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240 lines
8.7 KiB
240 lines
8.7 KiB
/* getconf.c - get configuration values
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*
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* Copyright 2017 Rob Landley <rob@landley.net>
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*
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* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/getconf.c
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*
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* Deviations from posix: no -v because nothing says what it should DO.
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* Added -l, what symbols should be included is a bit unclear.
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* Added -a, copied FSF behavior of assuming "/" if no path supplied.
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USE_GETCONF(NEWTOY(getconf, ">2al", TOYFLAG_USR|TOYFLAG_BIN))
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config GETCONF
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bool "getconf"
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default y
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help
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usage: getconf -a [PATH] | -l | NAME [PATH]
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Get system configuration values. Values from pathconf(3) require a path.
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-a Show all (defaults to "/" if no path given)
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-l List available value names (grouped by source)
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*/
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#define FOR_getconf
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#include "toys.h"
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#include <limits.h>
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// This is missing on glibc (bionic has it).
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#ifndef _SC_XOPEN_UUCP
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#define _SC_XOPEN_UUCP -1
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#endif
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#ifdef __APPLE__
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// macOS doesn't have a bunch of stuff. The actual macOS getconf says
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// "no such parameter", but -- unless proven otherwise -- it seems more useful
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// for portability if we act like we understood but say "undefined"?
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#define _SC_AVPHYS_PAGES -1
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#define _SC_THREAD_ROBUST_PRIO_INHERIT -1
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#define _SC_THREAD_ROBUST_PRIO_PROTECT -1
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#define _SC_UIO_MAXIOV -1
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#define _SC_V7_ILP32_OFF32 -1
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#define _SC_V7_ILP32_OFFBIG -1
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#define _SC_V7_LP64_OFF64 -1
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#define _SC_V7_LPBIG_OFFBIG -1
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#define _CS_V7_ENV -1
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#endif
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struct config {
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char *name;
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long long value;
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};
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// Lists of symbols getconf can query, broken down by whether we call sysconf(),
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// confstr(), or output the macro value directly.
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// Probe the live system
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struct config sysconfs[] = {
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/* POSIX */
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#define CONF(n) {"_POSIX_" #n,_SC_ ## n}
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CONF(ADVISORY_INFO), CONF(BARRIERS), CONF(ASYNCHRONOUS_IO),
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CONF(CLOCK_SELECTION), CONF(CPUTIME), CONF(FSYNC), CONF(IPV6),
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CONF(JOB_CONTROL), CONF(MAPPED_FILES), CONF(MEMLOCK), CONF(MEMLOCK_RANGE),
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CONF(MEMORY_PROTECTION), CONF(MESSAGE_PASSING), CONF(MONOTONIC_CLOCK),
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CONF(PRIORITY_SCHEDULING), CONF(RAW_SOCKETS), CONF(READER_WRITER_LOCKS),
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CONF(REALTIME_SIGNALS), CONF(REGEXP), CONF(SAVED_IDS), CONF(SEMAPHORES),
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CONF(SHARED_MEMORY_OBJECTS), CONF(SHELL), CONF(SPAWN), CONF(SPIN_LOCKS),
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CONF(SPORADIC_SERVER), CONF(SS_REPL_MAX), CONF(SYNCHRONIZED_IO),
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CONF(THREAD_ATTR_STACKADDR), CONF(THREAD_ATTR_STACKSIZE),
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CONF(THREAD_CPUTIME), CONF(THREAD_PRIO_INHERIT), CONF(THREAD_PRIO_PROTECT),
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CONF(THREAD_PRIORITY_SCHEDULING), CONF(THREAD_PROCESS_SHARED),
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CONF(THREAD_ROBUST_PRIO_INHERIT), CONF(THREAD_ROBUST_PRIO_PROTECT),
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CONF(THREAD_SAFE_FUNCTIONS), CONF(THREAD_SPORADIC_SERVER), CONF(THREADS),
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CONF(TIMEOUTS), CONF(TIMERS), CONF(TRACE), CONF(TRACE_EVENT_FILTER),
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CONF(TRACE_EVENT_NAME_MAX), CONF(TRACE_INHERIT), CONF(TRACE_LOG),
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CONF(TRACE_NAME_MAX), CONF(TRACE_SYS_MAX), CONF(TRACE_USER_EVENT_MAX),
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CONF(TYPED_MEMORY_OBJECTS), CONF(VERSION), CONF(V7_ILP32_OFF32),
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CONF(V7_ILP32_OFFBIG), CONF(V7_LP64_OFF64), CONF(V7_LPBIG_OFFBIG),
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/* POSIX.2 */
