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/*
* linux/ibcs/sysconf.c
*
* Copyright (C) 1994 Mike Jagdis (jaggy@purplet.demon.co.uk)
*
* $Id: sysconf.c,v 1.8 1997/07/11 21:28:18 jaggy Exp $
* $Source: /usr/CVS/ibcs/iBCSemul/sysconf.c,v $
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/version.h>
#include <asm/segment.h>
#ifndef KERNEL_DS
#include <linux/segment.h>
#endif
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/limits.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/fcntl.h>
#include <asm/system.h>
#include <linux/fs.h>
#include <linux/sys.h>
#include <ibcs/ibcs.h>
#ifdef IBCS_TRACE
#include <ibcs/trace.h>
#endif
/* The sysconf() call is supposed to give applications access to various
* kernel parameters. According to SCO's man page this a POSIX mandated
* function. Perhaps it should be moved across as a native Linux call?
*
* N.B. SCO only has sysconf in the Xenix group. Therefore this is based
* on the Xenix spec. Is SVR4 the same? Wyse Unix V.3.2.1A doesn't have
* sysconf documented at all.
*
* N.B. 0-7 are required (by who?). Other values may be defined for
* various systems but there appears no guarantee that they match across
* platforms. Thus, unless we can identify what system the executable
* was compiled for, we probably prefer to have extensions fail. Hell,
* nothing important is going to use this obscure stuff anyway...
*/
#define _SC_ARG_MAX 0
#define _SC_CHILD_MAX 1
#define _SC_CLK_TCK 2
#define _SC_NGROUPS_MAX 3
#define _SC_OPEN_MAX 4
#define _SC_JOB_CONTROL 5
#define _SC_SAVED_IDS 6
#define _SC_VERSION 7
#define _SC_PAGESIZE 11
/* This is an SVR4 system call that is undocumented except for some
* hints in a header file. It appears to be a forerunner to the
* POSIX sysconf() call.
*/
int ibcs_sysconfig(int name)
{
switch (name) {
case 2: /* _CONFIG_NGROUPS */
/* From limits.h */
return (NGROUPS_MAX);
case 3: /* _CONFIG_CHILD_MAX */
/* From limits.h */
return (CHILD_MAX);
case 4: /* _CONFIG_OPEN_FILES */
/* From limits.h */
return (OPEN_MAX);
case 5: /* _CONFIG_POSIX_VER */
/* The version of the POSIX standard we conform
* to. SCO defines _POSIX_VERSION as 198808L
* sys/unistd.h. What are we?
* (N.B. SCO does not even do sysconfig but I
* have no SVR4 running)
*/
return (198808L);
case 6: /* _CONFIG_PAGESIZE */
return PAGE_SIZE;
case 7: /* _CONFIG_CLK_TCK */
return (HZ);
case 8: /* _CONFIG_XOPEN_VER */
return -EINVAL; /* FIXME: huh? */
case 9: /* _CONFIG_NACLS_MAX */
return -EINVAL; /* FIXME: huh? */
case 10: /* _CONFIG_ARG_MAX */
/* From limits.h */
return (ARG_MAX);
}
#ifdef IBCS_TRACE
if ((ibcs_trace & TRACE_API) || ibcs_func_p->trace) {
printk(KERN_DEBUG "iBCS2 unsupported sysconfig call %d\n", name);
}
#endif
return -EINVAL;
}
int ibcs_sysconf(int name) {
switch (name) {
case _SC_ARG_MAX:
/* From limits.h */
return (ARG_MAX);
case _SC_CHILD_MAX:
/* From limits.h */
return (CHILD_MAX);
case _SC_CLK_TCK:
return (HZ);
case _SC_NGROUPS_MAX:
/* From limits.h */
return (NGROUPS_MAX);
case _SC_OPEN_MAX:
/* From limits.h */
return (OPEN_MAX);
case _SC_JOB_CONTROL:
return (1);
case _SC_SAVED_IDS:
return (1);
case _SC_PAGESIZE:
return PAGE_SIZE;
case _SC_VERSION:
/* The version of the POSIX standard we conform
* to. SCO defines _POSIX_VERSION as 198808L
* sys/unistd.h. What are we?
*/
return (198808L);
}
#ifdef IBCS_TRACE
if ((ibcs_trace & TRACE_API) || ibcs_func_p->trace) {
printk(KERN_DEBUG "iBCS2 unsupported sysconf call %d\n", name);
}
#endif
return -EINVAL;
}
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