getconf.c

UNIX下SH的实现源码

/*
 * ORIGINAL COPYRIGHT STATEMENT:
 *
 * Copyright (c) 1994 Winning Strategies, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Winning Strategies, Inc.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * POSIX.2 getconf utility
 *
 * Originally Written by:
 *	J.T. Conklin ([e-mail]), Winning Strategies, Inc.
 *
 * Heavily modified for inclusion in bash by
 *	Chet Ramey <[e-mail]>
 */

#include <stdio.h>
#include <limits.h>
#include <locale.h>
#include <unistd.h>
#include <errno.h>
#include "bashansi.h"
#include "shell.h"
#include "builtins.h"
#include "stdc.h"
#include "common.h"
#include "bashgetopt.h"

struct conf_variable
{
  const char *name;
  enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type;
  long value;
};

/* Some systems do not define these; use POSIX.2 minimum recommended values. */
#ifndef _POSIX2_COLL_WEIGHTS_MAX
#  define _POSIX2_COLL_WEIGHTS_MAX 2
#endif

static const struct conf_variable conf_table[] =
{
  /* POSIX.2 Configurable Variable Values */
  { "PATH",			CONFSTR,	_CS_PATH		},
  { "CS_PATH",			CONFSTR,	_CS_PATH		},

  /* POSIX.1 Configurable Variable Values (only Solaris?) */
#if defined (_CS_LFS_CFLAGS)
  { "LFS_CFLAGS",		CONFSTR,	_CS_LFS_CFLAGS		},
  { "LFS_LDFLAGS",		CONFSTR,	_CS_LFS_LDFLAGS		},
  { "LFS_LIBS",			CONFSTR,	_CS_LFS_LIBS		},
  { "LFS_LINTFLAGS",		CONFSTR,	_CS_LFS_LINTFLAGS	},
#endif
#if defined (_CS_LFS64_CFLAGS)
  { "LFS64_CFLAGS",		CONFSTR,	_CS_LFS64_CFLAGS	},
  { "LFS64_LDFLAGS",		CONFSTR,	_CS_LFS64_LDFLAGS	},
  { "LFS64_LIBS",		CONFSTR,	_CS_LFS64_LIBS		},
  { "LFS64_LINTFLAGS",		CONFSTR,	_CS_LFS64_LINTFLAGS	},
#endif

  /* Single UNIX Specification version 2 Configurable Variable Values */
#if defined (_CS_XBS5_ILP32_OFF32_CFLAGS)
  { "XBS5_ILP32_OFF32_CFLAGS",  	CONFSTR,	_CS_XBS5_ILP32_OFF32_CFLAGS },
  { "XBS5_ILP32_OFF32_LDFLAGS",		CONFSTR,	_CS_XBS5_ILP32_OFF32_LDFLAGS },
  { "XBS5_ILP32_OFF32_LIBS",    	CONFSTR,	_CS_XBS5_ILP32_OFF32_LIBS },
  { "XBS5_ILP32_OFF32_LINTFLAGS",       CONFSTR,	_CS_XBS5_ILP32_OFF32_LINTFLAGS },
  { "XBS5_ILP32_OFFBIG_CFLAGS", 	CONFSTR,	_CS_XBS5_ILP32_OFFBIG_CFLAGS },
  { "XBS5_ILP32_OFFBIG_LDFLAGS",	CONFSTR,	_CS_XBS5_ILP32_OFFBIG_LDFLAGS },
  { "XBS5_ILP32_OFFBIG_LIBS",   	CONFSTR,	_CS_XBS5_ILP32_OFFBIG_LIBS },
  { "XBS5_ILP32_OFFBIG_LINTFLAGS",      CONFSTR,	_CS_XBS5_ILP32_OFFBIG_LINTFLAGS },
  { "XBS5_LP64_OFF64_CFLAGS",   	CONFSTR,	_CS_XBS5_LP64_OFF64_CFLAGS },
  { "XBS5_LP64_OFF64_LDFLAGS",  	CONFSTR,	_CS_XBS5_LP64_OFF64_LDFLAGS },
  { "XBS5_LP64_OFF64_LIBS",     	CONFSTR,	_CS_XBS5_LP64_OFF64_LIBS },
  { "XBS5_LP64_OFF64_LINTFLAGS",	CONFSTR,	_CS_XBS5_LP64_OFF64_LINTFLAGS },
  { "XBS5_LPBIG_OFFBIG_CFLAGS", 	CONFSTR,	_CS_XBS5_LPBIG_OFFBIG_CFLAGS },
  { "XBS5_LPBIG_OFFBIG_LDFLAGS",	CONFSTR,	_CS_XBS5_LPBIG_OFFBIG_LDFLAGS },
  { "XBS5_LPBIG_OFFBIG_LIBS",   	CONFSTR,	_CS_XBS5_LPBIG_OFFBIG_LIBS },
  { "XBS5_LPBIG_OFFBIG_LINTFLAGS",      CONFSTR,	_CS_XBS5_LPBIG_OFFBIG_LINTFLAGS },
#endif /* _CS_XBS5_ILP32_OFF32_CFLAGS */

