Commit 0f465645 authored by unknown's avatar unknown

Merge jcole@work.mysql.com:/home/bk/mysql-4.0

into mugatu.spaceapes.com:/home/jcole/bk/mysql-4.0

parents fcdf3ac0 0c382a71
...@@ -48,24 +48,26 @@ include.texi: ../configure.in ...@@ -48,24 +48,26 @@ include.texi: ../configure.in
grep "MYSQL_TCP_PORT_DEFAULT=" ../configure.in | \ grep "MYSQL_TCP_PORT_DEFAULT=" ../configure.in | \
sed -e 's;MYSQL_TCP_PORT_DEFAULT=;;' >> $@ sed -e 's;MYSQL_TCP_PORT_DEFAULT=;;' >> $@
#
# English Manual
#
# GNU Info
mysql.info: manual.texi include.texi mysql.info: manual.texi include.texi
cd $(srcdir) && $(MAKEINFO) --no-split -I $(srcdir) $< cd $(srcdir) && $(MAKEINFO) --no-split -I $(srcdir) $<
# Plain Text
manual.txt: manual.texi include.texi manual.txt: manual.texi include.texi
cd $(srcdir) && \ cd $(srcdir) && \
$(MAKEINFO) -I $(srcdir) --no-headers --no-split --output $@ $< $(MAKEINFO) -I $(srcdir) --no-headers --no-split --output $@ $<
# HTML, all in one file
manual.html: manual.texi include.texi $(srcdir)/Support/texi2html manual.html: manual.texi include.texi $(srcdir)/Support/texi2html
cd $(srcdir) && @PERL@ $(srcdir)/Support/texi2html $(TEXI2HTML_FLAGS) $< cd $(srcdir) && @PERL@ $(srcdir)/Support/texi2html $(TEXI2HTML_FLAGS) $<
manual_toc.html: manual.html manual_toc.html: manual.html
# PDF, Portable Document Format
# Fix: add --output-comment with some interesting info?
# Fix: @image worked with a older version of pdftex.
# Note: @image will work if we first convert all images to pdf ...
# is that worth it?
# Comment: We need to run pdftex 2 times to get the cross references right.
manual.pdf: manual.texi manual.pdf: manual.texi
cat manual.texi | sed -e 's|@image{[^}]*} *||g' > manual-tmp.texi cat manual.texi | sed -e 's|@image{[^}]*} *||g' > manual-tmp.texi
pdftex --interaction=nonstopmode manual-tmp.texi pdftex --interaction=nonstopmode manual-tmp.texi
...@@ -77,33 +79,14 @@ manual.pdf: manual.texi ...@@ -77,33 +79,14 @@ manual.pdf: manual.texi
rm -f manual-tmp.* rm -f manual-tmp.*
touch $@ touch $@
# Target to produce NuSphere Manual # XML, DocBook 4.0
nusphere.pdf: manual.texi
cat manual.texi \
| sed -e 's/@example/@smallexample/g' \
-e 's/@end example/@end smallexample/g' \
-e 's/@c ifnusphere //g' \
-e 's|@image{[^}]*} *||g' \
> manual-tmp.texi
pdftex --interaction=nonstopmode manual-tmp.texi
texindex manual-tmp.??
pdftex --interaction=nonstopmode manual-tmp.texi
texindex manual-tmp.??
pdftex --interaction=nonstopmode manual-tmp.texi
mv manual-tmp.pdf nusphere.pdf
rm -f manual-tmp.*
touch $@
# Target to produce DocBook XML
mysql.xml: manual.texi include.texi mysql.xml: manual.texi include.texi
$(MAKEINFO) --force --no-ifinfo --docbook manual.texi $(MAKEINFO) --force --no-ifinfo --docbook manual.texi
mv mysql.xml mysql-tmp.xml mv mysql.xml mysql-tmp.xml
Support/docbook-fixup.pl <mysql-tmp.xml >mysql.xml Support/docbook-fixup.pl <mysql-tmp.xml >mysql.xml
