ipc.h(3HEAD)							      Headers							      ipc.h(3HEAD)

NAME

       ipc.h, ipc - XSI interprocess communication access structure

SYNOPSIS

       #include <sys/ipc.h>

DESCRIPTION

       The <sys/ipc.h> header is used by three mechanisms for 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 contains 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 are defined as described in <sys/types.h>. See types.h(3HEAD).

       Definitions are provided for the constants listed below.

       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.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ftok(3C), types.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    10 Sep 2004 						      ipc.h(3HEAD)