flesh out sysconf(3) and the _POSIX_* constants
Bug: 17571891
Change-Id: I81036615486bde65969ae5662587fcc88348474e
diff --git a/libc/bionic/sysconf.cpp b/libc/bionic/sysconf.cpp
index 2df6acc..67f48e7 100644
--- a/libc/bionic/sysconf.cpp
+++ b/libc/bionic/sysconf.cpp
@@ -29,8 +29,10 @@
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
+#include <linux/uio.h> // For UIO_MAXIOV.
#include <pthread.h>
#include <stdio.h> // For FOPEN_MAX.
+#include <sys/auxv.h>
#include <sys/sysconf.h>
#include <sys/sysinfo.h>
#include <time.h>
@@ -38,33 +40,6 @@
#include "private/bionic_tls.h"
-/* seems to be the default on Linux, per the GLibc sources and my own digging */
-
-#define SYSTEM_CLK_TCK 100
-#define SYSTEM_IOV_MAX 1024
-#define SYSTEM_DELAYTIMER_MAX 2147483647
-#define SYSTEM_MQ_OPEN_MAX 8
-#define SYSTEM_MQ_PRIO_MAX 32768
-#define SYSTEM_SEM_NSEMS_MAX 256
-#define SYSTEM_SIGQUEUE_MAX 32
-#define SYSTEM_TIMER_MAX 32
-#define SYSTEM_LOGIN_NAME_MAX 256
-#define SYSTEM_TTY_NAME_MAX 32
-
-/* the following depends on our implementation */
-#define SYSTEM_ATEXIT_MAX 65536 /* our implementation is unlimited */
-#define SYSTEM_THREAD_THREADS_MAX 2048 /* really unlimited */
-
-#define SYSTEM_2_C_BIND _POSIX_VERSION /* Posix C binding version */
-#define SYSTEM_2_C_VER _POSIX2_C_VERSION
-#define SYSTEM_2_C_DEV -1 /* Posix C development tools unsupported on the device */
-#define SYSTEM_2_FORT_DEV -1 /* Fortran development unsupported */
-#define SYSTEM_2_FORT_RUN -1 /* Fortran runtime unsupported */
-#define SYSTEM_2_SW_DEV -1 /* posix software dev utilities unsupported */
-#define SYSTEM_2_LOCALEDEF -1 /* localedef() unimplemented */
-#define SYSTEM_2_UPE -1 /* No UPE for you ! (User Portability Utilities) */
-#define SYSTEM_2_VERSION -1 /* No posix command-line tools */
-
static int __sysconf_monotonic_clock() {
timespec t;
int rc = clock_getres(CLOCK_MONOTONIC, &t);
@@ -73,103 +48,135 @@
long sysconf(int name) {
switch (name) {
- case _SC_ARG_MAX: return _POSIX_ARG_MAX;
+ case _SC_ARG_MAX: return ARG_MAX;
+ case _SC_BC_BASE_MAX: return _POSIX2_BC_BASE_MAX; // Minimum requirement.
+ case _SC_BC_DIM_MAX: return _POSIX2_BC_DIM_MAX; // Minimum requirement.
+ case _SC_BC_SCALE_MAX: return _POSIX2_BC_SCALE_MAX; // Minimum requirement.
+ case _SC_BC_STRING_MAX: return _POSIX2_BC_STRING_MAX; // Minimum requirement.
case _SC_CHILD_MAX: return CHILD_MAX;
- case _SC_CLK_TCK: return SYSTEM_CLK_TCK;
- case _SC_LINE_MAX: return _POSIX2_LINE_MAX;
+ case _SC_CLK_TCK: return static_cast<long>(getauxval(AT_CLKTCK));
+ case _SC_COLL_WEIGHTS_MAX: return _POSIX2_COLL_WEIGHTS_MAX; // Minimum requirement.
+ case _SC_EXPR_NEST_MAX: return _POSIX2_EXPR_NEST_MAX; // Minimum requirement.
+ case _SC_LINE_MAX: return _POSIX2_LINE_MAX; // Minimum requirement.
case _SC_NGROUPS_MAX: return NGROUPS_MAX;
case _SC_OPEN_MAX: return OPEN_MAX;
case _SC_PASS_MAX: return PASS_MAX;
- case _SC_2_C_BIND: return SYSTEM_2_C_BIND;
- case _SC_2_C_DEV: return SYSTEM_2_C_DEV;
- case _SC_2_C_VERSION: return SYSTEM_2_C_VER;
- //case _SC_2_CHAR_TERM: return ;
- case _SC_2_FORT_DEV: return SYSTEM_2_FORT_DEV;
- case _SC_2_FORT_RUN: return SYSTEM_2_FORT_RUN;
- case _SC_2_LOCALEDEF: return SYSTEM_2_LOCALEDEF;
- case _SC_2_SW_DEV: return SYSTEM_2_SW_DEV;
- case _SC_2_UPE: return SYSTEM_2_UPE;
- case _SC_2_VERSION: return SYSTEM_2_VERSION;
+ case _SC_2_C_BIND: return _POSIX2_C_BIND;
+ case _SC_2_C_DEV: return _POSIX2_C_DEV;
+ case _SC_2_CHAR_TERM: return _POSIX2_CHAR_TERM;
+ case _SC_2_FORT_DEV: return -1;
+ case _SC_2_FORT_RUN: return -1;
+ case _SC_2_LOCALEDEF: return _POSIX2_LOCALEDEF;
+ case _SC_2_SW_DEV: return _POSIX2_SW_DEV;
+ case _SC_2_UPE: return _POSIX2_UPE;
+ case _SC_2_VERSION: return _POSIX2_VERSION;
case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL;
case _SC_SAVED_IDS: return _POSIX_SAVED_IDS;
case _SC_VERSION: return _POSIX_VERSION;
- case _SC_RE_DUP_MAX: return _POSIX_RE_DUP_MAX;
+ case _SC_RE_DUP_MAX: return _POSIX_RE_DUP_MAX; // Minimum requirement.
