434 lines
10 KiB
C
434 lines
10 KiB
C
/* $Id$ */
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/* Copyright (c) 2020 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS Unix utils */
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <limits.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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/* constants */
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#ifndef PROGNAME
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# define PROGNAME "getconf"
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#endif
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/* getconf */
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/* private */
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/* types */
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typedef struct _getconf_catalog
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{
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long name;
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char const * string;
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} getconf_catalog;
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/* constants */
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static const getconf_catalog _getconf_catalog_confstr[] =
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{
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#ifdef _CS_PATH
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{ _CS_PATH, "_CS_PATH" },
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#endif
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};
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static const getconf_catalog _getconf_catalog_pathconf[] =
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{
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#ifdef _PC_2_SYMLINKS
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{ _PC_2_SYMLINKS, "POSIX2_SYMLINKS" },
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#endif
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#ifdef _PC_ALLOC_SIZE_MIN
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{ _PC_ALLOC_SIZE_MIN, "POSIX_ALLOC_SIZE_MIN" },
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#endif
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#ifdef _PC_ASYNC_IO
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{ _PC_ASYNC_IO, "_POSIX_ASYNC_IO" },
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#endif
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#ifdef _PC_CHOWN_RESTRICTED
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{ _PC_CHOWN_RESTRICTED, "POSIX_CHOWN_RESTRICTED" },
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#endif
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#ifdef _PC_FILESIZEBITS
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{ _PC_FILESIZEBITS, "FILESIZEBITS" },
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#endif
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#ifdef _PC_LINK_MAX
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{ _PC_LINK_MAX, "LINK_MAX" },
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#endif
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#ifdef _PC_MAX_CANON
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{ _PC_MAX_CANON, "MAX_CANON" },
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#endif
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#ifdef _PC_MAX_INPUT
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{ _PC_MAX_INPUT, "MAX_INPUT" },
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#endif
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#ifdef _PC_NAME_MAX
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{ _PC_NAME_MAX, "NAME_MAX" },
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#endif
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#ifdef _PC_NO_TRUNC
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{ _PC_NO_TRUNC, "POSIX_NO_TRUNC" },
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#endif
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#ifdef _PC_PATH_MAX
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{ _PC_PATH_MAX, "PATH_MAX" },
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#endif
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#ifdef _PC_PIPE_BUF
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{ _PC_PIPE_BUF, "PIPE_BUF" },
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#endif
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#ifdef _PC_PRIO_IO
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{ _PC_PRIO_IO, "_POSIX_PRIO_IO" },
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#endif
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#ifdef _PC_REC_INCR_XFER_SIZE
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{ _PC_REC_INCR_XFER_SIZE, "POSIX_REC_INCR_XFER_SIZE" },
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#endif
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#ifdef _PC_REC_MAX_XFER_SIZE
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{ _PC_REC_MAX_XFER_SIZE, "POSIX_REC_MAX_XFER_SIZE" },
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#endif
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#ifdef _PC_REC_MIN_XFER_SIZE
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{ _PC_REC_MIN_XFER_SIZE, "POSIX_REC_MIN_XFER_SIZE" },
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#endif
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#ifdef _PC_REC_XFER_ALIGN
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{ _PC_REC_XFER_ALIGN, "POSIX_REC_XFER_ALIGN" },
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#endif
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#ifdef _PC_SYMLINK_MAX
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{ _PC_SYMLINK_MAX, "SYMLINK_MAX" },
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#endif
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#ifdef _PC_SYNC_IO
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{ _PC_SYNC_IO, "_POSIX_SYNC_IO" },
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#endif
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#ifdef _PC_TIMESTAMP_RESOLUTION
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{ _PC_TIMESTAMP_RESOLUTION, "_POSIX_TIMESTAMP_RESOLUTION" },
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#endif
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#ifdef _PC_VDISABLE
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{ _PC_VDISABLE, "_POSIX_VDISABLE" },
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#endif
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};
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static const getconf_catalog _getconf_catalog_sysconf[] =
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{
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#ifdef _SC_2_C_BIND
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{ _SC_2_C_BIND, "_POSIX2_C_BIND" },
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#endif
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#ifdef _SC_2_C_DEV
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{ _SC_2_C_DEV, "_POSIX2_C_DEV" },
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#endif
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#ifdef _SC_2_CHAR_TERM
