aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/golang.org/x/sys/unix/syscall_darwin.go
blob: 59542a897d236606075760f33aa41563d692280b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
// Copyright 2009,2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Darwin system calls.
// This file is compiled as ordinary Go code,
// but it is also input to mksyscall,
// which parses the //sys lines and generates system call stubs.
// Note that sometimes we use a lowercase //sys name and wrap
// it in our own nicer implementation, either here or in
// syscall_bsd.go or syscall_unix.go.

package unix

import (
	"fmt"
	"syscall"
	"unsafe"
)

//sys	closedir(dir uintptr) (err error)
//sys	readdir_r(dir uintptr, entry *Dirent, result **Dirent) (res Errno)

func fdopendir(fd int) (dir uintptr, err error) {
	r0, _, e1 := syscall_syscallPtr(libc_fdopendir_trampoline_addr, uintptr(fd), 0, 0)
	dir = uintptr(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

var libc_fdopendir_trampoline_addr uintptr

//go:cgo_import_dynamic libc_fdopendir fdopendir "/usr/lib/libSystem.B.dylib"

func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
	// Simulate Getdirentries using fdopendir/readdir_r/closedir.
	// We store the number of entries to skip in the seek
	// offset of fd. See issue #31368.
	// It's not the full required semantics, but should handle the case
	// of calling Getdirentries or ReadDirent repeatedly.
	// It won't handle assigning the results of lseek to *basep, or handle
	// the directory being edited underfoot.
	skip, err := Seek(fd, 0, 1 /* SEEK_CUR */)
	if err != nil {
		return 0, err
	}

	// We need to duplicate the incoming file descriptor
	// because the caller expects to retain control of it, but
	// fdopendir expects to take control of its argument.
	// Just Dup'ing the file descriptor is not enough, as the
	// result shares underlying state. Use Openat to make a really
	// new file descriptor referring to the same directory.
	fd2, err := Openat(fd, ".", O_RDONLY, 0)
	if err != nil {
		return 0, err
	}
	d, err := fdopendir(fd2)
	if err != nil {
		Close(fd2)
		return 0, err
	}
	defer closedir(d)

	var cnt int64
	for {
		var entry Dirent
		var entryp *Dirent
		e := readdir_r(d, &entry, &entryp)
		if e != 0 {
			return n, errnoErr(e)
		}
		if entryp == nil {
			break
		}
		if skip > 0 {
			skip--
			cnt++
			continue
		}

		reclen := int(entry.Reclen)
		if reclen > len(buf) {
			// Not enough room. Return for now.
			// The counter will let us know where we should start up again.
			// Note: this strategy for suspending in the middle and
			// restarting is O(n^2) in the length of the directory. Oh well.
			break
		}

		// Copy entry into return buffer.
		s := unsafe.Slice((*byte)(unsafe.Pointer(&entry)), reclen)
		copy(buf, s)

		buf = buf[reclen:]
		n += reclen
		cnt++
	}
	// Set the seek offset of the input fd to record
	// how many files we've already returned.
	_, err = Seek(fd, cnt, 0 /* SEEK_SET */)
	if err != nil {
		return n, err
	}

	return n, nil
}

// SockaddrDatalink implements the Sockaddr interface for AF_LINK type sockets.
type SockaddrDatalink struct {
	Len    uint8
	Family uint8
	Index  uint16
	Type   uint8
	Nlen   uint8
	Alen   uint8
	Slen   uint8
	Data   [12]int8
	raw    RawSockaddrDatalink
}

// SockaddrCtl implements the Sockaddr interface for AF_SYSTEM type sockets.
type SockaddrCtl struct {
	ID   uint32
	Unit uint32
	raw  RawSockaddrCtl
}

func (sa *SockaddrCtl) sockaddr() (unsafe.Pointer, _Socklen, error) {
	sa.raw.Sc_len = SizeofSockaddrCtl
	sa.raw.Sc_family = AF_SYSTEM
	sa.raw.Ss_sysaddr = AF_SYS_CONTROL
	sa.raw.Sc_id = sa.ID
	sa.raw.Sc_unit = sa.Unit
	return unsafe.Pointer(&sa.raw), SizeofSockaddrCtl, nil
}

// SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets.
// SockaddrVM provides access to Darwin VM sockets: a mechanism that enables
// bidirectional communication between a hypervisor and its guest virtual
// machines.
type SockaddrVM struct {
	// CID and Port specify a context ID and port address for a VM socket.
	// Guests have a unique CID, and hosts may have a well-known CID of:
	//  - VMADDR_CID_HYPERVISOR: refers to the hypervisor process.
	//  - VMADDR_CID_LOCAL: refers to local communication (loopback).
	//  - VMADDR_CID_HOST: refers to other processes on the host.
	CID  uint32
	Port uint32
	raw  RawSockaddrVM
}

func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) {
	sa.raw.Len = SizeofSockaddrVM
	sa.raw.Family = AF_VSOCK
	sa.raw.Port = sa.Port
	sa.raw.Cid = sa.CID

	return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil
}

func anyToSockaddrGOOS(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
	switch rsa.Addr.Family {
	case AF_SYSTEM:
		pp := (*RawSockaddrCtl)(unsafe.Pointer(rsa))
		if pp.Ss_sysaddr == AF_SYS_CONTROL {
			sa := new(SockaddrCtl)
			sa.ID = pp.Sc_id
			sa.Unit = pp.Sc_unit
			return sa, nil
		}
	case AF_VSOCK:
		pp := (*RawSockaddrVM)(unsafe.Pointer(rsa))
		sa := &SockaddrVM{
			CID:  pp.Cid,
			Port: pp.Port,
		}
		return sa, nil
	}
	return nil, EAFNOSUPPORT
}

// Some external packages rely on SYS___SYSCTL being defined to implement their
// own sysctl wrappers. Provide it here, even though direct syscalls are no
// longer supported on darwin.
const SYS___SYSCTL = SYS_SYSCTL

// Translate "kern.hostname" to []_C_int{0,1,2,3}.
func nametomib(name string) (mib []_C_int, err error) {
	const siz = unsafe.Sizeof(mib[0])

	// NOTE(rsc): It seems strange to set the buffer to have
	// size CTL_MAXNAME+2 but use only CTL_MAXNAME
	// as the size. I don't know why the +2 is here, but the
	// kernel uses +2 for its own implementation of this function.
	// I am scared that if we don't include the +2 here, the kernel
	// will silently write 2 words farther than we specify
	// and we'll get memory corruption.
	var buf [CTL_MAXNAME + 2]_C_int
	n := uintptr(CTL_MAXNAME) * siz

	p := (*byte)(unsafe.Pointer(&buf[0]))
	bytes, err := ByteSliceFromString(name)
	if err != nil {
		return nil, err
	}

	// Magic sysctl: "setting" 0.3 to a string name
	// lets you read back the array of integers form.
	if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil {
		return nil, err
	}
	return buf[0 : n/siz], nil
}

func direntIno(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino))
}

func direntReclen(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
}

func direntNamlen(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))
}

func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) }
func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) }
func PtraceDenyAttach() (err error)    { return ptrace(PT_DENY_ATTACH, 0, 0, 0) }

//sysnb	pipe(p *[2]int32) (err error)

func Pipe(p []int) (err error) {
	if len(p) != 2 {
		return EINVAL
	}
	var x [2]int32
	err = pipe(&x)
	if err == nil {
		p[0] = int(x[0])
		p[1] = int(x[1])
	}
	return
}

func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
	var _p0 unsafe.Pointer
	var bufsize uintptr
	if len(buf) > 0 {
		_p0 = unsafe.Pointer(&buf[0])
		bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf))
	}
	return getfsstat(_p0, bufsize, flags)
}

func xattrPointer(dest []byte) *byte {
	// It's only when dest is set to NULL that the OS X implementations of
	// getxattr() and listxattr() return the current sizes of the named attributes.
	// An empty byte array is not sufficient. To maintain the same behaviour as the
	// linux implementation, we wrap around the system calls and pass in NULL when
	// dest is empty.
	var destp *byte
	if len(dest) > 0 {
		destp = &dest[0]
	}
	return destp
}

//sys	getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error)

func Getxattr(path string, attr string, dest []byte) (sz int, err error) {
	return getxattr(path, attr, xattrPointer(dest), len(dest), 0, 0)
}

func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) {
	return getxattr(link, attr, xattrPointer(dest), len(dest), 0, XATTR_NOFOLLOW)
}

//sys	fgetxattr(fd int, attr string, dest *byte, size int, position uint32, options int) (sz int, err error)

func Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) {
	return fgetxattr(fd, attr, xattrPointer(dest), len(dest), 0, 0)
}