  /* POSIX.2 Utility Limit Minimum Values */
  { "POSIX2_BC_BASE_MAX",	CONSTANT,	_POSIX2_BC_BASE_MAX	},
  { "POSIX2_BC_DIM_MAX",	CONSTANT,	_POSIX2_BC_DIM_MAX	},
  { "POSIX2_BC_SCALE_MAX",	CONSTANT,	_POSIX2_BC_SCALE_MAX	},
  { "POSIX2_BC_STRING_MAX",	CONSTANT,	_POSIX2_BC_STRING_MAX	},
  { "POSIX2_COLL_WEIGHTS_MAX",	CONSTANT,	_POSIX2_COLL_WEIGHTS_MAX },
#if defined (_POSIX2_EQUIV_CLASS_MAX)
  { "POSIX2_EQUIV_CLASS_MAX",	CONSTANT,	_POSIX2_EQUIV_CLASS_MAX	},
#endif
  { "POSIX2_EXPR_NEST_MAX",	CONSTANT,	_POSIX2_EXPR_NEST_MAX	},
  { "POSIX2_LINE_MAX",		CONSTANT,	_POSIX2_LINE_MAX	},
  { "POSIX2_RE_DUP_MAX",	CONSTANT,	_POSIX2_RE_DUP_MAX	},
#if defined (_POSIX2_VERSION)
  { "POSIX2_VERSION",		CONSTANT,	_POSIX2_VERSION		},
#endif

  /* POSIX.1 Minimum Values */
  { "_POSIX_ARG_MAX",		CONSTANT,	_POSIX_ARG_MAX		},
  { "_POSIX_CHILD_MAX",		CONSTANT,	_POSIX_CHILD_MAX	},
  { "_POSIX_LINK_MAX",		CONSTANT,	_POSIX_LINK_MAX		},
  { "_POSIX_MAX_CANON",		CONSTANT,	_POSIX_MAX_CANON	},
  { "_POSIX_MAX_INPUT",		CONSTANT,	_POSIX_MAX_INPUT	},
  { "_POSIX_NAME_MAX",		CONSTANT,	_POSIX_NAME_MAX		},
  { "_POSIX_NGROUPS_MAX",	CONSTANT,	_POSIX_NGROUPS_MAX	},
  { "_POSIX_OPEN_MAX",		CONSTANT,	_POSIX_OPEN_MAX		},
  { "_POSIX_PATH_MAX",		CONSTANT,	_POSIX_PIPE_BUF		},
  { "_POSIX_PIPE_BUF",		CONSTANT,	_POSIX_PIPE_BUF		},
  { "_POSIX_SSIZE_MAX",		CONSTANT,	_POSIX_SSIZE_MAX	},
  { "_POSIX_STREAM_MAX",	CONSTANT,	_POSIX_STREAM_MAX	},
  { "_POSIX_TZNAME_MAX",	CONSTANT,	_POSIX_TZNAME_MAX	},

  /* POSIX.2 Symbolic Utility Limits */
  { "BC_BASE_MAX",		SYSCONF,	_SC_BC_BASE_MAX		},
  { "BC_DIM_MAX",		SYSCONF,	_SC_BC_DIM_MAX		},
  { "BC_SCALE_MAX",		SYSCONF,	_SC_BC_SCALE_MAX	},
  { "BC_STRING_MAX",		SYSCONF,	_SC_BC_STRING_MAX	},
  { "COLL_WEIGHTS_MAX",		SYSCONF,	_SC_COLL_WEIGHTS_MAX	},
  { "EXPR_NEST_MAX",		SYSCONF,	_SC_EXPR_NEST_MAX	},
  { "LINE_MAX",			SYSCONF,	_SC_LINE_MAX		},
  { "RE_DUP_MAX",		SYSCONF,	_SC_RE_DUP_MAX		},