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{ _SC_2_CHAR_TERM, "_POSIX2_CHAR_TERM" },
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#endif
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#ifdef _SC_2_FORT_DEV
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{ _SC_2_FORT_DEV, "_POSIX2_FORT_DEV" },
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#endif
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#ifdef _SC_2_FORT_RUN
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{ _SC_2_FORT_RUN, "_POSIX2_FORT_RUN" },
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#endif
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#ifdef _SC_2_LOCALEDEF
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{ _SC_2_LOCALEDEF, "_POSIX2_LOCALEDEF" },
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#endif
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#ifdef _SC_2_PBS
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{ _SC_2_PBS, "_POSIX2_PBS" },
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#endif
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#ifdef _SC_2_PBS_ACCOUNTING
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{ _SC_2_PBS_ACCOUNTING, "_POSIX2_PBS_ACCOUNTING" },
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#endif
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#ifdef _SC_2_PBS_CHECKPOINT
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{ _SC_2_PBS_CHECKPOINT, "_POSIX2_PBS_CHECKPOINT" },
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#endif
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#ifdef _SC_2_PBS_LOCATE
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{ _SC_2_PBS_LOCATE, "_POSIX2_PBS_LOCATE" },
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#endif
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#ifdef _SC_2_PBS_MESSAGE
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{ _SC_2_PBS_MESSAGE, "_POSIX2_PBS_MESSAGE" },
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#endif
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#ifdef _SC_2_PBS_TRACK
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{ _SC_2_PBS_TRACK, "_POSIX2_PBS_TRACK" },
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#endif
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#ifdef _SC_2_SW_DEV
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{ _SC_2_SW_DEV, "_POSIX2_SW_DEV" },
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#endif
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#ifdef _SC_2_UPE
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{ _SC_2_UPE, "_POSIX2_UPE" },
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#endif
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#ifdef _SC_2_VERSION
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{ _SC_2_VERSION, "_POSIX2_VERSION" },
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#endif
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#ifdef _SC_AIO_LISTIO_MAX
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{ _SC_AIO_LISTIO_MAX, "AIO_LISTIO_MAX" },
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#endif
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#ifdef _SC_AIO_MAX
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{ _SC_AIO_MAX, "AIO_MAX" },
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#endif
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#ifdef _SC_ARG_MAX
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{ _SC_ARG_MAX, "ARG_MAX" },
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#endif
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#ifdef _SC_ATEXIT_MAX
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{ _SC_ATEXIT_MAX, "ATEXIT_MAX" },
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#endif
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#ifdef _SC_CHILD_MAX
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{ _SC_CHILD_MAX, "CHILD_MAX" },
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#endif
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#ifdef _SC_DELAYTIMER_MAX
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{ _SC_DELAYTIMER_MAX, "DELAYTIMER_MAX" },
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#endif
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#ifdef _SC_EXPR_NEST_MAX
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{ _SC_EXPR_NEST_MAX, "EXPR_NEST_MAX" },
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#endif
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#ifdef _SC_HOST_NAME_MAX
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{ _SC_HOST_NAME_MAX, "HOST_NAME_MAX" },
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#endif
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#ifdef _SC_IOV_MAX
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{ _SC_IOV_MAX, "IOV_MAX" },
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#endif
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#ifdef _SC_LINE_MAX
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{ _SC_LINE_MAX, "LINE_MAX" },
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#endif
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#ifdef _SC_LOGIN_NAME_MAX
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{ _SC_LOGIN_NAME_MAX, "LOGIN_NAME_MAX" },
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#endif
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#ifdef _SC_NGROUPS_MAX
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{ _SC_NGROUPS_MAX, "NGROUPS_MAX" },
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#endif
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#ifdef _SC_OPEN_MAX
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{ _SC_OPEN_MAX, "OPEN_MAX" },
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#endif
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#ifdef _SC_PAGE_SIZE
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{ _SC_PAGE_SIZE, "PAGE_SIZE" },
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#endif
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#ifdef _SC_PAGESIZE
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{ _SC_PAGESIZE, "PAGESIZE" },
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#endif
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#ifdef _SC_STREAM_MAX
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{ _SC_STREAM_MAX, "STREAM_MAX" },
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#endif
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#ifdef _SC_SYMLOOP_MAX
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{ _SC_SYMLOOP_MAX, "SYMLOOP_MAX" },
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#endif
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#ifdef _SC_TIMER_MAX
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{ _SC_TIMER_MAX, "TIMER_MAX" },
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#endif
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#ifdef _SC_TTYNAME_MAX
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{ _SC_TTYNAME_MAX, "TTYNAME_MAX" },
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#endif
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#ifdef _SC_TZNAME_MAX
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{ _SC_TZNAME_MAX, "TZNAME_MAX" },
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#endif
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};
