Implement process info collection on AIX

process/process_aix.go

@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//go:build aix
+
+package process
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/shirou/gopsutil/v4/cpu"
+	"github.com/shirou/gopsutil/v4/internal/common"
+	"github.com/shirou/gopsutil/v4/net"
+)
+
+// MemoryMapsStat is not available on AIX.
+type MemoryMapsStat struct{}
+
+// MemoryInfoExStat is not available on AIX.
+type MemoryInfoExStat struct{}
+
+func readPsinfo(ctx context.Context, pid int32) (*psinfo, error) {
+	f, err := os.Open(common.HostProcWithContext(ctx, strconv.Itoa(int(pid)), "psinfo"))
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	var psi psinfo
+	if err := binary.Read(f, binary.BigEndian, &psi); err != nil {
+		return nil, err
+	}
+	return &psi, nil
+}
+
+func nullTerminatedString(b []byte) string {
+	if idx := bytes.IndexByte(b, 0); idx >= 0 {
+		return string(b[:idx])
+	}
+	return string(b)
+}
+
+func pidsWithContext(ctx context.Context) ([]int32, error) {
+	dir, err := os.Open(common.HostProcWithContext(ctx))
+	if err != nil {
+		return nil, err
+	}
+	defer dir.Close()
+
+	names, err := dir.Readdirnames(-1)
+	if err != nil {
+		return nil, err
+	}
+
+	pids := make([]int32, 0, len(names))
+	for _, name := range names {
+		pid, err := strconv.ParseInt(name, 10, 32)
+		if err != nil {
+			continue // skip non-numeric entries (e.g. "net", "sys")
+		}
+		pids = append(pids, int32(pid))
+	}
+	return pids, nil
+}
+
+func ProcessesWithContext(ctx context.Context) ([]*Process, error) {
+	pids, err := pidsWithContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+	ret := make([]*Process, 0, len(pids))
+	for _, pid := range pids {
+		// create Process struct directly to avoid the redundant PidExists check
+		ret = append(ret, &Process{Pid: pid})
+	}
+	return ret, nil
+}
+
+func (p *Process) PpidWithContext(ctx context.Context) (int32, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return 0, err
+	}
+	// psinfo stores PIDs as uint64; safe to truncate to int32 on AIX where PIDs fit in 32 bits.
+	return int32(psi.Ppid), nil
+}
+
+func (p *Process) NameWithContext(ctx context.Context) (string, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return "", err
+	}
+	if name := nullTerminatedString(psi.Fname[:]); name != "" {
+		return name, nil
+	}
+	// PID 0 is the swapper/idle process; its Fname is empty but ps shows "swapper".
+	if p.Pid == 0 {
+		return "swapper", nil
+	}
+	return "", nil
+}
+
+func (*Process) TgidWithContext(_ context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (*Process) ExeWithContext(_ context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) CmdlineWithContext(ctx context.Context) (string, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return "", err
+	}
+	// Psargs is empty for kernel threads, fall back to Fname (the executable name),
+	// which is what ps uses as well.
+	if args := nullTerminatedString(psi.Psargs[:]); args != "" {
+		return args, nil
+	}
+	if name := nullTerminatedString(psi.Fname[:]); name != "" {
+		return name, nil
+	}
+	// PID 0 is the swapper/idle process, its Fname and Psargs are both empty
+	// but ps shows "swapper".
+	if p.Pid == 0 {
+		return "swapper", nil
+	}
+	return "", nil
+}
+
+func (p *Process) CmdlineSliceWithContext(ctx context.Context) ([]string, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	// Psargs is empty for kernel threads, fall back to Fname (the executable name),
+	// which is what ps uses as well.
+	args := nullTerminatedString(psi.Psargs[:])
+	if args == "" {
+		args = nullTerminatedString(psi.Fname[:])
+	}
+	// PID 0 is the swapper/idle process, its Fname and Psargs are both empty
+	// but ps shows "swapper".
+	if args == "" && p.Pid == 0 {
+		args = "swapper"
+	}
+	if args == "" {
+		return nil, nil
+	}
+	return strings.Fields(args), nil
+}
+
+func (p *Process) createTimeWithContext(ctx context.Context) (int64, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return 0, err
+	}
+	return psi.Start.Sec*1000 + int64(psi.Start.Nsec)/1000000, nil
+}
+
+func (*Process) CwdWithContext(_ context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) StatusWithContext(ctx context.Context) ([]string, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	return []string{convertStatusChar(string([]byte{psi.Lwp.Sname}))}, nil
+}
+
+func (*Process) ForegroundWithContext(_ context.Context) (bool, error) {
+	return false, common.ErrNotImplementedError
+}
+
+func (p *Process) UidsWithContext(ctx context.Context) ([]uint32, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	// psinfo stores UIDs as uint64; safe to truncate to uint32 on AIX where UIDs fit in 32 bits.
