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libc/winsup/cygwin/fhandler_serial.cc

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/* fhandler_serial.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
#include "sigproc.h"
#include "pinfo.h"
#include <sys/termios.h>
/**********************************************************************/
/* fhandler_serial */
fhandler_serial::fhandler_serial (int unit)
: fhandler_base (FH_SERIAL, unit), vmin_ (0), vtime_ (0), pgrp_ (myself->pgid)
{
set_need_fork_fixup ();
}
void
fhandler_serial::overlapped_setup ()
{
memset (&io_status, 0, sizeof (io_status));
io_status.hEvent = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
ProtectHandle (io_status.hEvent);
overlapped_armed = 0;
}
int
fhandler_serial::raw_read (void *ptr, size_t ulen)
{
int tot;
DWORD n;
HANDLE w4[2];
DWORD minchars = vmin_ ?: ulen;
w4[0] = io_status.hEvent;
w4[1] = signal_arrived;
debug_printf ("ulen %d, vmin_ %d, vtime_ %d, hEvent %p", ulen, vmin_, vtime_,
io_status.hEvent);
if (!overlapped_armed)
{
(void) SetCommMask (get_handle (), EV_RXCHAR);
ResetEvent (io_status.hEvent);
}
for (n = 0, tot = 0; ulen; ulen -= n, ptr = (char *)ptr + n)
{
COMSTAT st;
DWORD inq = 1;
n = 0;
if (!vtime_ && !vmin_)
inq = ulen;
else if (vtime_)
{
inq = ulen; // non-interruptible -- have to use kernel timeouts
// also note that this is not strictly correct.
// if vmin > ulen then things won't work right.
overlapped_armed = -1;
}
if (!ClearCommError (get_handle (), &ev, &st))
goto err;
else if (ev)
termios_printf ("error detected %x", ev);
else if (st.cbInQue)
inq = st.cbInQue;
else if (!overlapped_armed)
{
if ((size_t)tot >= minchars)
break;
else if (WaitCommEvent (get_handle (), &ev, &io_status))
{
debug_printf ("WaitCommEvent succeeded: ev %x", ev);
if (!ev)
continue;
}
else if (GetLastError () != ERROR_IO_PENDING)
goto err;
else
{
overlapped_armed = 1;
switch (WaitForMultipleObjects (2, w4, FALSE, INFINITE))
{
case WAIT_OBJECT_0:
if (!GetOverlappedResult (get_handle (), &io_status, &n, FALSE))
goto err;
debug_printf ("n %d, ev %x", n, ev);
break;
case WAIT_OBJECT_0 + 1:
tot = -1;
PurgeComm (get_handle (), PURGE_RXABORT);
overlapped_armed = 0;
set_sig_errno (EINTR);
goto out;
default:
goto err;
}
}
}
overlapped_armed = 0;
ResetEvent (io_status.hEvent);
if (inq > ulen)
inq = ulen;
debug_printf ("inq %d", inq);
if (ReadFile (get_handle(), ptr, min (inq, ulen), &n, &io_status))
/* Got something */;
else if (GetLastError () != ERROR_IO_PENDING)
goto err;
else if (!GetOverlappedResult (get_handle (), &io_status, &n, TRUE))
goto err;
tot += n;
debug_printf ("vtime_ %d, vmin_ %d, n %d, tot %d", vtime_, vmin_, n, tot);
if (vtime_ || !vmin_ || !n)
break;
continue;
err:
PurgeComm (get_handle (), PURGE_RXABORT);
debug_printf ("err %E");
if (GetLastError () == ERROR_OPERATION_ABORTED)
n = 0;
else
{
tot = -1;
__seterrno ();
break;
}
}
out:
return tot;
}
/* Cover function to WriteFile to provide Posix interface and semantics
(as much as possible). */
int
fhandler_serial::raw_write (const void *ptr, size_t len)
{
DWORD bytes_written;
OVERLAPPED write_status;
memset (&write_status, 0, sizeof (write_status));
write_status.hEvent = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
ProtectHandle (write_status.hEvent);
for (;;)
{
if (WriteFile (get_handle(), ptr, len, &bytes_written, &write_status))
break;
switch (GetLastError ())
{
case ERROR_OPERATION_ABORTED:
continue;
case ERROR_IO_PENDING:
break;
default:
