//go:build unix

package ispriv

import (
	`os`

	`github.com/shirou/gopsutil/v4/process`
)

/*
	GetProcIDs returns a ProcIDs from a given PID. An error will be raised if the process ID doesn't exist.
	A negative value indicates "self" (see also GetProcIDsSelf).

	Note that if you are not EUID == 0 (root) or you/the sudo target user does not own the process,
	the returning ProcIDs is HIGHLY LIKELY to be very inaccurate.
*/
func GetProcIDs(pid int32) (p *ProcIDs, err error) {

	var proc ProcIDs
	var ids []uint32

	if pid < 0 {
		pid = int32(os.Getpid())
	}

	if proc.proc, err = process.NewProcess(pid); err != nil {
		return
	}
	if ids, err = proc.proc.Gids(); err != nil {
		return
	}
	p.gids = &IdInfo{
		real:       uint(ids[0]),
		effective:  uint(ids[1]),
		savedSet:   uint(ids[2]),
		filesystem: nil,
	}
	if len(ids) == 4 {
		p.gids.filesystem = new(uint)
		*p.gids.filesystem = uint(ids[3])
	}
	if ids, err = proc.proc.Uids(); err != nil {
		return
	}
	p.uids = &IdInfo{
		real:       uint(ids[0]),
		effective:  uint(ids[1]),
		savedSet:   uint(ids[2]),
		filesystem: nil,
	}
	if len(ids) == 4 {
		p.uids.filesystem = new(uint)
		*p.uids.filesystem = uint(ids[3])
	}

	p = &proc

	return
}

// GetProcIDsSelf returns a ProcIDs from the current process' PID.
func GetProcIDsSelf() (p *ProcIDs, err error) {

	p, err = GetProcIDs(int32(os.Getpid()))

	return
}