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// 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.

// GNU/Linux library calls.

package syscall

import "unsafe"

//sys   Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
//openat(dirfd int, path *byte, flags int, mode Mode_t) int

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

func Futimes(fd int, tv []Timeval) (err error) {
        // Believe it or not, this is the best we can do on GNU/Linux
        // (and is what glibc does).
        return Utimes("/proc/self/fd/"+itoa(fd), tv)
}

//sys   ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
//ptrace(request int, pid Pid_t, addr *byte, data *byte) _C_long

//sysnb raw_ptrace(request int, pid int, addr *byte, data *byte) (err Errno)
//ptrace(request int, pid Pid_t, addr *byte, data *byte) _C_long

func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) {
        // The peek requests are machine-size oriented, so we wrap it
        // to retrieve arbitrary-length data.

        // The ptrace syscall differs from glibc's ptrace.
        // Peeks returns the word in *data, not as the return value.

        var buf [sizeofPtr]byte

        // Leading edge.  PEEKTEXT/PEEKDATA don't require aligned
        // access (PEEKUSER warns that it might), but if we don't
        // align our reads, we might straddle an unmapped page
        // boundary and not get the bytes leading up to the page
        // boundary.
        n := 0
        if addr%sizeofPtr != 0 {
                err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
                if err != nil {
                        return 0, err
                }
                n += copy(out, buf[addr%sizeofPtr:])
                out = out[n:]
        }

        // Remainder.
        for len(out) > 0 {
                // We use an internal buffer to gaurantee alignment.
                // It's not documented if this is necessary, but we're paranoid.
                err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
                if err != nil {
                        return n, err
                }
                copied := copy(out, buf[0:])
                n += copied
                out = out[copied:]
        }

        return n, nil
}

func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
        return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
}

func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
        return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
}

func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
        // As for ptracePeek, we need to align our accesses to deal
        // with the possibility of straddling an invalid page.

        // Leading edge.
        n := 0
        if addr%sizeofPtr != 0 {
                var buf [sizeofPtr]byte
                err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
                if err != nil {
                        return 0, err
                }
                n += copy(buf[addr%sizeofPtr:], data)
                word := *((*uintptr)(unsafe.Pointer(&buf[0])))
                err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word)
                if err != nil {
                        return 0, err
                }
                data = data[n:]
        }

        // Interior.
        for len(data) > int(sizeofPtr) {
                word := *((*uintptr)(unsafe.Pointer(&data[0])))
                err = ptrace(pokeReq, pid, addr+uintptr(n), word)
                if err != nil {
                        return n, err
                }
                n += int(sizeofPtr)
                data = data[sizeofPtr:]
        }

        // Trailing edge.
        if len(data) > 0 {
                var buf [sizeofPtr]byte
                err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
                if err != nil {
                        return n, err
                }
                copy(buf[0:], data)
                word := *((*uintptr)(unsafe.Pointer(&buf[0])))
                err = ptrace(pokeReq, pid, addr+uintptr(n), word)
                if err != nil {
                        return n, err
                }
                n += len(data)
        }

        return n, nil
}

func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
        return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
}

func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
        return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
}

func PtraceSetOptions(pid int, options int) (err error) {
        return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
}

func PtraceGetEventMsg(pid int) (msg uint, err error) {
        var data _C_long
        err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data)))
        msg = uint(data)
        return
}

func PtraceCont(pid int, signal int) (err error) {
        return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
}

func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }

func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) }

func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) }

// FIXME: mksysinfo needs to produce LINUX_REBOOT_MAGIC[12].

// //sys        reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error)
// //reboot(magic1 uint, magic2 uint, cmd int, arg *byte) int
// func Reboot(cmd int) (err error) {
//      return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "")
// }

//sys   Acct(path string) (err error)
//acct(path *byte) int

// FIXME: mksysinfo Timex
// //sys        Adjtimex(buf *Timex) (state int, err error)
// //adjtimex(buf *Timex) int

//sys   Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
//faccessat(dirfd int, pathname *byte, mode int, flags int) int

//sys   Fallocate(fd int, mode uint32, off int64, len int64) (err error)
//fallocate(fd int, mode int, offset Offset_t, len Offset_t) int

//sys   Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
//fchmodat(dirfd int, pathname *byte, mode Mode_t, flags int) int

//sys   Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
//fchownat(dirfd int, path *byte, owner Uid_t, group Gid_t, flags int) int

