Golang semctl_buf Examples

Example #1

File: sem.go Project: jmptrader/go-sysvipc

// Set updates parameters of the semaphore set.
func (ss *SemaphoreSet) Set(ssi *SemSetInfo) error {
	sds := &C.struct_semid_ds{
		sem_perm: C.struct_ipc_perm{
			uid:  C.__uid_t(ssi.Perms.OwnerUID),
			gid:  C.__gid_t(ssi.Perms.OwnerGID),
			mode: C.ushort(ssi.Perms.Mode & 0x1FF),
		},
	}

	rc, err := C.semctl_buf(C.int(ss.id), C.IPC_SET, sds)
	if rc == -1 {
		return err
	}
	return nil
}

Example #2

File: sem.go Project: jmptrader/go-sysvipc

// Stat produces information about the semaphore set.
func (ss *SemaphoreSet) Stat() (*SemSetInfo, error) {
	sds := C.struct_semid_ds{}

	rc, err := C.semctl_buf(C.int(ss.id), C.IPC_STAT, &sds)
	if rc == -1 {
		return nil, err
	}

	ssinf := SemSetInfo{
		Perms: IpcPerms{
			OwnerUID:   int(sds.sem_perm.uid),
			OwnerGID:   int(sds.sem_perm.gid),
			CreatorUID: int(sds.sem_perm.cuid),
			CreatorGID: int(sds.sem_perm.cgid),
			Mode:       uint16(sds.sem_perm.mode),
		},
		LastOp:     time.Unix(int64(sds.sem_otime), 0),
		LastChange: time.Unix(int64(sds.sem_ctime), 0),
		Count:      uint(sds.sem_nsems),
	}
	return &ssinf, nil
}