sys/ipc.h

NAME

sys/ipc.h - XSI interprocess communication access structure

SYNOPSIS

#include <sys/ipc.h>

DESCRIPTION

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

    git_t     cgit Creator's group ID.

    mode_t    mode Read/write permission.

The uid_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_NOEAIT

    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 Systen Interfaces volume of IEEE Std 1003.1-2001, ftok()