use defines in /usr/include/utmp.h

[unix-history] / usr / src / lib / libutil / logout.c

/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)logout.c	5.3 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/file.h>
#include <sys/time.h>
#include <utmp.h>
#include <stdio.h>

/* 0 on failure, 1 on success */

logout(line)
	register char *line;
{
	register FILE *fp;
	struct utmp ut;
	int rval;
	time_t time();

	if (!(fp = fopen(_PATH_UTMP, "r+")))
		return(0);
	rval = 0;
	while (fread((char *)&ut, sizeof(struct utmp), 1, fp) == 1) {
		if (!ut.ut_name[0] ||
		    strncmp(ut.ut_line, line, sizeof(ut.ut_line)))
			continue;
		bzero(ut.ut_name, sizeof(ut.ut_name));
		bzero(ut.ut_host, sizeof(ut.ut_host));
		(void)time(&ut.ut_time);
		(void)fseek(fp, (long)-sizeof(struct utmp), L_INCR);
		(void)fwrite((char *)&ut, sizeof(struct utmp), 1, fp);
		(void)fseek(fp, (long)0, L_INCR);
		rval = 1;
	}
	(void)fclose(fp);
	return(rval);
}