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/* pipe.cc: pipe for Cygwin.
Copyright 1996, 1998, 1999, 2000, 2001 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 <unistd.h>
#include <sys/fcntl.h>
#include <errno.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "thread.h"
fhandler_pipe::fhandler_pipe (const char *name, DWORD devtype) :
fhandler_base (devtype, name), guard (0)
{
set_cb (sizeof *this);
}
off_t
fhandler_pipe::lseek (off_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);
set_inheritance (guard, val);
}
int
fhandler_pipe::read (void *in_ptr, size_t in_len)
{
int res = this->fhandler_base::read (in_ptr, in_len);
ReleaseMutex (guard);
return res;
}
int fhandler_pipe::close ()
{
int res = this->fhandler_base::close ();
if (guard)
CloseHandle (guard);
return res;
}
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))
return -1;
return 0;
}
static int
make_pipe (int fildes[2], unsigned int psize, int mode)
{
SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "make_pipe");
HANDLE r, w;
int fdr = -1, fdw = -1;
SECURITY_ATTRIBUTES *sa = (mode & O_NOINHERIT) ? &sec_none_nih : &sec_none;
int res = -1;
if ((fdr = cygheap->fdtab.find_unused_handle ()) < 0)
set_errno (ENMFILE);
else if ((fdw = cygheap->fdtab.find_unused_handle (fdr + 1)) < 0)
set_errno (ENMFILE);
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 ? 0 : 1;
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);
}
syscall_printf ("%d = make_pipe ([%d, %d], %d, %p)", res, fdr, fdw, psize, mode);
ReleaseResourceLock(LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "make_pipe");
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;
}
int
dup (int fd)
{
int res;
SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
res = dup2 (fd, cygheap->fdtab.find_unused_handle ());
ReleaseResourceLock(LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
return res;
}
int
dup2 (int oldfd, int newfd)
{
return cygheap->fdtab.dup2 (oldfd, newfd);
}
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