rm -f mysql-tmp.xml rm -f mysql-tmp.xml
# The texi2dvi gives a lot of harmless errors. Just ignore them unless # Postscript, A4 Paper
# you want to help with the typesetting part.
# This is the European papersize version
manual_a4.ps: manual.texi include.texi manual_a4.ps: manual.texi include.texi
TEXINPUTS=$(srcdir):$$TEXINPUTS \ TEXINPUTS=$(srcdir):$$TEXINPUTS \
MAKEINFO='$(MAKEINFO) -I $(srcdir)' \ MAKEINFO='$(MAKEINFO) -I $(srcdir)' \
...@@ -111,7 +94,7 @@ manual_a4.ps: manual.texi include.texi ...@@ -111,7 +94,7 @@ manual_a4.ps: manual.texi include.texi
$(DVIPS) -t a4 manual.dvi -o $@ $(DVIPS) -t a4 manual.dvi -o $@
touch $@ touch $@
# This is the American papersize version # Postscript, US Letter Paper
manual_letter.ps: manual.texi include.texi manual_letter.ps: manual.texi include.texi
TEXINPUTS=$(srcdir):$$TEXINPUTS \ TEXINPUTS=$(srcdir):$$TEXINPUTS \
MAKEINFO='$(MAKEINFO) -I $(srcdir)' \ MAKEINFO='$(MAKEINFO) -I $(srcdir)' \
...@@ -119,6 +102,82 @@ manual_letter.ps: manual.texi include.texi ...@@ -119,6 +102,82 @@ manual_letter.ps: manual.texi include.texi
$(DVIPS) -t letter manual.dvi -o $@ $(DVIPS) -t letter manual.dvi -o $@
touch $@ touch $@
#
# German Manual
#
# GNU Info
mysql.de.info: manual.de.texi include.texi
cd $(srcdir) && $(MAKEINFO) --no-split -I $(srcdir) $<
# Plain Text
manual.de.txt: manual.de.texi include.texi
cd $(srcdir) && \
$(MAKEINFO) -I $(srcdir) --no-headers --no-split --output $@ $<
# HTML, all in one file
manual.de.html: manual.de.texi include.texi $(srcdir)/Support/texi2html
cd $(srcdir) && @PERL@ $(srcdir)/Support/texi2html $(TEXI2HTML_FLAGS) $<
manual_toc.de.html: manual.html
# PDF, Portable Document Format
manual.de.pdf: manual.de.texi
cat manual.de.texi | sed -e 's|@image{[^}]*} *||g' > manual-tmp.texi
pdftex --interaction=nonstopmode manual-tmp.texi
texindex manual-tmp.??
pdftex --interaction=nonstopmode manual-tmp.texi
texindex manual-tmp.??
pdftex --interaction=nonstopmode manual-tmp.texi
mv manual-tmp.pdf manual.de.pdf
rm -f manual-tmp.*
touch $@
# XML, DocBook 4.0
mysql.de.xml: manual.de.texi include.texi
$(MAKEINFO) --force --no-ifinfo --docbook manual.de.texi
mv mysql.de.xml mysql-tmp.xml
Support/docbook-fixup.pl <mysql-tmp.xml >mysql.de.xml
rm -f mysql-tmp.xml
# Postscript, A4 Paper
manual_a4.de.ps: manual.de.texi include.texi
TEXINPUTS=$(srcdir):$$TEXINPUTS \
MAKEINFO='$(MAKEINFO) -I $(srcdir)' \
$(TEXI2DVI) --batch --texinfo --quiet '@afourpaper' $<
$(DVIPS) -t a4 manual.de.dvi -o $@
touch $@
# Postscript, US Letter Paper
manual_letter.de.ps: manual.de.texi include.texi
TEXINPUTS=$(srcdir):$$TEXINPUTS \
MAKEINFO='$(MAKEINFO) -I $(srcdir)' \
$(TEXI2DVI) --batch $<
$(DVIPS) -t letter manual.de.dvi -o $@
touch $@
#
# Miscellaneous
#
# Target to produce NuSphere Manual
nusphere.pdf: manual.texi
cat manual.texi \
| sed -e 's/@example/@smallexample/g' \
-e 's/@end example/@end smallexample/g' \
-e 's/@c ifnusphere //g' \
-e 's|@image{[^}]*} *||g' \
> manual-tmp.texi
pdftex --interaction=nonstopmode manual-tmp.texi
texindex manual-tmp.??
pdftex --interaction=nonstopmode manual-tmp.texi
texindex manual-tmp.??
pdftex --interaction=nonstopmode manual-tmp.texi
mv manual-tmp.pdf nusphere.pdf
rm -f manual-tmp.*
touch $@
# Include images for the manual in the distribution # Include images for the manual in the distribution
dist-hook: dist-hook:
BD=`cd $(top_srcdir); pwd`; \ BD=`cd $(top_srcdir); pwd`; \
......
\input texinfo @c -*-texinfo-*- \input texinfo @c -*-texinfo-*-
@c Copyright 1998 TcX AB, Detron HB and Monty Program KB @c Copyright 2002 MySQL AB, TcX AB, Detron HB and Monty Program KB
@c @c
@c %**start of header @c %**start of header
@setfilename internals.info @setfilename internals.info
@c We want the types in the same index @c We want the types in the same index
@c @synindex tp fn cp
@synindex cp fn @synindex cp fn
@iftex @iftex
@c Well this is normal in Europe. Maybe this should go into the include.texi?