  /* POSIX.2 Optional Facility Configuration Values */
  { "POSIX2_C_BIND",		SYSCONF,	_SC_2_C_BIND		},
  { "POSIX2_C_DEV",		SYSCONF,	_SC_2_C_DEV		},
#if defined (_SC_2_C_VERSION)
  { "POSIX2_C_VERSION",		SYSCONF,	_SC_2_C_VERSION		},
#endif
#if defined (_SC_2_CHAR_TERM)
  { "POSIX2_CHAR_TERM",		SYSCONF,	_SC_2_CHAR_TERM		},
#endif
  { "POSIX2_FORT_DEV",		SYSCONF,	_SC_2_FORT_DEV		},
  { "POSIX2_FORT_RUN",		SYSCONF,	_SC_2_FORT_RUN		},
  { "POSIX2_LOCALEDEF",		SYSCONF,	_SC_2_LOCALEDEF		},
  { "POSIX2_SW_DEV",		SYSCONF,	_SC_2_SW_DEV		},
#if defined (_SC2_UPE)
  { "POSIX2_UPE",		SYSCONF,	_SC_2_UPE		},
#endif
#if !defined (_POSIX2_VERSION) && defined (_SC_2_VERSION)
  { "POSIX2_VERSION"		SYSCONF,	_SC_2_VERSION		},
#endif

  /* POSIX.1 Configurable System Variables */
  { "ARG_MAX",			SYSCONF,	_SC_ARG_MAX 		},
  { "CHILD_MAX",		SYSCONF,	_SC_CHILD_MAX		},
  { "CLK_TCK",			SYSCONF,	_SC_CLK_TCK		},
  { "NGROUPS_MAX",		SYSCONF,	_SC_NGROUPS_MAX		},
  { "OPEN_MAX",			SYSCONF,	_SC_OPEN_MAX		},
  { "STREAM_MAX",		SYSCONF,	_SC_STREAM_MAX		},
  { "TZNAME_MAX",		SYSCONF,	_SC_TZNAME_MAX		},
  { "_POSIX_JOB_CONTROL",	SYSCONF,	_SC_JOB_CONTROL 	},
  { "_POSIX_SAVED_IDS",		SYSCONF,	_SC_SAVED_IDS		},
  { "_POSIX_VERSION",		SYSCONF,	_SC_VERSION		},

  /* POSIX.1 Optional Facility Configuration Values */
#if defined (_SC_ASYNCHRONOUS_IO)
  { "_POSIX_ASYNCHRONOUS_IO",	SYSCONF,	_SC_ASYNCHRONOUS_IO	},
#endif
#if defined (_SC_FSYNC)
  { "_POSIX_FSYNC",		SYSCONF,	_SC_FSYNC		},
#endif
#if defined (_SC_MAPPED_FILES)
  { "_POSIX_MAPPED_FILES",	SYSCONF,	_SC_MAPPED_FILES	},
#endif
#if defined (_SC_MEMLOCK)
  { "_POSIX_MEMLOCK",		SYSCONF,	_SC_MEMLOCK		},
#endif
#if defined (_SC_MEMLOCK_RANGE)
  { "_POSIX_MEMLOCK_RANGE",	SYSCONF,	_SC_MEMLOCK_RANGE	},
#endif
#if defined (_SC_MEMORY_PROTECTION)
  { "_POSIX_MEMORY_PROTECTION",	SYSCONF,	_SC_MEMORY_PROTECTION	},
#endif
#if defined (_SC_MESSAGE_PASSING)
  { "_POSIX_MESSAGE_PASSING",	SYSCONF,	_SC_MESSAGE_PASSING	},
#endif
#if defined (SC_PRIORITIZED_IO)
  { "_POSIX_PRIORITIZED_IO",	SYSCONF,	_SC_PRIORITIZED_IO	},
#endif
#if defined (_SC_PRIORITY_SCHEDULING)
  { "_POSIX_PRIORITY_SCHEDULING", SYSCONF,	_SC_PRIORITY_SCHEDULING	},
#endif
#if defined (_SC_REALTIME_SIGNALS)
  { "_POSIX_REALTIME_SIGNALS",	SYSCONF,	_SC_REALTIME_SIGNALS	},
#endif
#if defined (_SC_SEMAPHORES)
  { "_POSIX_SEMAPHORES",	SYSCONF,	_SC_SEMAPHORES		},
#endif
#if defined (_SC_SHARED_MEMORY_OBJECTS)
  { "_POSIX_SHARED_MEMORY_OBJECTS", SYSCONF,	_SC_SHARED_MEMORY_OBJECTS },
#endif
#if defined (_SC_SYNCHRONIZED_IO)
  { "_POSIX_SYNCHRONIZED_IO",	SYSCONF,	_SC_SYNCHRONIZED_IO	},
#endif
#if defined (_SC_TIMERS)
  { "_POSIX_TIMERS",		SYSCONF,	_SC_TIMERS		},
#endif
#if defined (_SC_THREADS)
  { "_POSIX_THREADS",		SYSCONF,	_SC_THREADS		},
#endif
#if defined (_SC_THREADS)
  { "_POSIX_THREAD_ATTR_STACKADDR", SYSCONF,	_SC_THREAD_ATTR_STACKADDR },
#endif
#if defined (_SC_THREAD_ATTR_STACKSIZE)
  { "_POSIX_THREAD_ATTR_STACKSIZE", SYSCONF,	_SC_THREAD_ATTR_STACKSIZE },
#endif
#if defined (_SC_THREAD_PRIORITY_SCHEDULING)
  { "_POSIX_THREAD_PRIORITY_SCHEDULING", SYSCONF, _SC_THREAD_PRIORITY_SCHEDULING },
#endif
#if defined (_SC_THREAD_PRIO_INHERIT)
  { "_POSIX_THREAD_PRIO_INHERIT", SYSCONF,	_SC_THREAD_PRIO_INHERIT	},
#endif
#if defined (_SC_THREAD_PRIO_PROTECT)
  { "_POSIX_THREAD_PRIO_PROTECT", SYSCONF,	_SC_THREAD_PRIO_PROTECT	},
#endif
#if defined (_SC_THREAD_PROCESS_SHARED)
  { "_POSIX_THREAD_PROCESS_SHARED", SYSCONF,	_SC_THREAD_PROCESS_SHARED },
#endif
#if defined (_SC_THREAD_SAFE_FUNCTIONS)
  { "_POSIX_THREAD_SAFE_FUNCTIONS", SYSCONF,	_SC_THREAD_SAFE_FUNCTIONS },
#endif

