324 lines
7.2 KiB
C++
324 lines
7.2 KiB
C++
/* pipe.cc: pipe for Cygwin.
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Copyright 1996, 1998, 1999, 2000, 2001, 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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/* FIXME: Should this really be fhandler_pipe.cc? */
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#include "winsup.h"
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#include <unistd.h>
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#include <sys/socket.h>
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#include "cygerrno.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 "thread.h"
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#include "pinfo.h"
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#include "cygthread.h"
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static unsigned pipecount;
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static const NO_COPY char pipeid_fmt[] = "stupid_pipe.%u.%u";
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fhandler_pipe::fhandler_pipe ()
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: fhandler_base (), guard (NULL), broken_pipe (false), writepipe_exists(0),
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orig_pid (0), id (0)
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{
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}
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_off64_t
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fhandler_pipe::lseek (_off64_t offset, int whence)
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{
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debug_printf ("(%d, %d)", offset, whence);
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set_errno (ESPIPE);
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return -1;
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}
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void
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fhandler_pipe::set_close_on_exec (int val)
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{
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fhandler_base::set_close_on_exec (val);
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if (guard)
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set_no_inheritance (guard, val);
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if (writepipe_exists)
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set_no_inheritance (writepipe_exists, val);
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}
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struct pipeargs
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{
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fhandler_base *fh;
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void *ptr;
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size_t *len;
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};
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static DWORD WINAPI
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read_pipe (void *arg)
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{
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pipeargs *pi = (pipeargs *) arg;
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pi->fh->fhandler_base::read (pi->ptr, *pi->len);
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return 0;
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}
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void __stdcall
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fhandler_pipe::read (void *in_ptr, size_t& in_len)
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{
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if (broken_pipe)
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in_len = 0;
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else
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{
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pipeargs pi = {dynamic_cast<fhandler_base *>(this), in_ptr, &in_len};
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ResetEvent (read_state);
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cygthread *th = new cygthread (read_pipe, &pi, "read_pipe");
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if (th->detach (read_state) && !in_len)
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in_len = (size_t) -1; /* received a signal */
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}
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(void) ReleaseMutex (guard);
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return;
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}
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int
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fhandler_pipe::close ()
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{
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if (guard)
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CloseHandle (guard);
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if (writepipe_exists)
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CloseHandle (writepipe_exists);
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#ifndef NEWVFORK
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if (read_state)
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#else
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// FIXME is this vfork_cleanup test right? Is it responsible for some of
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// the strange pipe behavior that has been reported in the cygwin mailing
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// list?
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if (read_state && !cygheap->fdtab.in_vfork_cleanup ())
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#endif
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ForceCloseHandle (read_state);
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if (get_handle ())
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{
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CloseHandle (get_handle ());
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set_io_handle (NULL);
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}
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return 0;
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}
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bool
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fhandler_pipe::hit_eof ()
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{
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char buf[80];
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HANDLE ev;
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if (broken_pipe)
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return 1;
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if (!orig_pid)
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return false;
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__small_sprintf (buf, pipeid_fmt, orig_pid, id);
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if ((ev = OpenEvent (EVENT_ALL_ACCESS, FALSE, buf)))
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CloseHandle (ev);
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debug_printf ("%s %p", buf, ev);
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return ev == NULL;
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}
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void
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fhandler_pipe::fixup_after_exec ()
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{
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if (read_state)
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{
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read_state = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
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ProtectHandle (read_state);
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}
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}
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void
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fhandler_pipe::fixup_after_fork (HANDLE parent)
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{
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fhandler_base::fixup_after_fork (parent);
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if (guard)
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fork_fixup (parent, guard, "guard");
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if (writepipe_exists)
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fork_fixup (parent, writepipe_exists, "guard");
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fixup_after_exec ();
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}
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int
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fhandler_pipe::dup (fhandler_base *child)
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{
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int res = -1;
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fhandler_pipe *ftp = (fhandler_pipe *) child;
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ftp->guard = ftp->writepipe_exists = ftp->read_state = NULL;
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if (get_handle ())
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{
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res = fhandler_base::dup (child);
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if (res)
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goto err;
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}
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/* FIXME: This leaks handles in the failing condition */
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if (guard == NULL)
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ftp->guard = NULL;
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else if (!DuplicateHandle (hMainProc, guard, hMainProc, &ftp->guard, 0, 1,
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DUPLICATE_SAME_ACCESS))