@afourpaper @afourpaper
@end iftex @end iftex
@c Get version and other info @c Get version and other info
@include include.texi @include include.texi
@ifclear tex-debug @ifclear tex-debug
@c This removes the black squares in the right margin @c This removes the black squares in the right margin
@finalout @finalout
@end ifclear @end ifclear
@c Set background for HTML @c Set background for HTML
@set _body_tags BGCOLOR=#FFFFFF TEXT=#000000 LINK=#101090 VLINK=#7030B0 @set _body_tags BGCOLOR=#FFFFFF TEXT=#000000 LINK=#101090 VLINK=#7030B0
@settitle @strong{MySQL} internals Manual for version @value{mysql_version}. @settitle @strong{MySQL} Internals Manual for version @value{mysql_version}.
@setchapternewpage off @setchapternewpage odd
@paragraphindent 0 @paragraphindent 0
@c %**end of header @c %**end of header
@ifinfo @ifinfo
...@@ -35,67 +39,77 @@ END-INFO-DIR-ENTRY ...@@ -35,67 +39,77 @@ END-INFO-DIR-ENTRY
@sp 10 @sp 10
@center @titlefont{@strong{MySQL} Internals Manual} @center @titlefont{@strong{MySQL} Internals Manual}
@sp 10 @sp 10
@center Copyright @copyright{} 1998 TcX AB, Detron HB and Monty Program KB @center Copyright @copyright{} 1998-2002 MySQL AB
@page
@end titlepage @end titlepage
@node Top, Introduction, (dir), (dir) @node Top, caching, (dir), (dir)
@ifinfo @ifinfo
This is a manual about @strong{MySQL} internals. This is a manual about @strong{MySQL} internals.
@end ifinfo @end ifinfo
@menu @menu
* caching:: How MySQL Handles Caching
* flush tables:: How MySQL Handles @code{FLUSH TABLES}
* filesort:: How MySQL Does Sorting (@code{filesort})
* coding guidelines:: Coding Guidelines
* mysys functions:: Functions In The @code{mysys} Library
* DBUG:: DBUG Tags To Use
* protocol:: MySQL Client/Server Protocol
@end menu @end menu
@node caching,,,
@chapter How MySQL handles caching @node caching, flush tables, Top, Top
@chapter How MySQL Handles Caching
@strong{MySQL} has the following caches: @strong{MySQL} has the following caches:
(Note that the some of the filename have a wrong spelling of cache. :) (Note that the some of the filename have a wrong spelling of cache. :)
@itemize @bullet @table @strong
@item Key cache @item Key Cache
A shared cache for all B-tree index blocks in the different NISAM A shared cache for all B-tree index blocks in the different NISAM
files. Uses hashing and reverse linked lists for quick caching of the files. Uses hashing and reverse linked lists for quick caching of the
last used blocks and quick flushing of changed entries for a specific last used blocks and quick flushing of changed entries for a specific
table. (@file{mysys/mf_keycash.c}) table. (@file{mysys/mf_keycash.c})
@item Record cache @item Record Cache
This is used for quick scanning of all records in a table. This is used for quick scanning of all records in a table.
(@file{mysys/mf_iocash.c} and @file{isam/_cash.c}) (@file{mysys/mf_iocash.c} and @file{isam/_cash.c})
@item Table cache @item Table Cache
This holds the last used tables. (@file{sql/sql_base.cc}) This holds the last used tables. (@file{sql/sql_base.cc})
@item Hostname cache @item Hostname Cache
For quick lookup (with reverse name resolving). Is a must when one has a For quick lookup (with reverse name resolving). Is a must when one has a
slow DNS. slow DNS.
(@file{sql/hostname.cc}) (@file{sql/hostname.cc})
@item Privilege cache @item Privilege Cache
To allow quick change between databases the last used privileges are To allow quick change between databases the last used privileges are
cached for each user/database combination. cached for each user/database combination.
(@file{sql/sql_acl.cc}) (@file{sql/sql_acl.cc})
@item Heap table cache @item Heap Table Cache
Many use of GROUP BY or DISTINCT caches all found Many use of @code{GROUP BY} or @code{DISTINCT} caches all found rows in
rows in a HEAP table (this is a very quick in-memory table with hash index) a @code{HEAP} table. (This is a very quick in-memory table with hash index.)
@item Join row cache. @item Join Row Cache
For every full join in a SELECT statement (a full join here means there For every full join in a @code{SELECT} statement (a full join here means
were no keys that one could use to find the next table in a list), the there were no keys that one could use to find the next table in a list),
found rows are cached in a join cache. One SELECT query can use many the found rows are cached in a join cache. One @code{SELECT} query can
join caches in the worst case. use many join caches in the worst case.
@end itemize @end table
@node flush tables,,,
@chapter How MySQL handles flush tables @node flush tables, filesort, caching, Top
@chapter How MySQL Handles @code{FLUSH TABLES}
@itemize @bullet @itemize @bullet
@item @item
Flush tables is handled in @code{sql/sql_base.cc::close_cached_tables()}. Flush tables is handled in @file{sql/sql_base.cc::close_cached_tables()}.
@item @item
The idea of flush tables is to force all tables to be closed. This The idea of flush tables is to force all tables to be closed. This
...@@ -109,8 +123,8 @@ all tables)! ...@@ -109,8 +123,8 @@ all tables)!
