[ новости /+++ | форум | теги | ]

NAME

sys/ipc.h - XSI interprocess communication access structure
 

SYNOPSIS

#include <sys/ipc.h>  

DESCRIPTION

The <sys/ipc.h> header is used by three mechanisms for XSI interprocess communication (IPC): messages, semaphores, and shared memory. All use a common structure type, ipc_perm, to pass information used in determining permission to perform an IPC operation.

The ipc_perm structure shall contain the following members:

uid_t    uid    Owner's user ID. 
gid_t    gid    Owner's group ID. 
uid_t    cuid   Creator's user ID. 
gid_t    cgid   Creator's group ID. 
mode_t   mode   Read/write permission. 

The uid_t, gid_t, mode_t, and key_t types shall be defined as described in <sys/types.h> .

Definitions shall be provided for the following constants:

Mode bits:

IPC_CREAT

Create entry if key does not exist.

IPC_EXCL

Fail if key exists.

IPC_NOWAIT

Error if request must wait.

Keys:

IPC_PRIVATE

Private key.

Control commands:

IPC_RMID

Remove identifier.

IPC_SET

Set options.

IPC_STAT

Get options.

The following shall be declared as a function and may also be defined as a macro. A function prototype shall be provided.

key_t  ftok(const char *, int);

The following sections are informative.  

APPLICATION USAGE

None.  

RATIONALE

None.  

FUTURE DIRECTIONS

None.  

SEE ALSO

<sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, ftok()  

COPYRIGHT

Index

NAME

SYNOPSIS

DESCRIPTION

APPLICATION USAGE

RATIONALE

FUTURE DIRECTIONS

SEE ALSO

COPYRIGHT

Партнёры:

Хостинг: