| /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com> |
| and Paul Janzen <pcj@primenet.com>, 1996. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include <assert.h> |
| #include <libc-lock.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <utmp.h> |
| |
| #include "utmp-private.h" |
| |
| |
| /* The various backends we have. */ |
| static int setutent_unknown (int reset); |
| static int getutent_r_unknown (struct utmp *buffer, struct utmp **result); |
| static struct utmp *pututline_unknown (const struct utmp *data); |
| static void endutent_unknown (void); |
| |
| /* Initial Jump table. */ |
| struct utfuncs __libc_utmp_unknown_functions = |
| { |
| setutent_unknown, |
| getutent_r_unknown, |
| NULL, |
| NULL, |
| pututline_unknown, |
| endutent_unknown, |
| NULL |
| }; |
| |
| /* Currently selected backend. */ |
| struct utfuncs *__libc_utmp_jump_table = &__libc_utmp_unknown_functions; |
| |
| /* We need to protect the opening of the file. */ |
| __libc_lock_define_initialized (, __libc_utmp_lock) |
| |
| |
| void |
| __setutent (void) |
| { |
| __libc_lock_lock (__libc_utmp_lock); |
| |
| (void) (*__libc_utmp_jump_table->setutent) (1); |
| |
| __libc_lock_unlock (__libc_utmp_lock); |
| } |
| weak_alias (__setutent, setutent) |
| |
| |
| static int |
| setutent_unknown (int reset) |
| { |
| /* We have to test whether it is still not decided which backend to use. */ |
| assert (__libc_utmp_jump_table == &__libc_utmp_unknown_functions); |
| |
| /* See whether utmpd is running. */ |
| if ((*__libc_utmp_daemon_functions.setutent) (reset)) |
| __libc_utmp_jump_table = &__libc_utmp_daemon_functions; |
| else |
| { |
| /* Use the normal file, but if the current file is _PATH_UTMP or |
| _PATH_WTMP and the corresponding extended file (with an extra |
| 'x' added to the pathname) exists, we use the extended file, |
| because the original file is in a different format. */ |
| if (strcmp (__libc_utmp_file_name, _PATH_UTMP) == 0 |
| && __access (_PATH_UTMP "x", F_OK) == 0) |
| __utmpname (_PATH_UTMP "x"); |
| else if (strcmp (__libc_utmp_file_name, _PATH_WTMP) == 0 |
| && __access (_PATH_WTMP "x", F_OK) == 0) |
| __utmpname (_PATH_WTMP "x"); |
| |
| (*__libc_utmp_file_functions.setutent) (reset); |
| __libc_utmp_jump_table = &__libc_utmp_file_functions; |
| } |
| |
| return 0; |
| } |
| |
| |
| void |
| __endutent (void) |
| { |
| __libc_lock_lock (__libc_utmp_lock); |
| |
| (*__libc_utmp_jump_table->endutent) (); |
| |
| __libc_lock_unlock (__libc_utmp_lock); |
| } |
| weak_alias (__endutent, endutent) |
| |
| |
| static void |
| endutent_unknown (void) |
| { |
| /* Huh, how do we came here? Nothing to do. */ |
| } |
| |
| |
| int |
| __getutent_r (struct utmp *buffer, struct utmp **result) |
| { |
| int retval; |
| |
| __libc_lock_lock (__libc_utmp_lock); |
| |
| retval = (*__libc_utmp_jump_table->getutent_r) (buffer, result); |
| |
| __libc_lock_unlock (__libc_utmp_lock); |
| |
| return retval; |
| } |
| weak_alias (__getutent_r, getutent_r) |
| |
| |
| static int |
| getutent_r_unknown (struct utmp *buffer, struct utmp **result) |
| { |
| /* It is not yet initialized. */ |
| setutent_unknown (0); |
| |
| return (*__libc_utmp_jump_table->getutent_r) (buffer, result); |
| } |
| |
| |
| struct utmp * |
| __pututline (const struct utmp *data) |
| { |
| struct utmp *buffer; |
| |
| __libc_lock_lock (__libc_utmp_lock); |
| |
| buffer = (*__libc_utmp_jump_table->pututline) (data); |
| |
| __libc_lock_unlock (__libc_utmp_lock); |
| |
| return buffer; |
| } |
| weak_alias (__pututline, pututline) |
| |
| |
| static struct utmp * |
| pututline_unknown (const struct utmp *data) |
| { |
| /* It is not yet initialized. */ |
| setutent_unknown (0); |
| |
| return (*__libc_utmp_jump_table->pututline) (data); |
| } |