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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /login/utmp_file.c
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'login/utmp_file.c')
-rw-r--r--login/utmp_file.c499
1 files changed, 0 insertions, 499 deletions
diff --git a/login/utmp_file.c b/login/utmp_file.c
deleted file mode 100644
index 871c856071..0000000000
--- a/login/utmp_file.c
+++ /dev/null
@@ -1,499 +0,0 @@
-/* Copyright (C) 1996-2002, 2003, 2004, 2007 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <utmp.h>
-#include <not-cancel.h>
-
-#include "utmp-private.h"
-#include "utmp-equal.h"
-
-
-/* Descriptor for the file and position. */
-static int file_fd = -1;
-static off64_t file_offset;
-
-/* Cache for the last read entry. */
-static struct utmp last_entry;
-
-
-/* Locking timeout. */
-#ifndef TIMEOUT
-# define TIMEOUT 1
-#endif
-
-/* Do-nothing handler for locking timeout. */
-static void timeout_handler (int signum) {};
-
-/* LOCK_FILE(fd, type) failure_statement
- attempts to get a lock on the utmp file referenced by FD. If it fails,
- the failure_statement is executed, otherwise it is skipped.
- LOCKING_FAILED()
- jumps into the UNLOCK_FILE macro and ensures cleanup of LOCK_FILE.
- UNLOCK_FILE(fd)
- unlocks the utmp file referenced by FD and performs the cleanup of
- LOCK_FILE.
- */
-#define LOCK_FILE(fd, type) \
-{ \
- struct flock fl; \
- struct sigaction action, old_action; \
- unsigned int old_timeout; \
- \
- /* Cancel any existing alarm. */ \
- old_timeout = alarm (0); \
- \
- /* Establish signal handler. */ \
- action.sa_handler = timeout_handler; \
- __sigemptyset (&action.sa_mask); \
- action.sa_flags = 0; \
- __sigaction (SIGALRM, &action, &old_action); \
- \
- alarm (TIMEOUT); \
- \
- /* Try to get the lock. */ \
- memset (&fl, '\0', sizeof (struct flock)); \
- fl.l_type = (type); \
- fl.l_whence = SEEK_SET; \
- if (fcntl_not_cancel ((fd), F_SETLKW, &fl) < 0)
-
-#define LOCKING_FAILED() \
- goto unalarm_return
-
-#define UNLOCK_FILE(fd) \
- /* Unlock the file. */ \
- fl.l_type = F_UNLCK; \
- fcntl_not_cancel ((fd), F_SETLKW, &fl); \
- \
- unalarm_return: \
- /* Reset the signal handler and alarm. We must reset the alarm \
- before resetting the handler so our alarm does not generate a \
- spurious SIGALRM seen by the user. However, we cannot just set \
- the user's old alarm before restoring the handler, because then \
- it's possible our handler could catch the user alarm's SIGARLM \
- and then the user would never see the signal he expected. */ \
- alarm (0); \
- __sigaction (SIGALRM, &old_action, NULL); \
- if (old_timeout != 0) \
- alarm (old_timeout); \
-} while (0)
-
-
-/* Functions defined here. */
-static int setutent_file (void);
-static int getutent_r_file (struct utmp *buffer, struct utmp **result);
-static int getutid_r_file (const struct utmp *key, struct utmp *buffer,
- struct utmp **result);
-static int getutline_r_file (const struct utmp *key, struct utmp *buffer,
- struct utmp **result);
-static struct utmp *pututline_file (const struct utmp *data);
-static void endutent_file (void);
-static int updwtmp_file (const char *file, const struct utmp *utmp);
-
-/* Jump table for file functions. */
-const struct utfuncs __libc_utmp_file_functions =
-{
- setutent_file,
- getutent_r_file,
- getutid_r_file,
- getutline_r_file,
- pututline_file,
- endutent_file,
- updwtmp_file
-};
-
-
-#ifndef TRANSFORM_UTMP_FILE_NAME
-# define TRANSFORM_UTMP_FILE_NAME(file_name) (file_name)
-#endif
-
-static int
-setutent_file (void)
-{
- if (file_fd < 0)
- {
- const char *file_name;