//sys	setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error)

func Setxattr(path string, attr string, data []byte, flags int) (err error) {
	// The parameters for the OS X implementation vary slightly compared to the
	// linux system call, specifically the position parameter:
	//
	//  linux:
	//      int setxattr(
	//          const char *path,
	//          const char *name,
	//          const void *value,
	//          size_t size,
	//          int flags
	//      );
	//
	//  darwin:
	//      int setxattr(
	//          const char *path,
	//          const char *name,
	//          void *value,
	//          size_t size,
	//          u_int32_t position,
	//          int options
	//      );
	//
	// position specifies the offset within the extended attribute. In the
	// current implementation, only the resource fork extended attribute makes
	// use of this argument. For all others, position is reserved. We simply
	// default to setting it to zero.
	return setxattr(path, attr, xattrPointer(data), len(data), 0, flags)
}

func Lsetxattr(link string, attr string, data []byte, flags int) (err error) {
	return setxattr(link, attr, xattrPointer(data), len(data), 0, flags|XATTR_NOFOLLOW)
}

//sys	fsetxattr(fd int, attr string, data *byte, size int, position uint32, options int) (err error)

func Fsetxattr(fd int, attr string, data []byte, flags int) (err error) {
	return fsetxattr(fd, attr, xattrPointer(data), len(data), 0, 0)
}

//sys	removexattr(path string, attr string, options int) (err error)

func Removexattr(path string, attr string) (err error) {
	// We wrap around and explicitly zero out the options provided to the OS X
	// implementation of removexattr, we do so for interoperability with the
	// linux variant.
	return removexattr(path, attr, 0)
}

func Lremovexattr(link string, attr string) (err error) {
	return removexattr(link, attr, XATTR_NOFOLLOW)
}

//sys	fremovexattr(fd int, attr string, options int) (err error)

func Fremovexattr(fd int, attr string) (err error) {
	return fremovexattr(fd, attr, 0)
}

//sys	listxattr(path string, dest *byte, size int, options int) (sz int, err error)

func Listxattr(path string, dest []byte) (sz int, err error) {
	return listxattr(path, xattrPointer(dest), len(dest), 0)
}

func Llistxattr(link string, dest []byte) (sz int, err error) {
	return listxattr(link, xattrPointer(dest), len(dest), XATTR_NOFOLLOW)
}

//sys	flistxattr(fd int, dest *byte, size int, options int) (sz int, err error)

func Flistxattr(fd int, dest []byte) (sz int, err error) {
	return flistxattr(fd, xattrPointer(dest), len(dest), 0)
}

//sys	utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)

/*
 * Wrapped
 */

//sys	fcntl(fd int, cmd int, arg int) (val int, err error)

//sys	kill(pid int, signum int, posix int) (err error)

func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(signum), 1) }

//sys	ioctl(fd int, req uint, arg uintptr) (err error)
//sys	ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_IOCTL

func IoctlCtlInfo(fd int, ctlInfo *CtlInfo) error {
	return ioctlPtr(fd, CTLIOCGINFO, unsafe.Pointer(ctlInfo))
}

// IfreqMTU is struct ifreq used to get or set a network device's MTU.
type IfreqMTU struct {
	Name [IFNAMSIZ]byte
	MTU  int32
}

// IoctlGetIfreqMTU performs the SIOCGIFMTU ioctl operation on fd to get the MTU
// of the network device specified by ifname.
func IoctlGetIfreqMTU(fd int, ifname string) (*IfreqMTU, error) {
	var ifreq IfreqMTU
	copy(ifreq.Name[:], ifname)
	err := ioctlPtr(fd, SIOCGIFMTU, unsafe.Pointer(&ifreq))
	return &ifreq, err
}

// IoctlSetIfreqMTU performs the SIOCSIFMTU ioctl operation on fd to set the MTU
// of the network device specified by ifreq.Name.
func IoctlSetIfreqMTU(fd int, ifreq *IfreqMTU) error {
	return ioctlPtr(fd, SIOCSIFMTU, unsafe.Pointer(ifreq))
}

//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS_SYSCTL

func Uname(uname *Utsname) error {
	mib := []_C_int{CTL_KERN, KERN_OSTYPE}
	n := unsafe.Sizeof(uname.Sysname)
	if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_HOSTNAME}
	n = unsafe.Sizeof(uname.Nodename)
	if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_OSRELEASE}
	n = unsafe.Sizeof(uname.Release)
	if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_VERSION}
	n = unsafe.Sizeof(uname.Version)
	if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil {
		return err
	}

