#define _POSIX_C_SOURCE 201800 /* same as before */
#include <pwd.h>   /* getpwuid */
#include <stdio.h> /* printf */

int main()
{
    /* If we are interested in the ‹passwd› entry of a particular
     * user, we don't have to find it ourselves: the function
     * ‹getpwuid› (and ‹getpwnam›) can find it for us. In this case,
     * ‹getpwuid› will search by the numeric user id. Let's then
     * look up our own entry. */

    struct passwd *pw = getpwuid( getuid() );
    printf( "name: %s\n", pw->pw_name );
    printf( "uid: %d\n", pw->pw_uid );
    printf( "gid: %d\n", pw->pw_gid );
    printf( "home: %s\n", pw->pw_dir );
    printf( "shell: %s\n", pw->pw_shell );
    printf( "\n" );
}

/* Next: ‹getpwnam.c›. */