When one does a @code{FLUSH TABLES}, the variable @code{refresh_version} When one does a @code{FLUSH TABLES}, the variable @code{refresh_version}
will be incremented. Every time a thread releases a table it checks if will be incremented. Every time a thread releases a table it checks if
the refresh version of the table (updated at open) is the same as the refresh version of the table (updated at open) is the same as
the current refresh_version. If not it will close it and broadcast the current @code{refresh_version}. If not it will close it and broadcast
a signal on COND_refresh (to wait any thread that is waiting for a signal on @code{COND_refresh} (to wait any thread that is waiting for
all instanses of a table to be closed). all instanses of a table to be closed).
@item @item
...@@ -119,8 +133,8 @@ The current @code{refresh_version} is also compared to the open ...@@ -119,8 +133,8 @@ The current @code{refresh_version} is also compared to the open
refresh version is different the thread will free all locks, reopen the refresh version is different the thread will free all locks, reopen the
table and try to get the locks again; This is just to quickly get all table and try to get the locks again; This is just to quickly get all
tables to use the newest version. This is handled by tables to use the newest version. This is handled by
@code{sql/lock.cc::mysql_lock_tables()} and @file{sql/lock.cc::mysql_lock_tables()} and
@code{sql/sql_base.cc::wait_for_tables()}. @file{sql/sql_base.cc::wait_for_tables()}.
@item @item
When all tables has been closed @code{FLUSH TABLES} will return an ok When all tables has been closed @code{FLUSH TABLES} will return an ok
...@@ -134,8 +148,8 @@ After this it will give other threads a chance to open the same tables. ...@@ -134,8 +148,8 @@ After this it will give other threads a chance to open the same tables.
@end itemize @end itemize
@node Filesort,,, @node filesort, coding guidelines, flush tables, Top
@chapter How MySQL does sorting (filesort) @chapter How MySQL Does Sorting (@code{filesort})
@itemize @bullet @itemize @bullet
...@@ -146,7 +160,7 @@ Read all rows according to key or by table scanning. ...@@ -146,7 +160,7 @@ Read all rows according to key or by table scanning.
Store the sort-key in a buffer (@code{sort_buffer}). Store the sort-key in a buffer (@code{sort_buffer}).
@item @item
When the buffer gets full, run a qsort on it and store the result When the buffer gets full, run a @code{qsort} on it and store the result
in a temporary file. Save a pointer to the sorted block. in a temporary file. Save a pointer to the sorted block.
@item @item
...@@ -174,8 +188,9 @@ and then we read the rows in the sorted order into a row buffer ...@@ -174,8 +188,9 @@ and then we read the rows in the sorted order into a row buffer
@end itemize @end itemize
@node Coding guidelines,,,
@chapter Coding guidelines @node coding guidelines, mysys functions, filesort, Top
@chapter Coding Guidelines
@itemize @bullet @itemize @bullet
...@@ -225,23 +240,23 @@ Don't use two commands on the same line. ...@@ -225,23 +240,23 @@ Don't use two commands on the same line.
Do not check the same pointer for @code{NULL} more than once. Do not check the same pointer for @code{NULL} more than once.
@item @item
Use long function and variable names in English; This makes your code Use long function and variable names in English. This makes your code
easier to read. easier to read.
@item @item
Use my_var as opposed to myVar or MyVar (@samp{_} rather than dancing SHIFT Use @code{my_var} as opposed to @code{myVar} or @code{MyVar} (@samp{_}
to seperate words in identifiers). rather than dancing SHIFT to seperate words in identifiers).
@item @item
Think assembly - make it easier for the compiler to optimize your code. Think assembly - make it easier for the compiler to optimize your code.
@item @item
Comment your code when you do something that someone else may think Comment your code when you do something that someone else may think
is not ''trivial''. is not ``trivial''.
@item @item
Use @code{libstring} functions (in the strings directory) Use @code{libstring} functions (in the @file{strings} directory)
instead of standard libc string functions whenever possible. instead of standard @code{libc} string functions whenever possible.
@item @item
Avoid using @code{malloc()} (its REAL slow); For memory allocations Avoid using @code{malloc()} (its REAL slow); For memory allocations
...@@ -268,26 +283,25 @@ Any @code{#define}'s are in all-caps. ...@@ -268,26 +283,25 @@ Any @code{#define}'s are in all-caps.
Matching @samp{@{} are in the same column. Matching @samp{@{} are in the same column.
@item @item
Put the @samp{@{} after a 'switch' on the same line Put the @samp{@{} after a @code{switch} on the same line, as this gives
better overall indentation for the switch statement:
@example @example
switch (arg) { switch (arg) {
@end example @end example
Because this gives better overall indentation for the switch statement.
@item @item
In all other cases, @{ and @} should be on their own line, except In all other cases, @samp{@{} and @samp{@}} should be on their own line, except
if there is nothing inside @{ @}. if there is nothing inside @samp{@{} and @samp{@}}.
