gtsocial-umbx

libc_unix.go (22091B)

---

 // Copyright 2020 The Libc Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 //go:build linux || darwin || freebsd || netbsd || openbsd
 // +build linux darwin freebsd netbsd openbsd
 
 package libc // import "modernc.org/libc"
 
 import (
 	"bufio"
 	"io/ioutil"
 	"math"
 	"math/rand"
 	"os"
 	gosignal "os/signal"
 	"reflect"
 	"strconv"
 	"strings"
 	"sync"
 	"syscall"
 	"time"
 	"unsafe"
 
 	guuid "github.com/google/uuid"
 	"golang.org/x/sys/unix"
 	"modernc.org/libc/errno"
 	"modernc.org/libc/grp"
 	"modernc.org/libc/poll"
 	"modernc.org/libc/pwd"
 	"modernc.org/libc/signal"
 	"modernc.org/libc/stdio"
 	"modernc.org/libc/stdlib"
 	"modernc.org/libc/sys/types"
 	ctime "modernc.org/libc/time"
 )
 
 var staticGetpwnam pwd.Passwd
 
 func init() {
 	atExit = append(atExit, func() { closePasswd(&staticGetpwnam) })
 }
 
 // sighandler_t signal(int signum, sighandler_t handler);
 func Xsignal(t *TLS, signum int32, handler uintptr) uintptr { //TODO use sigaction?
 	signalsMu.Lock()
 
 	defer signalsMu.Unlock()
 
 	r := signals[signum]
 	signals[signum] = handler
 	switch handler {
 	case signal.SIG_DFL:
 		panic(todo("%v %#x", syscall.Signal(signum), handler))
 	case signal.SIG_IGN:
 		switch r {
 		case signal.SIG_DFL:
 			gosignal.Ignore(syscall.Signal(signum)) //TODO
 		case signal.SIG_IGN:
 			gosignal.Ignore(syscall.Signal(signum))
 		default:
 			panic(todo("%v %#x", syscall.Signal(signum), handler))
 		}
 	default:
 		switch r {
 		case signal.SIG_DFL:
 			c := make(chan os.Signal, 1)
 			gosignal.Notify(c, syscall.Signal(signum))
 			go func() { //TODO mechanism to stop/cancel
 				for {
 					<-c
 					var f func(*TLS, int32)
 					*(*uintptr)(unsafe.Pointer(&f)) = handler
 					tls := NewTLS()
 					f(tls, signum)
 					tls.Close()
 				}
 			}()
 		case signal.SIG_IGN:
 			panic(todo("%v %#x", syscall.Signal(signum), handler))
 		default:
 			panic(todo("%v %#x", syscall.Signal(signum), handler))
 		}
 	}
 	return r
 }
 
 // void rewind(FILE *stream);
 func Xrewind(t *TLS, stream uintptr) {
 	Xfseek(t, stream, 0, stdio.SEEK_SET)
 }
 
 // int putchar(int c);
 func Xputchar(t *TLS, c int32) int32 {
 	if _, err := write([]byte{byte(c)}); err != nil {
 		return stdio.EOF
 	}
 
 	return int32(c)
 }
 
 // int gethostname(char *name, size_t len);
 func Xgethostname(t *TLS, name uintptr, slen types.Size_t) int32 {
 	if slen < 0 {
 		t.setErrno(errno.EINVAL)
 		return -1
 	}
 
 	if slen == 0 {
 		return 0
 	}
 
 	s, err := os.Hostname()
 	if err != nil {
 		panic(todo(""))
 	}
 
 	n := len(s)
 	if len(s) >= int(slen) {
 		n = int(slen) - 1
 	}
 	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
 	copy((*RawMem)(unsafe.Pointer(name))[:n:n], (*RawMem)(unsafe.Pointer(sh.Data))[:n:n])
 	*(*byte)(unsafe.Pointer(name + uintptr(n))) = 0
 	return 0
 }
 
 // int remove(const char *pathname);
 func Xremove(t *TLS, pathname uintptr) int32 {
 	panic(todo(""))
 }
 
 // long pathconf(const char *path, int name);
 func Xpathconf(t *TLS, path uintptr, name int32) long {
 	panic(todo(""))
 }
 
 // ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen);
 func Xrecvfrom(t *TLS, sockfd int32, buf uintptr, len types.Size_t, flags int32, src_addr, addrlen uintptr) types.Ssize_t {
 	panic(todo(""))
 }
 
 // ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen);
 func Xsendto(t *TLS, sockfd int32, buf uintptr, len types.Size_t, flags int32, src_addr uintptr, addrlen socklen_t) types.Ssize_t {
 	panic(todo(""))
 }
 
 // void srand48(long int seedval);
 func Xsrand48(t *TLS, seedval long) {
 	panic(todo(""))
 }
 
 // long int lrand48(void);
 func Xlrand48(t *TLS) long {
 	panic(todo(""))
 }
 
 // ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags);
 func Xsendmsg(t *TLS, sockfd int32, msg uintptr, flags int32) types.Ssize_t {
 	panic(todo(""))
 }
 
 // int poll(struct pollfd *fds, nfds_t nfds, int timeout);
 func Xpoll(t *TLS, fds uintptr, nfds poll.Nfds_t, timeout int32) int32 {
 	if nfds == 0 {
 		panic(todo(""))
 	}
 
 	// if dmesgs {
 	// 	dmesg("%v: %#x %v %v, %+v", origin(1), fds, nfds, timeout, (*[1000]unix.PollFd)(unsafe.Pointer(fds))[:nfds:nfds])
 	// }
 	n, err := unix.Poll((*[1000]unix.PollFd)(unsafe.Pointer(fds))[:nfds:nfds], int(timeout))
 	// if dmesgs {
 	// 	dmesg("%v: %v %v", origin(1), n, err)
 	// }
 	if err != nil {
 		t.setErrno(err)
 		return -1
 	}
 
 	return int32(n)
 }
 
 // ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags);
 func Xrecvmsg(t *TLS, sockfd int32, msg uintptr, flags int32) types.Ssize_t {
 	n, _, err := unix.Syscall(unix.SYS_RECVMSG, uintptr(sockfd), msg, uintptr(flags))
 	if err != 0 {
 		t.setErrno(err)
 		return -1
 	}
 
 	return types.Ssize_t(n)
 }
 
 // struct cmsghdr *CMSG_NXTHDR(struct msghdr *msgh, struct cmsghdr *cmsg);
 func X__cmsg_nxthdr(t *TLS, msgh, cmsg uintptr) uintptr {
 	panic(todo(""))
 }
 
 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
 func Xwcschr(t *TLS, wcs uintptr, wc wchar_t) wchar_t {
 	panic(todo(""))
 }
 
 // gid_t getegid(void);
 func Xgetegid(t *TLS) types.Gid_t {
 	panic(todo(""))
 }
 
 // gid_t getgid(void);
 func Xgetgid(t *TLS) types.Gid_t {
 	panic(todo(""))
 }
 
 // void *shmat(int shmid, const void *shmaddr, int shmflg);
 func Xshmat(t *TLS, shmid int32, shmaddr uintptr, shmflg int32) uintptr {
 	panic(todo(""))
 }
 
 // int shmctl(int shmid, int cmd, struct shmid_ds *buf);
 func Xshmctl(t *TLS, shmid, cmd int32, buf uintptr) int32 {
 	panic(todo(""))
 }
 
 // int shmdt(const void *shmaddr);
 func Xshmdt(t *TLS, shmaddr uintptr) int32 {
 	panic(todo(""))
 }
 
 // int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
 func Xgetresuid(t *TLS, ruid, euid, suid uintptr) int32 {
 	panic(todo(""))
 }
 
 // int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
 func Xgetresgid(t *TLS, rgid, egid, sgid uintptr) int32 {
 	panic(todo(""))
 }
 
