AuroraMiddleware/glibc
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2002-09-29  Bruno Haible  <bruno@clisp.org>

	* sysdeps/generic/utmp_file.c (LOCKING_FAILED): New macro.
	(UNLOCK_FILE): Add a label.
	(getutent_r_file, internal_getut_r, getutline_r_file, pututline_file,
	updwtmp_file): Shut off the alarm clock when locking failed.
This commit is contained in:
Ulrich Drepper 2002-09-30 22:30:11 +00:00
parent a3022b820f
commit e3b0b8baa1
2 changed files with 31 additions and 10 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2002-09-29 Bruno Haible <bruno@clisp.org>
* sysdeps/generic/utmp_file.c (LOCKING_FAILED): New macro.
(UNLOCK_FILE): Add a label.
(getutent_r_file, internal_getut_r, getutline_r_file, pututline_file,
updwtmp_file): Shut off the alarm clock when locking failed.
2002-09-30 Isamu Hasegawa <isamu@yamato.ibm.com>
* posix/regex_internal.h (re_match_context_t): Add a new member.

34
sysdeps/generic/utmp_file.c
View File

@ -47,6 +47,15 @@ static struct utmp last_entry;
/* 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; \
@ -70,11 +79,15 @@ static void timeout_handler (int signum) {};
fl.l_whence = SEEK_SET; \
if (__fcntl ((fd), F_SETLKW, &fl) < 0)
#define LOCKING_FAILED() \
goto unalarm_return
#define UNLOCK_FILE(fd) \
/* Unlock the file. */ \
fl.l_type = F_UNLCK; \
__fcntl ((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 \
@ -179,8 +192,8 @@ getutent_r_file (struct utmp *buffer, struct utmp **result)
LOCK_FILE (file_fd, F_RDLCK)
{
*result = NULL;
return -1;
nbytes = 0;
LOCKING_FAILED ();
}
/* Read the next entry. */
@ -190,7 +203,8 @@ getutent_r_file (struct utmp *buffer, struct utmp **result)
if (nbytes != sizeof (struct utmp))
{
file_offset = -1l;
if (nbytes != 0)
file_offset = -1l;
*result = NULL;
return -1;
}
@ -211,7 +225,7 @@ internal_getut_r (const struct utmp *id, struct utmp *buffer)
int result = -1;
LOCK_FILE (file_fd, F_RDLCK)
return result;
LOCKING_FAILED ();
#if _HAVE_UT_TYPE - 0
if (id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
@ -312,7 +326,7 @@ getutline_r_file (const struct utmp *line, struct utmp *buffer,
LOCK_FILE (file_fd, F_RDLCK)
{
*result = NULL;
return -1;
LOCKING_FAILED ();
}
while (1)
@ -375,7 +389,10 @@ pututline_file (const struct utmp *data)
found = internal_getut_r (data, &buffer);
LOCK_FILE (file_fd, F_WRLCK)
return NULL;
{
pbuf = NULL;
LOCKING_FAILED ();
}
if (found < 0)
{
@ -445,10 +462,7 @@ updwtmp_file (const char *file, const struct utmp *utmp)
return -1;
LOCK_FILE (fd, F_WRLCK)
{
__close (fd);
return result;
}
LOCKING_FAILED ();
/* Remember original size of log file. */
offset = __lseek64 (fd, 0, SEEK_END);