// 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.

package libc // import "modernc.org/libc"

import (
	"bufio"
	"encoding/hex"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"syscall"
	gotime "time"
	"unsafe"

	"golang.org/x/sys/unix"
	"modernc.org/libc/errno"
	"modernc.org/libc/fcntl"
	"modernc.org/libc/fts"

	gonetdb "modernc.org/libc/honnef.co/go/netdb"
	"modernc.org/libc/langinfo"
	"modernc.org/libc/limits"
	"modernc.org/libc/netdb"
	"modernc.org/libc/netinet/in"
	"modernc.org/libc/pwd"

	"modernc.org/libc/signal"
	"modernc.org/libc/stdio"
	"modernc.org/libc/sys/socket"
	"modernc.org/libc/sys/stat"
	"modernc.org/libc/sys/types"
	"modernc.org/libc/termios"
	"modernc.org/libc/time"
	"modernc.org/libc/unistd"
)

const (
	maxPathLen = 1024
)

// var (
// 	in6_addr_any in.In6_addr
// )

type (
	long  = types.User_long_t
	ulong = types.User_ulong_t
)

// // Keep these outside of the var block otherwise go generate will miss them.
var X__stderrp = Xstdout
var X__stdinp = Xstdin
var X__stdoutp = Xstdout

type file uintptr

func (f file) fd() int32      { return int32((*stdio.FILE)(unsafe.Pointer(f)).F_file) }
func (f file) setFd(fd int32) { (*stdio.FILE)(unsafe.Pointer(f)).F_file = int16(fd) }

func (f file) err() bool {
	return (*stdio.FILE)(unsafe.Pointer(f)).F_flags&1 != 0
}

func (f file) setErr() {
	(*stdio.FILE)(unsafe.Pointer(f)).F_flags |= 1
}

func (f file) close(t *TLS) int32 {
	r := Xclose(t, f.fd())
	Xfree(t, uintptr(f))
	if r < 0 {
		return stdio.EOF
	}

	return 0
}

func newFile(t *TLS, fd int32) uintptr {
	p := Xcalloc(t, 1, types.Size_t(unsafe.Sizeof(stdio.FILE{})))
	if p == 0 {
		return 0
	}

	file(p).setFd(fd)
	return p
}

func fwrite(fd int32, b []byte) (int, error) {
	if fd == unistd.STDOUT_FILENO {
		return write(b)
	}

	if dmesgs {
		dmesg("%v: fd %v: %s", origin(1), fd, hex.Dump(b))
	}
	return unix.Write(int(fd), b)
}

func X__inline_isnand(t *TLS, x float64) int32 { return Xisnan(t, x) }
func X__inline_isnanf(t *TLS, x float32) int32 { return Xisnanf(t, x) }
func X__inline_isnanl(t *TLS, x float64) int32 { return Xisnan(t, x) }

// int fprintf(FILE *stream, const char *format, ...);
func Xfprintf(t *TLS, stream, format, args uintptr) int32 {
	n, _ := fwrite(int32((*stdio.FILE)(unsafe.Pointer(stream)).F_file), printf(format, args))
	return int32(n)
}

// int usleep(useconds_t usec);
func Xusleep(t *TLS, usec types.Useconds_t) int32 {
	gotime.Sleep(gotime.Microsecond * gotime.Duration(usec))
	return 0
}

// int futimes(int fd, const struct timeval tv[2]);
func Xfutimes(t *TLS, fd int32, tv uintptr) int32 {
	var a []unix.Timeval
	if tv != 0 {
		a = make([]unix.Timeval, 2)
		a[0] = *(*unix.Timeval)(unsafe.Pointer(tv))
		a[1] = *(*unix.Timeval)(unsafe.Pointer(tv + unsafe.Sizeof(unix.Timeval{})))
	}
	if err := unix.Futimes(int(fd), a); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// void srandomdev(void);
func Xsrandomdev(t *TLS) {
	panic(todo(""))
}

// int gethostuuid(uuid_t id, const struct timespec *wait);
func Xgethostuuid(t *TLS, id uintptr, wait uintptr) int32 {
	if _, _, err := unix.Syscall(unix.SYS_GETHOSTUUID, id, wait, 0); err != 0 { // Cannot avoid the syscall here.
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// int flock(int fd, int operation);
func Xflock(t *TLS, fd, operation int32) int32 {
	if err := unix.Flock(int(fd), int(operation)); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// int fsctl(const char *,unsigned long,void*,unsigned int);
func Xfsctl(t *TLS, path uintptr, request ulong, data uintptr, options uint32) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall6(unix.SYS_FSCTL, path, uintptr(request), data, uintptr(options), 0, 0); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// int * __error(void);
func X__error(t *TLS) uintptr {
	return t.errnop
}

// int isspace(int c);
func Xisspace(t *TLS, c int32) int32 {
	return __isspace(t, c)
}

// void __assert_rtn(const char *, const char *, int, const char *)
func X__assert_rtn(t *TLS, function, file uintptr, line int32, assertion uintptr) {
	panic(todo(""))
	// fmt.Fprintf(os.Stderr, "assertion failure: %s:%d.%s: %s\n", GoString(file), line, GoString(function), GoString(assertion))
	// os.Stderr.Sync()
	// Xexit(t, 1)
}

// int getrusage(int who, struct rusage *usage);
func Xgetrusage(t *TLS, who int32, usage uintptr) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall(unix.SYS_GETRUSAGE, uintptr(who), usage, 0); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// char *fgets(char *s, int size, FILE *stream);
func Xfgets(t *TLS, s uintptr, size int32, stream uintptr) uintptr {
	fd := int((*stdio.FILE)(unsafe.Pointer(stream)).F_file)
	var b []byte
	buf := [1]byte{}
	for ; size > 0; size-- {
		n, err := unix.Read(fd, buf[:])
		if n != 0 {
			b = append(b, buf[0])
			if buf[0] == '\n' {
				b = append(b, 0)
				copy((*RawMem)(unsafe.Pointer(s))[:len(b):len(b)], b)
				return s
			}

			continue
		}

		switch {
		case n == 0 && err == nil && len(b) == 0:
			return 0
		default:
			panic(todo(""))
		}

		// if err == nil {
		// 	panic("internal error")
		// }

		// if len(b) != 0 {
		// 		b = append(b, 0)
		// 		copy((*RawMem)(unsafe.Pointer(s)[:len(b)]), b)
		// 		return s
		// }

		// t.setErrno(err)
	}
	panic(todo(""))
}

// int lstat(const char *pathname, struct stat *statbuf);
func Xlstat(t *TLS, pathname, statbuf uintptr) int32 {
	return Xlstat64(t, pathname, statbuf)
}

// int stat(const char *pathname, struct stat *statbuf);
func Xstat(t *TLS, pathname, statbuf uintptr) int32 {
	return Xstat64(t, pathname, statbuf)
}

