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/* pipe.cc: pipe for Cygwin.
Copyright 1996, 1998, 1999, 2000, 2001, 2002 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. */
/* FIXME: Should this really be fhandler_pipe.cc? */
#include "winsup.h"
#include <unistd.h>
#include <errno.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "cygheap.h"
#include "thread.h"
#include "pinfo.h"
static unsigned pipecount;
static const NO_COPY char pipeid_fmt[] = "stupid_pipe.%u.%u";
fhandler_pipe::fhandler_pipe (DWORD devtype)
: fhandler_base (devtype), guard (NULL), broken_pipe (false), writepipe_exists(0),
orig_pid (0), id (0)
{
}
__off64_t
fhandler_pipe::lseek (__off64_t offset, int whence)
{
debug_printf ("(%d, %d)", offset, whence);
set_errno (ESPIPE);
return -1;
}
void
fhandler_pipe::set_close_on_exec (int val)
{
this->fhandler_base::set_close_on_exec (val);
if (guard)
set_inheritance (guard, val);
if (writepipe_exists)
set_inheritance (writepipe_exists, val);
}
int __stdcall
fhandler_pipe::read (void *in_ptr, size_t in_len)
{
if (broken_pipe)
return 0;
int res = this->fhandler_base::read (in_ptr, in_len);
(void) ReleaseMutex (guard);
return res;
}
int fhandler_pipe::close ()
{
int res = this->fhandler_base::close ();
if (guard)
CloseHandle (guard);
if (writepipe_exists)
CloseHandle (writepipe_exists);
return res;
}
bool
fhandler_pipe::hit_eof ()
{
char buf[80];
HANDLE ev;
if (broken_pipe)
return 1;
if (!orig_pid)
return false;
__small_sprintf (buf, pipeid_fmt, orig_pid, id);
if ((ev = OpenEvent (EVENT_ALL_ACCESS, FALSE, buf)))
CloseHandle (ev);
debug_printf ("%s %p", buf, ev);
return ev == NULL;
}
void
fhandler_pipe::fixup_after_fork (HANDLE parent)
{
this->fhandler_base::fixup_after_fork (parent);
if (guard)
fork_fixup (parent, guard, "guard");
if (writepipe_exists)
fork_fixup (parent, writepipe_exists, "guard");
}
int
fhandler_pipe::dup (fhandler_base *child)
{
int res = this->fhandler_base::dup (child);
if (res)
return res;
fhandler_pipe *ftp = (fhandler_pipe *) child;
if (guard == NULL)
ftp->guard = NULL;
else if (!DuplicateHandle (hMainProc, guard, hMainProc, &ftp->guard, 0, 1,
DUPLICATE_SAME_ACCESS))
{
debug_printf ("couldn't duplicate guard %p, %E", guard);
return -1;
}
if (writepipe_exists == NULL)
ftp->writepipe_exists = NULL;
else if (!DuplicateHandle (hMainProc, writepipe_exists, hMainProc,
&ftp->writepipe_exists, 0, 1,
DUPLICATE_SAME_ACCESS))
{
debug_printf ("couldn't duplicate writepipe_exists %p, %E", writepipe_exists);
return -1;
}
ftp->id = id;
ftp->orig_pid = orig_pid;
return 0;
}
int
make_pipe (int fildes[2], unsigned int psize, int mode)
{
HANDLE r, w;
SECURITY_ATTRIBUTES *sa = (mode & O_NOINHERIT) ? &sec_none_nih : &sec_none;
int res = -1;
cygheap_fdnew fdr;
if (fdr >= 0)
{
cygheap_fdnew fdw (fdr, false);
if (fdw < 0)
/* out of fds? */;
else if (!CreatePipe (&r, &w, sa, psize))
__seterrno ();
else
{
fhandler_pipe *fhr = (fhandler_pipe *) cygheap->fdtab.build_fhandler (fdr, FH_PIPER, "/dev/piper");
fhandler_pipe *fhw = (fhandler_pipe *) cygheap->fdtab.build_fhandler (fdw, FH_PIPEW, "/dev/pipew");
int binmode = mode & O_TEXT ?: O_BINARY;
fhr->init (r, GENERIC_READ, binmode);
fhw->init (w, GENERIC_WRITE, binmode);
if (mode & O_NOINHERIT)
{
fhr->set_close_on_exec_flag (1);
fhw->set_close_on_exec_flag (1);
}
fildes[0] = fdr;
fildes[1] = fdw;
res = 0;
fhr->create_guard (sa);
if (wincap.has_unreliable_pipes ())
{
char buf[80];
int count = pipecount++; /* FIXME: Should this be InterlockedIncrement? */
__small_sprintf (buf, pipeid_fmt, myself->pid, count);
fhw->writepipe_exists = CreateEvent (sa, TRUE, FALSE, buf);
fhr->orig_pid = myself->pid;
fhr->id = count;
}
}
}
syscall_printf ("%d = make_pipe ([%d, %d], %d, %p)", res, fildes[0],
fildes[1], psize, mode);
return res;
}
extern "C" int
pipe (int filedes[2])
{
extern DWORD binmode;
return make_pipe (filedes, 16384, (!binmode || binmode == O_BINARY) ? O_BINARY : O_TEXT);
}
extern "C" int
_pipe (int filedes[2], unsigned int psize, int mode)
{
int res = make_pipe (filedes, psize, mode);
/* This type of pipe is not interruptible so set the appropriate flag. */
if (!res)
cygheap->fdtab[filedes[0]]->set_r_no_interrupt (1);
return res;
}
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