//sys   Flock(fd int, how int) (err error)
//flock(fd int, how int) int

//sys   Fstatfs(fd int, buf *Statfs_t) (err error)
//fstatfs(fd int, buf *Statfs_t) int

func Gettid() (tid int) {
        r1, _, _ := Syscall(SYS_GETTID, 0, 0, 0)
        return int(r1)
}

// FIXME: mksysinfo linux_dirent
//    Or just abandon this function.
// //sys        Getdents(fd int, buf []byte) (n int, err error)
// //getdents64(fd int, buf *byte, count uint)

//sys   InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)
//inotify_add_watch(fd int, pathname *byte, mask uint32) int

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

// FIXME: Only in glibc 2.9 and later.
// //sysnb      InotifyInit1(flags int) (fd int, err error)
// //inotify_init1(flags int) int

//sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error)
//inotify_rm_watch(fd int, wd uint32) int

//sys   Klogctl(typ int, buf []byte) (n int, err error)
//klogctl(typ int, bufp *byte, len int) int

//sys   Mkdirat(dirfd int, path string, mode uint32) (err error)
//mkdirat(dirfd int, path *byte, mode Mode_t) int

//sys   Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
//mknodat(dirfd int, path *byte, mode Mode_t, dev _dev_t) int

//sys   PivotRoot(newroot string, putold string) (err error)
//pivot_root(newroot *byte, putold *byte) int

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

//sys   sendfile(outfd int, infd int, offset *Offset_t, count int) (written int, err error)
//sendfile64(outfd int, infd int, offset *Offset_t, count Size_t) Ssize_t
func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
        var soff Offset_t
        var psoff *Offset_t
        if offset != nil {
                psoff = &soff
        }
        written, err = sendfile(outfd, infd, psoff, count)
        if offset != nil {
                *offset = int64(soff)
        }
        return
}

//sys   Setfsgid(gid int) (err error)
//setfsgid(gid Gid_t) int

//sys   Setfsuid(uid int) (err error)
//setfsuid(uid Uid_t) int

//sysnb Setresgid(rgid int, egid int, sgid int) (err error)
//setresgid(rgid Gid_t, egid Gid_t, sgid Gid_t) int

//sysnb Setresuid(ruid int, eguid int, suid int) (err error)
//setresuid(ruid Uid_t, euid Uid_t, suid Uid_t) int

//sys   splice(rfd int, roff *_loff_t, wfd int, woff *_loff_t, len int, flags int) (n int64, err error)
//splice(rfd int, roff *_loff_t, wfd int, woff *_loff_t, len Size_t, flags uint) Ssize_t
func Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error) {
        var lroff _loff_t
        var plroff *_loff_t
        if roff != nil {
                plroff = &lroff
        }
        var lwoff _loff_t
        var plwoff *_loff_t
        if woff != nil {
                plwoff = &lwoff
        }
        n, err = splice(rfd, plroff, wfd, plwoff, len, flags)
        if roff != nil {
                *roff = int64(lroff)
        }
        if woff != nil {
                *woff = int64(lwoff)
        }
        return
}

//sys   Statfs(path string, buf *Statfs_t) (err error)
//statfs(path *byte, buf *Statfs_t) int

// FIXME: Only in glibc 2.6 and later.
// //sys        SyncFileRange(fd int, off int64, n int64, flags int) (err error)
// //sync_file_range(fd int, off Offset_t, n Offset_t, flags uint) int

// FIXME: mksysinfo Sysinfo_t
// //sysnb      Sysinfo(info *Sysinfo_t) (err error)
// //sysinfo(info *Sysinfo_t) int

//sys   Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
//tee(rfd int, wfd int, len Size_t, flags uint) Ssize_t

// FIXME: Only available as a syscall.
// //sysnb      Tgkill(tgid int, tid int, sig int) (err error)
// //tgkill(tgid int, tid int, sig int) int

//sys   unlinkat(dirfd int, path string, flags int) (err error)
//unlinkat(dirfd int, path *byte, flags int) int

func Unlinkat(dirfd int, path string) (err error) {
        return unlinkat(dirfd, path, 0)
}

//sys   Unmount(target string, flags int) (err error) = SYS_UMOUNT2
//umount2(target *byte, flags int) int

//sys   Unshare(flags int) (err error)
//unshare(flags int) int

// FIXME: mksysinfo Ustat_t
// //sys        Ustat(dev int, ubuf *Ustat_t) (err error)
// //ustat(dev _dev_t, ubuf *Ustat_t) int