goto err;
}
if (!GetOverlappedResult (get_handle (), &write_status, &bytes_written, TRUE))
goto err;
break;
}
ForceCloseHandle(write_status.hEvent);
return bytes_written;
err:
__seterrno ();
ForceCloseHandle(write_status.hEvent);
return -1;
}
void
fhandler_serial::dump (void)
{
paranoid_printf ("here");
}
void
fhandler_serial::init (HANDLE f, DWORD flags, mode_t bin)
{
(void) open (NULL, flags, bin & (O_BINARY | O_TEXT));
}
int
fhandler_serial::open (path_conv *, int flags, mode_t mode)
{
int res;
COMMTIMEOUTS to;
extern BOOL reset_com;
syscall_printf ("fhandler_serial::open (%s, %p, %p)",
get_name (), flags, mode);
if (!(res = this->fhandler_base::open (NULL, flags, mode)))
return 0;
res = 1;
(void) SetCommMask (get_handle (), EV_RXCHAR);
set_r_no_interrupt (1); // Handled explicitly in read code
overlapped_setup ();
memset (&to, 0, sizeof (to));
(void) SetCommTimeouts (get_handle (), &to);
/* Reset serial port to known state of 9600-8-1-no flow control
on open for better behavior under Win 95.
FIXME: This should only be done when explicitly opening the com
port. It should not be reset if an fd is inherited.
Using __progname in this way, to determine how far along in the
initialization we are, is really a terrible kludge and should
be fixed ASAP.
*/
extern char *__progname;
if (reset_com && __progname)
{
DCB state;
GetCommState (get_handle (), &state);
syscall_printf ("setting initial state on %s (reset_com %d)",
get_name (), reset_com);
state.BaudRate = CBR_9600;
state.ByteSize = 8;
state.StopBits = ONESTOPBIT;
state.Parity = NOPARITY; /* FIXME: correct default? */
state.fBinary = TRUE; /* binary xfer */
state.EofChar = 0; /* no end-of-data in binary mode */
state.fNull = FALSE; /* don't discard nulls in binary mode */
state.fParity = FALSE; /* ignore parity errors */
state.fErrorChar = FALSE;
state.fTXContinueOnXoff = TRUE; /* separate TX and RX flow control */
state.fOutX = FALSE; /* disable transmission flow control */
state.fInX = FALSE; /* disable reception flow control */
state.XonChar = 0x11;
state.XoffChar = 0x13;
state.fOutxDsrFlow = FALSE; /* disable DSR flow control */
state.fRtsControl = RTS_CONTROL_ENABLE; /* ignore lead control except
DTR */
state.fOutxCtsFlow = FALSE; /* disable output flow control */
state.fDtrControl = DTR_CONTROL_ENABLE; /* assert DTR */
state.fDsrSensitivity = FALSE; /* don't assert DSR */
state.fAbortOnError = TRUE;
if (!SetCommState (get_handle (), &state))
system_printf ("couldn't set initial state for %s, %E", get_name ());
}
SetCommMask (get_handle (), EV_RXCHAR);
set_open_status ();
syscall_printf ("%p = fhandler_serial::open (%s, %p, %p)",
res, get_name (), flags, mode);
return res;
}
int
fhandler_serial::close ()
{
(void) ForceCloseHandle (io_status.hEvent);
return fhandler_base::close ();
}
/* tcsendbreak: POSIX 7.2.2.1 */
/* Break for 250-500 milliseconds if duration == 0 */
/* Otherwise, units for duration are undefined */
int
fhandler_serial::tcsendbreak (int duration)
{
unsigned int sleeptime = 300000;
if (duration > 0)
sleeptime *= duration;
if (SetCommBreak (get_handle ()) == 0)
return -1;
/* FIXME: need to send zero bits during duration */
usleep (sleeptime);
if (ClearCommBreak (get_handle ()) == 0)
return -1;
syscall_printf ("0 = fhandler_serial:tcsendbreak (%d)", duration);
return 0;
}
/* tcdrain: POSIX 7.2.2.1 */
int
fhandler_serial::tcdrain (void)
{
if (FlushFileBuffers (get_handle ()) == 0)
return -1;
return 0;
}
/* tcflow: POSIX 7.2.2.1 */
int
