shadow/libmisc/myname.c

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/*
* myname.c - determine the current username and get the passwd entry
*
* Copyright (C) 1996 Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>
*
* This code may be freely used, modified and distributed for any purpose.
* There is no warranty, if it breaks you have to keep both pieces, etc.
* If you improve it, please send me your changes. Thanks!
*/
#include <config.h>
#ident "$Id: myname.c,v 1.4 2005/08/31 17:24:57 kloczek Exp $"
#include "defines.h"
#include <pwd.h>
#include "prototypes.h"
struct passwd *get_my_pwent (void)
{
struct passwd *pw;
const char *cp = getlogin ();
uid_t ruid = getuid ();
/*
* Try getlogin() first - if it fails or returns a non-existent
* username, or a username which doesn't match the real UID, fall
* back to getpwuid(getuid()). This should work reasonably with
* usernames longer than the utmp limit (8 characters), as well as
* shared UIDs - but not both at the same time...
*
* XXX - when running from su, will return the current user (not
* the original user, like getlogin() does). Does this matter?
*/
if (cp && *cp && (pw = getpwnam (cp)) && pw->pw_uid == ruid)
return pw;
return getpwuid (ruid);
}