// int chdir(const char *path);
func Xchdir(t *TLS, path uintptr) int32 {
	if err := unix.Chdir(GoString(path)); err != nil {
		if dmesgs {
			dmesg("%v: %q: %v FAIL", origin(1), GoString(path), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: %q: ok", origin(1), GoString(path))
	}
	return 0
}

var localtime time.Tm

// struct tm *localtime(const time_t *timep);
func Xlocaltime(_ *TLS, timep uintptr) uintptr {
	loc := gotime.Local
	if r := getenv(Environ(), "TZ"); r != 0 {
		zone, off := parseZone(GoString(r))
		loc = gotime.FixedZone(zone, -off)
	}
	ut := *(*time.Time_t)(unsafe.Pointer(timep))
	t := gotime.Unix(int64(ut), 0).In(loc)
	localtime.Ftm_sec = int32(t.Second())
	localtime.Ftm_min = int32(t.Minute())
	localtime.Ftm_hour = int32(t.Hour())
	localtime.Ftm_mday = int32(t.Day())
	localtime.Ftm_mon = int32(t.Month() - 1)
	localtime.Ftm_year = int32(t.Year() - 1900)
	localtime.Ftm_wday = int32(t.Weekday())
	localtime.Ftm_yday = int32(t.YearDay())
	localtime.Ftm_isdst = Bool32(isTimeDST(t))
	return uintptr(unsafe.Pointer(&localtime))
}

// struct tm *localtime_r(const time_t *timep, struct tm *result);
func Xlocaltime_r(_ *TLS, timep, result uintptr) uintptr {
	panic(todo(""))
	// loc := gotime.Local
	// if r := getenv(Environ(), "TZ"); r != 0 {
	// 	zone, off := parseZone(GoString(r))
	// 	loc = gotime.FixedZone(zone, -off)
	// }
	// ut := *(*unix.Time_t)(unsafe.Pointer(timep))
	// t := gotime.Unix(int64(ut), 0).In(loc)
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_sec = int32(t.Second())
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_min = int32(t.Minute())
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_hour = int32(t.Hour())
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_mday = int32(t.Day())
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_mon = int32(t.Month() - 1)
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_year = int32(t.Year() - 1900)
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_wday = int32(t.Weekday())
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_yday = int32(t.YearDay())
	// (*time.Tm)(unsafe.Pointer(result)).Ftm_isdst = Bool32(isTimeDST(t))
	// return result
}

// int open(const char *pathname, int flags, ...);
func Xopen(t *TLS, pathname uintptr, flags int32, args uintptr) int32 {
	var mode types.Mode_t
	if args != 0 {
		mode = (types.Mode_t)(VaUint32(&args))
	}
	fd, err := unix.Open(GoString(pathname), int(flags), uint32(mode))
	if err != nil {
		if dmesgs {
			dmesg("%v: %q %#x %#o: %v FAIL", origin(1), GoString(pathname), flags, mode, err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: %q flags %#x mode %#o: fd %v", origin(1), GoString(pathname), flags, mode, fd)
	}
	return int32(fd)
}

// off_t lseek(int fd, off_t offset, int whence);
func Xlseek(t *TLS, fd int32, offset types.Off_t, whence int32) types.Off_t {
	return types.Off_t(Xlseek64(t, fd, offset, whence))
}

func whenceStr(whence int32) string {
	switch whence {
	case fcntl.SEEK_CUR:
		return "SEEK_CUR"
	case fcntl.SEEK_END:
		return "SEEK_END"
	case fcntl.SEEK_SET:
		return "SEEK_SET"
	default:
		return fmt.Sprintf("whence(%d)", whence)
	}
}

var fsyncStatbuf stat.Stat

// int fsync(int fd);
func Xfsync(t *TLS, fd int32) int32 {
	if noFsync {
		// Simulate -DSQLITE_NO_SYNC for sqlite3 testfixture, see function full_sync in sqlite3.c
		return Xfstat(t, fd, uintptr(unsafe.Pointer(&fsyncStatbuf)))
	}

	if err := unix.Fsync(int(fd)); err != nil {
		if dmesgs {
			dmesg("%v: %v: %v FAIL", origin(1), fd, err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: %d: ok", origin(1), fd)
	}
	return 0
}

// long sysconf(int name);
func Xsysconf(t *TLS, name int32) long {
	switch name {
	case unistd.X_SC_PAGESIZE:
		return long(unix.Getpagesize())
	}

	panic(todo(""))
}

// int close(int fd);
func Xclose(t *TLS, fd int32) int32 {
	if err := unix.Close(int(fd)); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: %d: ok", origin(1), fd)
	}
	return 0
}

// char *getcwd(char *buf, size_t size);
func Xgetcwd(t *TLS, buf uintptr, size types.Size_t) uintptr {
	if _, err := unix.Getcwd((*RawMem)(unsafe.Pointer(buf))[:size:size]); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return 0
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return buf
}

// int fstat(int fd, struct stat *statbuf);
func Xfstat(t *TLS, fd int32, statbuf uintptr) int32 {
	return Xfstat64(t, fd, statbuf)
}

// int ftruncate(int fd, off_t length);
func Xftruncate(t *TLS, fd int32, length types.Off_t) int32 {
	if err := unix.Ftruncate(int(fd), int64(length)); err != nil {
		if dmesgs {
			dmesg("%v: fd %d: %v FAIL", origin(1), fd, err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: %d %#x: ok", origin(1), fd, length)
	}
	return 0
}

// int fcntl(int fd, int cmd, ... /* arg */ );
func Xfcntl(t *TLS, fd, cmd int32, args uintptr) int32 {
	return Xfcntl64(t, fd, cmd, args)
}

// ssize_t read(int fd, void *buf, size_t count);
func Xread(t *TLS, fd int32, buf uintptr, count types.Size_t) types.Ssize_t {
	var n int
	var err error
	switch {
	case count == 0:
		n, err = unix.Read(int(fd), nil)
	default:
		n, err = unix.Read(int(fd), (*RawMem)(unsafe.Pointer(buf))[:count:count])
		if dmesgs && err == nil {
			dmesg("%v: fd %v, count %#x, n %#x\n%s", origin(1), fd, count, n, hex.Dump((*RawMem)(unsafe.Pointer(buf))[:n:n]))
		}
	}
	if err != nil {
		if dmesgs {
			dmesg("%v: fd %v, %v FAIL", origin(1), fd, err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return types.Ssize_t(n)
}

// ssize_t write(int fd, const void *buf, size_t count);
func Xwrite(t *TLS, fd int32, buf uintptr, count types.Size_t) types.Ssize_t {
	var n int
	var err error
	switch {
	case count == 0:
		n, err = unix.Write(int(fd), nil)
	default:
		n, err = unix.Write(int(fd), (*RawMem)(unsafe.Pointer(buf))[:count:count])
		if dmesgs {
			dmesg("%v: fd %v, count %#x\n%s", origin(1), fd, count, hex.Dump((*RawMem)(unsafe.Pointer(buf))[:count:count]))
		}
	}
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return types.Ssize_t(n)
}

