sysconf.c

Axis 221 camera embedded programing interface

/* Copyright (C) 1991, 93, 95, 96, 97, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#define _XOPEN_SOURCE  500
#include <features.h>
#include <errno.h>
#include <limits.h>
#include <grp.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <regex.h>

#ifndef __UCLIBC_CLK_TCK_CONST
#error __UCLIBC_CLK_TCK_CONST not defined!
#endif

extern int getpagesize (void);
extern int getdtablesize (void);

/***********************************************************************/
/*
 * Manuel Novoa III        Jan 2001
 *
 * On i386, the switch-based implementation generates 796 bytes of code.
 * However, many of the return values are repeats.  By collecting these
 * repeats and moving to a table-based implementation, we generate 283
 * bytes on i386 (-Os -fomit-frame-pointer).
 */

#ifdef _UCLIBC_GENERATE_SYSCONF_ARCH
/*
 * Set some errno's so the auto-gen code knows what it is dealing with.
 *    1) ENOSYS signifies that we're returning a default value.
 *       This is just extra info for development.
 *    2) EISNAM signifies that the value returned varies at runtime.
 *
 * Option: GETPAGESIZE_IS_DYNAMIC
 *    The current implementation of getpagesize in uClibc returns
 *    a constant.  The pagesize on the target arch should not vary,
 *    so it should be safe to set this as 0.
 */
#define RETURN_NEG_1 __set_errno(ENOSYS); return -1
#define RETURN_FUNCTION(f) __set_errno(EISNAM); return (long int) #f
#define GETPAGESIZE_IS_DYNAMIC 0
#else
#define RETURN_NEG_1 return -1
#define RETURN_FUNCTION(f) return f;
#endif /* _UCLIBC_GENERATE_SYSCONF_ARCH */

/* Get the value of the system variable NAME.  */
long int __sysconf(int name)
{
  switch (name)
    {
    default:
      __set_errno(EINVAL);
      return -1;

    case _SC_ARG_MAX:
#ifdef	ARG_MAX
      return ARG_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_CHILD_MAX:
#ifdef	CHILD_MAX
      return CHILD_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_CLK_TCK:
      /* Can't use CLK_TCK here since that calls __sysconf(_SC_CLK_TCK) */
      return __UCLIBC_CLK_TCK_CONST;

    case _SC_NGROUPS_MAX:
#ifdef	NGROUPS_MAX
      return NGROUPS_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_OPEN_MAX:
      RETURN_FUNCTION(getdtablesize());

    case _SC_STREAM_MAX:
#ifdef	STREAM_MAX
      return STREAM_MAX;
#else
      return FOPEN_MAX;
#endif

    case _SC_TZNAME_MAX:
      return _POSIX_TZNAME_MAX;

    case _SC_JOB_CONTROL:
#ifdef	_POSIX_JOB_CONTROL
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_SAVED_IDS:
#ifdef	_POSIX_SAVED_IDS
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_REALTIME_SIGNALS:
#ifdef	_POSIX_REALTIME_SIGNALS
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_PRIORITY_SCHEDULING:
#ifdef	_POSIX_PRIORITY_SCHEDULING
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_TIMERS:
#ifdef	_POSIX_TIMERS
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_ASYNCHRONOUS_IO:
#ifdef	_POSIX_ASYNCHRONOUS_IO
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_PRIORITIZED_IO:
#ifdef	_POSIX_PRIORITIZED_IO
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_SYNCHRONIZED_IO:
#ifdef	_POSIX_SYNCHRONIZED_IO
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_FSYNC:
#ifdef	_POSIX_FSYNC
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_MAPPED_FILES:
#ifdef	_POSIX_MAPPED_FILES
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_MEMLOCK:
#ifdef	_POSIX_MEMLOCK
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_MEMLOCK_RANGE:
#ifdef	_POSIX_MEMLOCK_RANGE
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_MEMORY_PROTECTION:
#ifdef	_POSIX_MEMORY_PROTECTION
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_MESSAGE_PASSING:
#ifdef	_POSIX_MESSAGE_PASSING
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_SEMAPHORES:
#ifdef	_POSIX_SEMAPHORES
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_SHARED_MEMORY_OBJECTS:
#ifdef	_POSIX_SHARED_MEMORY_OBJECTS
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_VERSION:
      return _POSIX_VERSION;

    case _SC_PAGESIZE:
#if defined(GETPAGESIZE_IS_DYNAMIC) && (GETPAGESIZE_IS_DYNAMIC == 1)
      RETURN_FUNCTION(getpagesize());
#else
      return getpagesize();		/* note: currently this is not dynamic */
#endif

    case _SC_AIO_LISTIO_MAX:
#ifdef	AIO_LISTIO_MAX
      return AIO_LISTIO_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_AIO_MAX:
#ifdef	AIO_MAX
      return AIO_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_AIO_PRIO_DELTA_MAX:
#ifdef	AIO_PRIO_DELTA_MAX
      return AIO_PRIO_DELTA_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_DELAYTIMER_MAX:
#ifdef	DELAYTIMER_MAX
      return DELAYTIMER_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_MQ_OPEN_MAX:
#ifdef	MQ_OPEN_MAX
      return MQ_OPEN_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_MQ_PRIO_MAX:
#ifdef	MQ_PRIO_MAX
      return MQ_PRIO_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_RTSIG_MAX:
#ifdef	RTSIG_MAX
      return RTSIG_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_SEM_NSEMS_MAX:
#ifdef	SEM_NSEMS_MAX
      return SEM_NSEMS_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_SEM_VALUE_MAX:
#ifdef	SEM_VALUE_MAX
      return SEM_VALUE_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_SIGQUEUE_MAX:
#ifdef	SIGQUEUE_MAX
      return SIGQUEUE_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_TIMER_MAX:
#ifdef	TIMER_MAX
      return TIMER_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_BC_BASE_MAX:
#ifdef	BC_BASE_MAX
      return BC_BASE_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_BC_DIM_MAX:
#ifdef	BC_DIM_MAX
      return BC_DIM_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_BC_SCALE_MAX:
#ifdef	BC_SCALE_MAX
      return BC_SCALE_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_BC_STRING_MAX:
#ifdef	BC_STRING_MAX
      return BC_STRING_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_COLL_WEIGHTS_MAX:
#ifdef	COLL_WEIGHTS_MAX
      return COLL_WEIGHTS_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_EQUIV_CLASS_MAX:
#ifdef	EQUIV_CLASS_MAX
      return EQUIV_CLASS_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_EXPR_NEST_MAX:
#ifdef	EXPR_NEST_MAX
      return EXPR_NEST_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_LINE_MAX:
#ifdef	LINE_MAX
      return LINE_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_RE_DUP_MAX:
#ifdef	RE_DUP_MAX
      return RE_DUP_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_CHARCLASS_NAME_MAX:
#ifdef	CHARCLASS_NAME_MAX
      return CHARCLASS_NAME_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_PII:
#ifdef	_POSIX_PII
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_PII_XTI:
#ifdef	_POSIX_PII_XTI
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_PII_SOCKET:
#ifdef	_POSIX_PII_SOCKET
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_PII_INTERNET:
#ifdef	_POSIX_PII_INTERNET
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_PII_OSI:
#ifdef	_POSIX_PII_OSI
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_POLL:
#ifdef	_POSIX_POLL
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_SELECT:
#ifdef	_POSIX_SELECT
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_UIO_MAXIOV:
#ifdef	UIO_MAXIOV
      return UIO_MAXIOV;
#else
      RETURN_NEG_1;
#endif