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add directory Linux-0.95

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gohigh
2024-02-19 00:21:03 -05:00
parent 059f8848b1
commit b6d98600bf
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114
Linux-0.95/sources/sbin/lastlogin.c Normal file
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/***************************************************************************
* Program: lastlogin (c)1987 ICUS Computer Group *
* By: Lenny Tropiano ...{ihnp4,mtune}!icus!lenny *
* *
* Program intent: This will allow programs like 'finger' and 'last' to *
* lookup in the file /usr/adm/lastlogin.log and see *
* when a particular user has logged-in. This saves *
* the necessity to keep /etc/wtmp around for a long *
* period of time. *
* *
* This program can be used/modified and redistributed *
* I declare it PUBLIC DOMAIN. Please give me credit *
* when credit is due. *
* *
* AT&T 3B1 compiling instructions for shared-libaries: *
* *
* $ cc -c -O lastlogin.c *
* $ ld -s -o lastlogin lastlogin.o /lib/shlib.ifile /lib/crt0s.o *
* $ mv lastlogin /etc *
* $ su *
* Password: *
* # chown adm /etc/lastlogin /usr/adm *
* # chgrp adm /etc/lastlogin /usr/adm *
* # chmod 4755 /etc/lastlogin *
* *
* Place a call to /etc/lastlogin in your /etc/localprofile *
* to be run on all user logins. *
***************************************************************************/
/***************************************************************************
* Linux compiling instructions: *
* *
* $ gcc -o lastlogin lastlogin.c utmp2.o *
* utmp2.o is compiled from poe-IGL (1.2) *
* $ mv lastlogin /etc *
* $ su *
* Password: *
* # chown adm /etc/lastlogin /usr/adm *
* # chgrp adm /etc/lastlogin /usr/adm *
* # chmod 4755 /etc/lastlogin *
* *
* Place a call to /etc/lastlogin in your /etc/profile *
* to be run on all user logins. *
* *
* B.Bergt@informatik.tu-chemnitz.de *
***************************************************************************/
/* Print the last login time and record the new time */
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <utmp.h>
#define LOGFILE "/usr/adm/lastlog"
main()
{
struct utmp *utent, *getutent();
int fd;
long hrs, min, sec;
struct lastlog {
char ll_line[8];
time_t ll_time;
} ll;
if (access(LOGFILE, 0) == -1) {
if ((fd = creat(LOGFILE,0644)) == -1) {
fprintf(stderr,"Cannot create file %s: ", LOGFILE);
perror("creat()");
exit(1);
}
} else {
if ((fd = open(LOGFILE,O_RDWR)) == -1) {
fprintf(stderr,"Cannot open file %s: ", LOGFILE);
perror("open()");
exit(1);
}
}
if (lseek(fd, (long)(getuid()*sizeof(struct lastlog)), 0) == -1) {
fprintf(stderr,"Cannot position file %s: ", LOGFILE);
perror("lseek()");
exit(1);
}
if (read(fd, (char *) &ll, sizeof ll) == sizeof ll &&
ll.ll_time != 0L) {
printf("Last login: %.*s on %.*s\n" , 19
, (char *) ctime(&ll.ll_time) , sizeof(ll.ll_line)
, ll.ll_line);
} else printf("Last login: [No Login information on record]\n");
sprintf(ll.ll_line, "%.8s", strrchr(ttyname(0), '/')+1);
setutent();
while ((utent = getutent()) != NULL)
if (strcmp(utent->ut_line, ll.ll_line) == 0)
break;
if (utent == NULL) {
fprintf(stderr,"Cannot locate utmp entry for tty\n");
exit(1);
}
ll.ll_time = utent->ut_time;
endutent();
lseek(fd, (long)(getuid()*sizeof(struct lastlog)), 0);
write(fd, (char *) &ll, sizeof ll);
close(fd);
exit(0);
}