// int fchmod(int fd, mode_t mode);
func Xfchmod(t *TLS, fd int32, mode types.Mode_t) int32 {
	if err := unix.Fchmod(int(fd), uint32(mode)); err != nil {
		if dmesgs {
			dmesg("%v: %d %#o: %v FAIL", origin(1), fd, mode, err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: %d %#o: ok", origin(1), fd, mode)
	}
	return 0
}

// int fchown(int fd, uid_t owner, gid_t group);
func Xfchown(t *TLS, fd int32, owner types.Uid_t, group types.Gid_t) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall(unix.SYS_FCHOWN, uintptr(fd), uintptr(owner), uintptr(group)); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// uid_t geteuid(void);
func Xgeteuid(t *TLS) types.Uid_t {
	r := types.Uid_t(unix.Geteuid())
	if dmesgs {
		dmesg("%v: %v", origin(1), r)
	}
	return r
}

// void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset);
func Xmmap(t *TLS, addr uintptr, length types.Size_t, prot, flags, fd int32, offset types.Off_t) uintptr {
	// Cannot avoid the syscall here, addr sometimes matter.
	data, _, err := unix.Syscall6(unix.SYS_MMAP, addr, uintptr(length), uintptr(prot), uintptr(flags), uintptr(fd), uintptr(offset))
	if err != 0 {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return ^uintptr(0) // (void*)-1
	}

	if dmesgs {
		dmesg("%v: %#x", origin(1), data)
	}
	return data
}

// int munmap(void *addr, size_t length);
func Xmunmap(t *TLS, addr uintptr, length types.Size_t) int32 {
	if _, _, err := unix.Syscall(unix.SYS_MUNMAP, addr, uintptr(length), 0); err != 0 { // Cannot avoid the syscall here, must pair with mmap.
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	return 0
}

// int gettimeofday(struct timeval *tv, struct timezone *tz);
func Xgettimeofday(t *TLS, tv, tz uintptr) int32 {
	if tz != 0 {
		panic(todo(""))
	}

	var tvs unix.Timeval
	err := unix.Gettimeofday(&tvs)
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	*(*unix.Timeval)(unsafe.Pointer(tv)) = tvs
	return 0
}

// int getsockopt(int sockfd, int level, int optname, void *optval, socklen_t *optlen);
func Xgetsockopt(t *TLS, sockfd, level, optname int32, optval, optlen uintptr) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall6(unix.SYS_GETSOCKOPT, uintptr(sockfd), uintptr(level), uintptr(optname), optval, optlen, 0); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen);
func Xsetsockopt(t *TLS, sockfd, level, optname int32, optval uintptr, optlen socket.Socklen_t) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall6(unix.SYS_SETSOCKOPT, uintptr(sockfd), uintptr(level), uintptr(optname), optval, uintptr(optlen), 0); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// int ioctl(int fd, unsigned long request, ...);
func Xioctl(t *TLS, fd int32, request ulong, va uintptr) int32 {
	panic(todo(""))
	// var argp uintptr
	// if va != 0 {
	// 	argp = VaUintptr(&va)
	// }
	// n, _, err := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(request), argp)
	// if err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return int32(n)
}

// int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
func Xgetsockname(t *TLS, sockfd int32, addr, addrlen uintptr) int32 {
	if _, _, err := unix.Syscall(unix.SYS_GETSOCKNAME, uintptr(sockfd), addr, addrlen); err != 0 { // Cannot avoid the syscall here.
		if dmesgs {
			dmesg("%v: fd %v: %v FAIL", origin(1), sockfd, err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: fd %v: ok", origin(1), sockfd)
	}
	return 0
}

// int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
func Xselect(t *TLS, nfds int32, readfds, writefds, exceptfds, timeout uintptr) int32 {
	n, err := unix.Select(
		int(nfds),
		(*unix.FdSet)(unsafe.Pointer(readfds)),
		(*unix.FdSet)(unsafe.Pointer(writefds)),
		(*unix.FdSet)(unsafe.Pointer(exceptfds)),
		(*unix.Timeval)(unsafe.Pointer(timeout)),
	)
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return int32(n)
}

// int mkfifo(const char *pathname, mode_t mode);
func Xmkfifo(t *TLS, pathname uintptr, mode types.Mode_t) int32 {
	panic(todo(""))
	// if err := unix.Mkfifo(GoString(pathname), mode); err != nil {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// mode_t umask(mode_t mask);
func Xumask(t *TLS, mask types.Mode_t) types.Mode_t {
	return types.Mode_t(unix.Umask(int(mask)))
}

// // int execvp(const char *file, char *const argv[]);
// func Xexecvp(t *TLS, file, argv uintptr) int32 {
// 	if _, _, err := unix.Syscall(unix.SYS_EXECVE, file, argv, Environ()); err != 0 {
// 		t.setErrno(err)
// 		return -1
// 	}
//
// 	return 0
// }

// pid_t (pid_t pid, int *wstatus, int options);
func Xwaitpid(t *TLS, pid types.Pid_t, wstatus uintptr, optname int32) types.Pid_t {
	n, err := unix.Wait4(int(pid), (*unix.WaitStatus)(unsafe.Pointer(wstatus)), int(optname), nil)
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return types.Pid_t(n)
}

// int uname(struct utsname *buf);
func Xuname(t *TLS, buf uintptr) int32 {
	if err := unix.Uname((*unix.Utsname)(unsafe.Pointer(buf))); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// ssize_t recv(int sockfd, void *buf, size_t len, int flags);
func Xrecv(t *TLS, sockfd int32, buf uintptr, len types.Size_t, flags int32) types.Ssize_t {
	panic(todo(""))
	// n, _, err := unix.Syscall6(unix.SYS_RECVFROM, uintptr(sockfd), buf, uintptr(len), uintptr(flags), 0, 0)
	// if err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return types.Ssize_t(n)
}

// ssize_t send(int sockfd, const void *buf, size_t len, int flags);
func Xsend(t *TLS, sockfd int32, buf uintptr, len types.Size_t, flags int32) types.Ssize_t {
	panic(todo(""))
	// n, _, err := unix.Syscall6(unix.SYS_SENDTO, uintptr(sockfd), buf, uintptr(len), uintptr(flags), 0, 0)
	// if err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return types.Ssize_t(n)
}

// int shutdown(int sockfd, int how);
func Xshutdown(t *TLS, sockfd, how int32) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall(unix.SYS_SHUTDOWN, uintptr(sockfd), uintptr(how), 0); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// int getpeername(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
func Xgetpeername(t *TLS, sockfd int32, addr uintptr, addrlen uintptr) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall(unix.SYS_GETPEERNAME, uintptr(sockfd), addr, uintptr(addrlen)); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// int socket(int domain, int type, int protocol);
func Xsocket(t *TLS, domain, type1, protocol int32) int32 {
	panic(todo(""))
	// n, _, err := unix.Syscall(unix.SYS_SOCKET, uintptr(domain), uintptr(type1), uintptr(protocol))
	// if err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return int32(n)
}

