Import setuid.c

Import setuid.c from mariux64/mxtools repository.

setuid.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int main(int argc,char **argv) {
+	uid_t uid;
+	char *end;
+	int status;
+
+	if (argc<3) {
+		fprintf(stderr,"usage: %s uid cmd...\n",argv[0]);
+		exit(1);
+	}
+	uid=strtoul(argv[1],&end,10);
+	if (end==argv[1] || *end != '\0') {
+		fprintf(stderr,"%s: %s: invalid uid\n",argv[0],argv[1]);
+		exit(1);
+	}
+	status=setuid(uid);
+	if (status==-1) {
+		perror(argv[0]);
+		exit(1);
+	}
+
+	status=execvp(argv[2],&argv[2]);
+	if (status==-1) {
+		perror(argv[0]);
+		exit(1);
+	}
+	exit(0);
+}