// Remove marks the shared memory segment for removal.
// It will be removed when all attachments have been closed.
func (shm *SharedMem) Remove() error {
rc, err := C.shmctl(C.int(shm.id), C.IPC_RMID, nil)
if rc == -1 {
return err
}
return nil
}
// Stat produces meta information about the shared memory segment.
func (shm *SharedMem) Stat() (*SHMInfo, error) {
shmds := C.struct_shmid_ds{}
rc, err := C.shmctl(C.int(shm.id), C.IPC_STAT, &shmds)
if rc == -1 {
return nil, err
}
shminf := SHMInfo{
Perms: IpcPerms{
OwnerUID: int(shmds.shm_perm.uid),
OwnerGID: int(shmds.shm_perm.gid),
CreatorUID: int(shmds.shm_perm.cuid),
CreatorGID: int(shmds.shm_perm.cgid),
Mode: uint16(shmds.shm_perm.mode),
},
SegmentSize: uint(shmds.shm_segsz),
LastAttach: time.Unix(int64(shmds.shm_atime), 0),
LastDetach: time.Unix(int64(shmds.shm_dtime), 0),
LastChange: time.Unix(int64(shmds.shm_ctime), 0),
CreatorPID: int(shmds.shm_cpid),
LastUserPID: int(shmds.shm_lpid),
CurrentAttaches: uint(shmds.shm_nattch),
}
return &shminf, nil
}
// Set updates parameters of the shared memory segment.
func (shm *SharedMem) Set(info *SHMInfo) error {
shmds := &C.struct_shmid_ds{
shm_perm: C.struct_ipc_perm{
uid: C.__uid_t(info.Perms.OwnerUID),
gid: C.__gid_t(info.Perms.OwnerGID),
mode: C.ushort(info.Perms.Mode & 0x1FF),
},
}
rc, err := C.shmctl(C.int(shm.id), C.IPC_SET, shmds)
if rc == -1 {
return err
}
return nil
}
