cmd/lastcomm/lastcomm.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1983-2000 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/acctctl.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include "lastcomm.h"

int
main(int argc, char *argv[])
{
    int res;
    int opt;
    char *filename = NULL;
    char buf[PATH_MAX];
    ea_file_t ef;
    int xflag = 0;

    while ((opt = getopt(argc, argv, "f:x")) != EOF) {
        switch (opt) {
        case 'f':
            filename = optarg;
            break;
        case 'x':
            xflag = 1;
            break;
        default:
            (void) fprintf(stderr,
                gettext("Usage:\tlastcomm [-x] [-f filename]"
                " [command] ... [user] ... [terminal] ...\n"));
            exit(2);
        }
    }

    if (xflag) {
        /*
         * User wants to see extended accounting statistics.
         */
        if (filename) {
            return (lc_exacct(filename, argc, argv, optind));
        } else {
            if (acctctl(AC_PROC | AC_FILE_GET, buf, PATH_MAX) < 0) {
                (void) fprintf(stderr, gettext("lastcomm: "
                    "cannot open extended accounting file: "
                    "%s\n"), strerror(errno));
                return (1);
            } else {
                return (lc_exacct(buf, argc, argv, optind));
            }
        }
    }
    if (filename == NULL) {
        /*
         * If no option is specified, then first try to open current
         * extended process accounting file and then old-style process
         * accounting.
         */
        if (acctctl(AC_PROC | AC_FILE_GET, buf, PATH_MAX) < 0)
            return (lc_pacct("/var/adm/pacct", argc, argv, optind));
        else
            return (lc_exacct(buf, argc, argv, optind));
    } else {
        /*
         * If accounting file was specified and we don't know its
         * format, then first try to open it as an extended accounting
         * file and then as an old-style accounting file.
         */
        if ((res = ea_open(&ef, filename, EXACCT_CREATOR,
            EO_TAIL | EO_VALID_HDR, O_RDONLY, 0)) >= 0)
            (void) ea_close(&ef);

        if (res < 0)
            return (lc_pacct(filename, argc, argv, optind));
        else
            return (lc_exacct(filename, argc, argv, optind));
    }
}