// int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen);
func Xbind(t *TLS, sockfd int32, addr uintptr, addrlen uint32) int32 {
	panic(todo(""))
	// n, _, err := unix.Syscall(unix.SYS_BIND, uintptr(sockfd), addr, uintptr(addrlen))
	// if err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return int32(n)
}

// int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);
func Xconnect(t *TLS, sockfd int32, addr uintptr, addrlen uint32) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall(unix.SYS_CONNECT, uintptr(sockfd), addr, uintptr(addrlen)); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// int listen(int sockfd, int backlog);
func Xlisten(t *TLS, sockfd, backlog int32) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall(unix.SYS_LISTEN, uintptr(sockfd), uintptr(backlog), 0); err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return 0
}

// int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
func Xaccept(t *TLS, sockfd int32, addr uintptr, addrlen uintptr) int32 {
	panic(todo(""))
	// n, _, err := unix.Syscall6(unix.SYS_ACCEPT4, uintptr(sockfd), addr, uintptr(addrlen), 0, 0, 0)
	// if err != 0 {
	// 	t.setErrno(err)
	// 	return -1
	// }

	// return int32(n)
}

// // int getrlimit(int resource, struct rlimit *rlim);
// func Xgetrlimit(t *TLS, resource int32, rlim uintptr) int32 {
// 	return Xgetrlimit64(t, resource, rlim)
// }
//
// // int setrlimit(int resource, const struct rlimit *rlim);
// func Xsetrlimit(t *TLS, resource int32, rlim uintptr) int32 {
// 	return Xsetrlimit64(t, resource, rlim)
// }
//
// // int setrlimit(int resource, const struct rlimit *rlim);
// func Xsetrlimit64(t *TLS, resource int32, rlim uintptr) int32 {
// 	if _, _, err := unix.Syscall(unix.SYS_SETRLIMIT, uintptr(resource), uintptr(rlim), 0); err != 0 {
// 		t.setErrno(err)
// 		return -1
// 	}
//
// 	return 0
// }

// uid_t getuid(void);
func Xgetuid(t *TLS) types.Uid_t {
	r := types.Uid_t(os.Getuid())
	if dmesgs {
		dmesg("%v: %v", origin(1), r)
	}
	return r
}

// pid_t getpid(void);
func Xgetpid(t *TLS) int32 {
	r := int32(os.Getpid())
	if dmesgs {
		dmesg("%v: %v", origin(1), r)
	}
	return r
}

// int system(const char *command);
func Xsystem(t *TLS, command uintptr) int32 {
	s := GoString(command)
	if command == 0 {
		panic(todo(""))
	}

	cmd := exec.Command("sh", "-c", s)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	err := cmd.Run()
	if err != nil {
		ps := err.(*exec.ExitError)
		return int32(ps.ExitCode())
	}

	return 0
}

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{}
}

// struct passwd *getpwuid(uid_t uid);
func Xgetpwuid(t *TLS, uid uint32) uintptr {
	f, err := os.Open("/etc/passwd")
	if err != nil {
		if dmesgs {
			dmesg("%v: %v", origin(1), err)
		}
		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(sc.Text(), ":")
		if len(a) < 7 {
			panic(todo("%q", sc.Text()))
		}

		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])
			if dmesgs {
				dmesg("%v: ok", origin(1))
			}
			return uintptr(unsafe.Pointer(&staticGetpwuid))
		}
	}

	if sc.Err() != nil {
		panic(todo(""))
	}

	if dmesgs {
		dmesg("%v: 0", origin(1))
	}
	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)
}

// int setvbuf(FILE *stream, char *buf, int mode, size_t size);
func Xsetvbuf(t *TLS, stream, buf uintptr, mode int32, size types.Size_t) int32 {
	return 0 //TODO
}

// int raise(int sig);
func Xraise(t *TLS, sig int32) int32 {
	panic(todo(""))
}

// // int backtrace(void **buffer, int size);
// func Xbacktrace(t *TLS, buf uintptr, size int32) int32 {
// 	panic(todo(""))
// }
//
// // void backtrace_symbols_fd(void *const *buffer, int size, int fd);
// func Xbacktrace_symbols_fd(t *TLS, buffer uintptr, size, fd int32) {
// 	panic(todo(""))
// }

// int fileno(FILE *stream);
func Xfileno(t *TLS, stream uintptr) int32 {
	if stream == 0 {
		if dmesgs {
			dmesg("%v: FAIL", origin(1))
		}
		t.setErrno(errno.EBADF)
		return -1
	}

	if fd := int32((*stdio.FILE)(unsafe.Pointer(stream)).F_file); fd >= 0 {
		return fd
	}

	if dmesgs {
		dmesg("%v: FAIL", origin(1))
	}
	t.setErrno(errno.EBADF)
	return -1
}

// var staticGetpwnam pwd.Passwd
//
// func init() {
// 	atExit = append(atExit, func() { closePasswd(&staticGetpwnam) })
// }

// struct passwd *getpwnam(const char *name);
func Xgetpwnam(t *TLS, name uintptr) uintptr {
	panic(todo(""))
	// 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() {
	// 	// eg. "root:x:0:0:root:/root:/bin/bash"
	// 	a := strings.Split(sc.Text(), ":")
	// 	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
}

// var staticGetgrnam grp.Group
//
// func init() {
// 	atExit = append(atExit, func() { closeGroup(&staticGetgrnam) })
// }

// struct group *getgrnam(const char *name);
func Xgetgrnam(t *TLS, name uintptr) uintptr {
	panic(todo(""))
	// f, err := os.Open("/etc/group")
	// if err != nil {
	// 	panic(todo(""))
	// }

	// defer f.Close()

	// sname := GoString(name)
	// sc := bufio.NewScanner(f)
	// for sc.Scan() {
	// 	// eg. "root:x:0:"
	// 	a := strings.Split(sc.Text(), ":")
	// 	if len(a) < 4 {
	// 		panic(todo(""))
	// 	}

	// 	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
}

// func closeGroup(p *grp.Group) {
// 	Xfree(nil, p.Fgr_name)
// 	Xfree(nil, p.Fgr_passwd)
// 	if p.Fgr_mem != 0 {
// 		panic(todo(""))
// 	}
//
// 	*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
// 	p.Fgr_mem = 0
// 	if len(names) != 0 {
// 		panic(todo("%q %q %v %q %v", name, pwd, gid, names, len(names)))
// 	}
// }
//
// 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 {
	panic(todo(""))
	// 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() {
	// 	// eg. "root:x:0:"
	// 	a := strings.Split(sc.Text(), ":")
	// 	if len(a) < 4 {
	// 		panic(todo(""))
	// 	}

	// 	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 mkstemps(char *template, int suffixlen);
func Xmkstemps(t *TLS, template uintptr, suffixlen int32) int32 {
	panic(todo(""))
}