fhandler_serial::tcflow (int action)
{
DWORD win32action = 0;
DCB dcb;
char xchar;
termios_printf ("action %d", action);
switch (action)
{
case TCOOFF:
win32action = SETXOFF;
break;
case TCOON:
win32action = SETXON;
break;
case TCION:
case TCIOFF:
if (GetCommState (get_handle (), &dcb) == 0)
return -1;
if (action == TCION)
xchar = (dcb.XonChar ? dcb.XonChar : 0x11);
else
xchar = (dcb.XoffChar ? dcb.XoffChar : 0x13);
if (TransmitCommChar (get_handle (), xchar) == 0)
return -1;
return 0;
break;
default:
return -1;
break;
}
if (EscapeCommFunction (get_handle (), win32action) == 0)
return -1;
return 0;
}
/* tcflush: POSIX 7.2.2.1 */
int
fhandler_serial::tcflush (int queue)
{
if (queue == TCOFLUSH || queue == TCIOFLUSH)
PurgeComm (get_handle (), PURGE_TXABORT | PURGE_TXCLEAR);
if (queue == TCIFLUSH | queue == TCIOFLUSH)
/* Input flushing by polling until nothing turns up
(we stop after 1000 chars anyway) */
for (int max = 1000; max > 0; max--)
{
COMSTAT st;
if (!PurgeComm (get_handle (), PURGE_RXABORT | PURGE_RXCLEAR))
break;
Sleep (100);
if (!ClearCommError (get_handle (), &ev, &st) || !st.cbInQue)
break;
}
return 0;
}
/* tcsetattr: POSIX 7.2.1.1 */
int
fhandler_serial::tcsetattr (int action, const struct termios *t)
{
/* Possible actions:
TCSANOW: immediately change attributes.
TCSADRAIN: flush output, then change attributes.
TCSAFLUSH: flush output and discard input, then change attributes.
*/
BOOL dropDTR = FALSE;
COMMTIMEOUTS to;
DCB ostate, state;
unsigned int ovtime = vtime_, ovmin = vmin_;
termios_printf ("action %d", action);
if ((action == TCSADRAIN) || (action == TCSAFLUSH))
{
FlushFileBuffers (get_handle ());
termios_printf ("flushed file buffers");
}
if (action == TCSAFLUSH)
PurgeComm (get_handle (), (PURGE_RXABORT | PURGE_RXCLEAR));
/* get default/last comm state */
if (!GetCommState (get_handle (), &ostate))
return -1;
state = ostate;
/* -------------- Set baud rate ------------------ */
/* FIXME: WIN32 also has 14400, 56000, 128000, and 256000.
Unix also has 230400. */
switch (t->c_ospeed)
{
case B0: /* drop DTR */
dropDTR = TRUE;
state.BaudRate = 0;
break;
case B110:
state.BaudRate = CBR_110;
break;
case B300:
state.BaudRate = CBR_300;
break;
case B600:
state.BaudRate = CBR_600;
break;
case B1200:
state.BaudRate = CBR_1200;
break;
case B2400:
state.BaudRate = CBR_2400;
break;
case B4800:
state.BaudRate = CBR_4800;
break;
case B9600:
state.BaudRate = CBR_9600;
break;
case B19200:
state.BaudRate = CBR_19200;
break;
case B38400:
state.BaudRate = CBR_38400;
break;
case B57600:
state.BaudRate = CBR_57600;
break;
case B115200:
state.BaudRate = CBR_115200;
break;
default:
/* Unsupported baud rate! */
termios_printf ("Invalid t->c_ospeed %d", t->c_ospeed);
set_errno (EINVAL);
return -1;
}
/* -------------- Set byte size ------------------ */
switch (t->c_cflag & CSIZE)
{
case CS5:
state.ByteSize = 5;
break;
case CS6:
state.ByteSize = 6;
break;
case CS7:
state.ByteSize = 7;
break;
case CS8:
state.ByteSize = 8;
break;
default:
/* Unsupported byte size! */
termios_printf ("Invalid t->c_cflag byte size %d",
t->c_cflag & CSIZE);
set_errno (EINVAL);
return -1;
}
/* -------------- Set stop bits ------------------ */
if (t->c_cflag & CSTOPB)
state.StopBits = TWOSTOPBITS;
else
state.StopBits = ONESTOPBIT;
/* -------------- Set parity ------------------ */
if (t->c_cflag & PARENB)
state.Parity = (t->c_cflag & PARODD) ? ODDPARITY : EVENPARITY;
else
state.Parity = NOPARITY;
state.fBinary = TRUE; /* Binary transfer */
