// Copyright 2009 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 arm,linux

package unix

import (

	"syscall"

	"unsafe"

)

func setTimespec(sec, nsec int64) Timespec {

	return Timespec{Sec: int32(sec), Nsec: int32(nsec)}

}

func setTimeval(sec, usec int64) Timeval {

	return Timeval{Sec: int32(sec), Usec: int32(usec)}

}

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

func Pipe(p []int) (err error) {

	if len(p) != 2 {

		return EINVAL

	}

	var pp [2]_C_int

	// Try pipe2 first for Android O, then try pipe for kernel 2.6.23.

	err = pipe2(&pp, 0)

	if err == ENOSYS {

		err = pipe(&pp)

	}

	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

}

// Underlying system call writes to newoffset via pointer.

// Implemented in assembly to avoid allocation.

func seek(fd int, offset int64, whence int) (newoffset int64, err syscall.Errno)

func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {

	newoffset, errno := seek(fd, offset, whence)

	if errno != 0 {

		return 0, errno

	}

	return newoffset, nil

}

//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) = SYS_GETGROUPS32

//sysnb	setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32

//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	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)

//sysnb	socketpair(domain int, typ int, flags int, fd *[2]int32) (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)

// 64-bit file system and 32-bit uid calls

// (16-bit uid calls are not always supported in newer kernels)

//sys	Dup2(oldfd int, newfd int) (err error)

//sysnb	EpollCreate(size int) (fd int, err error)

//sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)

//sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32

//sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64

//sys	Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64

//sysnb	Getegid() (egid int) = SYS_GETEGID32

//sysnb	Geteuid() (euid int) = SYS_GETEUID32

//sysnb	Getgid() (gid int) = SYS_GETGID32

//sysnb	Getuid() (uid int) = SYS_GETUID32

//sysnb	InotifyInit() (fd int, err error)

//sys	Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32

//sys	Listen(s int, n int) (err error)

//sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64

//sys	Pause() (err error)

//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)

//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64

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

//sys	setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32

//sys	setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32

//sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID32

//sysnb	Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32

//sysnb	Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32

//sysnb	Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32

//sys	Shutdown(fd int, how int) (err error)

//sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)

//sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64

//sys	Ustat(dev int, ubuf *Ustat_t) (err error)

//sys	futimesat(dirfd int, path string, times *[2]Timeval) (err error)

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

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)

}

//sys	utimes(path string, times *[2]Timeval) (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	Truncate(path string, length int64) (err error) = SYS_TRUNCATE64

//sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64

func Fadvise(fd int, offset int64, length int64, advice int) (err error) {

	_, _, e1 := Syscall6(SYS_ARM_FADVISE64_64, uintptr(fd), uintptr(advice), uintptr(offset), uintptr(offset>>32), uintptr(length), uintptr(length>>32))

	if e1 != 0 {

		err = errnoErr(e1)

	}

	return

}

//sys	mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)

func Fstatfs(fd int, buf *Statfs_t) (err error) {

	_, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))

	if e != 0 {

		err = e

	}

	return

}

func Statfs(path string, buf *Statfs_t) (err error) {

	pathp, err := BytePtrFromString(path)

	if err != nil {

		return err

	}

	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))

	if e != 0 {

		err = e

	}

	return

}

func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {

	page := uintptr(offset / 4096)

	if offset != int64(page)*4096 {

		return 0, EINVAL

	}

	return mmap2(addr, length, prot, flags, fd, page)

}

type rlimit32 struct {

	Cur uint32

	Max uint32

}

//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_UGETRLIMIT

const rlimInf32 = ^uint32(0)

const rlimInf64 = ^uint64(0)

func Getrlimit(resource int, rlim *Rlimit) (err error) {

	err = prlimit(0, resource, nil, rlim)

	if err != ENOSYS {

		return err

	}

	rl := rlimit32{}

	err = getrlimit(resource, &rl)

	if err != nil {

		return

	}

	if rl.Cur == rlimInf32 {

		rlim.Cur = rlimInf64

	} else {

		rlim.Cur = uint64(rl.Cur)

	}

	if rl.Max == rlimInf32 {

		rlim.Max = rlimInf64

	} else {

		rlim.Max = uint64(rl.Max)

	}

	return

}

//sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT

func Setrlimit(resource int, rlim *Rlimit) (err error) {

	err = prlimit(0, resource, rlim, nil)

	if err != ENOSYS {

		return err

	}

	rl := rlimit32{}

	if rlim.Cur == rlimInf64 {

		rl.Cur = rlimInf32

	} else if rlim.Cur < uint64(rlimInf32) {

		rl.Cur = uint32(rlim.Cur)

	} else {

		return EINVAL

	}

	if rlim.Max == rlimInf64 {

		rl.Max = rlimInf32

	} else if rlim.Max < uint64(rlimInf32) {

		rl.Max = uint32(rlim.Max)

	} else {

		return EINVAL

	}

	return setrlimit(resource, &rl)

}

func (r *PtraceRegs) PC() uint64 { return uint64(r.Uregs[15]) }

func (r *PtraceRegs) SetPC(pc uint64) { r.Uregs[15] = uint32(pc) }

func (iov *Iovec) SetLen(length int) {

	iov.Len = uint32(length)

}

func (msghdr *Msghdr) SetControllen(length int) {

	msghdr.Controllen = uint32(length)

}

func (msghdr *Msghdr) SetIovlen(length int) {

	msghdr.Iovlen = uint32(length)

}

func (cmsg *Cmsghdr) SetLen(length int) {

	cmsg.Len = uint32(length)

}

//sys	poll(fds *PollFd, nfds int, timeout int) (n int, err error)

func Poll(fds []PollFd, timeout int) (n int, err error) {

	if len(fds) == 0 {

		return poll(nil, 0, timeout)

	}

	return poll(&fds[0], len(fds), timeout)

}

//sys	armSyncFileRange(fd int, flags int, off int64, n int64) (err error) = SYS_ARM_SYNC_FILE_RANGE

func SyncFileRange(fd int, off int64, n int64, flags int) error {

	// The sync_file_range and arm_sync_file_range syscalls differ only in the

	// order of their arguments.

	return armSyncFileRange(fd, flags, off, n)

}

//sys	kexecFileLoad(kernelFd int, initrdFd int, cmdlineLen int, cmdline string, flags int) (err error)

func KexecFileLoad(kernelFd int, initrdFd int, cmdline string, flags int) error {

	cmdlineLen := len(cmdline)

	if cmdlineLen > 0 {

		// Account for the additional NULL byte added by

		// BytePtrFromString in kexecFileLoad. The kexec_file_load

		// syscall expects a NULL-terminated string.

		cmdlineLen++

	}

	return kexecFileLoad(kernelFd, initrdFd, cmdlineLen, cmdline, flags)

}