+	// real, effective, saved (psinfo doesn't expose saved, use real as fallback)
+	return []uint32{uint32(psi.Uid), uint32(psi.Euid), uint32(psi.Uid)}, nil
+}
+
+func (p *Process) GidsWithContext(ctx context.Context) ([]uint32, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	// psinfo stores GIDs as uint64; safe to truncate to uint32 on AIX where GIDs fit in 32 bits.
+	// real, effective, saved (psinfo doesn't expose saved, use real as fallback)
+	return []uint32{uint32(psi.Gid), uint32(psi.Egid), uint32(psi.Gid)}, nil
+}
+
+func (*Process) GroupsWithContext(_ context.Context) ([]uint32, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) TerminalWithContext(_ context.Context) (string, error) {
+	return "", common.ErrNotImplementedError
+}
+
+func (p *Process) NiceWithContext(ctx context.Context) (int32, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return 0, err
+	}
+	// Returns the raw pr_nice value from lwpsinfo_t, this is not the same as what ps displays
+	return int32(psi.Lwp.Nice), nil
+}
+
+func (*Process) IOniceWithContext(_ context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) RlimitWithContext(ctx context.Context) ([]RlimitStat, error) {
+	return p.RlimitUsageWithContext(ctx, false)
+}
+
+func (*Process) RlimitUsageWithContext(_ context.Context, _ bool) ([]RlimitStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) NumCtxSwitchesWithContext(_ context.Context) (*NumCtxSwitchesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) NumFDsWithContext(_ context.Context) (int32, error) {
+	return 0, common.ErrNotImplementedError
+}
+
+func (p *Process) NumThreadsWithContext(ctx context.Context) (int32, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return 0, err
+	}
+	return int32(psi.Nlwp), nil
+}
+
+func (*Process) ThreadsWithContext(_ context.Context) (map[int32]*cpu.TimesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) TimesWithContext(ctx context.Context) (*cpu.TimesStat, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	// psinfo only provides combined user+system time
+	combined := float64(psi.Time.Sec) + float64(psi.Time.Nsec)/1e9
+	return &cpu.TimesStat{
+		CPU:    "cpu",
+		User:   combined,
+		System: 0,
+	}, nil
+}
+
+func (*Process) CPUAffinityWithContext(_ context.Context) ([]int32, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) MemoryInfoWithContext(ctx context.Context) (*MemoryInfoStat, error) {
+	psi, err := readPsinfo(ctx, p.Pid)
+	if err != nil {
+		return nil, err
+	}
+	// pr_size and pr_rssize are in KB per documentation
+	return &MemoryInfoStat{
+		RSS: psi.Rssize * 1024,
+		VMS: psi.Size * 1024,
+	}, nil
+}
+
+func (*Process) MemoryInfoExWithContext(_ context.Context) (*MemoryInfoExStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) PageFaultsWithContext(_ context.Context) (*PageFaultsStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (p *Process) ChildrenWithContext(ctx context.Context) ([]*Process, error) {
+	pids, err := pidsWithContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+	ret := make([]*Process, 0)
+	for _, pid := range pids {
+		psi, err := readPsinfo(ctx, pid)
+		if err != nil {
+			continue
+		}
+		// psinfo stores PIDs as uint64; safe to truncate to int32 on AIX where PIDs fit in 32 bits.
+		if int32(psi.Ppid) == p.Pid {
+			// create Process struct directly to avoid the redundant PidExists check
+			ret = append(ret, &Process{Pid: pid})
+		}
+	}
+	return ret, nil
+}
+
+func (*Process) OpenFilesWithContext(_ context.Context) ([]OpenFilesStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) ConnectionsWithContext(_ context.Context) ([]net.ConnectionStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) ConnectionsMaxWithContext(_ context.Context, _ int) ([]net.ConnectionStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) MemoryMapsWithContext(_ context.Context, _ bool) (*[]MemoryMapsStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) IOCountersWithContext(_ context.Context) (*IOCountersStat, error) {
+	return nil, common.ErrNotImplementedError
+}
+
+func (*Process) EnvironWithContext(_ context.Context) ([]string, error) {
+	return nil, common.ErrNotImplementedError
+}