// 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' {
			if dmesgs {
				dmesg("%v: FAIL", origin(1))
			}
			t.setErrno(errno.EINVAL)
			return -1
		}
	}

	fd, err := tempFile(template, x)
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	return int32(fd)
}

// int mkstemp(char *template);
func Xmkstemp(t *TLS, template uintptr) int32 {
	return Xmkstemps64(t, template, 0)
}

func newFtsent(t *TLS, info int, path string, stat *unix.Stat_t, err syscall.Errno) (r *fts.FTSENT) {
	var statp uintptr
	if stat != nil {
		statp = Xmalloc(t, types.Size_t(unsafe.Sizeof(unix.Stat_t{})))
		if statp == 0 {
			panic("OOM")
		}

		*(*unix.Stat_t)(unsafe.Pointer(statp)) = *stat
	}
	csp, errx := CString(path)
	if errx != nil {
		panic("OOM")
	}

	return &fts.FTSENT{
		Ffts_info:    uint16(info),
		Ffts_path:    csp,
		Ffts_pathlen: uint16(len(path)),
		Ffts_statp:   statp,
		Ffts_errno:   int32(err),
	}
}

func newCFtsent(t *TLS, info int, path string, stat *unix.Stat_t, err syscall.Errno) uintptr {
	p := Xcalloc(t, 1, types.Size_t(unsafe.Sizeof(fts.FTSENT{})))
	if p == 0 {
		panic("OOM")
	}

	*(*fts.FTSENT)(unsafe.Pointer(p)) = *newFtsent(t, info, path, stat, err)
	return p
}

func ftsentClose(t *TLS, p uintptr) {
	Xfree(t, (*fts.FTSENT)(unsafe.Pointer(p)).Ffts_path)
	Xfree(t, (*fts.FTSENT)(unsafe.Pointer(p)).Ffts_statp)
}

type ftstream struct {
	s []uintptr
	x int
}

func (f *ftstream) close(t *TLS) {
	for _, p := range f.s {
		ftsentClose(t, p)
		Xfree(t, p)
	}
	*f = ftstream{}
}

// FTS *fts_open(char * const *path_argv, int options, int (*compar)(const FTSENT **, const FTSENT **));
func Xfts_open(t *TLS, path_argv uintptr, options int32, compar uintptr) uintptr {
	f := &ftstream{}

	var walk func(string)
	walk = func(path string) {
		var fi os.FileInfo
		var err error
		switch {
		case options&fts.FTS_LOGICAL != 0:
			fi, err = os.Stat(path)
		case options&fts.FTS_PHYSICAL != 0:
			fi, err = os.Lstat(path)
		default:
			panic(todo(""))
		}

		if err != nil {
			return
		}

		var statp *unix.Stat_t
		if options&fts.FTS_NOSTAT == 0 {
			var stat unix.Stat_t
			switch {
			case options&fts.FTS_LOGICAL != 0:
				if err := unix.Stat(path, &stat); err != nil {
					panic(todo(""))
				}
			case options&fts.FTS_PHYSICAL != 0:
				if err := unix.Lstat(path, &stat); err != nil {
					panic(todo(""))
				}
			default:
				panic(todo(""))
			}

			statp = &stat
		}

	out:
		switch {
		case fi.IsDir():
			f.s = append(f.s, newCFtsent(t, fts.FTS_D, path, statp, 0))
			g, err := os.Open(path)
			switch x := err.(type) {
			case nil:
				// ok
			case *os.PathError:
				f.s = append(f.s, newCFtsent(t, fts.FTS_DNR, path, statp, errno.EACCES))
				break out
			default:
				panic(todo("%q: %v %T", path, x, x))
			}

			names, err := g.Readdirnames(-1)
			g.Close()
			if err != nil {
				panic(todo(""))
			}

			for _, name := range names {
				walk(path + "/" + name)
				if f == nil {
					break out
				}
			}

			f.s = append(f.s, newCFtsent(t, fts.FTS_DP, path, statp, 0))
		default:
			info := fts.FTS_F
			if fi.Mode()&os.ModeSymlink != 0 {
				info = fts.FTS_SL
			}
			switch {
			case statp != nil:
				f.s = append(f.s, newCFtsent(t, info, path, statp, 0))
			case options&fts.FTS_NOSTAT != 0:
				f.s = append(f.s, newCFtsent(t, fts.FTS_NSOK, path, nil, 0))
			default:
				panic(todo(""))
			}
		}
	}

	for {
		p := *(*uintptr)(unsafe.Pointer(path_argv))
		if p == 0 {
			if f == nil {
				return 0
			}

			if compar != 0 {
				panic(todo(""))
			}

			return addObject(f)
		}

		walk(GoString(p))
		path_argv += unsafe.Sizeof(uintptr(0))
	}
}

// FTSENT *fts_read(FTS *ftsp);
func Xfts_read(t *TLS, ftsp uintptr) uintptr {
	f := getObject(ftsp).(*ftstream)
	if f.x == len(f.s) {
		if dmesgs {
			dmesg("%v: FAIL", origin(1))
		}
		t.setErrno(0)
		return 0
	}

	r := f.s[f.x]
	if e := (*fts.FTSENT)(unsafe.Pointer(r)).Ffts_errno; e != 0 {
		if dmesgs {
			dmesg("%v: FAIL", origin(1))
		}
		t.setErrno(e)
	}
	f.x++
	return r
}

// int fts_close(FTS *ftsp);
func Xfts_close(t *TLS, ftsp uintptr) int32 {
	getObject(ftsp).(*ftstream).close(t)
	removeObject(ftsp)
	return 0
}

// void tzset (void);
func Xtzset(t *TLS) {
	//TODO
}

// char *strerror(int errnum);
func Xstrerror(t *TLS, errnum int32) uintptr {
	panic(todo(""))
}

// void *dlopen(const char *filename, int flags);
func Xdlopen(t *TLS, filename uintptr, flags int32) uintptr {
	panic(todo(""))
}

// char *dlerror(void);
func Xdlerror(t *TLS) uintptr {
	panic(todo(""))
}

// int dlclose(void *handle);
func Xdlclose(t *TLS, handle uintptr) int32 {
	panic(todo(""))
}

// void *dlsym(void *handle, const char *symbol);
func Xdlsym(t *TLS, handle, symbol uintptr) uintptr {
	panic(todo(""))
}

// void perror(const char *s);
func Xperror(t *TLS, s uintptr) {
	panic(todo(""))
}

// int pclose(FILE *stream);
func Xpclose(t *TLS, stream uintptr) int32 {
	panic(todo(""))
}

// var gai_strerrorBuf [100]byte

// const char *gai_strerror(int errcode);
func Xgai_strerror(t *TLS, errcode int32) uintptr {
	panic(todo(""))
	// copy(gai_strerrorBuf[:], fmt.Sprintf("gai error %d\x00", errcode))
	// return uintptr(unsafe.Pointer(&gai_strerrorBuf))
}