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#undef CONF
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#define CONF(n) {"POSIX2_" #n,_SC_2_ ## n}
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CONF(C_BIND), CONF(C_DEV), CONF(CHAR_TERM), CONF(FORT_DEV), CONF(FORT_RUN),
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CONF(LOCALEDEF), CONF(PBS), CONF(PBS_ACCOUNTING), CONF(PBS_CHECKPOINT),
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CONF(PBS_LOCATE), CONF(PBS_MESSAGE), CONF(PBS_TRACK), CONF(SW_DEV),
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CONF(UPE), CONF(VERSION),
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/* X/Open */
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#undef CONF
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#define CONF(n) {"_XOPEN_" #n,_SC_XOPEN_ ## n}
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CONF(CRYPT), CONF(ENH_I18N), CONF(REALTIME), CONF(REALTIME_THREADS),
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CONF(SHM), CONF(STREAMS), CONF(UNIX), CONF(UUCP), CONF(VERSION),
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/* No obvious standard */
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#undef CONF
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#define CONF(n) {#n,_SC_ ## n}
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CONF(AIO_LISTIO_MAX), CONF(AIO_MAX), CONF(AIO_PRIO_DELTA_MAX), CONF(ARG_MAX),
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CONF(ATEXIT_MAX), CONF(BC_BASE_MAX), CONF(BC_DIM_MAX), CONF(BC_SCALE_MAX),
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CONF(BC_STRING_MAX), CONF(CHILD_MAX), CONF(CLK_TCK), CONF(COLL_WEIGHTS_MAX),
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CONF(DELAYTIMER_MAX), CONF(EXPR_NEST_MAX), CONF(HOST_NAME_MAX),
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CONF(IOV_MAX), CONF(LINE_MAX), CONF(LOGIN_NAME_MAX), CONF(NGROUPS_MAX),
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CONF(MQ_OPEN_MAX), CONF(MQ_PRIO_MAX), CONF(OPEN_MAX), CONF(PAGE_SIZE),
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CONF(PAGESIZE), CONF(RAW_SOCKETS), CONF(RE_DUP_MAX), CONF(RTSIG_MAX),
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CONF(SEM_NSEMS_MAX), CONF(SEM_VALUE_MAX), CONF(SIGQUEUE_MAX),
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CONF(STREAM_MAX), CONF(SYMLOOP_MAX), CONF(TIMER_MAX), CONF(TTY_NAME_MAX),
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CONF(TZNAME_MAX), CONF(UIO_MAXIOV),
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/* Names that just don't match the symbol, do it by hand */
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{"_AVPHYS_PAGES", _SC_AVPHYS_PAGES}, {"_PHYS_PAGES", _SC_PHYS_PAGES},
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{"_NPROCESSORS_CONF", _SC_NPROCESSORS_CONF},
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{"_NPROCESSORS_ONLN", _SC_NPROCESSORS_ONLN},
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/* There's a weird "PTHREAD" vs "THREAD" mismatch here. */
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{"PTHREAD_DESTRUCTOR_ITERATIONS", _SC_THREAD_DESTRUCTOR_ITERATIONS},
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{"PTHREAD_KEYS_MAX", _SC_THREAD_KEYS_MAX},
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{"PTHREAD_STACK_MIN", _SC_THREAD_STACK_MIN},
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{"PTHREAD_THREADS_MAX", _SC_THREAD_THREADS_MAX},
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};
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// Probe the live system with a path
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struct config pathconfs[] = {
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#undef CONF
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#define CONF(n) {#n,_PC_ ## n}
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CONF(ASYNC_IO), CONF(CHOWN_RESTRICTED), CONF(FILESIZEBITS), CONF(LINK_MAX),
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CONF(MAX_CANON), CONF(MAX_INPUT), CONF(NAME_MAX), CONF(NO_TRUNC),
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CONF(PATH_MAX), CONF(PIPE_BUF), CONF(PRIO_IO), CONF(SYMLINK_MAX),
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CONF(SYNC_IO),
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{"_POSIX_VDISABLE", _PC_VDISABLE},
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};
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// Strings out of a header
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struct config confstrs[] = {
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#undef CONF
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#define CONF(n) {#n,_CS_ ## n}
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CONF(PATH), CONF(V7_ENV)
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};
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// Integers out of a header
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struct config limits[] = {
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#undef CONF
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#define CONF(n) {#n,n}
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CONF(_POSIX_AIO_LISTIO_MAX), CONF(_POSIX_AIO_MAX), CONF(_POSIX_ARG_MAX),
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CONF(_POSIX_CHILD_MAX), CONF(_POSIX_DELAYTIMER_MAX),
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CONF(_POSIX_HOST_NAME_MAX), CONF(_POSIX_LINK_MAX),
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CONF(_POSIX_LOGIN_NAME_MAX), CONF(_POSIX_MAX_CANON),
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CONF(_POSIX_MAX_INPUT), CONF(_POSIX_NAME_MAX), CONF(_POSIX_NGROUPS_MAX),
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CONF(_POSIX_OPEN_MAX), CONF(_POSIX_PATH_MAX), CONF(_POSIX_PIPE_BUF),
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CONF(_POSIX_RE_DUP_MAX), CONF(_POSIX_RTSIG_MAX), CONF(_POSIX_SEM_NSEMS_MAX),
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CONF(_POSIX_SEM_VALUE_MAX), CONF(_POSIX_SIGQUEUE_MAX), CONF(_POSIX_SSIZE_MAX),
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CONF(_POSIX_STREAM_MAX), CONF(_POSIX_SYMLINK_MAX), CONF(_POSIX_SYMLOOP_MAX),
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CONF(_POSIX_THREAD_DESTRUCTOR_ITERATIONS), CONF(_POSIX_THREAD_KEYS_MAX),
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CONF(_POSIX_THREAD_THREADS_MAX), CONF(_POSIX_TIMER_MAX),
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CONF(_POSIX_TTY_NAME_MAX), CONF(_POSIX_TZNAME_MAX),