state.EofChar = 0; /* No end-of-data in binary mode */
state.fNull = FALSE; /* Don't discard nulls in binary mode */
/* -------------- Parity errors ------------------ */
/* fParity combines the function of INPCK and NOT IGNPAR */
if ((t->c_iflag & INPCK) && !(t->c_iflag & IGNPAR))
state.fParity = TRUE; /* detect parity errors */
else
state.fParity = FALSE; /* ignore parity errors */
/* Only present in Win32, Unix has no equivalent */
state.fErrorChar = FALSE;
state.ErrorChar = 0;
/* -------------- Set software flow control ------------------ */
/* Set fTXContinueOnXoff to FALSE. This prevents the triggering of a
premature XON when the remote device interprets a received character
as XON (same as IXANY on the remote side). Otherwise, a TRUE
value separates the TX and RX functions. */
state.fTXContinueOnXoff = TRUE; /* separate TX and RX flow control */
/* Transmission flow control */
if (t->c_iflag & IXON)
state.fOutX = TRUE; /* enable */
else
state.fOutX = FALSE; /* disable */
/* Reception flow control */
if (t->c_iflag & IXOFF)
state.fInX = TRUE; /* enable */
else
state.fInX = FALSE; /* disable */
/* XoffLim and XonLim are left at default values */
state.XonChar = (t->c_cc[VSTART] ? t->c_cc[VSTART] : 0x11);
state.XoffChar = (t->c_cc[VSTOP] ? t->c_cc[VSTOP] : 0x13);
/* -------------- Set hardware flow control ------------------ */
/* Disable DSR flow control */
state.fOutxDsrFlow = FALSE;
/* Some old flavors of Unix automatically enabled hardware flow
control when software flow control was not enabled. Since newer
Unices tend to require explicit setting of hardware flow-control,
this is what we do. */
/* RTS/CTS flow control */
if (t->c_cflag & CRTSCTS)
{ /* enable */
state.fOutxCtsFlow = TRUE;
state.fRtsControl = RTS_CONTROL_HANDSHAKE;
}
else
{ /* disable */
state.fRtsControl = RTS_CONTROL_ENABLE;
state.fOutxCtsFlow = FALSE;
}
if (t->c_cflag & CRTSXOFF)
state.fRtsControl = RTS_CONTROL_HANDSHAKE;
/* -------------- DTR ------------------ */
/* Assert DTR on device open */
state.fDtrControl = DTR_CONTROL_ENABLE;
/* -------------- DSR ------------------ */
/* Assert DSR at the device? */
if (t->c_cflag & CLOCAL)
state.fDsrSensitivity = FALSE; /* no */
else
state.fDsrSensitivity = TRUE; /* yes */
/* -------------- Error handling ------------------ */
/* Since read/write operations terminate upon error, we
will use ClearCommError() to resume. */
state.fAbortOnError = TRUE;
/* -------------- Set state and exit ------------------ */
if (memcmp (&ostate, &state, sizeof (state)) != 0)
SetCommState (get_handle (), &state);
set_r_binary ((t->c_iflag & IGNCR) ? 0 : 1);
set_w_binary ((t->c_oflag & ONLCR) ? 0 : 1);
if (dropDTR == TRUE)
EscapeCommFunction (get_handle (), CLRDTR);
else
{
/* FIXME: Sometimes when CLRDTR is set, setting
state.fDtrControl = DTR_CONTROL_ENABLE will fail. This
is a problem since a program might want to change some
parameters while DTR is still down. */
EscapeCommFunction (get_handle (), SETDTR);
}
/*
The following documentation on was taken from "Linux Serial Programming
HOWTO". It explains how MIN (t->c_cc[VMIN] || vmin_) and TIME
(t->c_cc[VTIME] || vtime_) is to be used.
In non-canonical input processing mode, input is not assembled into
lines and input processing (erase, kill, delete, etc.) does not
occur. Two parameters control the behavior of this mode: c_cc[VTIME]
sets the character timer, and c_cc[VMIN] sets the minimum number of
characters to receive before satisfying the read.