// int tcgetattr(int fd, struct termios *termios_p);
func Xtcgetattr(t *TLS, fd int32, termios_p uintptr) int32 {
	panic(todo(""))
}

// int tcsetattr(int fd, int optional_actions, const struct termios *termios_p);
func Xtcsetattr(t *TLS, fd, optional_actions int32, termios_p uintptr) int32 {
	panic(todo(""))
}

// speed_t cfgetospeed(const struct termios *termios_p);
func Xcfgetospeed(t *TLS, termios_p uintptr) termios.Speed_t {
	panic(todo(""))
}

// int cfsetospeed(struct termios *termios_p, speed_t speed);
// func Xcfsetospeed(t *TLS, termios_p uintptr, speed uint32) int32 {
func Xcfsetospeed(...interface{}) int32 {
	panic(todo(""))
}

// int cfsetispeed(struct termios *termios_p, speed_t speed);
// func Xcfsetispeed(t *TLS, termios_p uintptr, speed uint32) int32 {
func Xcfsetispeed(...interface{}) int32 {
	panic(todo(""))
}

// pid_t fork(void);
func Xfork(t *TLS) int32 {
	if dmesgs {
		dmesg("%v: FAIL", origin(1))
	}
	t.setErrno(errno.ENOSYS)
	return -1
}

// char *setlocale(int category, const char *locale);
func Xsetlocale(t *TLS, category int32, locale uintptr) uintptr {
	return 0 //TODO
}

// char *nl_langinfo(nl_item item);
func Xnl_langinfo(t *TLS, item langinfo.Nl_item) uintptr {
	panic(todo(""))
}

// FILE *popen(const char *command, const char *type);
func Xpopen(t *TLS, command, type1 uintptr) uintptr {
	panic(todo(""))
}

// char *realpath(const char *path, char *resolved_path);
func Xrealpath(t *TLS, path, resolved_path uintptr) uintptr {
	s, err := filepath.EvalSymlinks(GoString(path))
	if err != nil {
		if os.IsNotExist(err) {
			if dmesgs {
				dmesg("%v: %q: %v FAIL", origin(1), GoString(path), err)
			}
			t.setErrno(errno.ENOENT)
			return 0
		}

		panic(todo("", err))
	}

	if resolved_path == 0 {
		panic(todo(""))
	}

	if len(s) >= limits.PATH_MAX {
		s = s[:limits.PATH_MAX-1]
	}

	copy((*RawMem)(unsafe.Pointer(resolved_path))[:len(s):len(s)], s)
	(*RawMem)(unsafe.Pointer(resolved_path))[len(s)] = 0
	if dmesgs {
		dmesg("%v: %q: ok", origin(1), GoString(path))
	}
	return resolved_path
}

// struct tm *gmtime_r(const time_t *timep, struct tm *result);
func Xgmtime_r(t *TLS, timep, result uintptr) uintptr {
	panic(todo(""))
}

// char *inet_ntoa(struct in_addr in);
func Xinet_ntoa(t *TLS, in1 in.In_addr) uintptr {
	panic(todo(""))
}

func X__ccgo_in6addr_anyp(t *TLS) uintptr {
	panic(todo(""))
	// return uintptr(unsafe.Pointer(&in6_addr_any))
}

func Xabort(t *TLS) {
	if dmesgs {
		dmesg("%v:", origin(1))
	}
	p := Xcalloc(t, 1, types.Size_t(unsafe.Sizeof(signal.Sigaction{})))
	if p == 0 {
		panic("OOM")
	}

	(*signal.Sigaction)(unsafe.Pointer(p)).F__sigaction_u.F__sa_handler = signal.SIG_DFL
	Xsigaction(t, signal.SIGABRT, p, 0)
	Xfree(t, p)
	unix.Kill(unix.Getpid(), syscall.Signal(signal.SIGABRT))
	panic(todo("unrechable"))
}

// int fflush(FILE *stream);
func Xfflush(t *TLS, stream uintptr) int32 {
	return 0 //TODO
}

// size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
func Xfread(t *TLS, ptr uintptr, size, nmemb types.Size_t, stream uintptr) types.Size_t {
	fd := uintptr(file(stream).fd())
	count := size * nmemb
	var n int
	var err error
	switch {
	case count == 0:
		n, err = unix.Read(int(fd), nil)
	default:
		n, err = unix.Read(int(fd), (*RawMem)(unsafe.Pointer(ptr))[:count:count])
		if dmesgs && err == nil {
			dmesg("%v: fd %v, n %#x\n%s", origin(1), fd, n, hex.Dump((*RawMem)(unsafe.Pointer(ptr))[:n:n]))
		}
	}
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		file(stream).setErr()
		return types.Size_t(n) / size
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return types.Size_t(n) / size
}

// size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
func Xfwrite(t *TLS, ptr uintptr, size, nmemb types.Size_t, stream uintptr) types.Size_t {
	fd := uintptr(file(stream).fd())
	count := size * nmemb
	var n int
	var err error
	switch {
	case count == 0:
		n, err = unix.Write(int(fd), nil)
	default:
		n, err = unix.Write(int(fd), (*RawMem)(unsafe.Pointer(ptr))[:count:count])
		if dmesgs {
			dmesg("%v: fd %v, count %#x\n%s", origin(1), fd, count, hex.Dump((*RawMem)(unsafe.Pointer(ptr))[:count:count]))
		}
	}
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		file(stream).setErr()
		return types.Size_t(n) / size
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return types.Size_t(n) / size
}

// int fclose(FILE *stream);
func Xfclose(t *TLS, stream uintptr) int32 {
	r := file(stream).close(t)
	if r != 0 {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), r)
		}
		t.setErrno(r)
		return stdio.EOF
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// int fputc(int c, FILE *stream);
func Xfputc(t *TLS, c int32, stream uintptr) int32 {
	if _, err := fwrite(file(stream).fd(), []byte{byte(c)}); err != nil {
		return stdio.EOF
	}

	return int32(byte(c))
}

// int fseek(FILE *stream, long offset, int whence);
func Xfseek(t *TLS, stream uintptr, offset long, whence int32) int32 {
	if n := Xlseek(t, int32(file(stream).fd()), types.Off_t(offset), whence); n < 0 {
		if dmesgs {
			dmesg("%v: fd %v, off %#x, whence %v: %v", origin(1), file(stream).fd(), offset, whenceStr(whence), n)
		}
		file(stream).setErr()
		return -1
	}

	if dmesgs {
		dmesg("%v: fd %v, off %#x, whence %v: ok", origin(1), file(stream).fd(), offset, whenceStr(whence))
	}
	return 0
}

// long ftell(FILE *stream);
func Xftell(t *TLS, stream uintptr) long {
	n := Xlseek(t, file(stream).fd(), 0, stdio.SEEK_CUR)
	if n < 0 {
		file(stream).setErr()
		return -1
	}

	if dmesgs {
		dmesg("%v: fd %v, n %#x: ok %#x", origin(1), file(stream).fd(), n, long(n))
	}
	return long(n)
}

