4.3BSD-Reno/src/usr.bin/whoami/whoami.c

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/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)whoami.c	5.4 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/types.h>
#include <pwd.h>

main()
{
	struct passwd *p, *getpwuid();
	uid_t uid;

	uid = geteuid();
	if (!(p = getpwuid(uid))) {
		printf("whoami: no login associated with uid %u.\n", uid);
		exit(1);
	}
	printf("%s\n", p->pw_name);
	exit(0);
}