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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.

// +build darwin freebsd linux netbsd openbsd windows

package os

import syscall "syscall"

// Commonly known Unix errors.
var (
        EPERM        error = syscall.EPERM
        ENOENT       error = syscall.ENOENT
        ESRCH        error = syscall.ESRCH
        EINTR        error = syscall.EINTR
        EIO          error = syscall.EIO
        ENXIO        error = syscall.ENXIO
        E2BIG        error = syscall.E2BIG
        ENOEXEC      error = syscall.ENOEXEC
        EBADF        error = syscall.EBADF
        ECHILD       error = syscall.ECHILD
        EDEADLK      error = syscall.EDEADLK
        ENOMEM       error = syscall.ENOMEM
        EACCES       error = syscall.EACCES
        EFAULT       error = syscall.EFAULT
        EBUSY        error = syscall.EBUSY
        EEXIST       error = syscall.EEXIST
        EXDEV        error = syscall.EXDEV
        ENODEV       error = syscall.ENODEV
        ENOTDIR      error = syscall.ENOTDIR
        EISDIR       error = syscall.EISDIR
        EINVAL       error = syscall.EINVAL
        ENFILE       error = syscall.ENFILE
        EMFILE       error = syscall.EMFILE
        ENOTTY       error = syscall.ENOTTY
        EFBIG        error = syscall.EFBIG
        ENOSPC       error = syscall.ENOSPC
        ESPIPE       error = syscall.ESPIPE
        EROFS        error = syscall.EROFS
        EMLINK       error = syscall.EMLINK
        EPIPE        error = syscall.EPIPE
        EAGAIN       error = syscall.EAGAIN
        EDOM         error = syscall.EDOM
        ERANGE       error = syscall.ERANGE
        EADDRINUSE   error = syscall.EADDRINUSE
        ECONNREFUSED error = syscall.ECONNREFUSED
        ENAMETOOLONG error = syscall.ENAMETOOLONG
        EAFNOSUPPORT error = syscall.EAFNOSUPPORT
        ETIMEDOUT    error = syscall.ETIMEDOUT
        ENOTCONN     error = syscall.ENOTCONN
)

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

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

// 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}
}