glibc/db2/log/log_get.c
Ulrich Drepper af69217fea Update.
1998-01-26 00:57  Ulrich Drepper  <drepper@cygnus.com>

	* db2/Makefile (routines): Add os_alloc.
	* db2/db.h: Update from db-2.3.16.
	* db2/db_185.h: Likewise.
	* db2/db_int.h: Likewise.
	* db2/btree/bt_close.c: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_page.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.c: Likewise.
	* db2/btree/btree_auto.c: Likewise.
	* db2/common/db_appinit.c: Likewise.
	* db2/common/db_apprec.c: Likewise.
	* db2/common/db_err.c: Likewise.
	* db2/common/db_region.c: Likewise.
	* db2/common/db_shash.c: Likewise.
	* db2/db/db.c: Likewise.
	* db2/db/db_auto.c: Likewise.
	* db2/db/db_conv.c: Likewise.
	* db2/db/db_dispatch.c: Likewise.
	* db2/db/db_dup.c: Likewise.
	* db2/db/db_pr.c: Likewise.
	* db2/db/db_rec.c: Likewise.
	* db2/db185/db185.c: Likewise.
	* db2/dbm/dbm.c: Likewise.
	* db2/hash/hash.c: Likewise.
	* db2/hash/hash_auto.c: Likewise.
	* db2/hash/hash_dup.c: Likewise.
	* db2/hash/hash_page.c: Likewise.
	* db2/hash/hash_rec.c: Likewise.
	* db2/include/btree_ext.h: Likewise.
	* db2/include/clib_ext.h: Likewise.
	* db2/include/common_ext.h: Likewise.
	* db2/include/db.h.src: Likewise.
	* db2/include/db_185.h.src: Likewise.
	* db2/include/db_am.h: Likewise.
	* db2/include/db_ext.h: Likewise.
	* db2/include/db_int.h.src: Likewise.
	* db2/include/hash_ext.h: Likewise.
	* db2/include/lock_ext.h: Likewise.
	* db2/include/log.h: Likewise.
	* db2/include/log_auto.h: Likewise.
	* db2/include/log_ext.h: Likewise.
	* db2/include/mp.h: Likewise.
	* db2/include/mp_ext.h: Likewise.
	* db2/include/mutex_ext.h: Likewise.
	* db2/include/os_ext.h: Likewise.
	* db2/include/os_func.h: Likewise.
	* db2/include/txn_ext.h: Likewise.
	* db2/lock/lock.c: Likewise.
	* db2/lock/lock_util.c: Likewise.
	* db2/log/log.c: Likewise.
	* db2/log/log.src: Likewise.
	* db2/log/log_archive.c: Likewise.
	* db2/log/log_auto.c: Likewise.
	* db2/log/log_get.c: Likewise.
	* db2/log/log_put.c: Likewise.
	* db2/log/log_rec.c: Likewise.
	* db2/log/log_register.c: Likewise.
	* db2/mp/mp_bh.c: Likewise.
	* db2/mp/mp_fget.c: Likewise.
	* db2/mp/mp_fopen.c: Likewise.
	* db2/mp/mp_fput.c: Likewise.
	* db2/mp/mp_pr.c: Likewise.
	* db2/mp/mp_sync.c: Likewise.
	* db2/mutex/mutex.c: Likewise.
	* db2/os/os_alloc.c: Likewise.
	* db2/os/os_config.c: Likewise.
	* db2/os/os_stat.c: Likewise.
	* db2/progs/db_checkpoint/db_checkpoint.c: Likewise.
	* db2/progs/db_deadlock/db_deadlock.c: Likewise.
	* db2/progs/db_load/db_load.c: Likewise.
	* db2/progs/db_printlog/db_printlog.c: Likewise.
	* db2/progs/db_recover/db_recover.c: Likewise.
	* db2/progs/db_stat/db_stat.c: Likewise.
	* db2/txn/txn.c: Likewise.

