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[glibc.git] / login / getutid_r.c
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1 /* Copyright (C) 1996, 1997, 2001, 2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>
4 and Paul Janzen <pcj@primenet.com>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #include <bits/libc-lock.h>
22 #include <errno.h>
23 #include <stdlib.h>
24 #include <utmp.h>
26 #include "utmp-private.h"
29 /* We have to use the lock in getutent_r.c. */
30 __libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
32 /* The jump table is also in getutent_r.c. */
33 extern struct utfuncs *__libc_utmp_jump_table;
36 int
37 __getutid_r (const struct utmp *id, struct utmp *buffer, struct utmp **result)
39 #if (_HAVE_UT_ID - 0) && (_HAVE_UT_TYPE - 0)
40 int retval;
42 /* Test whether ID has any of the legal types. */
43 if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME
44 && id->ut_type != OLD_TIME && id->ut_type != NEW_TIME
45 && id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS
46 && id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)
47 /* No, using '<' and '>' for the test is not possible. */
49 __set_errno (EINVAL);
50 *result = NULL;
51 return -1;
54 __libc_lock_lock (__libc_utmp_lock);
56 retval = (*__libc_utmp_jump_table->getutid_r) (id, buffer, result);
58 __libc_lock_unlock (__libc_utmp_lock);
60 return retval;
61 #else /* !_HAVE_UT_ID && !_HAVE_UT_TYPE */
62 __set_errno (ENOSYS);
63 return -1;
64 #endif
66 weak_alias (__getutid_r, getutid_r)