msg.c File Reference

Classes
struct	msq_info_t
	Message queue management structure. More...

Macros
#define	__DEBUG_HEADER__   "[IPCmsg]"
	Change header.
#define	__DEBUG_LEVEL__   LOGLEVEL_NOTICE
	Set log level.

Functions
static msq_info_t *	__msq_info_alloc (key_t key, int msqflg)
	Allocates the memory for message queue structure. More...
static void	__msq_info_dealloc (msq_info_t *msq_info)
	Frees the memory of a message queue management structure. More...
static msq_info_t *	__list_find_msq_info_by_id (int msqid)
	Searches for the message queue with the given id. More...
static msq_info_t *	__list_find_msq_info_by_key (key_t key)
	Searches for the message queue with the given key. More...
static void	__list_add_msq_info (msq_info_t *msq_info)
	Adds the structure to the global list. More...
static void	__list_remove_msq_info (msq_info_t *msq_info)
	Removes the structure from the global list. More...
static void	__msq_info_push_message (msq_info_t *msq_info, struct msg *message)
	Pushes a messages inside the message queue. More...
static void	__msq_info_remove_message (msq_info_t *msq_info, struct msg *message)
	Removes the message from the message queue. More...
int	msq_init (void)
	Iinitializes the message queue system. More...
int	sys_msgget (key_t key, int msgflg)
int	sys_msgsnd (int msqid, const void *msgp, size_t msgsz, int msgflg)
ssize_t	sys_msgrcv (int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg)
int	sys_msgctl (int msqid, int cmd, struct msqid_ds *buf)
ssize_t	procipc_msg_read (vfs_file_t *file, char *buf, off_t offset, size_t nbyte)
	Read function for the proc system. More...

Variables
static int	__msq_id = 0
	A value to compute the message queue ID.
list_head	msq_list
	List of all current active Message queues.

Detailed Description

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

__list_add_msq_info()

static void __list_add_msq_info ( msq_info_t *  msq_info )

inlinestatic

Adds the structure to the global list.

Parameters

msq_info

the structure to add.

__list_find_msq_info_by_id()

static msq_info_t* __list_find_msq_info_by_id ( int  msqid )

inlinestatic

Searches for the message queue with the given id.

Parameters

msqid

the id we are searching.

Returns

the message queue with the given id.

__list_find_msq_info_by_key()

static msq_info_t* __list_find_msq_info_by_key ( key_t  key )

inlinestatic

Searches for the message queue with the given key.

Parameters

key	the key we are searching.

Returns

the message queue with the given key.

__list_remove_msq_info()

static void __list_remove_msq_info ( msq_info_t *  msq_info )

inlinestatic

Removes the structure from the global list.

Parameters

msq_info

the structure to remove.

__msq_info_alloc()

static msq_info_t* __msq_info_alloc ( key_t  key, int  msqflg  )

inlinestatic

Allocates the memory for message queue structure.

Parameters

key	IPC_KEY associated with message queue.
msqflg	flags used to create message queue.

Returns

a pointer to the allocated message queue structure.

__msq_info_dealloc()

static void __msq_info_dealloc ( msq_info_t *  msq_info )

inlinestatic

Frees the memory of a message queue management structure.

Parameters

msq_info

pointer to the message queue management structure.

__msq_info_push_message()

static void __msq_info_push_message ( msq_info_t *  msq_info, struct msg *  message  )

inlinestatic

Pushes a messages inside the message queue.

Parameters

msq_info	the structure that will contain the message.
message	the message to push.

__msq_info_remove_message()

static void __msq_info_remove_message ( msq_info_t *  msq_info, struct msg *  message  )

inlinestatic

Removes the message from the message queue.

Parameters

msq_info	the structure that contains the message.
message	the message to remove.

msq_init()

int msq_init

(

void

)

Iinitializes the message queue system.

Returns

0 on success, 1 on failure.

procipc_msg_read()

ssize_t procipc_msg_read	(	vfs_file_t *	file,
		char *	buf,
		off_t	offset,
		size_t	nbyte
	)

Read function for the proc system.

Parameters

file	The file.
buf	Buffer where the read content must be placed.
offset	Offset from which we start reading from the file.
nbyte	The number of bytes to read.

Returns

The number of red bytes.