This manual page is part of the POSIX Programmers Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
sys/ipc.h - XSI interprocess communication access structure
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 Owners user ID. gid_t gid Owners group ID. uid_t cuid Creators user ID. gid_t cgid Creators 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:
The following shall be declared as a function and may also be defined as a macro. A function prototype shall be provided.
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.
key_t ftok(const char *, int);
The following sections are informative.
<sys/types.h> , the System Interfaces volume of IEEE Std 1003.1-2001, ftok()
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
|IEEE/The Open Group||<sys/ipc.h> (P)||2003|