- int result;
-
- file_name = TRANSFORM_UTMP_FILE_NAME (__libc_utmp_file_name);
-
- file_fd = open_not_cancel_2 (file_name, O_RDWR | O_LARGEFILE);
- if (file_fd == -1)
- {
- /* Hhm, read-write access did not work. Try read-only. */
- file_fd = open_not_cancel_2 (file_name, O_RDONLY | O_LARGEFILE);
- if (file_fd == -1)
- return 0;
- }
-
- /* We have to make sure the file is `closed on exec'. */
- result = fcntl_not_cancel (file_fd, F_GETFD, 0);
- if (result >= 0)
- result = fcntl_not_cancel (file_fd, F_SETFD, result | FD_CLOEXEC);
- if (result == -1)
- {
- close_not_cancel_no_status (file_fd);
- return 0;
- }
- }
-
- __lseek64 (file_fd, 0, SEEK_SET);
- file_offset = 0;
-
- /* Make sure the entry won't match. */
-#if _HAVE_UT_TYPE - 0
- last_entry.ut_type = -1;
-#else
- last_entry.ut_line[0] = '\177';
-# if _HAVE_UT_ID - 0
- last_entry.ut_id[0] = '\0';
-# endif
-#endif
-
- return 1;
-}
-
-
-static int
-getutent_r_file (struct utmp *buffer, struct utmp **result)
-{
- ssize_t nbytes;
-
- assert (file_fd >= 0);
-
- if (file_offset == -1l)
- {
- /* Not available. */
- *result = NULL;
- return -1;
- }
-
- LOCK_FILE (file_fd, F_RDLCK)
- {
- nbytes = 0;
- LOCKING_FAILED ();
- }
-
- /* Read the next entry. */
- nbytes = read_not_cancel (file_fd, &last_entry, sizeof (struct utmp));
-
- UNLOCK_FILE (file_fd);
-
- if (nbytes != sizeof (struct utmp))
- {
- if (nbytes != 0)
- file_offset = -1l;
- *result = NULL;
- return -1;
- }
-
- /* Update position pointer. */
- file_offset += sizeof (struct utmp);
-
- memcpy (buffer, &last_entry, sizeof (struct utmp));
- *result = buffer;
-
- return 0;
-}
-
-
-static int
-internal_getut_r (const struct utmp *id, struct utmp *buffer)
-{
- int result = -1;
-
- LOCK_FILE (file_fd, F_RDLCK)
- LOCKING_FAILED ();
-
-#if _HAVE_UT_TYPE - 0
- if (id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
- || id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)
- {
- /* Search for next entry with type RUN_LVL, BOOT_TIME,
- OLD_TIME, or NEW_TIME. */
-
- while (1)
- {
- /* Read the next entry. */
- if (read_not_cancel (file_fd, buffer, sizeof (struct utmp))
- != sizeof (struct utmp))
- {
- __set_errno (ESRCH);
- file_offset = -1l;
- goto unlock_return;
- }
- file_offset += sizeof (struct utmp);
-
- if (id->ut_type == buffer->ut_type)
- break;
- }
- }
- else
-#endif /* _HAVE_UT_TYPE */
- {
- /* Search for the next entry with the specified ID and with type
- INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS. */
-
- while (1)
- {
- /* Read the next entry. */
- if (read_not_cancel (file_fd, buffer, sizeof (struct utmp))
- != sizeof (struct utmp))
- {
- __set_errno (ESRCH);
- file_offset = -1l;
- goto unlock_return;
- }
- file_offset += sizeof (struct utmp);
-
- if (__utmp_equal (buffer, id))
- break;
- }
- }
-
- result = 0;
-
-unlock_return:
- UNLOCK_FILE (file_fd);
-
- return result;
-}
-
-
-/* For implementing this function we don't use the getutent_r function
- because we can avoid the reposition on every new entry this way. */
-static int
-getutid_r_file (const struct utmp *id, struct utmp *buffer,
- struct utmp **result)
-{
- assert (file_fd >= 0);
-
- if (file_offset == -1l)
- {
- *result = NULL;
- return -1;
- }
-
- if (internal_getut_r (id, &last_entry) < 0)
- {
- *result = NULL;
- return -1;
- }
-
- memcpy (buffer, &last_entry, sizeof (struct utmp));
- *result = buffer;
-
- return 0;
-}
-
-
-/* For implementing this function we don't use the getutent_r function
- because we can avoid the reposition on every new entry this way. */
-static int
-getutline_r_file (const struct utmp *line, struct utmp *buffer,
- struct utmp **result)
-{
- assert (file_fd >= 0);
-
- if (file_offset == -1l)
- {
- *result = NULL;
- return -1;
- }
-
- LOCK_FILE (file_fd, F_RDLCK)
- {
- *result = NULL;
- LOCKING_FAILED ();
- }
-
- while (1)
- {
- /* Read the next entry. */
- if (read_not_cancel (file_fd, &last_entry, sizeof (struct utmp))
- != sizeof (struct utmp))
- {
- __set_errno (ESRCH);
- file_offset = -1l;
- *result = NULL;
- goto unlock_return;
- }
- file_offset += sizeof (struct utmp);
-
- /* Stop if we found a user or login entry. */
- if (
-#if _HAVE_UT_TYPE - 0
- (last_entry.ut_type == USER_PROCESS
- || last_entry.ut_type == LOGIN_PROCESS)
- &&
-#endif
- !strncmp (line->ut_line, last_entry.ut_line, sizeof line->ut_line))
- break;
- }
-
- memcpy (buffer, &last_entry, sizeof (struct utmp));
- *result = buffer;
-
-unlock_return:
- UNLOCK_FILE (file_fd);
-
- return ((*result == NULL) ? -1 : 0);
-}
-
-
-static struct utmp *
-pututline_file (const struct utmp *data)
-{
- struct utmp buffer;
- struct utmp *pbuf;
- int found;
-
- assert (file_fd >= 0);
-
- /* Find the correct place to insert the data. */
- if (file_offset > 0
- && (
-#if _HAVE_UT_TYPE - 0
- (last_entry.ut_type == data->ut_type
- && (last_entry.ut_type == RUN_LVL
- || last_entry.ut_type == BOOT_TIME
- || last_entry.ut_type == OLD_TIME
- || last_entry.ut_type == NEW_TIME))
- ||
-#endif
- __utmp_equal (&last_entry, data)))
- found = 1;
- else
- found = internal_getut_r (data, &buffer);
-
- LOCK_FILE (file_fd, F_WRLCK)
- {
- pbuf = NULL;
- LOCKING_FAILED ();
- }
-
- if (found < 0)
- {
- /* We append the next entry. */
- file_offset = __lseek64 (file_fd, 0, SEEK_END);
- if (file_offset % sizeof (struct utmp) != 0)
- {
- file_offset -= file_offset % sizeof (struct utmp);
- __ftruncate64 (file_fd, file_offset);
-
- if (__lseek64 (file_fd, 0, SEEK_END) < 0)
- {
- pbuf = NULL;
- goto unlock_return;
- }
- }
- }
- else
- {
- /* We replace the just read entry. */
- file_offset -= sizeof (struct utmp);
- __lseek64 (file_fd, file_offset, SEEK_SET);
- }
-
- /* Write the new data. */
- if (write_not_cancel (file_fd, data, sizeof (struct utmp))
- != sizeof (struct utmp))
- {
- /* If we appended a new record this is only partially written.
- Remove it. */
- if (found < 0)
- (void) __ftruncate64 (file_fd, file_offset);
- pbuf = NULL;
- }
- else
- {
- file_offset += sizeof (struct utmp);
- pbuf = (struct utmp *) data;
- }
-
- unlock_return:
- UNLOCK_FILE (file_fd);
-
- return pbuf;
-}
-
-
-static void
-endutent_file (void)
-{
- assert (file_fd >= 0);
-
- close_not_cancel_no_status (file_fd);
- file_fd = -1;
-}
-
-
-static int
-updwtmp_file (const char *file, const struct utmp *utmp)
-{
- int result = -1;
- off64_t offset;
- int fd;
-
- /* Open WTMP file. */
- fd = open_not_cancel_2 (file, O_WRONLY | O_LARGEFILE);
- if (fd < 0)
- return -1;
-
- LOCK_FILE (fd, F_WRLCK)
- LOCKING_FAILED ();
-
- /* Remember original size of log file. */
- offset = __lseek64 (fd, 0, SEEK_END);
- if (offset % sizeof (struct utmp) != 0)
- {
- offset -= offset % sizeof (struct utmp);
- __ftruncate64 (fd, offset);
-
- if (__lseek64 (fd, 0, SEEK_END) < 0)
- goto unlock_return;
- }
-
- /* Write the entry. If we can't write all the bytes, reset the file
- size back to the original size. That way, no partial entries
- will remain. */
- if (write_not_cancel (fd, utmp, sizeof (struct utmp))
- != sizeof (struct utmp))
- {
- __ftruncate64 (fd, offset);
- goto unlock_return;
- }
-
- result = 0;
-
-unlock_return:
- UNLOCK_FILE (fd);
-
- /* Close WTMP file. */
- close_not_cancel_no_status (fd);
-
- return result;
-}