 // FILE *tmpfile(void);
 func Xtmpfile(t *TLS) uintptr {
 	f, err := ioutil.TempFile("", "tmpfile-")
 	if err != nil {
 		t.setErrno(err)
 		return 0
 	}
 
 	cf := newFile(t, int32(f.Fd()))
 	AtExit(func() {
 		nm := f.Name()
 		file(cf).close(t)
 		os.Remove(nm)
 	})
 
 	return cf
 }
 
 // FILE *fdopen(int fd, const char *mode);
 func Xfdopen(t *TLS, fd int32, mode uintptr) uintptr {
 	m := strings.ReplaceAll(GoString(mode), "b", "")
 	switch m {
 	case
 		"a",
 		"a+",
 		"r",
 		"r+",
 		"w",
 		"w+":
 	default:
 		t.setErrno(errno.EINVAL)
 		return 0
 	}
 
 	if p := newFile(t, fd); p != 0 {
 		return p
 	}
 
 	t.setErrno(errno.EINVAL)
 	return 0
 }
 
 // struct passwd *getpwnam(const char *name);
 func Xgetpwnam(t *TLS, name uintptr) uintptr {
 	f, err := os.Open("/etc/passwd")
 	if err != nil {
 		panic(todo("", err))
 	}
 
 	defer f.Close()
 
 	sname := GoString(name)
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if s == "" || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:0:root:/root:/bin/bash"
 		a := strings.Split(s, ":")
 		if len(a) < 7 {
 			panic(todo(""))
 		}
 
 		if a[0] == sname {
 			uid, err := strconv.Atoi(a[2])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			gid, err := strconv.Atoi(a[3])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			closePasswd(&staticGetpwnam)
 			gecos := a[4]
 			if strings.Contains(gecos, ",") {
 				a := strings.Split(gecos, ",")
 				gecos = a[0]
 			}
 			initPasswd(t, &staticGetpwnam, a[0], a[1], uint32(uid), uint32(gid), gecos, a[5], a[6])
 			return uintptr(unsafe.Pointer(&staticGetpwnam))
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	return 0
 }
 
 // int getpwnam_r(char *name, struct passwd *pwd, char *buf, size_t buflen, struct passwd **result);
 func Xgetpwnam_r(t *TLS, name, cpwd, buf uintptr, buflen types.Size_t, result uintptr) int32 {
 	f, err := os.Open("/etc/passwd")
 	if err != nil {
 		panic(todo("", err))
 	}
 
 	defer f.Close()
 
 	sname := GoString(name)
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if s == "" || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:0:root:/root:/bin/bash"
 		a := strings.Split(s, ":")
 		if len(a) < 7 {
 			panic(todo("%q", s))
 		}
 
 		if a[0] == sname {
 			uid, err := strconv.Atoi(a[2])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			gid, err := strconv.Atoi(a[3])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			gecos := a[4]
 			if strings.Contains(gecos, ",") {
 				a := strings.Split(gecos, ",")
 				gecos = a[0]
 			}
 			var v pwd.Passwd
 			if initPasswd2(t, buf, buflen, &v, a[0], a[1], uint32(uid), uint32(gid), gecos, a[5], a[6]) {
 				*(*pwd.Passwd)(unsafe.Pointer(cpwd)) = v
 				*(*uintptr)(unsafe.Pointer(result)) = cpwd
 				return 0
 			}
 
 			*(*uintptr)(unsafe.Pointer(result)) = 0
 			return errno.ERANGE
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	*(*uintptr)(unsafe.Pointer(result)) = 0
 	return 0
 }
 
 func init() {
 	atExit = append(atExit, func() { closeGroup(&staticGetgrgid) })
 }
 
 var staticGetgrgid grp.Group
 
 // struct group *getgrgid(gid_t gid);
 func Xgetgrgid(t *TLS, gid uint32) uintptr {
 	f, err := os.Open("/etc/group")
 	if err != nil {
 		panic(todo(""))
 	}
 
 	defer f.Close()
 
 	sid := strconv.Itoa(int(gid))
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if s == "" || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:"
 		a := strings.Split(s, ":")
 		if len(a) < 4 {
 			panic(todo("%q", s))
 		}
 
 		if a[2] == sid {
 			closeGroup(&staticGetgrgid)
 			var names []string
 			if a[3] != "" {
 				names = strings.Split(a[3], ",")
 			}
 			initGroup(t, &staticGetgrgid, a[0], a[1], gid, names)
 			return uintptr(unsafe.Pointer(&staticGetgrgid))
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	return 0
 }
 
