Hi all,

I just want to know how to do the following.

Whenever a user logs in and logs out, the username and the login time and logout time should be written to a file.

Wrote a program to get it from utmp. It is printing something which i am not able to understand.

Thanks in advance for your help
-Nakul

Have you read 'man 5 utmp' and looked at the record structure? .. actually you're probably safer looking at utmp.h.

@kbp: It is giving something like
Code:
int main(void) {

while((utmp = getutent()) != NULL) {
printf("%s logged in at %d\n", utmp->ut_user, utmp->ut_time);
}
endutent();
return 0;
}

reboot logged in at 1337084828
runlevel logged in at 1337084828
logged in at 1337065065
logged in at 1337065065
logged in at 1337065065
logged in at 1337065065
LOGIN logged in at 1337065065
LOGIN logged in at 1337065065
logged in at 1337065065
logged in at 1337065065
root logged in at 1337065134
root logged in at 1337070419
root logged in at 1337090131
logged in at 1337075180
root logged in at 1337078936
root logged in at 1337090317
root logged in at 1337090333

If you look at /usr/include/bits/utmp.h you'll see that ut_time is actually defined as ut_tv.tv_sec:

So what you're getting is probably the time in seconds since epoch, you'll need to convert it to a date format.

Ideally you'd change your code to use the new value

Thanks kbp i achived it
tmp = ut->ut_tv.tv_sec;
printf("%s\n",ctime(&tmp));