AttachToShmSegment used to attach to the existing shared memory segment by shared memory ID.

The args are: key - int, used as uniques identifier for the shared memory segment size - uint, size in bytes to allocate permission - int, if passed zero, 0600 will be used by default flags - IPC_CREAT, IPC_EXCL, IPC_NOWAIT.

create if key is nonexistent */nolint:golint,stylecheck.

fail if key exists */nolint:golint,stylecheck.

return error on wait */nolint:golint,stylecheck.

Read by group.

Read by owner.

Write by group.

Write by owner.

execution access */nolint:golint,stylecheck.

lock segment (root only) */nolint:golint,stylecheck.

or S_IRUGO from <linux/stat.h> */nolint:golint,stylecheck.

attach read-only else read-write */nolint:golint,stylecheck.

take-over region on attach */nolint:golint,stylecheck.

round attach address to SHMLBA */nolint:golint,stylecheck.

unlock segment (root only) */nolint:golint,stylecheck.

or S_IWUGO from <linux/stat.h> */nolint:golint,stylecheck.