GNU Info

(ipc.info)shmdt

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Enter node , (file) or (file)node

shmdt
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     int shmdt (char *shmaddr);

   * shmaddr : attach address of segment (returned by shmat).

   * returns : 0 on success. -1 on failure.

   An attached segment is detached and `shm_nattch' decremented. The
occupied region in user space is unmapped. The segment is destroyed if
it is marked for destruction and `shm_nattch' is 0.  `shm_lpid' and
`shm_dtime' are updated.

Errors:
EINVAL : No shared memory segment attached at shmaddr.