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System Calls shmctl(2)
NAME
shmctl - shared memory control operations
SYNOPSIS
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
int shmctl(int shmid, int cmd, struct shmid_ds *buf);
DESCRIPTION
The shmctl() function provides a variety of shared memory
control operations as specified by cmd. The permission
required for a shared memory control operation is given as
{token}, where token is the type of permission needed. The
types of permission are interpreted as follows:
00400 READ by user
00200 WRITE by user
00040 READ by group
00020 WRITE by group
00004 READ by others
00002 WRITE by others
See the Shared Memory Operation Permissions section of
intro(2) for more information.
The following operations require the specified tokens:
IPC_STAT Place the current value of each member of
the data structure associated with shmid
into the structure pointed to by buf. The
contents of this structure are defined in
intro(2). {READ}
IPC_SET Set the value of the following members of
the data structure associated with shmid to
the corresponding value found in the struc-
ture pointed to by buf:
shm_perm.uid
shm_perm.gid
shm_perm.mode /* access permission bits only */
This command can be executed only by a pro-
cess that has appropriate privileges or an
effective user ID equal to the value of
shm_perm.cuid or shm_perm.uid in the data
structure associated with shmid.
SunOS 5.10 Last change: 1 Feb 2003 1
System Calls shmctl(2)
IPC_RMID Remove the shared memory identifier speci-
fied by shmid from the system. The segment
referenced by the identifier will be des-
troyed when all processes with the segment
attached have either detached the segment or
exited. If the segment is not attached to
any process when IPC_RMID is invoked, it
will be destroyed immediately. This command
can be executed only by a process that has
appropriate privileges or an effective user
ID equal to the value of shm_perm.cuid or
shm_perm.uid in the data structure associ-
ated with shmid.
SHM_LOCK Lock the shared memory segment specified by
shmid in memory. This command can be exe-
cuted only by a process that has appropriate
privileges.
SHM_UNLOCK Unlock the shared memory segment specified
by shmid. This command can be executed only
by a process that has appropriate
privileges.
A shared memory segment must be explicitly removed using
IPC_RMID before the system can deallocate it and the
resources it uses.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is
returned and errno is set to indicate the error.
ERRORS
The shmctl() function will fail if:
EACCES The cmd argument is equal to IPC_STAT and
{READ} operation permission is denied to the
calling process.
EFAULT The buf argument points to an illegal
address.
SunOS 5.10 Last change: 1 Feb 2003 2
System Calls shmctl(2)
EINVAL The shmid argument is not a valid shared
memory identifier; or the cmd argument is
not a valid command or is IPC_SET and
shm_perm.uid or shm_perm.gid is not valid.
ENOMEM The cmd argument is equal to SHM_LOCK and
there is not enough memory.
EOVERFLOW The cmd argument is IPC_STAT and uid or gid
is too large to be stored in the structure
pointed to by buf.
EPERM The cmd argument is equal to IPC_RMID or
IPC_SET, the effective user ID of the cal-
ling process is not equal to the value of
shm_perm.cuid or shm_perm.uid in the data
structure associated with shmid, and
{PRIV_IPC_OWNER} is not asserted in the
effective set of the calling process.
The cmd argument is equal to SHM_LOCK or
SHM_UNLOCK and {PRIV_PROC_LOCK_MEMORY} is
not asserted in the effective set of the
calling process.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
ipcs(1), intro(2), shmget(2), shmop(2), attributes(5),
privileges(5), standards(5)
SunOS 5.10 Last change: 1 Feb 2003 3
Man(1) output converted with
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This page was generated on Wed Sep 12 11:27:09 GMT 2007
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