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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
USE_GETCONF(NEWTOY(getconf, ">2l", TOYFLAG_USR|TOYFLAG_BIN))
config GETCONF
bool "getconf"
default y
help
usage: getconf -l | NAME [PATH]
Get system configuration values. Values from pathconf(3) require a path.
-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
// This is missing on musl 1.1.20
#ifndef UIO_MAXIOV
#define UIO_MAXIOV 1024
#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}
};
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, *config_names[] = {"sysconf(3)", "pathconf(3)", "confstr(3)",
"<limits.h>", "Misc"};
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);
if (i<2) {
long l = i ? pathconf(toys.optargs[1], c->value) : sysconf(c->value);
if (l == -1) puts("undefined");
else printf("%ld\n", l);
} else if (i==1) printf("%ld\n", pathconf(toys.optargs[1], c->value));
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 (kernel build cares)
else if (sizeof(long)==4 && !j)
puts("-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64");
}
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