Copy test of getpwuid from st - utmp - simple login manager  
  HTML git clone git://git.suckless.org/utmp
   DIR Log
   DIR Files
   DIR Refs
   DIR README
   DIR LICENSE
       ---
   DIR commit 9631182347109af70cc725aabd6d567c83e989ec
   DIR parent 5ac5ede22b55ec5820dbacf1c5e5e9d9c2b2d9ad
  HTML Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
       Date:   Thu, 28 Aug 2014 11:41:54 +0200
       
       Copy test of getpwuid from st
       
       This part of the code is identicall to the code of st, and st does
       better tests that utmp was doing, so we take the code of st.
       
       Diffstat:
         M utmp.c                              |      10 +++++++---
       
       1 file changed, 7 insertions(+), 3 deletions(-)
       ---
   DIR diff --git a/utmp.c b/utmp.c
       @@ -46,9 +46,13 @@ main(int argc, char *argv[])
                gid = getgid();
                setgid(gid);
        
       -        pw = getpwuid(uid = getuid());
       -        if (!pw || !pw->pw_name)
       -                die("Process is running with an incorrect uid %d", uid);
       +        errno = 0;
       +        if ((pw = getpwuid(uid = getuid())) == NULL) {
       +                if(errno)
       +                        die("getpwuid:%s", strerror(errno));
       +                else
       +                        die("who are you?");
       +        }
        
                setenv("LOGNAME", pw->pw_name, 1);
                setenv("USER", pw->pw_name, 1);