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/* fhandler_fifo.cc - See fhandler.h for a description of the fhandler classes.
Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 "miscfuncs.h"
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "sigproc.h"
#include "cygtls.h"
fhandler_fifo::fhandler_fifo ():
wait_state (fifo_unknown)
{
get_overlapped ()->hEvent = NULL;
need_fork_fixup (true);
}
HANDLE
fhandler_fifo::open_nonserver (const char *npname, unsigned low_flags,
LPSECURITY_ATTRIBUTES sa_buf)
{
DWORD mode = 0;
if (low_flags == O_RDONLY)
mode = GENERIC_READ;
else if (low_flags == O_WRONLY)
mode = GENERIC_WRITE;
else
mode = GENERIC_READ | GENERIC_WRITE;
while (1)
{
HANDLE h = CreateFile (npname, mode, 0, sa_buf, OPEN_EXISTING,
FILE_FLAG_OVERLAPPED, NULL);
if (h != INVALID_HANDLE_VALUE || GetLastError () != ERROR_PIPE_NOT_CONNECTED)
return h;
if (&_my_tls != _main_tls)
low_priority_sleep (0);
else if (WaitForSingleObject (signal_arrived, 0) == WAIT_OBJECT_0)
{
set_errno (EINTR);
return NULL;
}
}
}
#define FIFO_PIPE_MODE (PIPE_TYPE_BYTE | PIPE_READMODE_BYTE)
char *
fhandler_fifo::fifo_name (char *buf)
{
/* Generate a semi-unique name to associate with this fifo. */
__small_sprintf (buf, "\\\\.\\pipe\\__cygfifo__%08x_%016X",
get_dev (), get_ino ());
return buf;
}
int
fhandler_fifo::open (int flags, mode_t)
{
int res = 1;
char npname[MAX_PATH];
fifo_name (npname);
unsigned low_flags = flags & O_ACCMODE;
DWORD mode = 0;
if (low_flags == O_WRONLY)
/* ok */;
else if (low_flags == O_RDONLY)
mode = PIPE_ACCESS_INBOUND;
else if (low_flags == O_RDWR)
mode = PIPE_ACCESS_DUPLEX;
else
{
set_errno (EINVAL);
res = 0;
}
if (res)
{
char char_sa_buf[1024];
LPSECURITY_ATTRIBUTES sa_buf =
sec_user ((PSECURITY_ATTRIBUTES) char_sa_buf, cygheap->user.sid());
mode |= FILE_FLAG_OVERLAPPED;
HANDLE h;
DWORD err;
bool nonblocking_write = !!((flags & (O_WRONLY | O_NONBLOCK)) == (O_WRONLY | O_NONBLOCK));
if (flags & O_WRONLY)
{
h = INVALID_HANDLE_VALUE;
err = ERROR_ACCESS_DENIED;
}
else
{
h = CreateNamedPipe(npname, mode, FIFO_PIPE_MODE,
PIPE_UNLIMITED_INSTANCES, 0, 0,
NMPWAIT_WAIT_FOREVER, sa_buf);
err = GetLastError ();
}
if (h != INVALID_HANDLE_VALUE)
wait_state = fifo_wait_for_client;
else
switch (err)
{
case ERROR_ACCESS_DENIED:
h = open_nonserver (npname, low_flags, sa_buf);
if (h != INVALID_HANDLE_VALUE)
{
wait_state = fifo_ok;
break;
}
if (GetLastError () != ERROR_FILE_NOT_FOUND)
__seterrno ();
else if (nonblocking_write)
set_errno (ENXIO);
else
{
h = NULL;
nohandle (true);
wait_state = fifo_wait_for_server;
}
break;
default:
__seterrno ();
break;
}
if (h == INVALID_HANDLE_VALUE)
res = 0;
else if (!setup_overlapped ())
{
__seterrno ();
res = 0;
}
else
{
set_io_handle (h);
set_flags (flags);
res = 1;
}
}
debug_printf ("returning %d, errno %d", res, get_errno ());
return res;
}
bool
fhandler_fifo::wait (bool iswrite)
{
switch (wait_state)
{
case fifo_wait_for_next_client:
DisconnectNamedPipe (get_handle ());
case fifo_wait_for_client:
{
int res;
if ((res = ConnectNamedPipe (get_handle (), get_overlapped ()))
|| GetLastError () == ERROR_PIPE_CONNECTED)
{
wait_state = fifo_ok;
return true;
}
if (wait_state == fifo_wait_for_next_client)
{
CancelIo (get_handle ());
res = 0;
}
else
{
DWORD dummy_bytes;
res = wait_overlapped (res, iswrite, &dummy_bytes);
}
wait_state = res ? fifo_ok : fifo_eof;
}
break;
case fifo_wait_for_server:
if (get_io_handle ())
break;
char npname[MAX_PATH];
fifo_name (npname);
char char_sa_buf[1024];
LPSECURITY_ATTRIBUTES sa_buf;
sa_buf = sec_user ((PSECURITY_ATTRIBUTES) char_sa_buf, cygheap->user.sid());
while (1)
{
if (WaitNamedPipe (npname, 10))
/* connected, maybe */;
else if (GetLastError () != ERROR_SEM_TIMEOUT)
{
__seterrno ();
return false;
}
else if (WaitForSingleObject (signal_arrived, 0) != WAIT_OBJECT_0)
continue;
else if (_my_tls.call_signal_handler ())
continue;
else
{
set_errno (EINTR);
return false;
}
HANDLE h = open_nonserver (npname, get_flags () & O_ACCMODE, sa_buf);
if (h != INVALID_HANDLE_VALUE)
{
wait_state = fifo_ok;
set_io_handle (h);
nohandle (false);
break;
}
if (GetLastError () == ERROR_PIPE_LISTENING)
continue;
else
{
__seterrno ();
return false;
}
}
default:
break;
}
return true;
}
void
fhandler_fifo::raw_read (void *in_ptr, size_t& len)
{
while (wait_state != fifo_eof)
if (!wait (false))
len = 0;
else
{
read_overlapped (in_ptr, len);
if (!len)
wait_state = fifo_wait_for_next_client;
}
}
int
fhandler_fifo::raw_write (const void *ptr, size_t len)
{
return wait (true) ? write_overlapped (ptr, len) : -1;
}
int __stdcall
fhandler_fifo::fstatvfs (struct statvfs *sfs)
{
fhandler_disk_file fh (pc);
fh.get_device () = FH_FS;
return fh.fstatvfs (sfs);
}
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