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CONF(CHAR_MAX), CONF(CHAR_MIN), CONF(INT_MAX), CONF(INT_MIN), CONF(SCHAR_MAX),
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CONF(SCHAR_MIN), CONF(SHRT_MAX), CONF(SHRT_MIN), CONF(SSIZE_MAX),
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CONF(UCHAR_MAX), CONF(UINT_MAX), CONF(ULONG_MAX), CONF(USHRT_MAX),
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CONF(CHAR_BIT),
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/* Not available in glibc without _GNU_SOURCE. */
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{"LONG_BIT", 8*sizeof(long)},
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{"WORD_BIT", 8*sizeof(int)},
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#undef CONF
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#define CONF(n) {#n,_ ## n}
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CONF(POSIX2_BC_BASE_MAX), CONF(POSIX2_BC_DIM_MAX),
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CONF(POSIX2_BC_SCALE_MAX), CONF(POSIX2_BC_STRING_MAX),
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CONF(POSIX2_CHARCLASS_NAME_MAX), CONF(POSIX2_COLL_WEIGHTS_MAX),
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CONF(POSIX2_EXPR_NEST_MAX), CONF(POSIX2_LINE_MAX), CONF(POSIX2_RE_DUP_MAX),
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};
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// Names we need to handle ourselves (default to blank but shouldn't error)
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struct config others[] = {
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{"LFS_CFLAGS", 0}, {"LFS_LDFLAGS", 0}, {"LFS_LIBS", 0}
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};
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static void show_conf(int i, struct config *c, const char *path)
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{
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if (i<2) {
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long l = i ? pathconf(path, c->value) : sysconf(c->value);
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if (l == -1) puts("undefined");
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else printf("%ld\n", l);
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} else if (i==2) {
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confstr(c->value, toybuf, sizeof(toybuf));
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puts(toybuf);
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} else if (i==3) printf("%lld\n", c->value);
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// LFS_CFLAGS on 32 bit should enable Large File Support for kernel builds
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else puts(sizeof(long)==4 && !strcmp(c->name, "LFS_CFLAGS") ?
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"-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" : "");
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}
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void getconf_main(void)
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{
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struct config *configs[] = {sysconfs, pathconfs, confstrs, limits, others},
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*c = NULL;
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int i, j, lens[] = {ARRAY_LEN(sysconfs), ARRAY_LEN(pathconfs),
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ARRAY_LEN(confstrs), ARRAY_LEN(limits), ARRAY_LEN(others)};
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char *name, *path = (toys.optc==2) ? toys.optargs[1] : "/",
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*config_names[] = {"sysconf(3)", "pathconf(3)", "confstr(3)",
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"<limits.h>", "Misc"};
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if (toys.optflags&FLAG_a) {
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for (i = 0; i<5; i++) {
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for (j = 0; j<lens[i]; j++) {
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c = &configs[i][j];
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printf("%-34s ", c->name);
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show_conf(i, c, path);
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}
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}
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return;
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}
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if (toys.optflags&FLAG_l) {
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for (i = 0; i<5; i++) {
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printf("%s\n", config_names[i]);
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for (j = 0; j<lens[i]; j++) printf(" %s\n", configs[i][j].name);
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}
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return;
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}
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if (toys.optc<1) help_exit(0);
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name = *toys.optargs;
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// Workaround for autogen using CS_PATH instead of PATH
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if (!strcmp("CS_PATH", name)) name += 3;
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// Find the config.
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for (i = j = 0; ; j++) {
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if (j==lens[i]) j = 0, i++;
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if (i==5) error_exit("bad '%s'", name);
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c = &configs[i][j];
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if (!strcmp(c->name, name)) break;
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}
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// Check that we do/don't have the extra path argument.
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if (i==1) {
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if (toys.optc!=2) help_exit("%s needs a path", name);
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} else if (toys.optc!=1) help_exit("%s does not take a path", name);
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show_conf(i, c, path);
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}
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