Add id command from Tim Bird.

1 files changed, 56 insertions, 0 deletions

diff --git a/toys/id.c b/toys/id.c
new file mode 100644
index 00000000..f051189b
--- /dev/null
+++ b/toys/id.c
@@ -0,0 +1,56 @@
+/* vi: set sw=4 ts=4:
+ *
+ * id.c - print real and effective user and group IDs
+ *
+ * Copyright 2012 Sony Network Entertainment, Inc.
+ *
+ * by Tim Bird <tim.bird@am.sony.com>
+ *
+ * See http://www.opengroup.org/onlinepubs/009695399/utilities/id.html
+
+USE_ID(NEWTOY(id, "gru", TOYFLAG_BIN))
+
+config ID
+	bool "id"
+	default y
+	help
+	  usage: id [-gru]
+
+	  Print user and group ID.
+
+	  -g    Show only the effective group ID
+	  -r	Show real ID instead of effective ID
+	  -u    Show only the effective user ID
+*/
+
+#include "toys.h"
+
+#define FLAG_g (1<<2)
+#define FLAG_r (1<<1)
+#define FLAG_u 1
+
+void id_main(void)
+{
+	int flags = toys.optflags;
+
+	uid_t uid;
+	gid_t gid;
+
+	/* show effective, unless user specifies real */
+	uid = geteuid();
+	gid = getegid();
+
+	if (flags & FLAG_r) {
+		uid = getuid();
+		gid = getgid();
+	}
+	if (flags & FLAG_u) {
+	    printf("%d\n", uid);
+		return;
+	}
+	if (flags & FLAG_g) {
+		printf("%d\n", gid);
+		return;
+	}
+	printf("%d %d\n", uid, gid);
+}