 // int getgrgid_r(gid_t gid, struct group *grp, char *buf, size_t buflen, struct group **result);
 func Xgetgrgid_r(t *TLS, gid uint32, pGrp, buf uintptr, buflen types.Size_t, result uintptr) int32 {
 	f, err := os.Open("/etc/group")
 	if err != nil {
 		panic(todo(""))
 	}
 
 	defer f.Close()
 
 	sid := strconv.Itoa(int(gid))
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if s == "" || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:"
 		a := strings.Split(s, ":")
 		if len(a) < 4 {
 			panic(todo("%q", s))
 		}
 
 		if a[2] == sid {
 			var names []string
 			if a[3] != "" {
 				names = strings.Split(a[3], ",")
 			}
 			var x grp.Group
 			if initGroup2(buf, buflen, &x, a[0], a[1], gid, names) {
 				*(*grp.Group)(unsafe.Pointer(pGrp)) = x
 				*(*uintptr)(unsafe.Pointer(result)) = pGrp
 				return 0
 			}
 
 			*(*uintptr)(unsafe.Pointer(result)) = 0
 			return 0
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	*(*uintptr)(unsafe.Pointer(result)) = 0
 	return 0
 }
 
 func initPasswd2(t *TLS, buf uintptr, buflen types.Size_t, p *pwd.Passwd, name, pwd string, uid, gid uint32, gecos, dir, shell string) bool {
 	p.Fpw_name, buf, buflen = bufString(buf, buflen, name)
 	if buf == 0 {
 		return false
 	}
 
 	p.Fpw_passwd, buf, buflen = bufString(buf, buflen, pwd)
 	if buf == 0 {
 		return false
 	}
 
 	p.Fpw_uid = uid
 	p.Fpw_gid = gid
 	if buf == 0 {
 		return false
 	}
 
 	p.Fpw_gecos, buf, buflen = bufString(buf, buflen, gecos)
 	if buf == 0 {
 		return false
 	}
 
 	p.Fpw_dir, buf, buflen = bufString(buf, buflen, dir)
 	if buf == 0 {
 		return false
 	}
 
 	p.Fpw_shell, buf, buflen = bufString(buf, buflen, shell)
 	if buf == 0 {
 		return false
 	}
 
 	return true
 }
 
 func bufString(buf uintptr, buflen types.Size_t, s string) (uintptr, uintptr, types.Size_t) {
 	buf0 := buf
 	rq := len(s) + 1
 	if rq > int(buflen) {
 		return 0, 0, 0
 	}
 
 	copy((*RawMem)(unsafe.Pointer(buf))[:len(s):len(s)], s)
 	buf += uintptr(len(s))
 	*(*byte)(unsafe.Pointer(buf)) = 0
 	return buf0, buf + 1, buflen - types.Size_t(rq)
 }
 
 func closeGroup(p *grp.Group) {
 	Xfree(nil, p.Fgr_name)
 	Xfree(nil, p.Fgr_passwd)
 	if p := p.Fgr_mem; p != 0 {
 		for {
 			q := *(*uintptr)(unsafe.Pointer(p))
 			if q == 0 {
 				break
 			}
 
 			Xfree(nil, q)
 			p += unsafe.Sizeof(uintptr(0))
 		}
 	}
 	*p = grp.Group{}
 }
 
 func initGroup(t *TLS, p *grp.Group, name, pwd string, gid uint32, names []string) {
 	p.Fgr_name = cString(t, name)
 	p.Fgr_passwd = cString(t, pwd)
 	p.Fgr_gid = gid
 	a := Xcalloc(t, 1, types.Size_t(unsafe.Sizeof(uintptr(0)))*types.Size_t((len(names)+1)))
 	if a == 0 {
 		panic("OOM")
 	}
 
 	for p := a; len(names) != 0; p += unsafe.Sizeof(uintptr(0)) {
 		*(*uintptr)(unsafe.Pointer(p)) = cString(t, names[0])
 		names = names[1:]
 	}
 	p.Fgr_mem = a
 }
 
 func initGroup2(buf uintptr, buflen types.Size_t, p *grp.Group, name, pwd string, gid uint32, names []string) bool {
 	p.Fgr_name, buf, buflen = bufString(buf, buflen, name)
 	if buf == 0 {
 		return false
 	}
 
 	p.Fgr_passwd, buf, buflen = bufString(buf, buflen, pwd)
 	if buf == 0 {
 		return false
 	}
 
 	p.Fgr_gid = gid
 	rq := unsafe.Sizeof(uintptr(0)) * uintptr(len(names)+1)
 	if rq > uintptr(buflen) {
 		return false
 	}
 
 	a := buf
 	buf += rq
 	for ; len(names) != 0; buf += unsafe.Sizeof(uintptr(0)) {
 		if len(names[0])+1 > int(buflen) {
 			return false
 		}
 
