more cleaning

simexec/simexec.c

@@ -0,0 +1,20 @@
+#include <stddef.h> /* NULL */
+#include <sysexits.h> /* EX_USAGE */
+#include <unistd.h> /* execv(3), write(2) */
+#include "libio.h" /* fdprint(3) */
+
+static char *program_name = "simexec";
+
+int main(int argc, char *argv[]){
+
+	if(argc < 2){
+		write(2, "Usage: ", 7);
+		if(argv[0] == NULL)
+			argv[0] = program_name;
+		fdprint(2, argv[0]);
+		write(2, " [pathname] [argv...]\n", 22);
+		return EX_USAGE;
+	}
+
+	return execv(argv[1], argv+2);
+}