	// The version might have newlines or tabs in it, convert them to
	// spaces.
	for i, b := range uname.Version {
		if b == '\n' || b == '\t' {
			if i == len(uname.Version)-1 {
				uname.Version[i] = 0
			} else {
				uname.Version[i] = ' '
			}
		}
	}

	mib = []_C_int{CTL_HW, HW_MACHINE}
	n = unsafe.Sizeof(uname.Machine)
	if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil {
		return err
	}

	return nil
}

func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}
	var length = int64(count)
	err = sendfile(infd, outfd, *offset, &length, nil, 0)
	written = int(length)
	return
}

func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
	var value IPMreqn
	vallen := _Socklen(SizeofIPMreqn)
	errno := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
	return &value, errno
}

func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
}

// GetsockoptXucred is a getsockopt wrapper that returns an Xucred struct.
// The usual level and opt are SOL_LOCAL and LOCAL_PEERCRED, respectively.
func GetsockoptXucred(fd, level, opt int) (*Xucred, error) {
	x := new(Xucred)
	vallen := _Socklen(SizeofXucred)
	err := getsockopt(fd, level, opt, unsafe.Pointer(x), &vallen)
	return x, err
}

func GetsockoptTCPConnectionInfo(fd, level, opt int) (*TCPConnectionInfo, error) {
	var value TCPConnectionInfo
	vallen := _Socklen(SizeofTCPConnectionInfo)
	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
	return &value, err
}

func SysctlKinfoProc(name string, args ...int) (*KinfoProc, error) {
	mib, err := sysctlmib(name, args...)
	if err != nil {
		return nil, err
	}

	var kinfo KinfoProc
	n := uintptr(SizeofKinfoProc)
	if err := sysctl(mib, (*byte)(unsafe.Pointer(&kinfo)), &n, nil, 0); err != nil {
		return nil, err
	}
	if n != SizeofKinfoProc {
		return nil, EIO
	}
	return &kinfo, nil
}

func SysctlKinfoProcSlice(name string, args ...int) ([]KinfoProc, error) {
	mib, err := sysctlmib(name, args...)
	if err != nil {
		return nil, err
	}

	for {
		// Find size.
		n := uintptr(0)
		if err := sysctl(mib, nil, &n, nil, 0); err != nil {
			return nil, err
		}
		if n == 0 {
			return nil, nil
		}
		if n%SizeofKinfoProc != 0 {
			return nil, fmt.Errorf("sysctl() returned a size of %d, which is not a multiple of %d", n, SizeofKinfoProc)
		}

		// Read into buffer of that size.
		buf := make([]KinfoProc, n/SizeofKinfoProc)
		if err := sysctl(mib, (*byte)(unsafe.Pointer(&buf[0])), &n, nil, 0); err != nil {
			if err == ENOMEM {
				// Process table grew. Try again.
				continue
			}
			return nil, err
		}
		if n%SizeofKinfoProc != 0 {
			return nil, fmt.Errorf("sysctl() returned a size of %d, which is not a multiple of %d", n, SizeofKinfoProc)
		}

		// The actual call may return less than the original reported required
		// size so ensure we deal with that.
		return buf[:n/SizeofKinfoProc], nil
	}
}

//sys	sendfile(infd int, outfd int, offset int64, len *int64, hdtr unsafe.Pointer, flags int) (err error)

//sys	shmat(id int, addr uintptr, flag int) (ret uintptr, err error)
//sys	shmctl(id int, cmd int, buf *SysvShmDesc) (result int, err error)
//sys	shmdt(addr uintptr) (err error)
//sys	shmget(key int, size int, flag int) (id int, err error)

