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authorUlrich Drepper <drepper@redhat.com>1997-08-27 20:26:10 +0000
committerUlrich Drepper <drepper@redhat.com>1997-08-27 20:26:10 +0000
commit92f1da4da04a7a86ddee91be5eaf0b10c333ac64 (patch)
tree2a10ce9e4e407e7e5b5ca092ca0947d234b5ff60 /db2/log/log_get.c
parent22be878ecbc66606371bd33258f56e6711e6ba7a (diff)
1997-08-10 19:17 Philip Blundell <Philip.Blundell@pobox.com> * nss/nss_db/db-XXX.c: Include <db_185.h> not <db.h>. Somebody should update this to use the new db API. * nss/nss_db/db-netgrp.c: Likewise. * nss/nss_db/db-alias.c: Likewise. * db2/Makefile: Makefile for db-2.x in glibc. 1997-08-27 21:20 Ulrich Drepper <drepper@cygnus.com> * csu/Makefile (before-compile): New goal. Make sure abi-tag.h is generated. [$(elf)=yes] (asm-CPPFLAGS): Make sure abi-tag.h file can be found. * Makeconfig [$(build-omitfp)=yes] (CFLAGS-.o): Add -D__USE_STRING_INLINES. * string/string.f: Move strnlen optimization after inclusion of <bits/string.h>. Include <bits/string.h> only if __USE_STRING_INLINES is defined. * sysdeps/generic/memcpy.c: Undef memcpy to allow macro of this name in <bits/string.h>. * sysdeps/generic/memset.c: Likewise. * sysdeps/i386/string.h: i386 optimized string functions. * sysdeps/i386/i486string.h: i486+ optimized string functions. * Makefile (subdirs): Change db to db2. * shlib-versions: Bump libdb verion number to 3. * include/db.h: Include from db2 directory. * include/db_185.h: New file. * sysdeps/i386/Makefile [$(subdirs)=db2] (CPPFLAGS): Add macros to provide spinlock information for db2. * sysdeps/m68k/m68020/Makefile: New file. Likewise. * sysdeps/sparc/Makefile: New file. Likewise. * sysdeps/unix/sysv/linux/Makefile [$(subdirs)=db2] (CPPFLAGS): Add -DHAVE_LLSEEK. * db2/config.h: Hand-edited config file for db2 in glibc. * db2/compat.h: New file from db-2.3.4. * db2/db.h: Likewise. * db2/db_185.h: Likewise. * db2/db_int.h: Likewise. * db2/makedb.c: Likewise. * db2/btree/bt_close.c: Likewise. * db2/btree/bt_compare.c: Likewise. * db2/btree/bt_conv.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/btree/bt_rsearch.c: Likewise. * db2/btree/bt_search.c: Likewise. * db2/btree/bt_split.c: Likewise. * db2/btree/bt_stat.c: Likewise. * db2/btree/btree.src: Likewise. * db2/common/db_appinit.c: Likewise. * db2/common/db_err.c: Likewise. * db2/common/db_byteorder.c: Likewise. * db2/common/db_apprec.c: Likewise. * db2/common/db_salloc.c: Likewise. * db2/common/db_log2.c: Likewise. * db2/common/db_region.c: Likewise. * db2/common/db_shash.c: Likewise. * db2/db/db.c: Likewise. * db2/db/db.src: Likewise. * db2/db/db_conv.c: Likewise. * db2/db/db_dispatch.c: Likewise. * db2/db/db_dup.c: Likewise. * db2/db/db_overflow.c: Likewise. * db2/db/db_pr.c: Likewise. * db2/db/db_rec.c: Likewise. * db2/db/db_ret.c: Likewise. * db2/db/db_thread.c: Likewise. * db2/db/db_auto.c: Likewise. * db2/db185/db185.c: Likewise. * db2/db185/db185_int.h: Likewise. * db2/dbm/dbm.c: Likewise. * db2/hash/hash.c: Likewise. * db2/hash/hash.src: Likewise. * db2/hash/hash_page.c: Likewise. * db2/hash/hash_conv.c: Likewise. * db2/hash/hash_debug.c: Likewise. * db2/hash/hash_stat.c: Likewise. * db2/hash/hash_rec.c: Likewise. * db2/hash/hash_dup.c: Likewise. * db2/hash/hash_func.c: Likewise. * db2/hash/hash_auto.c: Likewise. * db2/include/mp.h: Likewise. * db2/include/btree.h: Likewise. * db2/include/db.h.src: Likewise. * db2/include/db_int.h.src: Likewise. * db2/include/db_shash.h: Likewise. * db2/include/db_swap.h: Likewise. * db2/include/db_185.h.src: Likewise. * db2/include/txn.h: Likewise. * db2/include/db_am.h: Likewise. * db2/include/shqueue.h: Likewise. * db2/include/hash.h: Likewise. * db2/include/db_dispatch.h: Likewise. * db2/include/lock.h: Likewise. * db2/include/db_page.h: Likewise. * db2/include/log.h: Likewise. * db2/include/db_auto.h: Likewise. * db2/include/btree_auto.h: Likewise. * db2/include/hash_auto.h: Likewise. * db2/include/log_auto.h: Likewise. * db2/include/txn_auto.h: Likewise. * db2/include/db_ext.h: Likewise. * db2/include/btree_ext.h: Likewise. * db2/include/clib_ext.h: Likewise. * db2/include/common_ext.h: Likewise. * db2/include/hash_ext.h: Likewise. * db2/include/lock_ext.h: Likewise. * db2/include/log_ext.h: Likewise. * db2/include/mp_ext.h: Likewise. * db2/include/mutex_ext.h: Likewise. * db2/include/os_ext.h: Likewise. * db2/include/txn_ext.h: Likewise. * db2/include/cxx_int.h: Likewise. * db2/include/db_cxx.h: Likewise. * db2/include/queue.h: Likewise. * db2/lock/lock.c: Likewise. * db2/lock/lock_conflict.c: Likewise. * db2/lock/lock_util.c: Likewise. * db2/lock/lock_deadlock.c: Likewise. * db2/log/log.c: Likewise. * db2/log/log_get.c: Likewise. * db2/log/log.src: Likewise. * db2/log/log_compare.c: Likewise. * db2/log/log_put.c: Likewise. * db2/log/log_rec.c: Likewise. * db2/log/log_archive.c: Likewise. * db2/log/log_register.c: Likewise. * db2/log/log_auto.c: Likewise. * db2/log/log_findckp.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_fset.c: Likewise. * db2/mp/mp_open.c: Likewise. * db2/mp/mp_region.c: Likewise. * db2/mp/mp_pr.c: Likewise. * db2/mp/mp_sync.c: Likewise. * db2/mutex/68020.gcc: Likewise. * db2/mutex/mutex.c: Likewise. * db2/mutex/README: Likewise. * db2/mutex/x86.gcc: Likewise. * db2/mutex/sparc.gcc: Likewise. * db2/mutex/uts4.cc.s: Likewise. * db2/mutex/alpha.dec: Likewise. * db2/mutex/alpha.gcc: Likewise. * db2/mutex/parisc.gcc: Likewise. * db2/mutex/parisc.hp: Likewise. * db2/os/db_os_abs.c: Likewise. * db2/os/db_os_dir.c: Likewise. * db2/os/db_os_fid.c: Likewise. * db2/os/db_os_lseek.c: Likewise. * db2/os/db_os_mmap.c: Likewise. * db2/os/db_os_open.c: Likewise. * db2/os/db_os_rw.c: Likewise. * db2/os/db_os_sleep.c: Likewise. * db2/os/db_os_stat.c: Likewise. * db2/os/db_os_unlink.c: Likewise. * db2/txn/txn.c: Likewise. * db2/txn/txn.src: Likewise. * db2/txn/txn_rec.c: Likewise. * db2/txn/txn_auto.c: Likewise. * db2/clib/getlong.c: Likewise. * db2/progs/db_archive/db_archive.c: Likewise. * db2/progs/db_checkpoint/db_checkpoint.c: Likewise. * db2/progs/db_deadlock/db_deadlock.c: Likewise. * db2/progs/db_dump/db_dump.c: Likewise. * db2/progs/db_dump185/db_dump185.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. * libio/stdio.h [__cplusplus] (__STDIO_INLINE): Define as inline. * po/de.po, po/sv.po: Update from 2.0.5 translations. * sysdeps/unix/sysv/linux/netinet/tcp.h: Pretty print. * sunrpc/rpc/xdr.h (XDR): Don't define argument of x_destroy callback as const. * sunrpc/xdr_mem.c (xdrmem_destroy): Don't define argument as const. * sunrpx/xdr_rec.c (xdrrec_destroy): Likewise. * sunrpx/xdr_stdio.c (xdrstdio_destroy): Likewise. 1997-08-27 18:47 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/if_index.c: Include <errno.h>. Reported by Benjamin Kosnik <bkoz@cygnus.com>. 1997-08-27 02:27 Roland McGrath <roland@baalperazim.frob.com> * abi-tags: New file. * csu/Makefile (distribute): Remove abi-tag.h. ($(objpfx)abi-tag.h): New target. * Makefile (distribute): Add abi-tags. * sysdeps/unix/sysv/linux/abi-tag.h: File removed. * sysdeps/mach/hurd/abi-tag.h: File removed. * sysdeps/stub/abi-tag.h: File removed. 1997-08-25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/unix/make-syscalls.sh: Change output so that it generates compilation rules only for the currently selected object suffixes. 