@item @item
Have a space after 'if' Have a space after @code{if}
@item @item
Put a space after ',' for function arguments Put a space after @samp{,} for function arguments
@item @item
Functions return 0 on success, and non-zero on error, so you can do: Functions return @samp{0} on success, and non-zero on error, so you can do:
@example @example
if(a() || b() || c()) { error("something went wrong"); } if(a() || b() || c()) { error("something went wrong"); }
...@@ -335,113 +349,110 @@ Suggested mode in emacs: ...@@ -335,113 +349,110 @@ Suggested mode in emacs:
(setq c-default-style "MY") (setq c-default-style "MY")
@end example @end example
@node mysys functions,,,
@chapter mysys functions @node mysys functions, DBUG, coding guidelines, Top
@chapter Functions In The @code{mysys} Library
Functions i mysys: (For flags se my_sys.h)
Functions in @code{mysys}: (For flags see @file{my_sys.h})
int my_copy _A((const char *from,const char *to,myf MyFlags));
- Copy file @table @code
@item int my_copy _A((const char *from, const char *to, myf MyFlags));
int my_delete _A((const char *name,myf MyFlags)); Copy file from @code{from} to @code{to}.
- Delete file
@item int my_delete _A((const char *name, myf MyFlags));
int my_getwd _A((string buf,uint size,myf MyFlags)); Delete file @code{name}.
int my_setwd _A((const char *dir,myf MyFlags));
- Get and set working directory @item int my_getwd _A((string buf, uint size, myf MyFlags));
@item int my_setwd _A((const char *dir, myf MyFlags));
string my_tempnam _A((const char *pfx,myf MyFlags)); Get and set working directory.
- Make a uniq temp file name by using dir and adding something after
pfx to make name uniq. Name is made by adding a uniq 6 length-string @item string my_tempnam _A((const char *pfx, myf MyFlags));
and TMP_EXT after pfx. Make a unique temporary file name by using dir and adding something after
Returns pointer to malloced area for filename. Should be freed by @code{pfx} to make name unique. The file name is made by adding a unique
free(). six character string and @code{TMP_EXT} after @code{pfx}.
Returns pointer to @code{malloc()}'ed area for filename. Should be freed by
File my_open _A((const char *FileName,int Flags,myf MyFlags)); @code{free()}.
File my_create _A((const char *FileName,int CreateFlags,
int AccsesFlags, myf MyFlags)); @item File my_open _A((const char *FileName,int Flags,myf MyFlags));
int my_close _A((File Filedes,myf MyFlags)); @item File my_create _A((const char *FileName, int CreateFlags, int AccsesFlags, myf MyFlags));
uint my_read _A((File Filedes,byte *Buffer,uint Count,myf MyFlags)); @item int my_close _A((File Filedes, myf MyFlags));
uint my_write _A((File Filedes,const byte *Buffer,uint Count, @item uint my_read _A((File Filedes, byte *Buffer, uint Count, myf MyFlags));
myf MyFlags)); @item uint my_write _A((File Filedes, const byte *Buffer, uint Count, myf MyFlags));
ulong my_seek _A((File fd,ulong pos,int whence,myf MyFlags)); @item ulong my_seek _A((File fd,ulong pos,int whence,myf MyFlags));
ulong my_tell _A((File fd,myf MyFlags)); @item ulong my_tell _A((File fd,myf MyFlags));
- Use instead of open,open-with-create-flag, close read and write Use instead of open, open-with-create-flag, close, read, and write
to get automatic error-messages (flag: MYF_WME) and only have to get automatic error messages (flag @code{MYF_WME}) and only have
to test for != 0 if error (flag: MY_NABP). to test for != 0 if error (flag @code{MY_NABP}).
int my_rename _A((const char *from,const char *to,myf MyFlags)); @item int my_rename _A((const char *from, const char *to, myf MyFlags));
- Rename file Rename file from @code{from} to @code{to}.
FILE *my_fopen _A((const char *FileName,int Flags,myf MyFlags)); @item FILE *my_fopen _A((const char *FileName,int Flags,myf MyFlags));
FILE *my_fdopen _A((File Filedes,int Flags,myf MyFlags)); @item FILE *my_fdopen _A((File Filedes,int Flags,myf MyFlags));
int my_fclose _A((FILE *fd,myf MyFlags)); @item int my_fclose _A((FILE *fd,myf MyFlags));
uint my_fread _A((FILE *stream,byte *Buffer,uint Count,myf MyFlags)); @item uint my_fread _A((FILE *stream,byte *Buffer,uint Count,myf MyFlags));
uint my_fwrite _A((FILE *stream,const byte *Buffer,uint Count, @item uint my_fwrite _A((FILE *stream,const byte *Buffer,uint Count, myf MyFlags));
myf MyFlags)); @item ulong my_fseek _A((FILE *stream,ulong pos,int whence,myf MyFlags));
ulong my_fseek _A((FILE *stream,ulong pos,int whence,myf MyFlags)); @item ulong my_ftell _A((FILE *stream,myf MyFlags));
ulong my_ftell _A((FILE *stream,myf MyFlags)); Same read-interface for streams as for files.
