/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Bell Laboratories
*
* 3d fs operations
* only active for non-shared 3d library
*/
#define mount ______mount
#include <ast.h>
#undef mount
#include <fs3d.h>
int
fs3d(register int op)
{
register int cur;
register char* v;
char val[sizeof(FS3D_off) + 8];
static int fsview;
static char on[] = FS3D_on;
static char off[] = FS3D_off;
if (fsview < 0)
return 0;
/*
* get the current setting
*/
if (!fsview && (!getenv("LD_PRELOAD") || mount("", "", 0, NiL)))
goto nope;
if (FS3D_op(op) == FS3D_OP_INIT && mount(FS3D_init, NiL, FS3D_VIEW, NiL))
goto nope;
if (mount(on, val, FS3D_VIEW|FS3D_GET|FS3D_SIZE(sizeof(val)), NiL))
goto nope;
if (v = strchr(val, ' '))
v++;
else
v = val;
if (!strcmp(v, on))
cur = FS3D_ON;
else if (!strncmp(v, off, sizeof(off) - 1) && v[sizeof(off)] == '=')
cur = FS3D_LIMIT((int)strtol(v + sizeof(off) + 1, NiL, 0));
else
cur = FS3D_OFF;
if (cur != op)
{
switch (FS3D_op(op))
{
case FS3D_OP_OFF:
v = off;
break;
case FS3D_OP_ON:
v = on;
break;
case FS3D_OP_LIMIT:
sfsprintf(val, sizeof(val), "%s=%d", off, FS3D_arg(op));
v = val;
break;
default:
v = 0;
break;
}
if (v && mount(v, NiL, FS3D_VIEW, NiL))
goto nope;
}
fsview = 1;
return cur;
nope:
fsview = -1;
return 0;
}
/*
* user code that includes <fs3d.h> will have mount() mapped to fs3d_mount()
* this restricts the various "standard" mount prototype conflicts to this spot
* this means that code that includes <fs3d.h> cannot access the real mount
* (at least without some additional macro hackery
*/
#undef mount
extern int mount(const char*, char*, int, void*);
int
fs3d_mount(const char* source, char* target, int flags, void* data)
{
return mount(source, target, flags, data);
}