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// Copyright 2011 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.

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

package syscall

import "unsafe"

/*
 * Wrapped
 */

//sysnb pipe(p *[2]int) (err error)
//pipe(p *[2]int) int
func Pipe(p []int) (err error) {
        if len(p) != 2 {
                return EINVAL
        }
        var pp [2]int
        err = pipe(&pp)
        p[0] = pp[0]
        p[1] = pp[1]
        return
}

//sys   utimes(path string, times *[2]Timeval) (err error)
//utimes(path *byte, times *[2]Timeval) int
func Utimes(path string, tv []Timeval) (err error) {
        if len(tv) != 2 {
                return EINVAL
        }
        return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
}

//sys   getcwd(buf *byte, size Size_t) (err error)
//getcwd(buf *byte, size Size_t) *byte

const ImplementsGetwd = true

func Getwd() (ret string, err error) {
        for len := Size_t(4096); ; len *= 2 {
                b := make([]byte, len)
                err := getcwd(&b[0], len)
                if err == nil {
                        i := 0
                        for b[i] != 0 {
                                i++
                        }
                        return string(b[0:i]), nil
                }
                if err != ERANGE {
                        return "", err
                }
        }
}

//sysnb getgroups(size int, list *Gid_t) (nn int, err error)
//getgroups(size int, list *Gid_t) int

func Getgroups() (gids []int, err error) {
        n, err := getgroups(0, nil)
        if err != nil {
                return nil, err
        }
        if n == 0 {
                return nil, nil
        }

        // Sanity check group count.  Max is 1<<16 on GNU/Linux.
        if n < 0 || n > 1<<20 {
                return nil, EINVAL
        }

        a := make([]Gid_t, n)
        n, err = getgroups(n, &a[0])
        if err != nil {
                return nil, err
        }
        gids = make([]int, n)
        for i, v := range a[0:n] {
                gids[i] = int(v)
        }
        return
}

//sysnb setgroups(n int, list *Gid_t) (err error)
//setgroups(n Size_t, list *Gid_t) int

func Setgroups(gids []int) (err error) {
        if len(gids) == 0 {
                return setgroups(0, nil)
        }

        a := make([]Gid_t, len(gids))
        for i, v := range gids {
                a[i] = Gid_t(v)
        }
        return setgroups(len(a), &a[0])
}

type WaitStatus uint32

// The WaitStatus methods are implemented in C, to pick up the macros
// #defines in <sys/wait.h>.

func (w WaitStatus) Exited() bool
func (w WaitStatus) Signaled() bool
func (w WaitStatus) Stopped() bool
func (w WaitStatus) Continued() bool
func (w WaitStatus) CoreDump() bool
func (w WaitStatus) ExitStatus() int
func (w WaitStatus) Signal() int
func (w WaitStatus) StopSignal() int
func (w WaitStatus) TrapCause() int

//sys   Mkfifo(path string, mode uint32) (err error)
//mkfifo(path *byte, mode Mode_t) int

//sys   Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
//select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) int

const nfdbits = unsafe.Sizeof(fds_bits_type) * 8

type FdSet struct {
        Bits [(FD_SETSIZE + nfdbits - 1) / nfdbits]fds_bits_type
}

func FDSet(fd int, set *FdSet) {
        set.Bits[fd/nfdbits] |= (1 << (uint)(fd%nfdbits))
}

func FDClr(fd int, set *FdSet) {
        set.Bits[fd/nfdbits] &^= (1 << (uint)(fd%nfdbits))
}

func FDIsSet(fd int, set *FdSet) bool {
        if set.Bits[fd/nfdbits]&(1<<(uint)(fd%nfdbits)) != 0 {
                return true
        } else {
                return false
        }
}

func FDZero(set *FdSet) {
        for i := range set.Bits {
                set.Bits[i] = 0
        }
}

//sys   Access(path string, mode uint32) (err error)
//access(path *byte, mode int) int

//sys   Chdir(path string) (err error)
//chdir(path *byte) int

//sys   Chmod(path string, mode uint32) (err error)
//chmod(path *byte, mode Mode_t) int

//sys   Chown(path string, uid int, gid int) (err error)
//chown(path *byte, uid Uid_t, gid Gid_t) int

//sys   Chroot(path string) (err error)
//chroot(path *byte) int

//sys   Close(fd int) (err error)
//close(fd int) int

//sys   Creat(path string, mode uint32) (fd int, err error)
//creat(path *byte, mode Mode_t) int

//sysnb Dup(oldfd int) (fd int, err error)
//dup(oldfd int) int

//sysnb Dup2(oldfd int, newfd int) (err error)
//dup2(oldfd int, newfd int) int

//sys   Exit(code int)
//exit(code int)

//sys   Fchdir(fd int) (err error)
//fchdir(fd int) int

//sys   Fchmod(fd int, mode uint32) (err error)
//fchmod(fd int, mode Mode_t) int

//sys   Fchown(fd int, uid int, gid int) (err error)
//fchown(fd int, uid Uid_t, gid Gid_t) int

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

//sys   Fdatasync(fd int) (err error)
//fdatasync(fd int) int

//sys   Fsync(fd int) (err error)
//fsync(fd int) int

//sysnb Getegid() (egid int)
//getegid() Gid_t

//sysnb Geteuid() (euid int)
//geteuid() Uid_t

//sysnb Getgid() (gid int)
//getgid() Gid_t

//sysnb Getpagesize() (pagesize int)
//getpagesize() int

//sysnb Getpgid(pid int) (pgid int, err error)
//getpgid(pid Pid_t) Pid_t

//sysnb Getpgrp() (pid int)
//getpgrp() Pid_t

//sysnb Getpid() (pid int)
//getpid() Pid_t

//sysnb Getppid() (ppid int)
//getppid() Pid_t

// FIXME: mksysinfo Rlimit
// //sysnb      Getrlimit(resource int, rlim *Rlimit) (err error)
// //getrlimit(resource int, rlim *Rlimit) int