// int ferror(FILE *stream);
func Xferror(t *TLS, stream uintptr) int32 {
	return Bool32(file(stream).err())
}

// int fgetc(FILE *stream);
func Xfgetc(t *TLS, stream uintptr) int32 {
	panic(todo(""))
}

// // int getc(FILE *stream);
// func Xgetc(t *TLS, stream uintptr) int32 {
// 	return Xfgetc(t, stream)
// }

// FILE *fdopen(int fd, const char *mode);
func Xfdopen(t *TLS, fd int32, mode uintptr) uintptr {
	panic(todo(""))
}

// int fputs(const char *s, FILE *stream);
func Xfputs(t *TLS, s, stream uintptr) int32 {
	panic(todo(""))
	// if _, _, err := unix.Syscall(unix.SYS_WRITE, uintptr(file(stream).fd()), s, uintptr(Xstrlen(t, s))); err != 0 {
	// 	return -1
	// }

	// return 0
}

var getservbynameStaticResult netdb.Servent

// struct servent *getservbyname(const char *name, const char *proto);
func Xgetservbyname(t *TLS, name, proto uintptr) uintptr {
	var protoent *gonetdb.Protoent
	if proto != 0 {
		protoent = gonetdb.GetProtoByName(GoString(proto))
	}
	servent := gonetdb.GetServByName(GoString(name), protoent)
	if servent == nil {
		if dmesgs {
			dmesg("%q %q: nil (protoent %+v)", GoString(name), GoString(proto), protoent)
		}
		return 0
	}

	Xfree(t, (*netdb.Servent)(unsafe.Pointer(&getservbynameStaticResult)).Fs_name)
	if v := (*netdb.Servent)(unsafe.Pointer(&getservbynameStaticResult)).Fs_aliases; v != 0 {
		for {
			p := *(*uintptr)(unsafe.Pointer(v))
			if p == 0 {
				break
			}

			Xfree(t, p)
			v += unsafe.Sizeof(uintptr(0))
		}
		Xfree(t, v)
	}
	Xfree(t, (*netdb.Servent)(unsafe.Pointer(&getservbynameStaticResult)).Fs_proto)
	cname, err := CString(servent.Name)
	if err != nil {
		getservbynameStaticResult = netdb.Servent{}
		return 0
	}

	var protoname uintptr
	if protoent != nil {
		if protoname, err = CString(protoent.Name); err != nil {
			Xfree(t, cname)
			getservbynameStaticResult = netdb.Servent{}
			return 0
		}
	}
	var a []uintptr
	for _, v := range servent.Aliases {
		cs, err := CString(v)
		if err != nil {
			for _, v := range a {
				Xfree(t, v)
			}
			return 0
		}

		a = append(a, cs)
	}
	v := Xcalloc(t, types.Size_t(len(a)+1), types.Size_t(unsafe.Sizeof(uintptr(0))))
	if v == 0 {
		Xfree(t, cname)
		Xfree(t, protoname)
		for _, v := range a {
			Xfree(t, v)
		}
		getservbynameStaticResult = netdb.Servent{}
		return 0
	}
	for _, p := range a {
		*(*uintptr)(unsafe.Pointer(v)) = p
		v += unsafe.Sizeof(uintptr(0))
	}

	getservbynameStaticResult = netdb.Servent{
		Fs_name:    cname,
		Fs_aliases: v,
		Fs_port:    int32(servent.Port),
		Fs_proto:   protoname,
	}
	return uintptr(unsafe.Pointer(&getservbynameStaticResult))
}

// //TODO- func Xreaddir64(t *TLS, dir uintptr) uintptr {
// //TODO- 	return Xreaddir(t, dir)
// //TODO- }
//
// func __syscall(r, _ uintptr, errno syscall.Errno) long {
// 	if errno != 0 {
// 		return long(-errno)
// 	}
//
// 	return long(r)
// }

func fcntlCmdStr(cmd int32) string {
	switch cmd {
	case fcntl.F_GETOWN:
		return "F_GETOWN"
	case fcntl.F_SETLK:
		return "F_SETLK"
	case fcntl.F_GETLK:
		return "F_GETLK"
	case fcntl.F_SETFD:
		return "F_SETFD"
	case fcntl.F_GETFD:
		return "F_GETFD"
	default:
		return fmt.Sprintf("cmd(%d)", cmd)
	}
}

// // struct __float2 { float __sinval; float __cosval; };
// // struct __double2 { double __sinval; double __cosval; };
// //
// // extern struct __float2 __sincosf_stret(float);
// // extern struct __double2 __sincos_stret(double);
// // extern struct __float2 __sincospif_stret(float);
// // extern struct __double2 __sincospi_stret(double);
//
// type X__float2 struct{ F__sinval, F__cosval float32 }
// type X__double2 struct{ F__sinval, F__cosval float32 }
//
// func X__sincosf_stret(*TLS, float32) X__float2 {
// 	panic(todo(""))
// }
//
// func X__sincos_stret(*TLS, float64) X__double2 {
// 	panic(todo(""))
// }
//
// func X__sincospif_stret(*TLS, float32) X__float2 {
// 	panic(todo(""))
// }
//
// func X__sincospi_stret(*TLS, float64) X__double2 {
// 	panic(todo(""))
// }

// ssize_t pread(int fd, void *buf, size_t count, off_t offset);
func Xpread(t *TLS, fd int32, buf uintptr, count types.Size_t, offset types.Off_t) types.Ssize_t {
	var n int
	var err error
	switch {
	case count == 0:
		n, err = unix.Pread(int(fd), nil, int64(offset))
	default:
		n, err = unix.Pread(int(fd), (*RawMem)(unsafe.Pointer(buf))[:count:count], int64(offset))
		if dmesgs && err == nil {
			dmesg("%v: fd %v, off %#x, count %#x, n %#x\n%s", origin(1), fd, offset, count, n, hex.Dump((*RawMem)(unsafe.Pointer(buf))[:n:n]))
		}
	}
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return types.Ssize_t(n)
}

// ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
func Xpwrite(t *TLS, fd int32, buf uintptr, count types.Size_t, offset types.Off_t) types.Ssize_t {
	var n int
	var err error
	switch {
	case count == 0:
		n, err = unix.Pwrite(int(fd), nil, int64(offset))
	default:
		n, err = unix.Pwrite(int(fd), (*RawMem)(unsafe.Pointer(buf))[:count:count], int64(offset))
		if dmesgs {
			dmesg("%v: fd %v, off %#x, count %#x\n%s", origin(1), fd, offset, count, hex.Dump((*RawMem)(unsafe.Pointer(buf))[:count:count]))
		}
	}
	if err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return types.Ssize_t(n)
}

// char***_NSGetEnviron()
func X_NSGetEnviron(t *TLS) uintptr {
	return EnvironP()
}