If MIN > 0 and TIME = 0, MIN sets the number of characters to receive
before the read is satisfied. As TIME is zero, the timer is not used.
If MIN = 0 and TIME > 0, TIME serves as a timeout value. The read will
be satisfied if a single character is read, or TIME is exceeded (t =
TIME *0.1 s). If TIME is exceeded, no character will be returned.
If MIN > 0 and TIME > 0, TIME serves as an inter-character timer. The
read will be satisfied if MIN characters are received, or the time
between two characters exceeds TIME. The timer is restarted every time
a character is received and only becomes active after the first
character has been received.
If MIN = 0 and TIME = 0, read will be satisfied immediately. The
number of characters currently available, or the number of characters
requested will be returned. According to Antonino (see contributions),
you could issue a fcntl(fd, F_SETFL, FNDELAY); before reading to get
the same result.
*/
if (t->c_lflag & ICANON)
{
vmin_ = MAXDWORD;
vtime_ = 0;
}
else
{
vtime_ = t->c_cc[VTIME] * 100;
vmin_ = t->c_cc[VMIN];
}
debug_printf ("vtime %d, vmin %d\n", vtime_, vmin_);
if (ovmin == vmin_ && ovtime == vtime_)
return 0;
memset (&to, 0, sizeof (to));
if ((vmin_ > 0) && (vtime_ == 0))
{
/* Returns immediately with whatever is in buffer on a ReadFile();
or blocks if nothing found. We will keep calling ReadFile(); until
vmin_ characters are read */
to.ReadIntervalTimeout = to.ReadTotalTimeoutMultiplier = MAXDWORD;
to.ReadTotalTimeoutConstant = MAXDWORD - 1;
}
else if ((vmin_ == 0) && (vtime_ > 0))
{
/* set timeoout constant appropriately and we will only try to
read one character in ReadFile() */
to.ReadTotalTimeoutConstant = vtime_;
to.ReadIntervalTimeout = to.ReadTotalTimeoutMultiplier = MAXDWORD;
}
else if ((vmin_ > 0) && (vtime_ > 0))
{
/* time applies to the interval time for this case */
to.ReadIntervalTimeout = vtime_;
}
else if ((vmin_ == 0) && (vtime_ == 0))
{
/* returns immediately with whatever is in buffer as per
Time-Outs docs in Win32 SDK API docs */
to.ReadIntervalTimeout = MAXDWORD;
}
debug_printf ("ReadTotalTimeoutConstant %d, ReadIntervalTimeout %d, ReadTotalTimeoutMultiplier %d",
to.ReadTotalTimeoutConstant, to.ReadIntervalTimeout, to.ReadTotalTimeoutMultiplier);
int res = SetCommTimeouts (get_handle (), &to);
if (!res)
{
system_printf ("SetCommTimeout failed, %E");
__seterrno ();
return -1;
}
return 0;
}
/* tcgetattr: POSIX 7.2.1.1 */
int
fhandler_serial::tcgetattr (struct termios *t)
{
DCB state;
/* Get current Win32 comm state */
if (GetCommState (get_handle (), &state) == 0)
return -1;
/* for safety */
memset (t, 0, sizeof (*t));
/* -------------- Baud rate ------------------ */
switch (state.BaudRate)
{
case 0:
/* FIXME: need to drop DTR */
t->c_cflag = t->c_ospeed = t->c_ispeed = B0;
break;
case CBR_110:
t->c_cflag = t->c_ospeed = t->c_ispeed = B110;
break;
case CBR_300:
t->c_cflag = t->c_ospeed = t->c_ispeed = B300;
break;
case CBR_600:
t->c_cflag = t->c_ospeed = t->c_ispeed = B600;
break;
case CBR_1200:
t->c_cflag = t->c_ospeed = t->c_ispeed = B1200;
break;
case CBR_2400:
t->c_cflag = t->c_ospeed = t->c_ispeed = B2400;
break;
case CBR_4800:
t->c_cflag = t->c_ospeed = t->c_ispeed = B4800;
break;
case CBR_9600:
t->c_cflag = t->c_ospeed = t->c_ispeed = B9600;
