Add support for OpenBSD (#7)

process_openbsd.go

@@ -0,0 +1,302 @@
+// +build openbsd,amd64
+
+package ps
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"syscall"
+	"unsafe"
+)
+
+// copied from sys/sysctl.h
+const (
+	CTL_KERN       = 1
+	KERN_PROC      = 66
+	KERN_PROC_PID  = 1
+	KERN_PROC_ARGS = 55
+	KERN_PROC_ARGV = 1
+	KERN_PROC_ALL  = 0
+)
+
+/* Generated via cgo:
+
+$ cat /tmp/gen_defs.go
+// +build ignore
+package ps
+// #include <sys/types.h>
+// #include <sys/sysctl.h>
+import "C"
+
+type Kinfo_proc C.struct_kinfo_proc
+
+$ go tool cgo -godefs temp.go
+
+*/
+
+type Kinfo_proc struct {
+	Ki_forw       uint64
+	Ki_back       uint64
+	Ki_paddr      uint64
+	Ki_addr       uint64
+	Ki_fd         uint64
+	Ki_stats      uint64
+	Ki_limit      uint64
+	Ki_vmspace    uint64
+	Ki_sigacts    uint64
+	Ki_sess       uint64
+	Ki_tsess      uint64
+	Ki_ru         uint64
+	Ki_eflag      int32
+	Ki_exitsig    int32
+	Ki_flag       int32
+	Ki_pid        int32
+	Ki_ppid       int32
+	Ki_sid        int32
+	Ki_x_pgid     int32
+	Ki_tpgid      int32
+	Ki_uid        uint32
+	Ki_ruid       uint32
+	Ki_gid        uint32
+	Ki_rgid       uint32
+	Ki_groups     [16]uint32
+	Ki_ngroups    int16
+	Ki_jobc       int16
+	Ki_tdev       uint32
+	Ki_estcpu     uint32
+	Ki_rtime_sec  uint32
+	Ki_rtime_usec uint32
+	Ki_cpticks    int32
+	Ki_pctcpu     uint32
+	Ki_swtime     uint32
+	Ki_slptime    uint32
+	Ki_schedflags int32
+	Ki_uticks     uint64
+	Ki_sticks     uint64
+	Ki_iticks     uint64
+	Ki_tracep     uint64
+	Ki_traceflag  int32
+	Ki_holdcnt    int32
+	Ki_siglist    int32
+	Ki_sigmask    uint32
+	Ki_sigignore  uint32
+	Ki_sigcatch   uint32
+	Ki_stat       int8
+	Ki_priority   uint8
+	Ki_usrpri     uint8
+	Ki_nice       uint8
+	Ki_xstat      uint16
+	Ki_acflag     uint16
+	//Ki_comm		[24]int8
+	Ki_comm         [20]byte
+	Ki_wmesg        [8]int8
+	Ki_wchan        uint64
+	Ki_login        [32]int8
+	Ki_vm_rssize    int32
+	Ki_vm_tsize     int32
+	Ki_vm_dsize     int32
+	Ki_vm_ssize     int32
+	Ki_uvalid       int64
+	Ki_ustart_sec   uint64
+	Ki_ustart_usec  uint32
+	Ki_uutime_sec   uint32
+	Ki_uutime_usec  uint32
+	Ki_ustime_sec   uint32
+	Ki_ustime_usec  uint32
+	Ki_pad_cgo_0    [4]byte
+	Ki_uru_maxrss   uint64
+	Ki_uru_ixrss    uint64
+	Ki_uru_idrss    uint64
+	Ki_uru_isrss    uint64
+	Ki_uru_minflt   uint64
+	Ki_uru_majflt   uint64
+	Ki_uru_nswap    uint64
+	Ki_uru_inblock  uint64
+	Ki_uru_oublock  uint64
+	Ki_uru_msgsnd   uint64
+	Ki_uru_msgrcv   uint64
+	Ki_uru_nsignals uint64
+	Ki_uru_nvcsw    uint64
+	Ki_uru_nivcsw   uint64
+	Ki_uctime_sec   uint32
+	Ki_uctime_usec  uint32
+	Ki_psflags      int32
+	Ki_spare        int32
+	Ki_svuid        uint32
+	Ki_svgid        uint32
+	Ki_emul         [8]int8
+	Ki_rlim_rss_cur uint64
+	Ki_cpuid        uint64
+	Ki_vm_map_size  uint64
+	Ki_tid          int32
+	Ki_rtableid     uint32
+}
+
+var proc_k_size = unsafe.Sizeof(Kinfo_proc{})
+
+// UnixProcess is an implementation of Process that contains Unix-specific
+// fields and information.
+type UnixProcess struct {
+	pid   int
+	ppid  int
+	state rune
+	pgrp  int
+	sid   int
+
+	binary string
+}
+
+// Pid returns process id
+func (p *UnixProcess) Pid() int {
+	return p.pid
+}
+
+// PPid returns parent process id
+func (p *UnixProcess) PPid() int {
+	return p.ppid
+}
+
+// Executable returns process executable name
+func (p *UnixProcess) Executable() string {
+	return p.binary
+}
+
+// Path returns path to process executable
+func (p *UnixProcess) Path() (string, error) {
+	// On OpenBSD we don't have the actual path of a binary, the next