 		*(*uintptr)(unsafe.Pointer(buf)), buf, buflen = bufString(buf, buflen, names[0])
 		names = names[1:]
 	}
 	*(*uintptr)(unsafe.Pointer(buf)) = 0
 	p.Fgr_mem = a
 	return true
 }
 
 func init() {
 	atExit = append(atExit, func() { closeGroup(&staticGetgrgid) })
 }
 
 var staticGetpwuid pwd.Passwd
 
 func init() {
 	atExit = append(atExit, func() { closePasswd(&staticGetpwuid) })
 }
 
 func closePasswd(p *pwd.Passwd) {
 	Xfree(nil, p.Fpw_name)
 	Xfree(nil, p.Fpw_passwd)
 	Xfree(nil, p.Fpw_gecos)
 	Xfree(nil, p.Fpw_dir)
 	Xfree(nil, p.Fpw_shell)
 	*p = pwd.Passwd{}
 }
 
 var staticGetgrnam grp.Group
 
 func init() {
 	atExit = append(atExit, func() { closeGroup(&staticGetgrnam) })
 }
 
 // struct passwd *getpwuid(uid_t uid);
 func Xgetpwuid(t *TLS, uid uint32) uintptr {
 	f, err := os.Open("/etc/passwd")
 	if err != nil {
 		panic(todo("", err))
 	}
 
 	defer f.Close()
 
 	sid := strconv.Itoa(int(uid))
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if len(s) == 0 || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:0:root:/root:/bin/bash"
 		a := strings.Split(s, ":")
 		if len(a) < 7 {
 			panic(todo("%q", s))
 		}
 
 		if a[2] == sid {
 			uid, err := strconv.Atoi(a[2])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			gid, err := strconv.Atoi(a[3])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			closePasswd(&staticGetpwuid)
 			gecos := a[4]
 			if strings.Contains(gecos, ",") {
 				a := strings.Split(gecos, ",")
 				gecos = a[0]
 			}
 			initPasswd(t, &staticGetpwuid, a[0], a[1], uint32(uid), uint32(gid), gecos, a[5], a[6])
 			return uintptr(unsafe.Pointer(&staticGetpwuid))
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	return 0
 }
 
 func initPasswd(t *TLS, p *pwd.Passwd, name, pwd string, uid, gid uint32, gecos, dir, shell string) {
 	p.Fpw_name = cString(t, name)
 	p.Fpw_passwd = cString(t, pwd)
 	p.Fpw_uid = uid
 	p.Fpw_gid = gid
 	p.Fpw_gecos = cString(t, gecos)
 	p.Fpw_dir = cString(t, dir)
 	p.Fpw_shell = cString(t, shell)
 }
 
 // struct group *getgrnam(const char *name);
 func Xgetgrnam(t *TLS, name uintptr) uintptr {
 	f, err := os.Open("/etc/group")
 	if err != nil {
 		panic(todo(""))
 	}
 
 	defer f.Close()
 
 	sname := GoString(name)
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if len(s) == 0 || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:"
 		a := strings.Split(s, ":")
 		if len(a) < 4 {
 			panic(todo("%q", s))
 		}
 
 		if a[0] == sname {
 			closeGroup(&staticGetgrnam)
 			gid, err := strconv.Atoi(a[2])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			var names []string
 			if a[3] != "" {
 				names = strings.Split(a[3], ",")
 			}
 			initGroup(t, &staticGetgrnam, a[0], a[1], uint32(gid), names)
 			return uintptr(unsafe.Pointer(&staticGetgrnam))
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	return 0
 }
 