1997-08-25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/dl-machine.h (RTLD_START): Switch back to previous section to avoid confusing the compiler. * sysdeps/alpha/dl-machine.h (RTLD_START): Likewise. * sysdeps/i386/dl-machine.h (RTLD_START): Likewise. * sysdeps/mips/dl-machine.h (RTLD_START): Likewise. * sysdeps/mips/mips64/dl-machine.h (RTLD_START): Likewise. * sysdeps/sparc/sparc32/dl-machine.h (RTLD_START): Likewise. * sysdeps/m68k/dl-machine.h (elf_machine_load_address): Use a GOT relocation instead of a constant to avoid text relocation. (ELF_MACHINE_BEFORE_RTLD_RELOC): Removed. (RTLD_START): Declare global labels as functions and add size directive. 1997-08-25 17:01 Ulrich Drepper <drepper@cygnus.com> * sysdeps/i386/bits/select.h: Correct assembler versions to work even for descriptors >= 32. * stdlib/alloca.h: Don't define alloca to __alloca since if gcc is used __alloca is not defined to __builtin_alloca and so might not be available. Reported by Uwe Ohse <uwe@ohse.de>. * sysdeps/unix/sysv/linux/sys/sysmacros.h: Define macros in a special way if gcc is not used and so dev_t is an array. Reported by Uwe Ohse <uwe@ohse.de>. 1997-08-23 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * manual/libc.texinfo: Reorder chapters to match logical order. 1997-08-25 12:22 Ulrich Drepper <drepper@cygnus.com> * sunrpc/rpc/xdr.h: Change name of parameters in prototypes of xdr_reference, xdrmem_create, and xdrstdio_create because of clash with g++ internal symbols. Patch by Sudish Joseph <sj@eng.mindspring.net>. * elf/dl-deps.c: Implement handling of DT_FILTER.
Diffstat (limited to 'db2/log/log_get.c')
-rw-r--r--db2/log/log_get.c355
1 files changed, 355 insertions, 0 deletions
diff --git a/db2/log/log_get.c b/db2/log/log_get.c
new file mode 100644
index 0000000000..37eb5cb249
--- /dev/null
+++ b/db2/log/log_get.c
@@ -0,0 +1,355 @@
+/*-
+ * 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 10.16 (Sleepycat) 8/19/97";
+#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 (flags != 0) {
+ 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:
+ case 0:
+ 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;
+ const char *fail;
+ char *np, *tbuf;
+ void *p, *shortp;
+
+ lp = dblp->lp;
+ fail = np = tbuf = NULL;
+
+ nlsn = dblp->c_lsn;
+ switch (flags) {
+ case DB_CHECKPOINT:
+ nlsn = dblp->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 any log file. Note, we may have only entered records
+ * in the buffer, and not yet written a log file.
+ */
+ if ((ret = __log_find(dblp->dbenv, lp, &cnt)) != 0) {
+ __db_err(dblp->dbenv,
+ "log_get: unable to find the first record: no log files found.");
+ goto err2;
+ }
+
+ /* If there's anything in the buffer, it belongs to file 1. */
+ if (cnt == 0)
+ cnt = 1;
+
+ /* Now go backwards to find the smallest one. */
+ for (; cnt > 1; --cnt)
+ if (__log_valid(dblp->dbenv, NULL, cnt) != 0) {
+ ++cnt;
+ break;
+ }
+ 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)
+ 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;
+ }
+
+ /*
+ * Move the file descriptor to the page that has the hdr. We dealt
+ * with moving to a previous log file in the flags switch code, but
+ * we don't yet know if we'll need to move to a subsequent file.
+ *
+ * Acquire a file descriptor.
+ */
+ if (dblp->c_fd == -1) {
+ if ((ret = __log_name(dblp->dbenv, nlsn.file, &np)) != 0)
+ goto err1;
+ if ((ret = __db_fdopen(np, DB_RDONLY | DB_SEQUENTIAL,
+ DB_RDONLY | DB_SEQUENTIAL, 0, &dblp->c_fd)) != 0) {
+ fail = np;
+ goto err1;
+ }
+ free(np);
+ np = NULL;
+ }
+
+ /* Seek to the header offset and read the header. */
+ if ((ret = __db_lseek(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 *)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;
+ free(tbuf);
+
+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)
+ free(np);
+ if (tbuf != NULL)
+ free(tbuf);
+ return (ret);
+}