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