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/* $OpenBSD: lastcomm.c,v 1.20 2015/01/16 06:40:09 deraadt Exp $ */
/* $NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson Exp $ */
/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h> /* NODEV */
#include <sys/stat.h>
#include <sys/acct.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <struct.h>
#include <tzfile.h>
#include <unistd.h>
#include <utmp.h>
#include <pwd.h>
#include "pathnames.h"
time_t expand(u_int);
char *flagbits(int);
char *getdev(dev_t);
int requested(char *[], struct acct *);
void usage(void);
int
main(int argc, char *argv[])
{
char *p;
struct acct ab;
struct stat sb;
FILE *fp;
off_t size;
time_t t;
double delta;
int ch;
char *acctfile;
acctfile = _PATH_ACCT;
while ((ch = getopt(argc, argv, "f:")) != -1)
switch(ch) {
case 'f':
acctfile = optarg;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
/* Open the file. */
if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
err(1, "%s", acctfile);
/*
* Round off to integral number of accounting records, probably
* not necessary, but it doesn't hurt.
*/
size = sb.st_size - sb.st_size % sizeof(struct acct);
/* Check if any records to display. */
if (size < sizeof(struct acct))
exit(0);
/*
* Seek to before the last entry in the file; use lseek(2) in case
* the file is bigger than a "long".
*/
size -= sizeof(struct acct);
if (lseek(fileno(fp), size, SEEK_SET) == -1)
err(1, "%s", acctfile);
for (;;) {
if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
err(1, "%s", acctfile);
if (ab.ac_comm[0] == '\0') {
ab.ac_comm[0] = '?';
ab.ac_comm[1] = '\0';
} else
for (p = &ab.ac_comm[0];
p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
if (!isprint((unsigned char)*p))
*p = '?';
if (!*argv || requested(argv, &ab))
{
t = expand(ab.ac_utime) + expand(ab.ac_stime);
(void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
(int)fldsiz(acct, ac_comm),
(int)fldsiz(acct, ac_comm),
ab.ac_comm, flagbits(ab.ac_flag), UT_NAMESIZE,
UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty),
t / (double)AHZ, ctime(&ab.ac_btime));
delta = expand(ab.ac_etime) / (double)AHZ;
printf(" (%1.0f:%02.0f:%05.2f)\n",
delta / SECSPERHOUR,
fmod(delta, (double)SECSPERHOUR) / SECSPERMIN,
fmod(delta, (double)SECSPERMIN));
}
if (size == 0)
break;
/* seek to previous entry */
if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
err(1, "%s", acctfile);
size -= sizeof(struct acct);
}
exit(0);
}
time_t
expand(u_int t)
{
time_t nt;
nt = t & 017777;
t >>= 13;
while (t) {
t--;
nt <<= 3;
}
return (nt);
}
char *
flagbits(int f)
{
static char flags[20] = "-";
char *p;
#define BIT(flag, ch) if (f & flag) *p++ = ch
p = flags + 1;
BIT(ASU, 'S');
BIT(AFORK, 'F');
BIT(ACOMPAT, 'C');
BIT(ACORE, 'D');
BIT(AXSIG, 'X');
*p = '\0';
return (flags);
}
int
requested(char *argv[], struct acct *acp)
{
do {
if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
return (1);
if (!strcmp(getdev(acp->ac_tty), *argv))
return (1);
if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
return (1);
} while (*++argv);
return (0);
}
char *
getdev(dev_t dev)
{
static dev_t lastdev = (dev_t)-1;
static char *lastname;
if (dev == NODEV) /* Special case. */
return ("__");
if (dev == lastdev) /* One-element cache. */
return (lastname);
lastdev = dev;
if ((lastname = devname(dev, S_IFCHR)) == NULL)
lastname = "??";
return (lastname);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n");
exit(1);
}
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