init commit

3sem/seminars/l4/03.c

@@ -0,0 +1,39 @@
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <string.h>
+
+int
+main(int argc, char *argv[])
+{
+    struct stat st;
+
+    if (lstat(argv[1], &st) < 0) {
+        exit(1);
+    }
+
+    if (S_ISDIR(st.st_mode)) {
+        char *file = calloc(strlen(argv[1]) + 30, sizeof(char));
+
+        snprintf(file, strlen(argv[1]) + 30, "%s/%s.uid", argv[1], argv[0]);
+
+        sprintf(file, "%s/%s.uid", argv[1], argv[0]);
+
+        int fd = open(file, O_WRONLY | O_CREAT | O_TRUNC);
+        uid_t uid = getuid();
+        write(fd, &uid, sizeof(uid_t));
+
+        close(fd);
+    } else if (S_ISREG(st.st_mode)) {
+        int fd = open(argv[1], O_WRONLY | O_TRUNC);
+        write(fd, st.st_uid, sizeof(uid_t));
+
+        close(fd);
+    } else {
+        exit(1);
+    }
+}