diff options
Diffstat (limited to 'merge/mrg_open.c')
| -rw-r--r-- | merge/mrg_open.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/merge/mrg_open.c b/merge/mrg_open.c new file mode 100644 index 00000000000..708e56e1a81 --- /dev/null +++ b/merge/mrg_open.c @@ -0,0 +1,150 @@ +/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ + +/* open a MERGE-database */ + +#include "mrg_def.h" +#include <stddef.h> +#include <errno.h> +#ifdef VMS +#include "static.c" +#endif + +/* open a MERGE-database. + + if handle_locking is 0 then exit with error if some database is locked + if handle_locking is 1 then wait if database is locked +*/ + + +MRG_INFO *mrg_open( +const char *name, +int mode, +int handle_locking) +{ + int save_errno,i,errpos; + uint files,dir_length,length, options; + ulonglong file_offset; + char name_buff[FN_REFLEN*2],buff[FN_REFLEN],*end; + MRG_INFO info,*m_info; + File fd; + IO_CACHE file; + N_INFO *isam,*last_isam; + DBUG_ENTER("mrg_open"); + + LINT_INIT(last_isam); + isam=0; + errpos=files=0; + bzero((gptr) &info,sizeof(info)); + bzero((char*) &file,sizeof(file)); + if ((fd=my_open(fn_format(name_buff,name,"",MRG_NAME_EXT,4), + O_RDONLY | O_SHARE,MYF(0))) < 0 || + init_io_cache(&file, fd, IO_SIZE, READ_CACHE, 0, 0, + MYF(MY_WME | MY_NABP))) + goto err; + errpos=1; + dir_length=dirname_part(name_buff,name); + info.reclength=0; + while ((length=my_b_gets(&file,buff,FN_REFLEN-1))) + { + if ((end=buff+length)[-1] == '\n') + end[-1]='\0'; + if (buff[0] && buff[0] != '#') /* Skipp empty lines and comments */ + { + last_isam=isam; + if (!test_if_hard_path(buff)) + { + VOID(strmake(name_buff+dir_length,buff, + sizeof(name_buff)-1-dir_length)); + VOID(cleanup_dirname(buff,name_buff)); + } + if (!(isam=nisam_open(buff,mode,test(handle_locking)))) + goto err; + files++; + } + last_isam=isam; + if (info.reclength && info.reclength != isam->s->base.reclength) + { + my_errno=HA_ERR_WRONG_IN_RECORD; + goto err; + } + info.reclength=isam->s->base.reclength; + } + if (!(m_info= (MRG_INFO*) my_malloc(sizeof(MRG_INFO)+files*sizeof(MRG_TABLE), + MYF(MY_WME)))) + goto err; + *m_info=info; + m_info->open_tables=(MRG_TABLE *) (m_info+1); + m_info->tables=files; + + options= (uint) ~0; + for (i=files ; i-- > 0 ; ) + { + m_info->open_tables[i].table=isam; + m_info->options|=isam->s->base.options; + options&=isam->s->base.options; + m_info->records+=isam->s->state.records; + m_info->del+=isam->s->state.del; + m_info->data_file_length=isam->s->state.data_file_length; + if (i) + isam=(N_INFO*) (isam->open_list.next->data); + } + /* Don't force readonly if not all tables are readonly */ + if (! (options & (HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA))) + m_info->options&= ~(HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA); + + /* Fix fileinfo for easyer debugging (actually set by rrnd) */ + file_offset=0; + for (i=0 ; (uint) i < files ; i++) + { + m_info->open_tables[i].file_offset=(my_off_t) file_offset; + file_offset+=m_info->open_tables[i].table->s->state.data_file_length; + } + if (sizeof(my_off_t) == 4 && file_offset > (ulonglong) (ulong) ~0L) + { + my_errno=HA_ERR_RECORD_FILE_FULL; + my_free((char*) m_info,MYF(0)); + goto err; + } + + m_info->end_table=m_info->open_tables+files; + m_info->last_used_table=m_info->open_tables; + + VOID(my_close(fd,MYF(0))); + end_io_cache(&file); + m_info->open_list.data=(void*) m_info; + pthread_mutex_lock(&THR_LOCK_open); + mrg_open_list=list_add(mrg_open_list,&m_info->open_list); + pthread_mutex_unlock(&THR_LOCK_open); + DBUG_RETURN(m_info); + +err: + save_errno=my_errno; + switch (errpos) { + case 1: + VOID(my_close(fd,MYF(0))); + end_io_cache(&file); + for (i=files ; i-- > 0 ; ) + { + isam=last_isam; + if (i) + last_isam=(N_INFO*) (isam->open_list.next->data); + nisam_close(isam); + } + } + my_errno=save_errno; + DBUG_RETURN (NULL); +} |