	* elf/dl-close.c (_dl_close): Rename inner variable named map to imap.
	Unmap memory blocks in reverse order of allocation.
	Call munmap with load address added to offset.
	Bug reported by Miguel de Icaza.

	* locale/programs/ld-collate.c (collate_end_weight): Correctly fill
	up weight array.

	* localedata/locales/cs_CZ: Update by Michael Mraka
	<michael@informatics.muni.cz>.

	* misc/sys/syslog.h: Reformat a bit.  Don't declare vsyslog unless
	__USE_BSD.

	* nis/nss_compat/compat-grp.c: Correctly handle buffer overflow while
	reading line with fgets.
	* nis/nss_compat/compat-pwd.c: Likewise.
	* nis/nss_compat/compat-spwd.c: Likewise.
	* nss/nss_files/files-XXX.c: Likewise.
	* nss/nss_files/files-alias.c: Likewise.
	* shadow/fgetspent_r.c: Likewise.

	* string/strerror_r.c: Correct comment.  Patch by Andreas Jaeger.

	* sysdeps/unix/sysv/linux/bits/stat.h: Define _STATBUF_ST_RDEV.
	* sysdeps/unix/sysv/linux/alpha/bits/stat.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/stat.h: Likewise.

	* sysdeps/unix/sysv/linux/i386/sys/ucontext.h: Allocate room for
	FP register content in ucontext_t.

1998-01-22  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/libm-ieee754/s_modfl.c (modf): Correct
	calculation.  Patch by Markus Schoder
	<Markus.Schoder@dresdner-bank.de>.

	* math/libm-test.c (modf_test): Add more tests for modf.

	* sysdeps/unix/sysv/linux/sys/mman.h: Add const to mlock and
	munlock according to Unix98.

1998-01-25  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* nss/nss_files/files-network.c (LINE_PARSER): Set n_addrtype to
	AF_INET.

1998-01-21 07:22  H.J. Lu  <hjl@gnu.org>

	* sysdeps/posix/ttyname.c: Handle symbolic links.
	* sysdeps/posix/ttyname_r.c: Ditto.

1998-01-25 19:39  Ulrich Drepper  <drepper@cygnus.com>

	* db2/makedb.c (process_input): Write terminating \0 for value.
	(print_database): Simply print value string, don't use length.

1998-01-24  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* nss/nsswitch.c (__nss_configure_lookup): Correct test for early
	exit of loop.

1998-01-25  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* nis/ypclnt.c: Don't set dom_client to NULL, or we will not
	close all sockets.

1998-01-25 14:54  Ulrich Drepper  <drepper@cygnus.com>

	* signal/Makefile (routines): Add sighold, sigrelse, sigignore, and
	sigset.
	* signal/sighold.c: New file.
	* signal/sigrelse.c: New file.
	* sysdeps/generic/sigignore.c: New file.
	* sysdeps/generic/sigset.c: New file.
	* sysdeps/posix/sigignore.c: New file.
	* sysdeps/posix/sigset.c: New file.
	* signal/signal.h: Add prototypes for new functions.

	* sysdeps/unix/sysv/linux/alpha/bits/signum.h: Define SIG_HOLD.
	* sysdeps/unix/sysv/linux/bits/signum.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/signum.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/signum.h: Likewise.

1998-01-23 00:16  Tim Waugh  <tim@cyberelk.demon.co.uk>

	* posix/wordexp.c: Added IFS field-splitting in parameter and
	command substitution.  Fixed an IFS-related bug that caused an
	infinite loop.

1998-01-25 12:38  Ulrich Drepper  <drepper@cygnus.com>

	* stdlib/Makefile (routines): Add getcontext, setcontext, makecontext,
	and swapcontext.
	* stdlib/ucontext.h: Correct prototypes.
	* sysdeps/generic/getcontext.c: New file.
	* sysdeps/generic/setcontext.c: New file.
	* sysdeps/generic/makecontext.c: New file.
	* sysdeps/generic/swapcontext.c: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc64/Makefile: Removed.