 // int getgrnam_r(const char *name, struct group *grp, char *buf, size_t buflen, struct group **result);
 func Xgetgrnam_r(t *TLS, name, pGrp, buf uintptr, buflen types.Size_t, result uintptr) int32 {
 	f, err := os.Open("/etc/group")
 	if err != nil {
 		panic(todo(""))
 	}
 
 	defer f.Close()
 
 	sname := GoString(name)
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if len(s) == 0 || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:"
 		a := strings.Split(s, ":")
 		if len(a) < 4 {
 			panic(todo("%q", s))
 		}
 
 		if a[0] == sname {
 			gid, err := strconv.Atoi(a[2])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			var names []string
 			if a[3] != "" {
 				names = strings.Split(a[3], ",")
 			}
 			var x grp.Group
 			if initGroup2(buf, buflen, &x, a[0], a[1], uint32(gid), names) {
 				*(*grp.Group)(unsafe.Pointer(pGrp)) = x
 				*(*uintptr)(unsafe.Pointer(result)) = pGrp
 				return 0
 			}
 
 			*(*uintptr)(unsafe.Pointer(result)) = 0
 			return 0
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	*(*uintptr)(unsafe.Pointer(result)) = 0
 	return 0
 }
 
 // int getpwuid_r(uid_t uid, struct passwd *pwd, char *buf, size_t buflen, struct passwd **result);
 func Xgetpwuid_r(t *TLS, uid types.Uid_t, cpwd, buf uintptr, buflen types.Size_t, result uintptr) int32 {
 	f, err := os.Open("/etc/passwd")
 	if err != nil {
 		panic(todo("", err))
 	}
 
 	defer f.Close()
 
 	sid := strconv.Itoa(int(uid))
 	sc := bufio.NewScanner(f)
 	for sc.Scan() {
 		s := strings.TrimSpace(sc.Text())
 		if len(s) == 0 || strings.HasPrefix(s, "#") {
 			continue
 		}
 
 		// eg. "root:x:0:0:root:/root:/bin/bash"
 		a := strings.Split(s, ":")
 		if len(a) < 7 {
 			panic(todo("%q", s))
 		}
 
 		if a[2] == sid {
 			uid, err := strconv.Atoi(a[2])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			gid, err := strconv.Atoi(a[3])
 			if err != nil {
 				panic(todo(""))
 			}
 
 			gecos := a[4]
 			if strings.Contains(gecos, ",") {
 				a := strings.Split(gecos, ",")
 				gecos = a[0]
 			}
 			var v pwd.Passwd
 			if initPasswd2(t, buf, buflen, &v, a[0], a[1], uint32(uid), uint32(gid), gecos, a[5], a[6]) {
 				*(*pwd.Passwd)(unsafe.Pointer(cpwd)) = v
 				*(*uintptr)(unsafe.Pointer(result)) = cpwd
 				return 0
 			}
 
 			*(*uintptr)(unsafe.Pointer(result)) = 0
 			return errno.ERANGE
 		}
 	}
 
 	if sc.Err() != nil {
 		panic(todo(""))
 	}
 
 	*(*uintptr)(unsafe.Pointer(result)) = 0
 	return 0
 }
 
 // int mkostemp(char *template, int flags);
 func Xmkostemp(t *TLS, template uintptr, flags int32) int32 {
 	len := uintptr(Xstrlen(t, template))
 	x := template + uintptr(len-6)
 	for i := uintptr(0); i < 6; i++ {
 		if *(*byte)(unsafe.Pointer(x + i)) != 'X' {
 			t.setErrno(errno.EINVAL)
 			return -1
 		}
 	}
 
 	fd, err := tempFile(template, x, flags)
 	if err != nil {
 		t.setErrno(err)
 		return -1
 	}
 
 	return int32(fd)
 }
 
 // void uuid_generate_random(uuid_t out);
 func Xuuid_generate_random(t *TLS, out uintptr) {
 	x := guuid.New()
 	copy((*RawMem)(unsafe.Pointer(out))[:], x[:])
 }
 
 // void uuid_unparse(uuid_t uu, char *out);
 func Xuuid_unparse(t *TLS, uu, out uintptr) {
 	s := (*guuid.UUID)(unsafe.Pointer(uu)).String()
 	copy((*RawMem)(unsafe.Pointer(out))[:], s)
 	*(*byte)(unsafe.Pointer(out + uintptr(len(s)))) = 0
 }
 
 var staticRandomData = &rand.Rand{}
 
 // char *initstate(unsigned seed, char *state, size_t size);
 func Xinitstate(t *TLS, seed uint32, statebuf uintptr, statelen types.Size_t) uintptr {
 	staticRandomData = rand.New(rand.NewSource(int64(seed)))
 	return 0
 }
 
