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Diffstat (limited to 'src/whoami.c')
-rw-r--r-- | src/whoami.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/whoami.c b/src/whoami.c new file mode 100644 index 000000000..4a12406f1 --- /dev/null +++ b/src/whoami.c @@ -0,0 +1,49 @@ +/* whoami -- print effective userid + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Equivalent to `id -un'. */ +/* Written by Richard Mlynarik. */ + +#include <stdio.h> +#include <sys/types.h> +#include <pwd.h> +#include "system.h" + +void +main (argc, argv) + int argc; + char *argv[]; +{ + register struct passwd *pw; + register uid_t uid; + + if (argc != 1) + { + fprintf (stderr, "Usage: %s\n", argv[0]); + exit (1); + } + + uid = geteuid (); + pw = getpwuid (uid); + if (pw) + { + puts (pw->pw_name); + exit (0); + } + fprintf (stderr,"%s: cannot find username for UID %u\n", argv[0], uid); + exit (1); +} |