1998-01-25 04:07  Ulrich Drepper  <drepper@cygnus.com>

	* resource/sys/resource.h: Remove #include of ulimit.h which is
	not allowed by SUSv2 and not available on other systems.
	* sysdeps/unix/sysv/linux/ulimit.c: Include ulimit.h.

	* streams/Makefile: New file.
	* streams/stropts.h: New file.
	* sysdeps/generic/bits/stropts.h: New file.
	* sysdeps/generic/isastream.c: New file.
	* sysdeps/generic/getmsg.c: New file.
	* sysdeps/generic/getpmsg.c: New file.
	* sysdeps/generic/putmsg.c: New file.
	* sysdeps/generic/putpmsg.c: New file.
	* sysdeps/generic/fattach.c: New file.
	* sysdeps/generic/fdetach.c: New file.
	* sysdeps/unix/inet/Subdirs: Add streams.
	* sysdeps/generic/bits/types.h: Add definition of __t_scalar_t and
	__t_uscalar_t.
	* sysdeps/unix/sysv/linux/bits/types.h: Likewise.
	* sysdeps/unix/sysv/linux/alpha/bits/types.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/types.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/bits/types.h: Likewise.

	* sysdeps/mach/_strerror.c: Follow changes of generic version to
	handle small buffers correctly.

1998-01-24 17:31  H.J. Lu  <hjl@gnu.org>

	* sysdeps/alpha/dl-machine.h (ELF_MACHINE_RUNTIME_TRAMPOLINE):
	Remove the 3rd arg and add declaration for _dl_runtime_resolve
	and _dl_runtime_profile.

1998-01-25 02:42  Ulrich Drepper  <drepper@cygnus.com>

	* include/cpio.h: New file.  Mainly copied from GNU cpio.
	* posix/Makefile (headers): Add cpio.h.
1998-01-25 17:01:47 +00:00

