diff options
Diffstat (limited to 'login/pututline_r.c')
| -rw-r--r-- | login/pututline_r.c | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/login/pututline_r.c b/login/pututline_r.c deleted file mode 100644 index 33ba96f461..0000000000 --- a/login/pututline_r.c +++ /dev/null @@ -1,133 +0,0 @@ -/* Copyright (C) 1996 Free Software Foundation, Inc. -This file is part of the GNU C Library. -Contributed by Ulrich Drepper <drepper@cygnus.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 <alloca.h> -#include <errno.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <utmp.h> -#include <sys/file.h> -#include <sys/stat.h> - - -/* XXX An alternative solution would be to call a SUID root program - which write the new value. */ - -int -__pututline_r (const struct utmp *id, struct utmp_data *utmp_data) -{ - struct stat st; - int result = 0; - -#if _HAVE_UT_TYPE - 0 - /* Test whether ID has any of the legal types because we have to - prevent illegal entries. */ - if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME - && id->ut_type != OLD_TIME && id->ut_type != NEW_TIME - && id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS - && id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS) - /* No, using '<' and '>' for the test is not possible. */ - { - __set_errno (EINVAL); - return -1; - } -#endif - - /* Open utmp file if not already done. */ - if (utmp_data->ut_fd == -1) - { - setutent_r (utmp_data); - if (utmp_data->ut_fd == -1) - return -1; - } - -#if _HAVE_UT_ID - 0 - /* Check whether we need to reposition. Repositioning is necessary - either if the data in UTMP_DATA is not valid or if the ids don't - match: */ - if (id->ut_id[0] - && (utmp_data->loc_utmp < (off_t) sizeof (struct utmp) - || strncmp (utmp_data->ubuf.ut_id, id->ut_id, - sizeof (id->ut_id)) != 0)) - { - /* We must not overwrite the data in UTMP_DATA since ID may be - aliasing it. */ - struct utmp_data *data_tmp = alloca (sizeof (*data_tmp)); - struct utmp *dummy; - - *data_tmp = *utmp_data; - utmp_data = data_tmp; - - if (getutid_r (id, &dummy, utmp_data) < 0 && errno != ESRCH) - return -1; - } -#endif - - /* Try to lock the file. */ - if (flock (utmp_data->ut_fd, LOCK_EX | LOCK_NB) < 0 && errno != ENOSYS) - { - /* Oh, oh. The file is already locked. Wait a bit and try again. */ - sleep (1); - - /* This time we ignore the error. */ - (void) flock (utmp_data->ut_fd, LOCK_EX | LOCK_NB); - } - - /* Find out how large the file is. */ - result = fstat (utmp_data->ut_fd, &st); - - if (result >= 0) - /* Position file correctly. */ - if (utmp_data->loc_utmp < (off_t) sizeof (struct utmp) - || (off_t) (utmp_data->loc_utmp - sizeof (struct utmp)) > st.st_size) - /* Not located at any valid entry. Add at the end. */ - { - result = lseek (utmp_data->ut_fd, 0L, SEEK_END); - if (result >= 0) - /* Where we'll be if the write succeeds. */ - utmp_data->loc_utmp = st.st_size + sizeof (struct utmp); - } - else - result = - lseek (utmp_data->ut_fd, utmp_data->loc_utmp - sizeof (struct utmp), - SEEK_SET); - - if (result >= 0) - /* Write the new data. */ - if (write (utmp_data->ut_fd, id, sizeof (struct utmp)) - != sizeof (struct utmp)) - { - /* If we appended a new record this is only partially written. - Remove it. */ - if (utmp_data->loc_utmp > st.st_size) - { - (void) ftruncate (utmp_data->ut_fd, st.st_size); - utmp_data->loc_utmp = st.st_size; - } - - result = -1; - } - - /* And unlock the file. */ - (void) flock (utmp_data->ut_fd, LOCK_UN); - - return result; -} -weak_alias (__pututline_r, pututline_r) |