1 /* Copyright (C) 1991,1993,1995-1997,2000
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 see <http://www.gnu.org/licenses/>. */
19 #define _XOPEN_SOURCE 500
31 #include <sys/syscall.h>
32 #include <sys/sysinfo.h>
33 #include <sys/types.h>
34 #include <sys/param.h>
35 #ifdef __UCLIBC_HAS_REGEX__
38 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
41 #include <sys/resource.h>
44 #include "internal/parse_config.h"
46 static int nprocessors_onln(void)
49 parser_t *p = config_open("/proc/stat");
53 while (config_read(p, &l, 2, 1, " ", 0))
59 } else if ((p = config_open("/proc/cpuinfo"))) {
61 while (config_read(p, &l, 2, 2, "\0:", PARSE_NORMAL))
62 if (strncmp("ncpus active", l[0], 12) == 0) {
67 while (config_read(p, &l, 2, 2, "\0:\t", PARSE_NORMAL))
68 if (strcmp("processor", l[0]) == 0)
73 return ret != 0 ? ret : 1;
76 #if defined __UCLIBC__ && !defined __UCLIBC_HAS_LFS__
77 # define readdir64 readdir
78 # define dirent64 dirent
80 static int nprocessors_conf(void)
83 DIR *dir = opendir("/sys/devices/system/cpu");
88 while ((dp = readdir64(dir))) {
89 if (dp->d_type == DT_DIR
90 && dp->d_name[0] == 'c'
91 && dp->d_name[1] == 'p'
92 && dp->d_name[2] == 'u'
93 && isdigit(dp->d_name[3]))
101 parser_t *p = config_open("/proc/stat");
102 while (config_read(p, &l, 2, 2, "\0:", PARSE_NORMAL))
103 if (strncmp("ncpus probed", l[0], 13) == 0) {
109 ret = nprocessors_onln();
112 return ret != 0 ? ret : 1;
116 #ifndef __UCLIBC_CLK_TCK_CONST
117 #error __UCLIBC_CLK_TCK_CONST not defined!
120 /***********************************************************************/
122 * Manuel Novoa III Jan 2001
124 * On i386, the switch-based implementation generates 796 bytes of code.
125 * However, many of the return values are repeats. By collecting these
126 * repeats and moving to a table-based implementation, we generate 283
127 * bytes on i386 (-Os -fomit-frame-pointer).
130 #ifdef _UCLIBC_GENERATE_SYSCONF_ARCH
132 * Set some errno's so the auto-gen code knows what it is dealing with.
133 * 1) ENOSYS signifies that we're returning a default value.
134 * This is just extra info for development.
135 * 2) EISNAM signifies that the value returned varies at runtime.
137 * Option: GETPAGESIZE_IS_DYNAMIC
138 * The current implementation of getpagesize in uClibc returns
139 * a constant. The pagesize on the target arch should not vary,
140 * so it should be safe to set this as 0.
142 #define RETURN_NEG_1 __set_errno(ENOSYS); return -1
143 #define RETURN_FUNCTION(f) __set_errno(EISNAM); return (long int) #f
144 #define GETPAGESIZE_IS_DYNAMIC 0
146 #define RETURN_NEG_1 return -1
147 #define RETURN_FUNCTION(f) return f;
148 #endif /* _UCLIBC_GENERATE_SYSCONF_ARCH */
150 /* Legacy value of ARG_MAX. The macro is now not defined since the
151 actual value varies based on the stack size. */
152 #define legacy_ARG_MAX 131072
154 /* Get the value of the system variable NAME. */
155 long int sysconf(int name)
157 struct rlimit rlimit;
166 /* Use getrlimit to get the stack limit. */
167 if (getrlimit (RLIMIT_STACK, &rlimit) == 0)
168 return MAX (legacy_ARG_MAX, rlimit.rlim_cur / 4);
172 return legacy_ARG_MAX;
183 /* Can't use CLK_TCK here since that calls __sysconf(_SC_CLK_TCK) */
184 return __UCLIBC_CLK_TCK_CONST;
186 case _SC_NGROUPS_MAX:
194 RETURN_FUNCTION(getdtablesize());
204 return _POSIX_TZNAME_MAX;
