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// Copyright 2018 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.

// +build riscv64,linux

package unix

import "unsafe"

func EpollCreate(size int) (fd int, err error) {
    if size <= 0 {
        return -1, EINVAL
    }
    return EpollCreate1(0)
}

//sys   EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
//sys   Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64
//sys   Fchown(fd int, uid int, gid int) (err error)
//sys   Fstat(fd int, stat *Stat_t) (err error)
//sys   Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
//sys   Fstatfs(fd int, buf *Statfs_t) (err error)
//sys   Ftruncate(fd int, length int64) (err error)
//sysnb Getegid() (egid int)
//sysnb Geteuid() (euid int)
//sysnb Getgid() (gid int)
//sysnb Getrlimit(resource int, rlim *Rlimit) (err error)
//sysnb Getuid() (uid int)
//sys   Listen(s int, n int) (err error)
//sys   Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
//sys   Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
//sys   Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK

func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) {
    var ts *Timespec
    if timeout != nil {
        ts = &Timespec{Sec: timeout.Sec, Nsec: timeout.Usec * 1000}
    }
    return Pselect(nfd, r, w, e, ts, nil)
}

//sys   sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
//sys   Setfsgid(gid int) (err error)
//sys   Setfsuid(uid int) (err error)
//sysnb Setregid(rgid int, egid int) (err error)
//sysnb Setresgid(rgid int, egid int, sgid int) (err error)
//sysnb Setresuid(ruid int, euid int, suid int) (err error)
//sysnb Setrlimit(resource int, rlim *Rlimit) (err error)
//sysnb Setreuid(ruid int, euid int) (err error)
//sys   Shutdown(fd int, how int) (err error)
//sys   Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)

func Stat(path string, stat *Stat_t) (err error) {
    return Fstatat(AT_FDCWD, path, stat, 0)
}

func Lchown(path string, uid int, gid int) (err error) {
    return Fchownat(AT_FDCWD, path, uid, gid, AT_SYMLINK_NOFOLLOW)
}

func Lstat(path string, stat *Stat_t) (err error) {
    return Fstatat(AT_FDCWD, path, stat, AT_SYMLINK_NOFOLLOW)
}

//sys   Statfs(path string, buf *Statfs_t) (err error)
//sys   SyncFileRange(fd int, off int64, n int64, flags int) (err error)
//sys   Truncate(path string, length int64) (err error)

func Ustat(dev int, ubuf *Ustat_t) (err error) {
    return ENOSYS
}

//sys   accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
//sys   accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
//sys   bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
//sys   connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
//sysnb getgroups(n int, list *_Gid_t) (nn int, err error)
//sysnb setgroups(n int, list *_Gid_t) (err error)
//sys   getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
//sys   setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
//sysnb socket(domain int, typ int, proto int) (fd int, err error)
//sysnb socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
//sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sys   recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
//sys   sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
//sys   recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
//sys   sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
//sys   mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)

//sysnb Gettimeofday(tv *Timeval) (err error)

func setTimespec(sec, nsec int64) Timespec {
    return Timespec{Sec: sec, Nsec: nsec}
}

func setTimeval(sec, usec int64) Timeval {
    return Timeval{Sec: sec, Usec: usec}
}

func futimesat(dirfd int, path string, tv *[2]Timeval) (err error) {
    if tv == nil {
        return utimensat(dirfd, path, nil, 0)
    }

    ts := []Timespec{
        NsecToTimespec(TimevalToNsec(tv[0])),
        NsecToTimespec(TimevalToNsec(tv[1])),
    }
    return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
}

func Time(t *Time_t) (Time_t, error) {
    var tv Timeval
    err := Gettimeofday(&tv)
    if err != nil {
        return 0, err
    }
    if t != nil {
        *t = Time_t(tv.Sec)
    }
    return Time_t(tv.Sec), nil
}

func Utime(path string, buf *Utimbuf) error {
    tv := []Timeval{
        {Sec: buf.Actime},
        {Sec: buf.Modtime},
    }
    return Utimes(path, tv)
}

func utimes(path string, tv *[2]Timeval) (err error) {
    if tv == nil {
        return utimensat(AT_FDCWD, path, nil, 0)
    }

    ts := []Timespec{
        NsecToTimespec(TimevalToNsec(tv[0])),
        NsecToTimespec(TimevalToNsec(tv[1])),
    }
    return utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
}

func Pipe(p []int) (err error) {
    if len(p) != 2 {
        return EINVAL
    }
    var pp [2]_C_int
    err = pipe2(&pp, 0)
    p[0] = int(pp[0])
    p[1] = int(pp[1])
    return
}

//sysnb pipe2(p *[2]_C_int, flags int) (err error)

func Pipe2(p []int, flags int) (err error) {
    if len(p) != 2 {
        return EINVAL
    }
    var pp [2]_C_int
    err = pipe2(&pp, flags)
    p[0] = int(pp[0])
    p[1] = int(pp[1])
    return
}

func (r *PtraceRegs) PC() uint64 { return r.Pc }

func (r *PtraceRegs) SetPC(pc uint64) { r.Pc = pc }

func (iov *Iovec) SetLen(length int) {
    iov.Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
    msghdr.Controllen = uint64(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
    cmsg.Len = uint64(length)
}

func InotifyInit() (fd int, err error) {
    return InotifyInit1(0)
}

func Dup2(oldfd int, newfd int) (err error) {
    return Dup3(oldfd, newfd, 0)
}

func Pause() error {
    _, err := ppoll(nil, 0, nil, nil)
    return err
}

func Poll(fds []PollFd, timeout int) (n int, err error) {
    var ts *Timespec
    if timeout >= 0 {
        ts = new(Timespec)
        *ts = NsecToTimespec(int64(timeout) * 1e6)
    }
    if len(fds) == 0 {
        return ppoll(nil, 0, ts, nil)
    }
    return ppoll(&fds[0], len(fds), ts, nil)
}

func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) {
    return Renameat2(olddirfd, oldpath, newdirfd, newpath, 0)
}