init commit

3sem/cnts/contest12/02-ai.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+int
+run_command(char *cmd)
+{
+    pid_t pid = fork();
+    if (pid == -1) {
+        perror("fork");
+        exit(1);
+    } else if (pid == 0) {
+        execlp(cmd, cmd, (char *) NULL);
+        perror("execlp");
+        exit(1);
+    } else {
+        int status;
+        waitpid(pid, &status, 0);
+        if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+}
+
+int
+main(int argc, char *argv[])
+{
+    int cmd1_success = run_command(argv[1]);
+    int cmd2_success = 0;
+
+    if (!cmd1_success) {
+        cmd2_success = run_command(argv[2]);
+    }
+
+    if (cmd1_success || cmd2_success) {
+        if (run_command(argv[3])) {
+            exit(0);
+        } else {
+            exit(1);
+        }
+    }
+
+    exit(1);
+}