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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.

package os

import (
        "errors"
        "syscall"
)

// SyscallError records an error from a specific system call.
type SyscallError struct {
        Syscall string
        Err     string
}

func (e *SyscallError) Error() string { return e.Syscall + ": " + e.Err }

// NewSyscallError returns, as an error, a new SyscallError
// with the given system call name and error details.
// As a convenience, if err is nil, NewSyscallError returns nil.
func NewSyscallError(syscall string, err error) error {
        if err == nil {
                return nil
        }
        return &SyscallError{syscall, err.Error()}
}

var (
        Eshortstat = errors.New("stat buffer too small")
        Ebadstat   = errors.New("malformed stat buffer")
        Ebadfd     = errors.New("fd out of range or not open")
        Ebadarg    = errors.New("bad arg in system call")
        Enotdir    = errors.New("not a directory")
        Enonexist  = errors.New("file does not exist")
        Eexist     = errors.New("file already exists")
        Eio        = errors.New("i/o error")
        Eperm      = errors.New("permission denied")

        EINVAL  = Ebadarg
        ENOTDIR = Enotdir
        ENOENT  = Enonexist
        EEXIST  = Eexist
        EIO     = Eio
        EACCES  = Eperm
        EPERM   = Eperm
        EISDIR  = syscall.EISDIR

        EBADF        = errors.New("bad file descriptor")
        ENAMETOOLONG = errors.New("file name too long")
        ERANGE       = errors.New("math result not representable")
        EPIPE        = errors.New("Broken Pipe")
        EPLAN9       = errors.New("not supported by plan 9")
)