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<sys/shm.h>(P) POSIX Programmer's Manual <sys/shm.h>(P)
NAME
sys/shm.h - XSI shared memory facility
SYNOPSIS
#include <sys/shm.h>
DESCRIPTION
The <sys/shm.h> header shall define the following symbolic constants:
SHM_RDONLY
Attach read-only (else read-write).
SHM_RND
Round attach address to SHMLBA.
The <sys/shm.h> header shall define the following symbolic value:
SHMLBA Segment low boundary address multiple.
The following data types shall be defined through typedef:
shmatt_t
Unsigned integer used for the number of current attaches that
must be able to store values at least as large as a type
unsigned short.
The shmid_ds structure shall contain the following members:
struct ipc_perm shm_perm Operation permission structure.
size_t shm_segsz Size of segment in bytes.
pid_t shm_lpid Process ID of last shared memory operation.
pid_t shm_cpid Process ID of creator.
shmatt_t shm_nattch Number of current attaches.
time_t shm_atime Time of last shmat
().
time_t shm_dtime Time of last shmdt
().
time_t shm_ctime Time of last change by shmctl
().
The pid_t, time_t, key_t, and size_t types shall be defined as
described in <sys/types.h> .
The following shall be declared as functions and may also be defined as
macros. Function prototypes shall be provided.
void *shmat(int, const void *, int);
int shmctl(int, int, struct shmid_ds *);
int shmdt(const void *);
int shmget(key_t, size_t, int);
In addition, all of the symbols from <sys/ipc.h> shall be defined when
this header is included.
The following sections are informative.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<sys/ipc.h> , <sys/types.h> , the System Interfaces volume of
IEEE Std 1003.1-2001, shmat(), shmctl(), shmdt(), shmget()
COPYRIGHT
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 2003 <sys/shm.h>(P)
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This page was generated on Sat Sep 8 16:41:09 GMT 2007
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