42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
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/*
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* myname.c - determine the current username and get the passwd entry
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*
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* Copyright (C) 1996 Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>
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*
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* This code may be freely used, modified and distributed for any purpose.
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* There is no warranty, if it breaks you have to keep both pieces, etc.
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* If you improve it, please send me your changes. Thanks!
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID("$Id: myname.c,v 1.2 1997/12/07 23:27:07 marekm Exp $")
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#include "defines.h"
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#include <pwd.h>
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#include "prototypes.h"
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struct passwd *
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get_my_pwent(void)
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{
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struct passwd *pw;
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const char *cp = getlogin();
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uid_t ruid = getuid();
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/*
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* Try getlogin() first - if it fails or returns a non-existent
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* username, or a username which doesn't match the real UID, fall
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* back to getpwuid(getuid()). This should work reasonably with
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* usernames longer than the utmp limit (8 characters), as well as
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* shared UIDs - but not both at the same time...
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*
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* XXX - when running from su, will return the current user (not
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* the original user, like getlogin() does). Does this matter?
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*/
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if (cp && *cp && (pw = getpwnam(cp)) && pw->pw_uid == ruid)
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return pw;
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return getpwuid(ruid);
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}
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