c6ed5790b4
* cygheap.cc (cygheap_fixup_in_child): Call debug_fixup_after_fork_exec immediately after cygheap has ben set up.
198 lines
4.6 KiB
C++
198 lines
4.6 KiB
C++
/* pipe.cc: pipe for Cygwin.
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Copyright 1996, 1998, 1999, 2000, 2001, 2002 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 <errno.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "fhandler.h"
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#include "path.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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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 (DWORD devtype)
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: fhandler_base (devtype), 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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this->fhandler_base::set_close_on_exec (val);
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if (guard)
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set_inheritance (guard, val);
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if (writepipe_exists)
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set_inheritance (writepipe_exists, val);
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}
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int __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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return 0;
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int res = this->fhandler_base::read (in_ptr, in_len);
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(void) ReleaseMutex (guard);
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return res;
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}
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int fhandler_pipe::close ()
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{
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int res = this->fhandler_base::close ();
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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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return res;
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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_fork (HANDLE parent)
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{
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this->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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}
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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 = this->fhandler_base::dup (child);
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if (res)
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return res;
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fhandler_pipe *ftp = (fhandler_pipe *) child;
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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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return -1;
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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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return -1;
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}
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ftp->id = id;
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ftp->orig_pid = orig_pid;
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return 0;
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}
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int
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make_pipe (int fildes[2], unsigned int psize, int mode)
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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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cygheap_fdnew fdr;
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if (fdr >= 0)
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{
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cygheap_fdnew fdw (fdr, false);
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if (fdw < 0)
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/* out of fds? */;
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else if (!CreatePipe (&r, &w, sa, psize))
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__seterrno ();
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else
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{
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fhandler_pipe *fhr = (fhandler_pipe *) cygheap->fdtab.build_fhandler (fdr, FH_PIPER, "/dev/piper");
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fhandler_pipe *fhw = (fhandler_pipe *) cygheap->fdtab.build_fhandler (fdw, FH_PIPEW, "/dev/pipew");
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int binmode = mode & O_TEXT ?: O_BINARY;
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fhr->init (r, GENERIC_READ, binmode);
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fhw->init (w, GENERIC_WRITE, binmode);
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if (mode & O_NOINHERIT)
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{
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fhr->set_close_on_exec_flag (1);
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fhw->set_close_on_exec_flag (1);
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}
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fildes[0] = fdr;
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fildes[1] = fdw;
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res = 0;
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fhr->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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fhw->writepipe_exists = CreateEvent (sa, TRUE, FALSE, buf);
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fhr->orig_pid = myself->pid;
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fhr->id = count;
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}
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}
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}
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syscall_printf ("%d = make_pipe ([%d, %d], %d, %p)", res, fildes[0],
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fildes[1], psize, mode);
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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])
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{
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extern DWORD binmode;
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return make_pipe (filedes, 16384, (!binmode || binmode == O_BINARY) ? O_BINARY : O_TEXT);
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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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int res = make_pipe (filedes, 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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cygheap->fdtab[filedes[0]]->set_r_no_interrupt (1);
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return res;
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}
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