// int chflags(const char *path, u_int flags);
func Xchflags(t *TLS, path uintptr, flags uint32) int32 {
	if err := unix.Chflags(GoString(path), int(flags)); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// int rmdir(const char *pathname);
func Xrmdir(t *TLS, pathname uintptr) int32 {
	if err := unix.Rmdir(GoString(pathname)); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

func X__darwin_fd_set(...interface{}) {
	panic(todo(""))
}

func X__darwin_fd_clr(...interface{}) {
	panic(todo(""))
}

func X__darwin_fd_isset(...interface{}) int32 {
	panic(todo(""))
}

// uint64_t mach_absolute_time(void);
func Xmach_absolute_time(t *TLS) uint64 {
	return uint64(gotime.Now().UnixNano())
}

// See https://developer.apple.com/library/archive/qa/qa1398/_index.html
type machTimebaseInfo = struct {
	Fnumer uint32
	Fdenom uint32
} /* mach_time.h:36:1 */

// kern_return_t mach_timebase_info(mach_timebase_info_t info);
func Xmach_timebase_info(t *TLS, info uintptr) int32 {
	*(*machTimebaseInfo)(unsafe.Pointer(info)) = machTimebaseInfo{Fnumer: 1, Fdenom: 1}
	return 0
}

// int getattrlist(const char* path, struct attrlist * attrList, void * attrBuf, size_t attrBufSize, unsigned long options);
func Xgetattrlist(t *TLS, path, attrList, attrBuf uintptr, attrBufSize types.Size_t, options uint32) int32 {
	if _, _, err := unix.Syscall6(unix.SYS_GETATTRLIST, path, attrList, attrBuf, uintptr(attrBufSize), uintptr(options), 0); err != 0 { // Cannot avoid the syscall here.
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// int setattrlist(const char* path, struct attrlist * attrList, void * attrBuf, size_t attrBufSize, unsigned long options);
func Xsetattrlist(t *TLS, path, attrList, attrBuf uintptr, attrBufSize types.Size_t, options uint32) int32 {
	if _, _, err := unix.Syscall6(unix.SYS_SETATTRLIST, path, attrList, attrBuf, uintptr(attrBufSize), uintptr(options), 0); err != 0 { // Cannot avoid the syscall here.
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	return 0
}

// int copyfile(const char *from, const char *to, copyfile_state_t state, copyfile_flags_t flags);
func Xcopyfile(...interface{}) int32 {
	panic(todo(""))
}

// int truncate(const char *path, off_t length);
func Xtruncate(...interface{}) int32 {
	panic(todo(""))
}

type darwinDir struct {
	buf [4096]byte
	fd  int
	h   int
	l   int

	eof bool
}

// DIR *opendir(const char *name);
func Xopendir(t *TLS, name uintptr) uintptr {
	p := Xmalloc(t, uint64(unsafe.Sizeof(darwinDir{})))
	if p == 0 {
		panic("OOM")
	}

	fd := int(Xopen(t, name, fcntl.O_RDONLY|fcntl.O_DIRECTORY|fcntl.O_CLOEXEC, 0))
	if fd < 0 {
		if dmesgs {
			dmesg("%v: FAIL %v", origin(1), (*darwinDir)(unsafe.Pointer(p)).fd)
		}
		Xfree(t, p)
		// trc("==== opendir: %#x", 0)
		return 0
	}

	if dmesgs {
		dmesg("%v: ok", origin(1))
	}
	(*darwinDir)(unsafe.Pointer(p)).fd = fd
	(*darwinDir)(unsafe.Pointer(p)).h = 0
	(*darwinDir)(unsafe.Pointer(p)).l = 0
	(*darwinDir)(unsafe.Pointer(p)).eof = false
	// trc("==== opendir: %#x", p)
	return p
}

// struct dirent *readdir(DIR *dirp);
func Xreaddir(t *TLS, dir uintptr) uintptr {
	if (*darwinDir)(unsafe.Pointer(dir)).eof {
		return 0
	}

	// trc(".... readdir %#x: l %v, h %v", dir, (*darwinDir)(unsafe.Pointer(dir)).l, (*darwinDir)(unsafe.Pointer(dir)).h)
	if (*darwinDir)(unsafe.Pointer(dir)).l == (*darwinDir)(unsafe.Pointer(dir)).h {
		n, err := unix.Getdirentries((*darwinDir)(unsafe.Pointer(dir)).fd, (*darwinDir)(unsafe.Pointer(dir)).buf[:], nil)
		// trc("must read: %v %v", n, err)
		if n == 0 {
			if err != nil && err != io.EOF {
				if dmesgs {
					dmesg("%v: %v FAIL", origin(1), err)
				}
				t.setErrno(err)
			}
			(*darwinDir)(unsafe.Pointer(dir)).eof = true
			return 0
		}

		(*darwinDir)(unsafe.Pointer(dir)).l = 0
		(*darwinDir)(unsafe.Pointer(dir)).h = n
		// trc("new l %v, h %v", (*darwinDir)(unsafe.Pointer(dir)).l, (*darwinDir)(unsafe.Pointer(dir)).h)
	}
	de := dir + unsafe.Offsetof(darwinDir{}.buf) + uintptr((*darwinDir)(unsafe.Pointer(dir)).l)
	// trc("dir %#x de %#x", dir, de)
	(*darwinDir)(unsafe.Pointer(dir)).l += int((*unix.Dirent)(unsafe.Pointer(de)).Reclen)
	// trc("final l %v, h %v", (*darwinDir)(unsafe.Pointer(dir)).l, (*darwinDir)(unsafe.Pointer(dir)).h)
	return de
}

func Xclosedir(t *TLS, dir uintptr) int32 {
	// trc("---- closedir: %#x", dir)
	r := Xclose(t, int32((*darwinDir)(unsafe.Pointer(dir)).fd))
	Xfree(t, dir)
	return r
}

// int pipe(int pipefd[2]);
func Xpipe(t *TLS, pipefd uintptr) int32 {
	var a [2]int
	if err := syscall.Pipe(a[:]); err != nil {
		if dmesgs {
			dmesg("%v: %v FAIL", origin(1), err)
		}
		t.setErrno(err)
		return -1
	}

	*(*[2]int32)(unsafe.Pointer(pipefd)) = [2]int32{int32(a[0]), int32(a[1])}
	if dmesgs {
		dmesg("%v: %v ok", origin(1), a)
	}
	return 0
}

// int __isoc99_sscanf(const char *str, const char *format, ...);
func X__isoc99_sscanf(t *TLS, str, format, va uintptr) int32 {
	r := scanf(strings.NewReader(GoString(str)), format, va)
	// if dmesgs {
	// 	dmesg("%v: %q %q: %d", origin(1), GoString(str), GoString(format), r)
	// }
	return r
}

// int sscanf(const char *str, const char *format, ...);
func Xsscanf(t *TLS, str, format, va uintptr) int32 {
	r := scanf(strings.NewReader(GoString(str)), format, va)
	// if dmesgs {
	// 	dmesg("%v: %q %q: %d", origin(1), GoString(str), GoString(format), r)
	// }
	return r
}