+	// best thing we can do is walk $PATH to hopefully find the binary.
+	// More info here: https://github.com/kardianos/osext/commit/b4814f465fb1f92d46e37f7ef84d732ece7c3e3a
+	return "", fmt.Errorf("Unsupported")
+}
+
+// Refresh reloads all the data associated with this process.
+func (p *UnixProcess) Refresh() error {
+	mib := []int32{CTL_KERN, KERN_PROC, KERN_PROC_PID, int32(p.pid), int32(proc_k_size), 1}
+
+	buf, length, err := call_syscall(mib)
+	if err != nil {
+		return err
+	}
+	if length != uint64(proc_k_size) {
+		return err
+	}
+
+	k, err := parse_kinfo_proc(buf)
+	if err != nil {
+		return err
+	}
+
+	p.ppid, p.pgrp, p.sid, p.binary = copy_params(&k)
+	return nil
+}
+
+func copy_params(k *Kinfo_proc) (int, int, int, string) {
+	n := -1
+	for i, b := range k.Ki_comm {
+		if b == 0 {
+			break
+		}
+		n = i + 1
+	}
+	comm := string(k.Ki_comm[:n])
+
+	return int(k.Ki_ppid), int(k.Ki_x_pgid), int(k.Ki_sid), comm
+}
+
+func findProcess(pid int) (Process, error) {
+	mib := []int32{CTL_KERN, KERN_PROC, KERN_PROC_PID, int32(pid), int32(proc_k_size), 1}
+
+	_, _, err := call_syscall(mib)
+	if err != nil {
+		return nil, err
+	}
+
+	return newUnixProcess(pid)
+}
+
+func processes() ([]Process, error) {
+	results := make([]Process, 0, 50)
+
+	mib := []int32{CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0, int32(proc_k_size), 400}
+	buf, length, err := call_syscall(mib)
+	if err != nil {
+		return results, err
+	}
+
+	// get kinfo_proc size
+	procinfo_len := int(proc_k_size)
+	count := int(length / uint64(proc_k_size))
+
+	// parse buf to procs
+	for i := 0; i < count; i++ {
+		b := buf[i*procinfo_len : i*procinfo_len+procinfo_len]
+		k, err := parse_kinfo_proc(b)
+		if err != nil {
+			continue
+		}
+		p, err := newUnixProcess(int(k.Ki_pid))
+		if err != nil {
+			continue
+		}
+		p.ppid, p.pgrp, p.sid, p.binary = copy_params(&k)
+
+		results = append(results, p)
+	}
+
+	return results, nil
+}
+
+func parse_kinfo_proc(buf []byte) (Kinfo_proc, error) {
+	var k Kinfo_proc
+	br := bytes.NewReader(buf)
+	err := binary.Read(br, binary.LittleEndian, &k)
+	if err != nil {
+		return k, err
+	}
+
+	return k, nil
+}
+
+func call_syscall(mib []int32) ([]byte, uint64, error) {
+	miblen := uint64(len(mib))
+
+	// get required buffer size
+	length := uint64(0)
+	_, _, err := syscall.RawSyscall6(
+		syscall.SYS___SYSCTL,
+		uintptr(unsafe.Pointer(&mib[0])),
+		uintptr(miblen),
+		0,
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		b := make([]byte, 0)
+		return b, length, err
+	}
+	if length == 0 {
+		b := make([]byte, 0)
+		return b, length, err
+	}
+	// get proc info itself
+	buf := make([]byte, length)
+	_, _, err = syscall.RawSyscall6(
+		syscall.SYS___SYSCTL,
+		uintptr(unsafe.Pointer(&mib[0])),
+		uintptr(miblen),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&length)),
+		0,
+		0)
+	if err != 0 {
+		return buf, length, err
+	}
+
+	return buf, length, nil
+}
+
+func newUnixProcess(pid int) (*UnixProcess, error) {
+	p := &UnixProcess{pid: pid}
+	return p, p.Refresh()
+}

process_openbsd_test.go

@@ -0,0 +1,28 @@
+// +build openbsd
+
+package ps
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFindProcessOpenBSD(t *testing.T) {
+	proc := testFindProcess(t, "go-ps.test")
+	assert.True(t, proc.PPid() > 0)
+}
+
+func TestProcessesOpenBSD(t *testing.T) {
+	testProcesses(t, "go")
+}
+
+/*
+// Currently querying for -1 will return -1 :P
+
+func TestProcessesOpenBSDError(t *testing.T) {
+	proc, err := findProcess(-1)
+	assert.Nil(t, proc)
+	assert.Nil(t, err)
+}
+*/