/*
 * Exposed directly
 */
//sys	Access(path string, mode uint32) (err error)
//sys	Adjtime(delta *Timeval, olddelta *Timeval) (err error)
//sys	Chdir(path string) (err error)
//sys	Chflags(path string, flags int) (err error)
//sys	Chmod(path string, mode uint32) (err error)
//sys	Chown(path string, uid int, gid int) (err error)
//sys	Chroot(path string) (err error)
//sys	ClockGettime(clockid int32, time *Timespec) (err error)
//sys	Close(fd int) (err error)
//sys	Clonefile(src string, dst string, flags int) (err error)
//sys	Clonefileat(srcDirfd int, src string, dstDirfd int, dst string, flags int) (err error)
//sys	Dup(fd int) (nfd int, err error)
//sys	Dup2(from int, to int) (err error)
//sys	Exchangedata(path1 string, path2 string, options int) (err error)
//sys	Exit(code int)
//sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
//sys	Fchdir(fd int) (err error)
//sys	Fchflags(fd int, flags int) (err error)
//sys	Fchmod(fd int, mode uint32) (err error)
//sys	Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
//sys	Fclonefileat(srcDirfd int, dstDirfd int, dst string, flags int) (err error)
//sys	Flock(fd int, how int) (err error)
//sys	Fpathconf(fd int, name int) (val int, err error)
//sys	Fsync(fd int) (err error)
//sys	Ftruncate(fd int, length int64) (err error)
//sys	Getcwd(buf []byte) (n int, err error)
//sys	Getdtablesize() (size int)
//sysnb	Getegid() (egid int)
//sysnb	Geteuid() (uid int)
//sysnb	Getgid() (gid int)
//sysnb	Getpgid(pid int) (pgid int, err error)
//sysnb	Getpgrp() (pgrp int)
//sysnb	Getpid() (pid int)
//sysnb	Getppid() (ppid int)
//sys	Getpriority(which int, who int) (prio int, err error)
//sysnb	Getrlimit(which int, lim *Rlimit) (err error)
//sysnb	Getrusage(who int, rusage *Rusage) (err error)
//sysnb	Getsid(pid int) (sid int, err error)
//sysnb	Gettimeofday(tp *Timeval) (err error)
//sysnb	Getuid() (uid int)
//sysnb	Issetugid() (tainted bool)
//sys	Kqueue() (fd int, err error)
//sys	Lchown(path string, uid int, gid int) (err error)
//sys	Link(path string, link string) (err error)
//sys	Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error)
//sys	Listen(s int, backlog int) (err error)
//sys	Mkdir(path string, mode uint32) (err error)
//sys	Mkdirat(dirfd int, path string, mode uint32) (err error)
//sys	Mkfifo(path string, mode uint32) (err error)
//sys	Mknod(path string, mode uint32, dev int) (err error)
//sys	Mount(fsType string, dir string, flags int, data unsafe.Pointer) (err error)
//sys	Open(path string, mode int, perm uint32) (fd int, err error)
//sys	Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error)
//sys	Pathconf(path string, name int) (val int, err error)
//sys	pread(fd int, p []byte, offset int64) (n int, err error)
//sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
//sys	read(fd int, p []byte) (n int, err error)
//sys	Readlink(path string, buf []byte) (n int, err error)
//sys	Readlinkat(dirfd int, path string, buf []byte) (n int, err error)
//sys	Rename(from string, to string) (err error)
//sys	Renameat(fromfd int, from string, tofd int, to string) (err error)
//sys	Revoke(path string) (err error)
//sys	Rmdir(path string) (err error)
//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK
//sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
//sys	Setattrlist(path string, attrlist *Attrlist, attrBuf []byte, options int) (err error)
//sys	Setegid(egid int) (err error)
//sysnb	Seteuid(euid int) (err error)
//sysnb	Setgid(gid int) (err error)
//sys	Setlogin(name string) (err error)
//sysnb	Setpgid(pid int, pgid int) (err error)
//sys	Setpriority(which int, who int, prio int) (err error)
//sys	Setprivexec(flag int) (err error)
//sysnb	Setregid(rgid int, egid int) (err error)
//sysnb	Setreuid(ruid int, euid int) (err error)
//sysnb	Setsid() (pid int, err error)
//sysnb	Settimeofday(tp *Timeval) (err error)
//sysnb	Setuid(uid int) (err error)
//sys	Symlink(path string, link string) (err error)
//sys	Symlinkat(oldpath string, newdirfd int, newpath string) (err error)
//sys	Sync() (err error)
//sys	Truncate(path string, length int64) (err error)
//sys	Umask(newmask int) (oldmask int)
//sys	Undelete(path string) (err error)
//sys	Unlink(path string) (err error)
//sys	Unlinkat(dirfd int, path string, flags int) (err error)
//sys	Unmount(path string, flags int) (err error)
//sys	write(fd int, p []byte) (n int, err error)
//sys	mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
//sys	munmap(addr uintptr, length uintptr) (err error)