getutline (3) fails on a daemon process

[vadiraj <vadis.list@gmail.com>]

Hi List,

I'm trying to fetch userid using utmp.h API's. I'm able to get the
userid from the funciton getutline(3) on normal process. But the
same function while called by a daemon process it fails with perror
"no such process".

Any Idea why this is failing on a daemon process? 

here is the sudo code of the program I'm using.


    struct utmp *out_entry ;
    out_entry = calloc(1,sizeof(struct utmp));
    if(out_entry == NULL)
        return -1;

    strcpy (out_entry->ut_line,"pts/0") ;
    out_entry = getutline(out_entry) ;
    if(out_entry != NULL){
        strcpy(username,out_entry->ut_user) ;
        return 0;
    }
    

I have no alternate to get the username, other calls are of no fruit to
me. Only this call is of use to me and it does work on a normal process.
It fails only if the same code is run as a daemon process.


Thanks in advance


Regards,
Vadiraj