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{
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debug_printf ("couldn't duplicate guard %p, %E", guard);
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goto err;
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}
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if (writepipe_exists == NULL)
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ftp->writepipe_exists = NULL;
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else if (!DuplicateHandle (hMainProc, writepipe_exists, hMainProc,
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&ftp->writepipe_exists, 0, 1,
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DUPLICATE_SAME_ACCESS))
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{
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debug_printf ("couldn't duplicate writepipe_exists %p, %E", writepipe_exists);
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goto err;
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}
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if (read_state == NULL)
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ftp->read_state = NULL;
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else if (!DuplicateHandle (hMainProc, read_state, hMainProc,
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&ftp->read_state, 0, 1,
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DUPLICATE_SAME_ACCESS))
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{
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debug_printf ("couldn't duplicate read_state %p, %E", read_state);
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goto err;
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}
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res = 0;
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goto out;
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err:
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if (!ftp->guard)
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CloseHandle (ftp->guard);
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if (!ftp->writepipe_exists)
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CloseHandle (ftp->writepipe_exists);
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if (!ftp->read_state)
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CloseHandle (ftp->read_state);
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goto leave;
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out:
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ftp->id = id;
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ftp->orig_pid = orig_pid;
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VerifyHandle (ftp->guard);
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VerifyHandle (ftp->writepipe_exists);
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VerifyHandle (ftp->read_state);
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leave:
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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_pipe::create (fhandler_pipe *fhs[2], unsigned psize, int mode, bool fifo)
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{
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HANDLE r, w;
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SECURITY_ATTRIBUTES *sa = (mode & O_NOINHERIT) ? &sec_none_nih : &sec_none;
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int res = -1;
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if (!CreatePipe (&r, &w, sa, psize))
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__seterrno ();
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else
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{
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fhs[0] = (fhandler_pipe *) build_fh_dev (*piper_dev);
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fhs[1] = (fhandler_pipe *) build_fh_dev (*pipew_dev);
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int binmode = mode & O_TEXT ?: O_BINARY;
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fhs[0]->init (r, GENERIC_READ, binmode);
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fhs[1]->init (w, GENERIC_WRITE, binmode);
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if (mode & O_NOINHERIT)
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{
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fhs[0]->set_close_on_exec_flag (1);
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fhs[1]->set_close_on_exec_flag (1);
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}
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fhs[0]->read_state = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
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fhs[0]->set_need_fork_fixup ();
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ProtectHandle1 (fhs[0]->read_state, read_state);
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res = 0;
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fhs[0]->create_guard (sa);
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if (wincap.has_unreliable_pipes ())
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{
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char buf[80];
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int count = pipecount++; /* FIXME: Should this be InterlockedIncrement? */
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__small_sprintf (buf, pipeid_fmt, myself->pid, count);
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fhs[1]->writepipe_exists = CreateEvent (sa, TRUE, FALSE, buf);
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fhs[0]->orig_pid = myself->pid;
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fhs[0]->id = count;
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}
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}
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syscall_printf ("%d = ([%p, %p], %d, %p)", res, fhs[0], fhs[1], psize, mode);
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return res;
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}
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int
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fhandler_pipe::ioctl (unsigned int cmd, void *p)
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{
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int n;
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switch (cmd)
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{
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case FIONREAD:
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if (get_device () == FH_PIPEW)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (!PeekNamedPipe (get_handle (), NULL, 0, NULL, (DWORD *) &n, NULL))
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{
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__seterrno ();
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return -1;
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}
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break;
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default:
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return fhandler_base::ioctl (cmd, p);
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break;
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}
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*(int *) p = n;
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return 0;
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}
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extern "C" int
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pipe (int filedes[2])
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{
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extern DWORD binmode;
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fhandler_pipe *fhs[2];
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int res = fhandler_pipe::create (fhs, 16384, (!binmode || binmode == O_BINARY)
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? O_BINARY : O_TEXT);
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if (res == 0)
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{
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cygheap_fdnew fdin;
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cygheap_fdnew fdout (fdin, false);
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fdin = fhs[0];
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fdout = fhs[1];
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filedes[0] = fdin;
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filedes[1] = fdout;
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}
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return res;
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}
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extern "C" int
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_pipe (int filedes[2], unsigned int psize, int mode)
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{
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fhandler_pipe *fhs[2];
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int res = fhandler_pipe::create (fhs, psize, mode);
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/* This type of pipe is not interruptible so set the appropriate flag. */
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if (!res)
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{
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cygheap_fdnew fdin;
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cygheap_fdnew fdout (fdin, false);
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fhs[0]->set_r_no_interrupt (1);
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fdin = fhs[0];
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fdout = fhs[1];
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filedes[0] = fdin;
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filedes[1] = fdout;
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}
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return res;
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}
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