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static const getconf_catalog _getconf_catalog_values[] =
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{
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#ifdef _POSIX2_BC_BASE_MAX
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{ _POSIX2_BC_BASE_MAX, "POSIX2_BC_BASE_MAX" },
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#endif
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#ifdef _POSIX2_BC_DIM_MAX
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{ _POSIX2_BC_DIM_MAX, "POSIX2_BC_DIM_MAX" },
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#endif
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#ifdef _POSIX2_BC_SCALE_MAX
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{ _POSIX2_BC_SCALE_MAX, "POSIX2_BC_SCALE_MAX" },
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#endif
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#ifdef _POSIX2_BC_STRING_MAX
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{ _POSIX2_BC_STRING_MAX, "POSIX2_BC_STRING_MAX" },
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#endif
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#ifdef _POSIX2_C_BIND
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{ _POSIX2_C_BIND, "POSIX2_C_BIND" },
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#endif
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#ifdef _POSIX2_C_DEV
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{ _POSIX2_C_DEV, "POSIX2_C_DEV" },
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#endif
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#ifdef _POSIX2_CHAR_TERM
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{ _POSIX2_CHAR_TERM, "POSIX2_CHAR_TERM" },
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#endif
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#ifdef _POSIX2_COLL_WEIGHTS_MAX
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{ _POSIX2_COLL_WEIGHTS_MAX, "POSIX2_COLL_WEIGHTS_MAX" },
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#endif
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#ifdef _POSIX2_EXPR_NEST_MAX
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{ _POSIX2_EXPR_NEST_MAX, "POSIX2_EXPR_NEST_MAX" },
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#endif
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#ifdef _POSIX2_FORT_DEV
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{ _POSIX2_FORT_DEV, "POSIX2_FORT_DEV" },
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#endif
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#ifdef _POSIX2_FORT_RUN
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{ _POSIX2_FORT_RUN, "POSIX2_FORT_RUN" },
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#endif
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#ifdef _POSIX2_LINE_MAX
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{ _POSIX2_LINE_MAX, "POSIX2_LINE_MAX" },
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#endif
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#ifdef _POSIX2_LOCALEDEF
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{ _POSIX2_LOCALEDEF, "POSIX2_LOCALEDEF" },
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#endif
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#ifdef _POSIX2_RE_DUP_MAX
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{ _POSIX2_RE_DUP_MAX, "POSIX2_RE_DUP_MAX" },
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#endif
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#ifdef _POSIX2_SW_DEV
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{ _POSIX2_SW_DEV, "POSIX2_SW_DEV" },
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#endif
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#ifdef _POSIX2_UPE
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{ _POSIX2_UPE, "POSIX2_UPE" },
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#endif
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#ifdef _POSIX2_VERSION
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{ _POSIX2_VERSION, "POSIX2_VERSION" },
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#endif
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};
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/* prototypes */
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static int _getconf(char const * specification, char const * var,
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char const * path);
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static int _getconf_error(char const * message, int ret);
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static int _usage(void);
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/* functions */
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/* getconf */
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static int _getconf_confstr(char const * var);
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static int _getconf_pathconf(char const * var, char const * path);
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static int _getconf_sysconf(char const * var);
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static int _getconf_values(char const * var);
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static int _getconf(char const * specification, char const * var,
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char const * path)
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{
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if(path != NULL)
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return _getconf_pathconf(var, path);
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if(strncmp(var, "_SC_", 4) == 0)
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return _getconf_confstr(var);
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return _getconf_sysconf(var);
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}
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static int _getconf_confstr(char const * var)
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{
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size_t i;
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size_t cnt = sizeof(_getconf_catalog_confstr)
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/ sizeof(*_getconf_catalog_confstr);
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char * buf;
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for(i = 0; i < cnt; i++)
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if(strcmp(_getconf_catalog_confstr[i].string, var) == 0)
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break;
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if(i == cnt)
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return _getconf_error(var, -ENOENT);
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/* obtain the required size */
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if((cnt = confstr(_getconf_catalog_confstr[i].name, NULL, 0)) == 0)
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return _getconf_error(var, 2);
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if((buf = malloc(cnt)) == NULL)
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return _getconf_error(var, 2);
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if((cnt = confstr(_getconf_catalog_confstr[i].name, buf, cnt)) == 0)