341 lines
7.8 KiB
C

/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)log_get.c 10.24 (Sleepycat) 1/17/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "shqueue.h"
#include "db_page.h"
#include "log.h"
#include "hash.h"
#include "common_ext.h"
/*
* log_get --
* Get a log record.
*/
int
log_get(dblp, alsn, dbt, flags)
DB_LOG *dblp;
DB_LSN *alsn;
DBT *dbt;
int flags;
{
LOG *lp;
int ret;
/* Validate arguments. */
#define OKFLAGS (DB_CHECKPOINT | \
DB_CURRENT | DB_FIRST | DB_LAST | DB_NEXT | DB_PREV | DB_SET)
if ((ret = __db_fchk(dblp->dbenv, "log_get", flags, OKFLAGS)) != 0)
return (ret);
switch (flags) {
case DB_CHECKPOINT:
case DB_CURRENT:
case DB_FIRST:
case DB_LAST:
case DB_NEXT:
case DB_PREV:
case DB_SET:
break;
default:
return (__db_ferr(dblp->dbenv, "log_get", 1));
}
if (F_ISSET(dblp, DB_AM_THREAD)) {
if (LF_ISSET(DB_NEXT | DB_PREV | DB_CURRENT))
return (__db_ferr(dblp->dbenv, "log_get", 1));
if (!F_ISSET(dbt, DB_DBT_USERMEM | DB_DBT_MALLOC))
return (__db_ferr(dblp->dbenv, "threaded data", 1));
}
lp = dblp->lp;
LOCK_LOGREGION(dblp);
/*
* If we get one of the log's header records, repeat the operation.
* This assumes that applications don't ever request the log header
* records by LSN, but that seems reasonable to me.
*/
ret = __log_get(dblp, alsn, dbt, flags, 0);
if (ret == 0 && alsn->offset == 0) {
switch (flags) {
case DB_FIRST:
flags = DB_NEXT;
break;
case DB_LAST:
flags = DB_PREV;
break;
}
ret = __log_get(dblp, alsn, dbt, flags, 0);
}
UNLOCK_LOGREGION(dblp);
return (ret);
}
/*
* __log_get --
* Get a log record; internal version.
*
* PUBLIC: int __log_get __P((DB_LOG *, DB_LSN *, DBT *, int, int));
*/
int
__log_get(dblp, alsn, dbt, flags, silent)
DB_LOG *dblp;
DB_LSN *alsn;
DBT *dbt;
int flags, silent;
{
DB_LSN nlsn;
HDR hdr;
LOG *lp;
size_t len;
ssize_t nr;
int cnt, ret;
char *np, *tbuf;
const char *fail;
void *p, *shortp;
lp = dblp->lp;
fail = np = tbuf = NULL;
nlsn = dblp->c_lsn;
switch (flags) {
case DB_CHECKPOINT:
nlsn = lp->c_lsn;
if (IS_ZERO_LSN(nlsn)) {
__db_err(dblp->dbenv,
"log_get: unable to find checkpoint record: no checkpoint set.");
ret = ENOENT;
goto err2;
}
break;
case DB_NEXT: /* Next log record. */
if (!IS_ZERO_LSN(nlsn)) {
/* Increment the cursor by the cursor record size. */
nlsn.offset += dblp->c_len;
break;
}
/* FALLTHROUGH */
case DB_FIRST: /* Find the first log record. */
/* Find the first log file. */
if ((ret = __log_find(dblp, 1, &cnt)) != 0)
goto err2;
/*
* We may have only entered records in the buffer, and not
* yet written a log file. If no log files were found and
* there's anything in the buffer, it belongs to file 1.
*/
if (cnt == 0)
cnt = 1;
nlsn.file = cnt;
nlsn.offset = 0;
break;
case DB_CURRENT: /* Current log record. */
break;
case DB_PREV: /* Previous log record. */
if (!IS_ZERO_LSN(nlsn)) {
/* If at start-of-file, move to the previous file. */
if (nlsn.offset == 0) {
if (nlsn.file == 1 ||
__log_valid(dblp, NULL, nlsn.file - 1) != 0)
return (DB_NOTFOUND);
--nlsn.file;
nlsn.offset = dblp->c_off;
} else
nlsn.offset = dblp->c_off;
break;
}
/* FALLTHROUGH */
case DB_LAST: /* Last log record. */
nlsn.file = lp->lsn.file;
nlsn.offset = lp->lsn.offset - lp->len;
break;
case DB_SET: /* Set log record. */
nlsn = *alsn;
break;
}
retry:
/* Return 1 if the request is past end-of-file. */
if (nlsn.file > lp->lsn.file ||
(nlsn.file == lp->lsn.file && nlsn.offset >= lp->lsn.offset))
return (DB_NOTFOUND);
/* If we've switched files, discard the current fd. */
if (dblp->c_lsn.file != nlsn.file && dblp->c_fd != -1) {
(void)__db_close(dblp->c_fd);
dblp->c_fd = -1;
}
