diff options
Diffstat (limited to 'login/getutent_r.c')
| -rw-r--r-- | login/getutent_r.c | 211 |
1 files changed, 178 insertions, 33 deletions
diff --git a/login/getutent_r.c b/login/getutent_r.c index e355001..df9a797 100644 --- a/login/getutent_r.c +++ b/login/getutent_r.c @@ -1,51 +1,196 @@ /* Copyright (C) 1996 Free Software Foundation, Inc. -This file is part of the GNU C Library. -Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. + 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 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. + 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. */ + 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 <unistd.h> +#include <assert.h> +#include <db.h> +#include <fcntl.h> +#include <libc-lock.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> #include <utmp.h> +#include <gnu/lib-names.h> +#include <sys/stat.h> +#include "utmp-private.h" +#include "../elf/link.h" -int -__getutent_r (struct utmp **utmp, struct utmp_data *utmp_data) + +/* The various backends we have. */ +static int __setutent_unknown (int reset); +static int __getutent_r_unknown (struct utmp *buffer, struct utmp **result); +static void __pututline_unknown (const struct utmp *data); +static void __endutent_unknown (void); + + +/* We have three jump tables: unknown, db, or file. */ +static struct utfuncs unknown_functions = +{ + __setutent_unknown, + __getutent_r_unknown, + NULL, + NULL, + __pututline_unknown, + __endutent_unknown, + NULL +}; + +/* Currently selected backend. */ +struct utfuncs *__libc_utmp_jump_table = &unknown_functions; + +/* The tables from the services. */ +extern struct utfuncs __libc_utmp_db_functions; +extern struct utfuncs __libc_utmp_file_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) { - /* Open utmp file if not already done. */ - if (utmp_data->ut_fd == -1) + /* We have to test whether it is still not decided which backend to use. */ + assert (__libc_utmp_jump_table == &unknown_functions); + + /* See whether utmp db file exists. */ + if ((*__libc_utmp_db_functions.setutent) (reset)) + __libc_utmp_jump_table = &__libc_utmp_db_functions; + else { - setutent_r (utmp_data); - if (utmp_data->ut_fd == -1) - return -1; + /* Either the db file does not exist or we have other + problems. So use the normal file. */ + (*__libc_utmp_file_functions.setutent) (reset); + __libc_utmp_jump_table = &__libc_utmp_file_functions; } - /* Position file correctly. */ - if (lseek (utmp_data->ut_fd, utmp_data->loc_utmp, SEEK_SET) == -1) - return -1; + return 0; +} + - /* Read the next entry. */ - if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp)) - != sizeof (struct utmp)) - return -1; +void +__endutent (void) +{ + __libc_lock_lock (__libc_utmp_lock); + + (*__libc_utmp_jump_table->endutent) (); - /* Update position pointer. */ - utmp_data->loc_utmp += sizeof (struct utmp); + __libc_lock_unlock (__libc_utmp_lock); +} +weak_alias (__endutent, endutent) - *utmp = &utmp_data->ubuf; - return 0; +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); +} + + +void +__pututline (const struct utmp *data) +{ + __libc_lock_lock (__libc_utmp_lock); + + (*__libc_utmp_jump_table->pututline) (data); + + __libc_lock_unlock (__libc_utmp_lock); +} + + +static void +__pututline_unknown (const struct utmp *data) +{ + /* It is not yet initialized. */ + __setutent_unknown (0); + + (*__libc_utmp_jump_table->pututline) (data); +} + + +int +__utmpname (const char *file) +{ + int result = -1; + + __libc_lock_lock (__libc_utmp_lock); + + /* Close the old file. */ + (*__libc_utmp_jump_table->endutent) (); + + /* Store new names. */ + if ((*__libc_utmp_file_functions.utmpname) (file) == 0 + && !(*__libc_utmp_db_functions.utmpname) (file) == 0) + { + /* Try to find out whether we are supposed to work with a db + file or not. Do this by looking for the extension ".db". */ + const char *ext = strrchr (file, '.'); + + if (ext != NULL && strcmp (ext, ".db") == 0) + __libc_utmp_jump_table = &__libc_utmp_db_functions; + else + __libc_utmp_jump_table = &unknown_functions; + + result = 0; + } + + __libc_lock_unlock (__libc_utmp_lock); + + return result; +} +weak_alias (__utmpname, utmpname) |