- Same read-interface for streams as for files
@item gptr _mymalloc _A((uint uSize,const char *sFile,uint uLine, myf MyFlag));
gptr _mymalloc _A((uint uSize,const char *sFile, @item gptr _myrealloc _A((string pPtr,uint uSize,const char *sFile,uint uLine, myf MyFlag));
uint uLine, myf MyFlag)); @item void _myfree _A((gptr pPtr,const char *sFile,uint uLine));
gptr _myrealloc _A((string pPtr,uint uSize,const char *sFile, @item int _sanity _A((const char *sFile,unsigned int uLine));
uint uLine, myf MyFlag)); @item gptr _myget_copy_of_memory _A((const byte *from,uint length,const char *sFile, uint uLine,myf MyFlag));
void _myfree _A((gptr pPtr,const char *sFile,uint uLine)); @code{malloc(size,myflag)} is mapped to these functions if not compiled
int _sanity _A((const char *sFile,unsigned int uLine)); with @code{-DSAFEMALLOC}.
gptr _myget_copy_of_memory _A((const byte *from,uint length,
const char *sFile, uint uLine, @item void TERMINATE _A((void));
myf MyFlag)); Writes @code{malloc()} info on @code{stdout} if compiled with
- malloc(size,myflag) is mapped to this functions if not compiled @code{-DSAFEMALLOC}.
with -DSAFEMALLOC
@item int my_chsize _A((File fd, ulong newlength, myf MyFlags));
void TERMINATE _A((void)); Change size of file @code{fd} to @code{newlength}.
- Writes malloc-info on stdout if compiled with -DSAFEMALLOC.
@item void my_error _D((int nr, myf MyFlags, ...));
int my_chsize _A((File fd,ulong newlength,myf MyFlags)); Writes message using error number (see @file{mysys/errors.h}) on @code{stdout},
- Change size of file or using curses, if @code{MYSYS_PROGRAM_USES_CURSES()} has been called.
void my_error _D((int nr,myf MyFlags, ...)); @item void my_message _A((const char *str, myf MyFlags));
- Writes message using error number (se mysys/errors.h) on Writes @code{str} on @code{stdout}, or using curses, if
stdout or curses if MYSYS_PROGRAM_USES_CURSES() is called. @code{MYSYS_PROGRAM_USES_CURSES()} has been called.
void my_message _A((const char *str,myf MyFlags)); @item void my_init _A((void ));
- Writes message-string on Start each program (in @code{main()}) with this.
stdout or curses if MYSYS_PROGRAM_USES_CURSES() is called.
@item void my_end _A((int infoflag));
void my_init _A((void )); Gives info about program.
- Start each program (in main) with this. If @code{infoflag & MY_CHECK_ERROR}, prints if some files are left open.
void my_end _A((int infoflag)); If @code{infoflag & MY_GIVE_INFO}, prints timing info and malloc info
- Gives info about program. about program.
- If infoflag & MY_CHECK_ERROR prints if some files are left open
- If infoflag & MY_GIVE_INFO prints timing info and malloc info @item int my_redel _A((const char *from, const char *to, int MyFlags));
about prog. Delete @code{from} before rename of @code{to} to @code{from}. Copies state
from old file to new file. If @code{MY_COPY_TIME} is set, sets old time.
int my_redel _A((const char *from, const char *to, int MyFlags));
- Delete from before rename of to to from. Copyes state from old @item int my_copystat _A((const char *from, const char *to, int MyFlags));
file to new file. If MY_COPY_TIME is set sets old time. Copy state from old file to new file. If @code{MY_COPY_TIME} is set,
sets old time.
int my_copystat _A((const char *from, const char *to, int MyFlags));
- Copye state from old file to new file. @item string my_filename _A((File fd));
If MY_COPY_TIME is set sets copy also time. Returns filename of open file.
string my_filename _A((File fd)); @item int dirname _A((string to, const char *name));
- Give filename of open file. Copy name of directory from filename.
int dirname _A((string to,const char *name)); @item int test_if_hard_path _A((const char *dir_name));
- Copy name of directory from filename. Test if @code{dir_name} is a hard path (starts from root).
int test_if_hard_path _A((const char *dir_name)); @item void convert_dirname _A((string name));
- Test if dirname is a hard path (Starts from root) Convert dirname according to system.
In MSDOS, changes all characters to capitals and changes @samp{/} to @samp{\}.
void convert_dirname _A((string name));
- Convert dirname acording to system. @item string fn_ext _A((const char *name));
- In MSDOS changes all caracters to capitals and changes '/' to Returns pointer to extension in filename.
