {
+    int i, fd = 1;
+
+    if (fork()) //il s'agit du père
+    {
+        lseek(fd, 0, 0);
+        if (lockf(fd, F_LOCK, 1) < 0) {
+            write(fd, "pere lockf failed\n", 18);
+            return -1;
+        }
+        for (i = 0; i < 5; i++) {
+            write(fd, "pere ecrit\n", 12);
+            sleep(1);
+        }
+        write(fd, "pere va liberer le verrou\n", 26);
+        lseek(fd, 0, 0);
+        lockf(fd, F_ULOCK, 0);
+        wait(NULL);
+    } else { //il s'agit du fils
+        lseek(fd, 0, 0); //verrouillé l'octet 0
+        if (lockf(fd, F_LOCK, 1) < 0) {
+            write(fd, "fils lockf failed\n", 18);
+            return -1;
+        }
+        for (i = 0; i < 4; i++) {
+            write(fd, "fils ecrit\n", 12);
+            sleep(1);
+        }
+        write(fd, "fils va liberer le verrou\n", 26);
+        lseek(fd, 0, 0);
+        lockf(fd, F_ULOCK, 0);
+    }
+    close(fd);
+    return 0;
+}