whoami.c - sbase - suckless unix tools
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       ---
       whoami.c (582B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include <errno.h>
            3 #include <stdio.h>
            4 #include <unistd.h>
            5 #include <pwd.h>
            6 
            7 #include "util.h"
            8 
            9 static void
           10 usage(void)
           11 {
           12         eprintf("usage: %s\n", argv0);
           13 }
           14 
           15 int
           16 main(int argc, char *argv[])
           17 {
           18         uid_t uid;
           19         struct passwd *pw;
           20 
           21         argv0 = *argv, argv0 ? (argc--, argv++) : (void *)0;
           22 
           23         if (argc)
           24                 usage();
           25 
           26         uid = geteuid();
           27         errno = 0;
           28         if (!(pw = getpwuid(uid))) {
           29                 if (errno)
           30                         eprintf("getpwuid %d:", uid);
           31                 else
           32                         eprintf("getpwuid %d: no such user\n", uid);
           33         }
           34         puts(pw->pw_name);
           35 
           36         return fshut(stdout, "<stdout>");
           37 }