 // char *setstate(const char *state);
 func Xsetstate(t *TLS, state uintptr) uintptr {
 	t.setErrno(errno.EINVAL) //TODO
 	return 0
 }
 
 // The initstate_r() function is like initstate(3) except that it initializes
 // the state in the object pointed to by buf, rather than initializing the
 // global state  variable.   Before  calling this function, the buf.state field
 // must be initialized to NULL.  The initstate_r() function records a pointer
 // to the statebuf argument inside the structure pointed to by buf.  Thus,
 // state‐ buf should not be deallocated so long as buf is still in use.  (So,
 // statebuf should typically be allocated as a static variable, or allocated on
 // the heap using malloc(3) or similar.)
 //
 // char *initstate_r(unsigned int seed, char *statebuf, size_t statelen, struct random_data *buf);
 func Xinitstate_r(t *TLS, seed uint32, statebuf uintptr, statelen types.Size_t, buf uintptr) int32 {
 	if buf == 0 {
 		panic(todo(""))
 	}
 
 	randomDataMu.Lock()
 
 	defer randomDataMu.Unlock()
 
 	randomData[buf] = rand.New(rand.NewSource(int64(seed)))
 	return 0
 }
 
 var (
 	randomData   = map[uintptr]*rand.Rand{}
 	randomDataMu sync.Mutex
 )
 
 // int mkstemps(char *template, int suffixlen);
 func Xmkstemps(t *TLS, template uintptr, suffixlen int32) int32 {
 	return Xmkstemps64(t, template, suffixlen)
 }
 
 // int mkstemps(char *template, int suffixlen);
 func Xmkstemps64(t *TLS, template uintptr, suffixlen int32) int32 {
 	len := uintptr(Xstrlen(t, template))
 	x := template + uintptr(len-6) - uintptr(suffixlen)
 	for i := uintptr(0); i < 6; i++ {
 		if *(*byte)(unsafe.Pointer(x + i)) != 'X' {
 			t.setErrno(errno.EINVAL)
 			return -1
 		}
 	}
 
 	fd, err := tempFile(template, x, 0)
 	if err != nil {
 		t.setErrno(err)
 		return -1
 	}
 
 	return int32(fd)
 }
 
 // int mkstemp(char *template);
 func Xmkstemp(t *TLS, template uintptr) int32 {
 	return Xmkstemp64(t, template)
 }
 
 // int mkstemp(char *template);
 func Xmkstemp64(t *TLS, template uintptr) int32 {
 	return Xmkstemps64(t, template, 0)
 }
 
 // int random_r(struct random_data *buf, int32_t *result);
 func Xrandom_r(t *TLS, buf, result uintptr) int32 {
 	randomDataMu.Lock()
 
 	defer randomDataMu.Unlock()
 
 	mr := randomData[buf]
 	if stdlib.RAND_MAX != math.MaxInt32 {
 		panic(todo(""))
 	}
 	*(*int32)(unsafe.Pointer(result)) = mr.Int31()
 	return 0
 }
 
 // int strerror_r(int errnum, char *buf, size_t buflen);
 func Xstrerror_r(t *TLS, errnum int32, buf uintptr, buflen size_t) int32 {
 	panic(todo(""))
 }
 
 // void endpwent(void);
 func Xendpwent(t *TLS) {
 	// nop
 }
 
 var ctimeStaticBuf [32]byte
 
 // char *ctime(const time_t *timep);
 func Xctime(t *TLS, timep uintptr) uintptr {
 	return Xctime_r(t, timep, uintptr(unsafe.Pointer(&ctimeStaticBuf[0])))
 }
 
 // char *ctime_r(const time_t *timep, char *buf);
 func Xctime_r(t *TLS, timep, buf uintptr) uintptr {
 	ut := *(*ctime.Time_t)(unsafe.Pointer(timep))
 	tm := time.Unix(int64(ut), 0).Local()
 	s := tm.Format(time.ANSIC) + "\n\x00"
 	copy((*RawMem)(unsafe.Pointer(buf))[:26:26], s)
 	return buf
 }