'\'
string fn_ext _A((const char *name)); @item string fn_format _A((string to,const char *name,const char *dsk,const char *form,int flag));
- Returns pointer to extension in filename
string fn_format _A((string to,const char *name,const char *dsk,
const char *form,int flag));
format a filename with replace of library and extension and format a filename with replace of library and extension and
converts between different systems. converts between different systems.
params to and name may be identicall params to and name may be identicall
...@@ -455,60 +466,93 @@ Functions i mysys: (For flags se my_sys.h) ...@@ -455,60 +466,93 @@ Functions i mysys: (For flags se my_sys.h)
"open(fn_format(temp_buffe,name,"","",4),...)" to unpack home and "open(fn_format(temp_buffe,name,"","",4),...)" to unpack home and
convert filename to system-form. convert filename to system-form.
string fn_same _A((string toname,const char *name,int flag)); @item string fn_same _A((string toname, const char *name, int flag));
- Copys directory and extension from name to toname if neaded. Copys directory and extension from @code{name} to @code{toname} if neaded.
copy can be forced by same flags that in fn_format. Copying can be forced by same flags used in @code{fn_format()}.
@item int wild_compare _A((const char *str, const char *wildstr));
Compare if @code{str} matches @code{wildstr}. @code{wildstr} can contain
@samp{*} and @samp{?} as wildcard characters.
Returns 0 if @code{str} and @code{wildstr} match.
int wild_compare _A((const char *str,const char *wildstr)); @item void get_date _A((string to, int timeflag));
- Compare if str matches wildstr. Wildstr can contain "*" and "?" Get current date in a form ready for printing.
as match-characters.
Returns 0 if match.
void get_date _A((string to,int timeflag)); @item void soundex _A((string out_pntr, string in_pntr))
- Get current date in a form ready for printing. Makes @code{in_pntr} to a 5 char long string. All words that sound
alike have the same string.
void soundex _A((string out_pntr, string in_pntr)) @item int init_key_cache _A((ulong use_mem, ulong leave_this_much_mem));
- Makes in_pntr to a 5 chars long string. All words that sounds Use caching of keys in MISAM, PISAM, and ISAM.
alike have the same string. @code{KEY_CACHE_SIZE} is a good size.
Remember to lock databases for optimal caching.
int init_key_cache _A((ulong use_mem,ulong leave_this_much_mem)); @item void end_key_cache _A((void));
- Use cacheing of keys in MISAM, PISAM, and ISAM. End key caching.
KEY_CACHE_SIZE is a good size.
- Remember to lock databases for optimal cacheing
void end_key_cache _A((void));
- End key-cacheing.
@node DBUG,,, @node DBUG, protocol, mysys functions, Top
@chapter The DBUG tags to use: @chapter DBUG Tags To Use
Here is some of the tags we now use: Here is some of the tags we now use:
(We should probably add a couple of new ones) (We should probably add a couple of new ones)
"enter" Arguments to the function. @table @code
"exit" Results from the function. @item enter
"info" is something that may be interesting. Arguments to the function.
"warning" is when something doesn't go the usual route or may be wrong.
"error" when something went wrong. @item exit
"loop" write in a loop, that is probably only useful when debugging Results from the function.
the loop. These should normally be deleted when on is
satisfied with the code and it has been in real use for a while. @item info
Something that may be interesting.
@item warning
When something doesn't go the usual route or may be wrong.
@item error
When something went wrong.
@item loop
Write in a loop, that is probably only useful when debugging
the loop. These should normally be deleted when one is
satisfied with the code and it has been in real use for a while.
@end table
Some specific to mysqld, because we want to watch these carefully: Some specific to mysqld, because we want to watch these carefully:
"trans" Starting/stopping transactions. @table @code
"quit" 'info' when mysqld is preparing to die. @item trans
"query" Print query Starting/stopping transactions.
@item quit
@code{info} when mysqld is preparing to die.
@item query
Print query.
