net_serv.cc File Reference

#include <my_global.h>
#include <mysql.h>
#include <mysql_com.h>
#include <mysqld_error.h>
#include <my_sys.h>
#include <m_string.h>
#include <my_net.h>
#include <violite.h>
#include <signal.h>
#include <errno.h>
#include "probes_mysql.h"
#include <algorithm>

Include dependency graph for net_serv.cc:

Go to the source code of this file.

Macros
#define	update_statistics(A)
#define	thd_increment_bytes_sent(N)
#define	VIO_SOCKET_ERROR   ((size_t) -1)
#define	MAX_PACKET_LENGTH   (256L*256L*256L-1)

Functions
my_bool	my_net_init (NET *net, Vio *vio)
void	net_end (NET *net)
my_bool	net_realloc (NET *net, size_t length)
void	net_clear (NET *net, my_bool check_buffer __attribute__((unused)))
my_bool	net_flush (NET *net)
my_bool	my_net_write (NET *net, const uchar *packet, size_t len)
my_bool	net_write_command (NET *net, uchar command, const uchar *header, size_t head_len, const uchar *packet, size_t len)
my_bool	net_write_packet (NET *net, const uchar *packet, size_t length)
ulong	my_net_read (NET *net)
void	my_net_set_read_timeout (NET *net, uint timeout)
void	my_net_set_write_timeout (NET *net, uint timeout)

Detailed Description

This file is the net layer API for the MySQL client/server protocol.

Write and read of logical packets to/from socket.

Writes are cached into net_buffer_length big packets. Read packets are reallocated dynamicly when reading big packets. Each logical packet has the following pre-info: 3 byte length & 1 byte package-number.

This file needs to be written in C as it's used by the libmysql client as a C file.

Definition in file net_serv.cc.

Function Documentation

my_bool my_net_init	(	NET *	net,
		Vio *	vio
	)

Init with packet info.

Definition at line 98 of file net_serv.cc.

Here is the caller graph for this function:

ulong my_net_read

(

NET *

net

)

Read a packet from the client/server and return it without the internal package header.

If the packet is the first packet of a multi-packet packet (which is indicated by the length of the packet = 0xffffff) then all sub packets are read and concatenated.

If the packet was compressed, its uncompressed and the length of the uncompressed packet is returned.

Returns

The function returns the length of the found packet or packet_error. net->read_pos points to the read data.

Definition at line 878 of file net_serv.cc.

Here is the caller graph for this function:

my_bool my_net_write	(	NET *	net,
		const uchar *	packet,
		size_t	len
	)

Write a logical packet with packet header.

Format: Packet length (3 bytes), packet number (1 byte) When compression is used, a 3 byte compression length is added.

Note

If compression is used, the original packet is modified!

Definition at line 279 of file net_serv.cc.

Here is the caller graph for this function:

void net_clear	(	NET *	net,
		my_bool check_buffer	__attribute__(unused)
	)

Clear (reinitialize) the NET structure for a new command.

Remarks

Performs debug checking of the socket buffer to ensure that the protocol sequence is correct.

Parameters

net	NET handler
check_buffer	Whether to check the socket buffer.

Definition at line 193 of file net_serv.cc.

my_bool net_flush

(

NET *

net

)

Flush write_buffer if not empty.

Definition at line 213 of file net_serv.cc.

Here is the call graph for this function:

Here is the caller graph for this function:

my_bool net_realloc	(	NET *	net,
		size_t	length
	)

Realloc the packet buffer.

Definition at line 141 of file net_serv.cc.

my_bool net_write_command	(	NET *	net,
		uchar	command,
		const uchar *	header,
		size_t	head_len,
		const uchar *	packet,
		size_t	len
	)

Send a command to the server.

The reason for having both header and packet is so that libmysql can easy add a header to a special command (like prepared statements) without having to re-alloc the string.

As the command is part of the first data packet, we have to do some data juggling to put the command in there, without having to create a new packet.

This function will split big packets into sub-packets if needed. (Each sub packet can only be 2^24 bytes)

Parameters

net	NET handler
command	Command in MySQL server (enum enum_server_command)
header	Header to write after command
head_len	Length of header
packet	Query or parameter to query
len	Length of packet

Return values

0	ok
1	error

Definition at line 353 of file net_serv.cc.

Here is the call graph for this function:

my_bool net_write_packet	(	NET *	net,
		const uchar *	packet,
		size_t	length
	)

Write a MySQL protocol packet to the network handler.

Parameters

net	NET handler.
packet	The packet to write.
length	Length of the packet.

Remarks

The packet might be encapsulated into a compressed packet.

Returns

TRUE on error, FALSE on success.

Definition at line 596 of file net_serv.cc.

Here is the caller graph for this function: