операция отсоединения разделяемой памяти XSI (XSI shared memory detach operation)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's 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.
Имя (Name)
shmdt — XSI shared memory detach operation
Синопсис (Synopsis)
#include <sys/shm.h>
int shmdt(const void *shmaddr);
Описание (Description)
The shmdt() function operates on XSI shared memory (see the Base
Definitions volume of POSIX.1‐2017, Section 3.346, Shared Memory
Object). It is unspecified whether this function interoperates
with the realtime interprocess communication facilities defined
in Section 2.8, Realtime.
The shmdt() function detaches the shared memory segment located
at the address specified by shmaddr from the address space of the
calling process.
Возвращаемое значение (Return value)
Upon successful completion, shmdt() shall decrement the value of
shm_nattch in the data structure associated with the shared
memory ID of the attached shared memory segment and return 0.
Also, the shm_dtime timestamp shall be set to the current time,
as described in Section 2.7.1, IPC General Description.
Otherwise, the shared memory segment shall not be detached,
shmdt() shall return -1, and errno shall be set to indicate the
error.
Ошибки (Error)
The shmdt() function shall fail if:
EINVAL The value of shmaddr is not the data segment start address
of a shared memory segment.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
The POSIX Realtime Extension defines alternative interfaces for
interprocess communication. Application developers who need to
use IPC should design their applications so that modules using
the IPC routines described in Section 2.7, XSI Interprocess
Communication can be easily modified to use the alternative
interfaces.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
Section 2.7, XSI Interprocess Communication, Section 2.8,
Realtime, exec(1p), exit(3p), fork(3p), shmat(3p), shmctl(3p),
shmget(3p), shm_open(3p), shm_unlink(3p)
The Base Definitions volume of POSIX.1‐2017, Section 3.346,
Shared Memory Object, sys_shm.h(0p)