  /* XPG 4.2 Configurable System Variables. */
#if defined (_SC_ATEXIT_MAX)
  { "ATEXIT_MAX",		SYSCONF,	_SC_ATEXIT_MAX		},
#endif
#if defined (_SC_IOV_MAX)
  { "IOV_MAX",			SYSCONF,	_SC_IOV_MAX		},
#endif
#if defined (_SC_PAGESIZE)
  { "PAGESIZE",			SYSCONF,	_SC_PAGESIZE		},
#endif
#if defined (_SC_PAGE_SIZE)
  { "PAGE_SIZE",		SYSCONF,	_SC_PAGE_SIZE		},
#endif

#if defined (_SC_AIO_LISTIO_MAX)
  { "AIO_LISTIO_MAX",		SYSCONF,	_SC_AIO_LISTIO_MAX	},
#endif
#if defined (_SC_AIO_MAX)
  { "AIO_MAX",			SYSCONF,	_SC_AIO_MAX		},
#endif
#if defined (_SC_AIO_PRIO_DELTA_MAX)
  { "AIO_PRIO_DELTA_MAX",	SYSCONF,	_SC_AIO_PRIO_DELTA_MAX	},
#endif
#if defined (_SC_DELAYTIMER_MAX)
  { "DELAYTIMER_MAX",		SYSCONF,	_SC_DELAYTIMER_MAX	},
#endif
#if defined (_SC_GETGR_R_SIZE_MAX)
  { "GETGR_R_SIZE_MAX",		SYSCONF,	_SC_GETGR_R_SIZE_MAX	},
#endif
#if defined (_SC_GETPW_R_SIZE_MAX)
  { "GETPW_R_SIZE_MAX",		SYSCONF,	_SC_GETPW_R_SIZE_MAX	},
#endif
#if defined (_SC_MQ_OPEN_MAX)
  { "MQ_OPEN_MAX",		SYSCONF,	_SC_MQ_OPEN_MAX		},
#endif
#if defined (_SC_MQ_PRIO_MAX)
  { "MQ_PRIO_MAX",		SYSCONF,	_SC_MQ_PRIO_MAX		},
#endif
#if defined (_SC_RTSIG_MAX)
  { "RTSIG_MAX",		SYSCONF,	_SC_RTSIG_MAX		},
#endif
#if defined (_SC_SEM_NSEMS_MAX)