/* If the entire record is in the in-memory buffer, copy it out. */
if (nlsn.file == lp->lsn.file && nlsn.offset >= lp->w_off) {
/* Copy the header. */
p = lp->buf + (nlsn.offset - lp->w_off);
memcpy(&hdr, p, sizeof(HDR));
/* Copy the record. */
len = hdr.len - sizeof(HDR);
if ((ret = __db_retcopy(dbt, (u_int8_t *)p + sizeof(HDR),
len, &dblp->c_dbt.data, &dblp->c_dbt.ulen, NULL)) != 0)
goto err1;
goto cksum;
}
/* Acquire a file descriptor. */
if (dblp->c_fd == -1) {
if ((ret = __log_name(dblp, nlsn.file, &np)) != 0)
goto err1;
if ((ret = __db_open(np, DB_RDONLY | DB_SEQUENTIAL,
DB_RDONLY | DB_SEQUENTIAL, 0, &dblp->c_fd)) != 0) {
fail = np;
goto err1;
}
__db_free(np);
np = NULL;
}
/* Seek to the header offset and read the header. */
if ((ret = __db_seek(dblp->c_fd, 0, 0, nlsn.offset, SEEK_SET)) != 0) {
fail = "seek";
goto err1;
}
if ((ret = __db_read(dblp->c_fd, &hdr, sizeof(HDR), &nr)) != 0) {
fail = "read";
goto err1;
}
if (nr == sizeof(HDR))
shortp = NULL;
else {
/* If read returns EOF, try the next file. */
if (nr == 0) {
if (flags != DB_NEXT || nlsn.file == lp->lsn.file)
goto corrupt;
/* Move to the next file. */
++nlsn.file;
nlsn.offset = 0;
goto retry;
}
/*
* If read returns a short count the rest of the record has
* to be in the in-memory buffer.
*/
if (lp->b_off < sizeof(HDR) - nr)
goto corrupt;
/* Get the rest of the header from the in-memory buffer. */
memcpy((u_int8_t *)&hdr + nr, lp->buf, sizeof(HDR) - nr);
shortp = lp->buf + (sizeof(HDR) - nr);
}
/*
* Check for buffers of 0's, that's what we usually see during
* recovery, although it's certainly not something on which we
* can depend.
*/
if (hdr.len <= sizeof(HDR))
goto corrupt;
len = hdr.len - sizeof(HDR);
/* If we've already moved to the in-memory buffer, fill from there. */
if (shortp != NULL) {
if (lp->b_off < ((u_int8_t *)shortp - lp->buf) + len)
goto corrupt;
if ((ret = __db_retcopy(dbt, shortp, len,
&dblp->c_dbt.data, &dblp->c_dbt.ulen, NULL)) != 0)
goto err1;
goto cksum;
}
/* Allocate temporary memory to hold the record. */
if ((tbuf = (char *)__db_malloc(len)) == NULL) {
ret = ENOMEM;
goto err1;
}
/*
* Read the record into the buffer. If read returns a short count,
* there was an error or the rest of the record is in the in-memory
* buffer. Note, the information may be garbage if we're in recovery,
* so don't read past the end of the buffer's memory.
*/
if ((ret = __db_read(dblp->c_fd, tbuf, len, &nr)) != 0) {
fail = "read";
goto err1;
}
if (len - nr > sizeof(lp->buf))
goto corrupt;
if (nr != (ssize_t)len) {
if (lp->b_off < len - nr)
goto corrupt;
/* Get the rest of the record from the in-memory buffer. */
memcpy((u_int8_t *)tbuf + nr, lp->buf, len - nr);
}
/* Copy the record into the user's DBT. */
if ((ret = __db_retcopy(dbt, tbuf, len,
&dblp->c_dbt.data, &dblp->c_dbt.ulen, NULL)) != 0)
goto err1;
__db_free(tbuf);
tbuf = NULL;
cksum: if (hdr.cksum != __ham_func4(dbt->data, dbt->size)) {
if (!silent)
__db_err(dblp->dbenv, "log_get: checksum mismatch");
goto corrupt;
}
/* Update the cursor and the return lsn. */
dblp->c_off = hdr.prev;
dblp->c_len = hdr.len;
dblp->c_lsn = *alsn = nlsn;
return (0);
corrupt:/*
* This is the catchall -- for some reason we didn't find enough
* information or it wasn't reasonable information, and it wasn't
* because a system call failed.
*/
ret = EIO;
fail = "read";
err1: if (!silent)
if (fail == NULL)
__db_err(dblp->dbenv, "log_get: %s", strerror(ret));
else
__db_err(dblp->dbenv,
"log_get: %s: %s", fail, strerror(ret));
err2: if (np != NULL)
__db_free(np);
if (tbuf != NULL)
__db_free(tbuf);
return (ret);
}