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{
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free(buf);
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return _getconf_error(var, 2);
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}
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printf("%s\n", buf);
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free(buf);
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return 0;
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}
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static int _getconf_pathconf(char const * var, char const * path)
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{
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size_t i;
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size_t cnt = sizeof(_getconf_catalog_pathconf)
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/ sizeof(*_getconf_catalog_pathconf);
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long value;
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for(i = 0; i < cnt; i++)
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if(strcmp(_getconf_catalog_pathconf[i].string, var) == 0)
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break;
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if(i == cnt)
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return _getconf_error(var, -ENOENT);
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if((value = pathconf(path, _getconf_catalog_pathconf[i].name)) < 0)
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return _getconf_error(var, 2);
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printf("%ld\n", value);
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return 0;
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}
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static int _getconf_sysconf(char const * var)
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{
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size_t i;
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size_t cnt = sizeof(_getconf_catalog_sysconf)
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/ sizeof(*_getconf_catalog_sysconf);
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long value;
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for(i = 0; i < cnt; i++)
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if(strcmp(_getconf_catalog_sysconf[i].string, var) == 0)
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break;
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if(i == cnt)
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return _getconf_values(var);
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errno = 0;
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if((value = sysconf(_getconf_catalog_sysconf[i].name)) < 0)
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{
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if(errno != 0)
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return _getconf_error(var, 2);
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printf("%s", "undefined\n");
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}
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else
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printf("%ld\n", value);
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return 0;
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}
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static int _getconf_values(char const * var)
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{
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size_t i;
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size_t cnt = sizeof(_getconf_catalog_values)
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/ sizeof(*_getconf_catalog_values);
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for(i = 0; i < cnt; i++)
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if(strcmp(_getconf_catalog_values[i].string, var) == 0)
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break;
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if(i == cnt)
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return _getconf_error(var, -ENOENT);
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printf("%ld\n", _getconf_catalog_values[i].name);
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return 0;
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}
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/* error */
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static int _getconf_error(char const * message, int ret)
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{
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fputs(PROGNAME ": ", stderr);
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if(ret < 0)
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{
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fprintf(stderr, "%s%s%s\n", (message != NULL) ? message : "",
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(message != NULL) ? ": " : "", strerror(-ret));
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return -ret;
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}
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perror(message);
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return ret;
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}
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/* usage */
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static int _usage(void)
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{
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fputs("Usage: " PROGNAME " [-v specification] system_var\n"
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" " PROGNAME " [-v specification] path_var pathname\n", stderr);
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return 1;
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}
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/* main */
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int main(int argc, char * argv[])
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{
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int o;
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char const * specification = NULL;
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while((o = getopt(argc, argv, "v:")) != -1)
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switch(o)
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{
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case 'v':
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specification = optarg;
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break;
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default:
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return _usage();
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}
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if(optind + 1 != argc && optind + 2 != argc)
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return _usage();
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return (_getconf(specification, argv[optind], argv[optind + 1]) == 0)
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? 0 : 2;
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}
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