206 case _SC_JOB_CONTROL:
207 #ifdef _POSIX_JOB_CONTROL
214 #ifdef _POSIX_SAVED_IDS
220 case _SC_REALTIME_SIGNALS:
221 #ifdef _POSIX_REALTIME_SIGNALS
227 case _SC_PRIORITY_SCHEDULING:
228 #ifdef _POSIX_PRIORITY_SCHEDULING
241 case _SC_ASYNCHRONOUS_IO:
242 #ifdef _POSIX_ASYNCHRONOUS_IO
248 case _SC_PRIORITIZED_IO:
249 #ifdef _POSIX_PRIORITIZED_IO
255 case _SC_SYNCHRONIZED_IO:
256 #ifdef _POSIX_SYNCHRONIZED_IO
269 case _SC_MAPPED_FILES:
270 #ifdef _POSIX_MAPPED_FILES
277 #ifdef _POSIX_MEMLOCK
283 case _SC_MEMLOCK_RANGE:
284 #ifdef _POSIX_MEMLOCK_RANGE
290 case _SC_MEMORY_PROTECTION:
291 #ifdef _POSIX_MEMORY_PROTECTION
297 case _SC_MESSAGE_PASSING:
298 #ifdef _POSIX_MESSAGE_PASSING
305 #ifdef _POSIX_SEMAPHORES
311 case _SC_SHARED_MEMORY_OBJECTS:
312 #ifdef _POSIX_SHARED_MEMORY_OBJECTS
319 return _POSIX_VERSION;
322 #if defined(GETPAGESIZE_IS_DYNAMIC) && (GETPAGESIZE_IS_DYNAMIC == 1)
323 RETURN_FUNCTION(getpagesize());
325 return getpagesize(); /* note: currently this is not dynamic */
328 case _SC_AIO_LISTIO_MAX:
329 #ifdef AIO_LISTIO_MAX
330 return AIO_LISTIO_MAX;
342 case _SC_AIO_PRIO_DELTA_MAX:
343 #ifdef AIO_PRIO_DELTA_MAX
344 return AIO_PRIO_DELTA_MAX;
349 case _SC_DELAYTIMER_MAX:
350 #ifdef DELAYTIMER_MAX
351 return DELAYTIMER_MAX;
356 case _SC_MQ_OPEN_MAX:
363 case _SC_MQ_PRIO_MAX:
377 case _SC_SEM_NSEMS_MAX:
379 return SEM_NSEMS_MAX;
384 case _SC_SEM_VALUE_MAX:
386 return SEM_VALUE_MAX;
391 case _SC_SIGQUEUE_MAX:
405 case _SC_BC_BASE_MAX:
419 case _SC_BC_SCALE_MAX:
426 case _SC_BC_STRING_MAX:
428 return BC_STRING_MAX;
433 case _SC_COLL_WEIGHTS_MAX:
434 #ifdef COLL_WEIGHTS_MAX
435 return COLL_WEIGHTS_MAX;
440 case _SC_EQUIV_CLASS_MAX:
441 #ifdef EQUIV_CLASS_MAX
442 return EQUIV_CLASS_MAX;
447 case _SC_EXPR_NEST_MAX:
449 return EXPR_NEST_MAX;
468 case _SC_CHARCLASS_NAME_MAX:
469 #ifdef CHARCLASS_NAME_MAX
470 return CHARCLASS_NAME_MAX;
483 #ifdef _POSIX_PII_XTI
490 #ifdef _POSIX_PII_SOCKET
496 case _SC_PII_INTERNET:
497 #ifdef _POSIX_PII_INTERNET
504 #ifdef _POSIX_PII_OSI
531 case _SC_PII_INTERNET_STREAM:
532 #ifdef _POSIX_PII_INTERNET_STREAM
538 case _SC_PII_INTERNET_DGRAM:
539 #ifdef _POSIX_PII_INTERNET_DGRAM
545 case _SC_PII_OSI_COTS:
546 #ifdef _POSIX_PII_OSI_COTS
552 case _SC_PII_OSI_CLTS:
553 #ifdef _POSIX_PII_OSI_CLTS
560 #ifdef _POSIX_PII_OSI_M
574 return _POSIX2_VERSION;
577 #ifdef _POSIX2_C_BIND
578 return _POSIX2_C_BIND;
585 return _POSIX2_C_DEV;
590 case _SC_2_C_VERSION:
591 #ifdef _POSIX2_C_VERSION
592 return _POSIX2_C_VERSION;
598 #ifdef _POSIX2_FORT_DEV
599 return _POSIX2_FORT_DEV;
605 #ifdef _POSIX2_FORT_RUN
606 return _POSIX2_FORT_RUN;
611 case _SC_2_LOCALEDEF:
612 #ifdef _POSIX2_LOCALEDEF
613 return _POSIX2_LOCALEDEF;
619 #ifdef _POSIX2_SW_DEV
620 return _POSIX2_SW_DEV;
625 case _SC_2_CHAR_TERM:
626 #ifdef _POSIX2_CHAR_TERM
627 return _POSIX2_CHAR_TERM;
639 /* POSIX 1003.1c (POSIX Threads). */
641 #ifdef __UCLIBC_HAS_THREADS__
647 case _SC_THREAD_SAFE_FUNCTIONS:
648 #ifdef __UCLIBC_HAS_THREADS__
654 /* If you change these, also change libc/pwd_grp/pwd_grp.c to match */
655 case _SC_GETGR_R_SIZE_MAX:
656 return __UCLIBC_GRP_BUFFER_SIZE__;
658 case _SC_GETPW_R_SIZE_MAX:
659 return __UCLIBC_PWD_BUFFER_SIZE__;
661 /* getlogin() is a worthless interface. In uClibc we let the user specify
662 * whatever they want via the LOGNAME environment variable, or we return NULL
