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Man Pages


Manual Reference Pages  -  SHMAT (2)

NAME

shmat, shmdt - attach or detach shared memory

CONTENTS

Library
Synopsis
Description
Return Values
Errors

LIBRARY


.Lb libc

SYNOPSIS


.In sys/types.h
.In sys/ipc.h
.In sys/shm.h void * shmat int shmid const void *addr int flag int shmdt const void *addr

DESCRIPTION

The shmat system call attaches the shared memory segment identified by shmid to the calling process’s address space. The address where the segment is attached is determined as follows:
  • If addr is 0, the segment is attached at an address selected by the kernel.
  • If addr is nonzero and SHM_RND is not specified in flag, the segment is attached the specified address.
  • If addr is specified and SHM_RND is specified, addr is rounded down to the nearest multiple of SHMLBA.

The shmdt system call detaches the shared memory segment at the address specified by addr from the calling process’s address space.

RETURN VALUES

Upon success, shmat returns the address where the segment is attached; otherwise, -1 is returned and errno is set to indicate the error.


.Rv -std shmdt

ERRORS

The shmat system call will fail if:
[EINVAL]
  No shared memory segment was found corresponding to shmid.
[EINVAL]
  The addr argument was not an acceptable address.

The shmdt system call will fail if:
[EINVAL]
  The addr argument does not point to a shared memory segment.

SEE ALSO

shmctl(2), shmget(2)
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