blob: 59f9180c5442d9d75c75d9c82963b6753957c439 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
/* whoami.c - a simple implementation of whoami utility */
#include <pwd.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
int
who_am_i (void)
{
struct passwd *pw;
char *user = NULL;
pw = getpwuid (geteuid ());
if (pw)
user = pw->pw_name;
else if ((user = getenv ("USER")) == NULL)
{
fprintf (stderr, "I don't know!\n");
return 1;
}
printf ("%s\n", user);
return 0;
}
int
main (int argc, char **argv)
{
if (argc > 1)
{
fprintf (stderr, "usage: whoami\n");
return 1;
}
return who_am_i ();
}
|