179 lines
3.5 KiB
C++
179 lines
3.5 KiB
C++
/* fhandler_fifo.cc. See fhandler.h for a description of the fhandler classes.
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Copyright 2002, 2003, 2004 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "cygerrno.h"
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#include "perprocess.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "pinfo.h"
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fhandler_fifo::fhandler_fifo ()
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: fhandler_pipe (), output_handle (NULL), owner (NULL),
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read_use (0), write_use (0)
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{
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}
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void
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fhandler_fifo::set_use (int incr)
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{
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long oread_use = read_use;
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if (get_flags () & (O_WRONLY | O_APPEND))
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write_use += incr;
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else if (get_flags () & O_RDWR)
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{
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write_use += incr;
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read_use += incr;
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}
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else
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read_use += incr;
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if (incr >= 0)
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return;
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if (read_use <= 0 && oread_use != read_use)
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{
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HANDLE h = get_handle ();
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if (h)
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{
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set_io_handle (NULL);
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CloseHandle (h);
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}
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}
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}
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int
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fhandler_fifo::close ()
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{
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fhandler_pipe::close ();
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CloseHandle (get_output_handle ());
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set_use (-1);
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return 0;
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}
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#define DUMMY_O_RDONLY 4
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int
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fhandler_fifo::open_not_mine (int flags)
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{
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winpids pids;
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static int flagtypes[] = {DUMMY_O_RDONLY | O_RDWR, O_WRONLY | O_APPEND | O_RDWR};
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HANDLE *usehandles[2] = {&(get_handle ()), &(get_output_handle ())};
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int res;
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for (unsigned i = 0; i < pids.npids; i++)
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{
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_pinfo *p = pids[i];
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HANDLE hp = OpenProcess (PROCESS_DUP_HANDLE, false, p->dwProcessId);
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if (!hp)
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{
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__seterrno ();
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goto err;
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}
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HANDLE handles[2];
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commune_result r;
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r = p->commune_send (PICOM_FIFO, get_win32_name ());
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if (r.handles[0] == NULL)
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continue; // process doesn't own fifo
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flags = (flags & (O_RDWR | O_WRONLY | O_APPEND)) ?: DUMMY_O_RDONLY;
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for (int i = 0; i < 2; i++)
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{
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if (!(flags & flagtypes[i]))
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continue;
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if (!DuplicateHandle (hp, r.handles[i], hMainProc, usehandles[i], 0,
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false, DUPLICATE_SAME_ACCESS))
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{
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debug_printf ("couldn't duplicate handle %d/%p, %E", i, handles[i]);
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__seterrno ();
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goto err;
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}
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if (i == 0)
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{
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read_state = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
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need_fork_fixup (true);
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}
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}
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CloseHandle (hp);
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res = 1;
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set_flags (flags);
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goto out;
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}
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set_errno (EAGAIN);
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err:
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res = 0;
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debug_printf ("failed");
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out:
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debug_printf ("res %d", res);
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return res;
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}
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int
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fhandler_fifo::open (int flags, mode_t)
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{
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int res = 1;
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fhandler_pipe *fhs[2];
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if (create (fhs, 0, flags, true))
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goto errnout;
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set_flags (fhs[0]->get_flags ());
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set_io_handle (fhs[0]->get_handle ());
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set_output_handle (fhs[1]->get_handle ());
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guard = fhs[0]->guard;
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read_state = fhs[0]->read_state;
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writepipe_exists = fhs[1]->writepipe_exists;
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orig_pid = fhs[0]->orig_pid;
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id = fhs[0]->id;
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delete (fhs[0]);
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delete (fhs[1]);
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set_use (1);
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goto out;
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errnout:
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__seterrno ();
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res = 0;
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out:
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debug_printf ("returning %d, errno %d", res, get_errno ());
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return res;
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}
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int
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fhandler_fifo::dup (fhandler_base * child)
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{
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int res = fhandler_pipe::dup (child);
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if (!res)
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{
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fhandler_fifo *ff = (fhandler_fifo *) child;
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if (!DuplicateHandle (hMainProc, get_output_handle (), hMainProc,
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&ff->get_output_handle (), false, true,
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DUPLICATE_SAME_ACCESS))
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{
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child->close ();
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res = -1;
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}
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}
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return 0;
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}
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