/* 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 // When NDK r19 ships in 2018Q4, switch to _SC_UIO_MAXIOV. // (Until then use this workaround for musl.) #ifndef UIO_MAXIOV #define UIO_MAXIOV 1024 #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_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 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), /* 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 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 struct config confstrs[] = { #undef CONF #define CONF(n) {#n,_CS_ ## n} CONF(PATH), CONF(V7_ENV) }; // Integers out of a header 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(UIO_MAXIOV), 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) 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); }