@end table
@node protocol,,,
@chapter MySQL client/server protocol
Raw packet without compression @node protocol, , DBUG, Top
============================== @chapter MySQL Client/Server Protocol
@menu
* raw packet without compression::
* raw packet with compression::
* basic packets::
* communication::
* fieldtype codes::
@end menu
@node raw packet without compression, raw packet with compression, protocol, protocol
@section Raw Packet Without Compression
@example
------------------------------------------------- -------------------------------------------------
| Packet Length | Packet no | Data | | Packet Length | Packet no | Data |
| 3 Bytes | 1 Byte | n Bytes | | 3 Bytes | 1 Byte | n Bytes |
------------------------------------------------- -------------------------------------------------
@end example
3 Byte packet length 3 Byte packet length
The length is calculated with int3store The length is calculated with int3store
...@@ -526,12 +570,15 @@ n Byte data ...@@ -526,12 +570,15 @@ n Byte data
The packet length can be recalculated with: The packet length can be recalculated with:
length = byte1 + (256 * byte2) + (256 * 256 * byte3) length = byte1 + (256 * byte2) + (256 * 256 * byte3)
Raw packet with compression @node raw packet with compression, basic packets, raw packet without compression, protocol
=========================== @section Raw Packet With Compression
@example
----------------------------------------------------- -----------------------------------------------------
| Packet Length | Packet no | Uncomp. Packet Length | | Packet Length | Packet no | Uncomp. Packet Length |
| 3 Bytes | 1 Byte | 3 Bytes | | 3 Bytes | 1 Byte | 3 Bytes |
----------------------------------------------------- -----------------------------------------------------
@end example
3 Byte packet length 3 Byte packet length
The length is calculated with int3store The length is calculated with int3store
...@@ -540,14 +587,23 @@ Raw packet with compression ...@@ -540,14 +587,23 @@ Raw packet with compression
1 Byte packet no 1 Byte packet no
3 Byte uncompressed packet length 3 Byte uncompressed packet length
If compression is used the first 7 bytes of each paket If compression is used the first 7 bytes of each packet
is the header of the paket. is the header of the packet.
@node basic packets, communication, raw packet with compression, protocol
@section Basic Packets
@menu
* ok packet::
* error packet::
@end menu
@node ok packet, error packet, basic packets, basic packets
@subsection OK Packet
Basic packets
==============
OK-packet
For details see sql/net_pkg.cc For details see sql/net_pkg.cc
function send_ok function send_ok
@example
------------------------------------------------- -------------------------------------------------
| Header | No of Rows | Affected Rows | | Header | No of Rows | Affected Rows |
| | 1 Byte | 1-8 Byte | | | 1 Byte | 1-8 Byte |
...@@ -558,6 +614,7 @@ OK-packet ...@@ -558,6 +614,7 @@ OK-packet
| Messagetext | | Messagetext |
| n Byte | | n Byte |
------------------------------------------------- -------------------------------------------------
@end example
Header Header
1 byte number of rows ? (always 0 ?) 1 byte number of rows ? (always 0 ?)
...@@ -568,7 +625,11 @@ OK-packet ...@@ -568,7 +625,11 @@ OK-packet
1-8 bytes length of message 1-8 bytes length of message
n bytes messagetext n bytes messagetext
Error-packet
@node error packet, , ok packet, basic packets
@subsection Error Packet
@example
------------------------------------------------- -------------------------------------------------
| Header | Statuscode | Error no | | Header | Statuscode | Error no |
| | 1 Byte | 2 Byte | | | 1 Byte | 2 Byte |
...@@ -576,6 +637,7 @@ Error-packet ...@@ -576,6 +637,7 @@ Error-packet
| Messagetext | 0x00 | | Messagetext | 0x00 |
| n Byte | 1 Byte | | n Byte | 1 Byte |
------------------------------------------------- -------------------------------------------------
@end example
Header Header
1 byte status code (0xFF = ERROR) 1 byte status code (0xFF = ERROR)
...@@ -584,9 +646,8 @@ Error-packet ...@@ -584,9 +646,8 @@ Error-packet
1 byte 0x00 1 byte 0x00
@node communication, fieldtype codes, basic packets, protocol
The communication @section Communication
=================
> Packet from server to client > Packet from server to client
< Paket from client tor server < Paket from client tor server
...@@ -677,9 +738,10 @@ The communication ...@@ -677,9 +738,10 @@ The communication
n data n data
Fieldtype Codes: @node fieldtype codes, , communication, protocol
================ @section Fieldtype Codes
@example
display_length |enum_field_type |flags display_length |enum_field_type |flags
---------------------------------------------------- ----------------------------------------------------
Blob 03 FF FF 00 |01 FC |03 90 00 00 Blob 03 FF FF 00 |01 FC |03 90 00 00
...@@ -698,7 +760,7 @@ Datetime 03 13 00 00 |01 0C |03 00 00 00 ...@@ -698,7 +760,7 @@ Datetime 03 13 00 00 |01 0C |03 00 00 00
Timestamp 03 0E 00 00 |01 07 |03 61 04 00 Timestamp 03 0E 00 00 |01 07 |03 61 04 00
Time 03 08 00 00 |01 0B |03 00 00 00 Time 03 08 00 00 |01 0B |03 00 00 00
Date 03 0A 00 00 |01 0A |03 00 00 00 Date 03 0A 00 00 |01 0A |03 00 00 00
@end example
@c The Index was empty, and ugly, so I removed it. (jcole, Sep 7, 2000) @c The Index was empty, and ugly, so I removed it. (jcole, Sep 7, 2000)
......
@\input texinfo @c -*-texinfo-*- \input texinfo @c -*-texinfo-*-
@c Copyright 1997-2001 TcX AB, Detron HB und MySQL Finland AB @c Copyright 1997-2001 TcX AB, Detron HB und MySQL Finland AB
@c @c
@c ********************************************************* @c *********************************************************
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