//sysnb Getrusage(who int, rusage *Rusage) (err error)
//getrusage(who int, rusage *Rusage) int

//sysnb gettimeofday(tv *Timeval, tz *byte) (err error)
//gettimeofday(tv *Timeval, tz *byte) int
func Gettimeofday(tv *Timeval) (err error) {
        return gettimeofday(tv, nil)
}

//sysnb Getuid() (uid int)
//getuid() Uid_t

//sysnb Kill(pid int, sig int) (err error)
//kill(pid Pid_t, sig int) int

//sys   Lchown(path string, uid int, gid int) (err error)
//lchown(path *byte, uid Uid_t, gid Gid_t) int

//sys   Link(oldpath string, newpath string) (err error)
//link(oldpath *byte, newpath *byte) int

//sys   Mkdir(path string, mode uint32) (err error)
//mkdir(path *byte, mode Mode_t) int

//sys   Mknod(path string, mode uint32, dev int) (err error)
//mknod(path *byte, mode Mode_t, dev _dev_t) int

//sys   Mount(source string, target string, fstype string, flags int, data string) (err error)
//mount(source *byte, target *byte, fstype *byte, flags _C_long, data *byte) int

//sys   Nanosleep(time *Timespec, leftover *Timespec) (err error)
//nanosleep(time *Timespec, leftover *Timespec) int

//sys   Pause() (err error)
//pause() int

//sys   Read(fd int, p []byte) (n int, err error)
//read(fd int, buf *byte, count Size_t) Ssize_t

//sys   Readlink(path string, buf []byte) (n int, err error)
//readlink(path *byte, buf *byte, bufsiz Size_t) Ssize_t

//sys   Rename(oldpath string, newpath string) (err error)
//rename(oldpath *byte, newpath *byte) int

//sys   Rmdir(path string) (err error)
//rmdir(path *byte) int

//sys   Setdomainname(p []byte) (err error)
//setdomainname(name *byte, len Size_t) int

//sys   Sethostname(p []byte) (err error)
//sethostname(name *byte, len Size_t) int

//sysnb Setgid(gid int) (err error)
//setgid(gid Gid_t) int

//sysnb Setregid(rgid int, egid int) (err error)
//setregid(rgid Gid_t, egid Gid_t) int

//sysnb Setpgid(pid int, pgid int) (err error)
//setpgid(pid Pid_t, pgid Pid_t) int

//sysnb Setreuid(ruid int, euid int) (err error)
//setreuid(ruid Uid_t, euid Uid_t) int

// FIXME: mksysinfo Rlimit
// //sysnb      Setrlimit(resource int, rlim *Rlimit) (err error)
// //setrlimit(resource int, rlim *Rlimit) int

//sysnb Setsid() (pid int, err error)
//setsid() Pid_t

//sysnb settimeofday(tv *Timeval, tz *byte) (err error)
//settimeofday(tv *Timeval, tz *byte) int

func Settimeofday(tv *Timeval) (err error) {
        return settimeofday(tv, nil)
}

//sysnb Setuid(uid int) (err error)
//setuid(uid Uid_t) int

//sys   Symlink(oldpath string, newpath string) (err error)
//symlink(oldpath *byte, newpath *byte) int

//sys   Sync()
//sync()

// FIXME: mksysinfo Time_t
// //sysnb      Time(t *Time_t) (tt Time_t, err error)
// //time(t *Time_t) Time_t

//sysnb Times(tms *Tms) (ticks uintptr, err error)
//times(tms *Tms) _clock_t

//sysnb Umask(mask int) (oldmask int)
//umask(mask Mode_t) Mode_t

//sys   Unlink(path string) (err error)
//unlink(path *byte) int

// FIXME: mksysinfo Utimbuf
// //sys        Utime(path string, buf *Utimbuf) (err error)
// //utime(path *byte, buf *Utimbuf) int

//sys   Write(fd int, p []byte) (n int, err error)
//write(fd int, buf *byte, count Size_t) Ssize_t

//sys   munmap(addr uintptr, length uintptr) (err error)
//munmap(addr *byte, length Size_t) int

//sys Madvise(b []byte, advice int) (err error)
//madvise(addr *byte, len Size_t, advice int) int

//sys   Mprotect(b []byte, prot int) (err error)
//mprotect(addr *byte, len Size_t, prot int) int

//sys   Mlock(b []byte) (err error)
//mlock(addr *byte, len Size_t) int

//sys   Munlock(b []byte) (err error)
//munlock(addr *byte, len Size_t) int

//sys   Mlockall(flags int) (err error)
//mlockall(flags int) int

//sys   Munlockall() (err error)
//munlockall() int

func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }

func NsecToTimespec(nsec int64) (ts Timespec) {
        ts.Sec = Timespec_sec_t(nsec / 1e9)
        ts.Nsec = Timespec_nsec_t(nsec % 1e9)
        return
}

func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 }

func NsecToTimeval(nsec int64) (tv Timeval) {
        nsec += 999 // round up to microsecond
        tv.Sec = Timeval_sec_t(nsec / 1e9)
        tv.Usec = Timeval_usec_t(nsec % 1e9 / 1e3)
        return
}

//sysnb Tcgetattr(fd int, p *Termios) (err error)
//tcgetattr(fd int, p *Termios) int

//sys   Tcsetattr(fd int, actions int, p *Termios) (err error)
//tcsetattr(fd int, actions int, p *Termios) int