663 * if getenv() fails to find anything. So this is merely how large a env
664 * variable can be. Lets use 256 */
665 case _SC_LOGIN_NAME_MAX:
668 /* If you change this, also change _SC_TTY_NAME_MAX in libc/unistd/sysconf.c */
669 #define TTYNAME_BUFLEN 32
670 case _SC_TTY_NAME_MAX:
671 return TTYNAME_BUFLEN;
673 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
674 #ifdef _POSIX_THREAD_DESTRUCTOR_ITERATIONS
675 return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
680 case _SC_THREAD_KEYS_MAX:
681 #ifdef PTHREAD_KEYS_MAX
682 return PTHREAD_KEYS_MAX;
687 case _SC_THREAD_STACK_MIN:
688 #ifdef PTHREAD_STACK_MIN
689 return PTHREAD_STACK_MIN;
694 case _SC_THREAD_THREADS_MAX:
695 #ifdef PTHREAD_THREADS_MAX
696 return PTHREAD_THREADS_MAX;
701 case _SC_THREAD_ATTR_STACKADDR:
702 #ifdef _POSIX_THREAD_ATTR_STACKADDR
708 case _SC_THREAD_ATTR_STACKSIZE:
709 #ifdef _POSIX_THREAD_ATTR_STACKSIZE
715 case _SC_THREAD_PRIORITY_SCHEDULING:
716 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
722 case _SC_THREAD_PRIO_INHERIT:
723 #ifdef _POSIX_THREAD_PRIO_INHERIT
729 case _SC_THREAD_PRIO_PROTECT:
730 #ifdef _POSIX_THREAD_PRIO_PROTECT
736 case _SC_THREAD_PROCESS_SHARED:
737 #ifdef _POSIX_THREAD_PROCESS_SHARED
743 case _SC_NPROCESSORS_CONF:
744 RETURN_FUNCTION(nprocessors_conf());
746 case _SC_NPROCESSORS_ONLN:
747 RETURN_FUNCTION(nprocessors_onln());
751 RETURN_FUNCTION(get_phys_pages());
756 case _SC_AVPHYS_PAGES:
758 RETURN_FUNCTION(get_avphys_pages());
764 return __UCLIBC_MAX_ATEXIT;
767 /* We have no limit but since the return value might be used to
768 allocate a buffer we restrict the value. */
771 case _SC_XOPEN_VERSION:
772 return _XOPEN_VERSION;
774 case _SC_XOPEN_XCU_VERSION:
775 return _XOPEN_XCU_VERSION;
780 case _SC_XOPEN_CRYPT:
787 case _SC_XOPEN_ENH_I18N:
788 #ifdef _XOPEN_ENH_I18N
789 return _XOPEN_ENH_I18N;
838 return sizeof (long int) * CHAR_BIT;
841 return sizeof (int) * CHAR_BIT;
850 return _POSIX_SSIZE_MAX;
918 case _SC_XBS5_ILP32_OFF32:
919 #ifdef _XBS5_ILP32_OFF32
920 return _XBS5_ILP32_OFF32;
924 case _SC_XBS5_ILP32_OFFBIG:
925 #ifdef _XBS5_ILP32_OFFBIG
926 return _XBS5_ILP32_OFFBIG;
930 case _SC_XBS5_LP64_OFF64:
931 #ifdef _XBS5_LP64_OFF64
932 return _XBS5_LP64_OFF64;
936 case _SC_XBS5_LPBIG_OFFBIG:
937 #ifdef _XBS5_LPBIG_OFFBIG
938 return _XBS5_LPBIG_OFFBIG;
942 case _SC_V7_ILP32_OFF32:
943 #ifdef _POSIX_V7_ILP32_OFF32
944 return _POSIX_V7_ILP32_OFF32;
948 case _SC_V7_ILP32_OFFBIG:
949 #ifdef _POSIX_V7_ILP32_OFFBIG
950 return _POSIX_V7_ILP32_OFFBIG;
954 case _SC_V7_LP64_OFF64:
955 #ifdef _POSIX_V7_LP64_OFF64
956 return _POSIX_V7_LP64_OFF64;
960 case _SC_V7_LPBIG_OFFBIG:
961 #ifdef _POSIX_V7_LPBIG_OFFBIG
962 return _POSIX_V7_LPBIG_OFFBIG;
967 case _SC_XOPEN_LEGACY:
968 return _XOPEN_LEGACY;
970 case _SC_XOPEN_REALTIME:
971 #ifdef _XOPEN_REALTIME
972 return _XOPEN_REALTIME;
976 case _SC_XOPEN_REALTIME_THREADS:
977 #ifdef _XOPEN_REALTIME_THREADS
978 return _XOPEN_REALTIME_THREADS;
983 case _SC_MONOTONIC_CLOCK:
984 #if defined __UCLIBC_HAS_REALTIME__ && defined __NR_clock_getres
985 if (clock_getres(CLOCK_MONOTONIC, NULL) >= 0)
986 return _POSIX_VERSION;
990 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
991 case _SC_THREAD_CPUTIME:
992 # if _POSIX_THREAD_CPUTIME > 0
993 return _POSIX_THREAD_CPUTIME;
1000 libc_hidden_def(sysconf)