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package sysfs
import (
"net"
"os"
experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
"github.com/tetratelabs/wazero/internal/fsapi"
socketapi "github.com/tetratelabs/wazero/internal/sock"
"github.com/tetratelabs/wazero/sys"
)
// NewTCPListenerFile creates a socketapi.TCPSock for a given *net.TCPListener.
func NewTCPListenerFile(tl *net.TCPListener) socketapi.TCPSock {
return newTCPListenerFile(tl)
}
// baseSockFile implements base behavior for all TCPSock, TCPConn files,
// regardless the platform.
type baseSockFile struct {
experimentalsys.UnimplementedFile
}
var _ experimentalsys.File = (*baseSockFile)(nil)
// IsDir implements the same method as documented on File.IsDir
func (*baseSockFile) IsDir() (bool, experimentalsys.Errno) {
// We need to override this method because WASI-libc prestats the FD
// and the default impl returns ENOSYS otherwise.
return false, 0
}
// Stat implements the same method as documented on File.Stat
func (f *baseSockFile) Stat() (fs sys.Stat_t, errno experimentalsys.Errno) {
// The mode is not really important, but it should be neither a regular file nor a directory.
fs.Mode = os.ModeIrregular
return
}
var _ socketapi.TCPSock = (*tcpListenerFile)(nil)
type tcpListenerFile struct {
baseSockFile
tl *net.TCPListener
closed bool
nonblock bool
}
// newTCPListenerFile is a constructor for a socketapi.TCPSock.
//
// The current strategy is to wrap a net.TCPListener
// and invoking raw syscalls using syscallConnControl:
// this internal calls RawConn.Control(func(fd)), making sure
// that the underlying file descriptor is valid throughout
// the duration of the syscall.
func newDefaultTCPListenerFile(tl *net.TCPListener) socketapi.TCPSock {
return &tcpListenerFile{tl: tl}
}
// Close implements the same method as documented on experimentalsys.File
func (f *tcpListenerFile) Close() experimentalsys.Errno {
if !f.closed {
return experimentalsys.UnwrapOSError(f.tl.Close())
}
return 0
}
// Addr is exposed for testing.
func (f *tcpListenerFile) Addr() *net.TCPAddr {
return f.tl.Addr().(*net.TCPAddr)
}
// IsNonblock implements the same method as documented on fsapi.File
func (f *tcpListenerFile) IsNonblock() bool {
return f.nonblock
}
// Poll implements the same method as documented on fsapi.File
func (f *tcpListenerFile) Poll(flag fsapi.Pflag, timeoutMillis int32) (ready bool, errno experimentalsys.Errno) {
return false, experimentalsys.ENOSYS
}
var _ socketapi.TCPConn = (*tcpConnFile)(nil)
type tcpConnFile struct {
baseSockFile
tc *net.TCPConn
// nonblock is true when the underlying connection is flagged as non-blocking.
// This ensures that reads and writes return experimentalsys.EAGAIN without blocking the caller.
nonblock bool
// closed is true when closed was called. This ensures proper experimentalsys.EBADF
closed bool
}
func newTcpConn(tc *net.TCPConn) socketapi.TCPConn {
return &tcpConnFile{tc: tc}
}
// Read implements the same method as documented on experimentalsys.File
func (f *tcpConnFile) Read(buf []byte) (n int, errno experimentalsys.Errno) {
if len(buf) == 0 {
return 0, 0 // Short-circuit 0-len reads.
}
if nonBlockingFileReadSupported && f.IsNonblock() {
n, errno = syscallConnControl(f.tc, func(fd uintptr) (int, experimentalsys.Errno) {
n, err := readSocket(fd, buf)
errno = experimentalsys.UnwrapOSError(err)
errno = fileError(f, f.closed, errno)
return n, errno
})
} else {
n, errno = read(f.tc, buf)
}
if errno != 0 {
// Defer validation overhead until we've already had an error.
errno = fileError(f, f.closed, errno)
}
return
}
// Write implements the same method as documented on experimentalsys.File
func (f *tcpConnFile) Write(buf []byte) (n int, errno experimentalsys.Errno) {
if nonBlockingFileWriteSupported && f.IsNonblock() {
return syscallConnControl(f.tc, func(fd uintptr) (int, experimentalsys.Errno) {
n, err := writeSocket(fd, buf)
errno = experimentalsys.UnwrapOSError(err)
errno = fileError(f, f.closed, errno)
return n, errno
})
} else {
n, errno = write(f.tc, buf)
}
if errno != 0 {
// Defer validation overhead until we've already had an error.
errno = fileError(f, f.closed, errno)
}
return
}
// Recvfrom implements the same method as documented on socketapi.TCPConn
func (f *tcpConnFile) Recvfrom(p []byte, flags int) (n int, errno experimentalsys.Errno) {
if flags != MSG_PEEK {
errno = experimentalsys.EINVAL
return
}
return syscallConnControl(f.tc, func(fd uintptr) (int, experimentalsys.Errno) {
n, err := recvfrom(fd, p, MSG_PEEK)
errno = experimentalsys.UnwrapOSError(err)
errno = fileError(f, f.closed, errno)
return n, errno
})
}
// Close implements the same method as documented on experimentalsys.File
func (f *tcpConnFile) Close() experimentalsys.Errno {
return f.close()
}
func (f *tcpConnFile) close() experimentalsys.Errno {
if f.closed {
return 0
}
f.closed = true
return f.Shutdown(socketapi.SHUT_RDWR)
}
// SetNonblock implements the same method as documented on fsapi.File
func (f *tcpConnFile) SetNonblock(enabled bool) (errno experimentalsys.Errno) {
f.nonblock = enabled
_, errno = syscallConnControl(f.tc, func(fd uintptr) (int, experimentalsys.Errno) {
return 0, experimentalsys.UnwrapOSError(setNonblockSocket(fd, enabled))
})
return
}
// IsNonblock implements the same method as documented on fsapi.File
func (f *tcpConnFile) IsNonblock() bool {
return f.nonblock
}
// Poll implements the same method as documented on fsapi.File
func (f *tcpConnFile) Poll(flag fsapi.Pflag, timeoutMillis int32) (ready bool, errno experimentalsys.Errno) {
return false, experimentalsys.ENOSYS
}
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