break;
case CBR_19200:
t->c_cflag = t->c_ospeed = t->c_ispeed = B19200;
break;
case CBR_38400:
t->c_cflag = t->c_ospeed = t->c_ispeed = B38400;
break;
case CBR_57600:
t->c_cflag = t->c_ospeed = t->c_ispeed = B57600;
break;
case CBR_115200:
t->c_cflag = t->c_ospeed = t->c_ispeed = B115200;
break;
default:
/* Unsupported baud rate! */
termios_printf ("Invalid baud rate %d", state.BaudRate);
set_errno (EINVAL);
return -1;
}
/* -------------- Byte size ------------------ */
switch (state.ByteSize)
{
case 5:
t->c_cflag |= CS5;
break;
case 6:
t->c_cflag |= CS6;
break;
case 7:
t->c_cflag |= CS7;
break;
case 8:
t->c_cflag |= CS8;
break;
default:
/* Unsupported byte size! */
termios_printf ("Invalid byte size %d", state.ByteSize);
set_errno (EINVAL);
return -1;
}
/* -------------- Stop bits ------------------ */
if (state.StopBits == TWOSTOPBITS)
t->c_cflag |= CSTOPB;
/* -------------- Parity ------------------ */
if (state.Parity == ODDPARITY)
t->c_cflag |= (PARENB | PARODD);
if (state.Parity == EVENPARITY)
t->c_cflag |= PARENB;
/* -------------- Parity errors ------------------ */
/* fParity combines the function of INPCK and NOT IGNPAR */
if (state.fParity == TRUE)
t->c_iflag |= INPCK;
else
t->c_iflag |= IGNPAR; /* not necessarily! */
/* -------------- Software flow control ------------------ */
/* transmission flow control */
if (state.fOutX)
t->c_iflag |= IXON;
/* reception flow control */
if (state.fInX)
t->c_iflag |= IXOFF;
t->c_cc[VSTART] = (state.XonChar ? state.XonChar : 0x11);
t->c_cc[VSTOP] = (state.XoffChar ? state.XoffChar : 0x13);
/* -------------- Hardware flow control ------------------ */
/* Some old flavors of Unix automatically enabled hardware flow
control when software flow control was not enabled. Since newer
Unices tend to require explicit setting of hardware flow-control,
this is what we do. */
/* Input flow-control */
if ((state.fRtsControl == RTS_CONTROL_HANDSHAKE) &&
(state.fOutxCtsFlow == TRUE))
t->c_cflag |= CRTSCTS;
if (state.fRtsControl == RTS_CONTROL_HANDSHAKE)
t->c_cflag |= CRTSXOFF;
/* -------------- CLOCAL --------------- */
/* DSR is only lead toggled only by CLOCAL. Check it to see if
CLOCAL was called. */
/* FIXME: If tcsetattr() hasn't been called previously, this may
give a false CLOCAL. */
if (state.fDsrSensitivity == FALSE)
t->c_cflag |= CLOCAL;
/* FIXME: need to handle IGNCR */
#if 0
if (!get_r_binary ())
t->c_iflag |= IGNCR;
#endif
if (!get_w_binary ())
t->c_oflag |= ONLCR;
debug_printf ("vmin_ %d, vtime_ %d", vmin_, vtime_);
if (vmin_ == MAXDWORD)
{
t->c_lflag |= ICANON;
t->c_cc[VTIME] = t->c_cc[VMIN] = 0;
}
else
{
t->c_cc[VTIME] = vtime_ / 100;
t->c_cc[VMIN] = vmin_;
}
return 0;
}
void
fhandler_serial::fixup_after_fork (HANDLE parent)
{
if (get_close_on_exec ())
this->fhandler_base::fixup_after_fork (parent);
overlapped_setup ();
debug_printf ("io_status.hEvent %p", io_status.hEvent);
}
void
fhandler_serial::fixup_after_exec (HANDLE)
{
overlapped_setup ();
debug_printf ("io_status.hEvent %p", io_status.hEvent);
return;
}
int
fhandler_serial::dup (fhandler_base *child)
{
fhandler_serial *fhc = (fhandler_serial *) child;
overlapped_setup ();
fhc->vmin_ = vmin_;
fhc->vtime_ = vtime_;
return fhandler_base::dup (child);
}
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