case _SC_STREAM_MAX: return FOPEN_MAX;
- case _SC_TZNAME_MAX: return _POSIX_TZNAME_MAX;
+ case _SC_TZNAME_MAX: return _POSIX_TZNAME_MAX; // Minimum requirement.
case _SC_XOPEN_CRYPT: return _XOPEN_CRYPT;
case _SC_XOPEN_ENH_I18N: return _XOPEN_ENH_I18N;
- //case _SC_XOPEN_SHM: return _XOPEN_SHM;
+ case _SC_XOPEN_SHM: return _XOPEN_SHM;
case _SC_XOPEN_VERSION: return _XOPEN_VERSION;
- case _SC_XOPEN_XCU_VERSION: return _XOPEN_XCU_VERSION;
case _SC_XOPEN_REALTIME: return _XOPEN_REALTIME;
case _SC_XOPEN_REALTIME_THREADS: return _XOPEN_REALTIME_THREADS;
case _SC_XOPEN_LEGACY: return _XOPEN_LEGACY;
- case _SC_ATEXIT_MAX: return SYSTEM_ATEXIT_MAX;
- case _SC_IOV_MAX: return SYSTEM_IOV_MAX;
+ case _SC_ATEXIT_MAX: return LONG_MAX; // Unlimited.
+ case _SC_IOV_MAX: return UIO_MAXIOV;
- case _SC_PAGESIZE:
- case _SC_PAGE_SIZE:
- return PAGE_SIZE;
-
+ case _SC_PAGESIZE: // Fall through, PAGESIZE and PAGE_SIZE always hold the same value.
+ case _SC_PAGE_SIZE: return PAGE_SIZE;
case _SC_XOPEN_UNIX: return _XOPEN_UNIX;
-
- // XXX: TODO: XBS5 nonsense
-
- //case _SC_AIO_LISTIO_MAX: return AIO_LISTIO_MAX;
- //case _SC_AIO_MAX: return AIO_MAX;
- //case _SC_AIO_PRIO_DELTA_MAX: return AIO_PRIO_DELTA_MAX;
- case _SC_DELAYTIMER_MAX: return SYSTEM_DELAYTIMER_MAX;
- case _SC_MQ_OPEN_MAX: return SYSTEM_MQ_OPEN_MAX;
- case _SC_MQ_PRIO_MAX: return SYSTEM_MQ_PRIO_MAX;
+ case _SC_AIO_LISTIO_MAX: return _POSIX_AIO_LISTIO_MAX; // Minimum requirement.
+ case _SC_AIO_MAX: return _POSIX_AIO_MAX; // Minimum requirement.
+ case _SC_AIO_PRIO_DELTA_MAX:return 0; // Minimum requirement.
+ case _SC_DELAYTIMER_MAX: return INT_MAX;
+ case _SC_MQ_OPEN_MAX: return _POSIX_MQ_OPEN_MAX; // Minimum requirement.
+ case _SC_MQ_PRIO_MAX: return _POSIX_MQ_PRIO_MAX; // Minimum requirement.
case _SC_RTSIG_MAX: return RTSIG_MAX;
- case _SC_SEM_NSEMS_MAX: return SYSTEM_SEM_NSEMS_MAX;
+ case _SC_SEM_NSEMS_MAX: return _POSIX_SEM_NSEMS_MAX; // Minimum requirement.
case _SC_SEM_VALUE_MAX: return SEM_VALUE_MAX;
- case _SC_SIGQUEUE_MAX: return SYSTEM_SIGQUEUE_MAX;
- case _SC_TIMER_MAX: return SYSTEM_TIMER_MAX;
- //case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO;
+ case _SC_SIGQUEUE_MAX: return _POSIX_SIGQUEUE_MAX; // Minimum requirement.
+ case _SC_TIMER_MAX: return _POSIX_TIMER_MAX; // Minimum requirement.
+ case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO;
case _SC_FSYNC: return _POSIX_FSYNC;
case _SC_MAPPED_FILES: return _POSIX_MAPPED_FILES;
- //case _SC_MEMLOCK: return _POSIX_MEMLOCK;
- //case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE;
- //case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION;
- //case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING;
- //case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO;
+ case _SC_MEMLOCK: return _POSIX_MEMLOCK;
+ case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE;
+ case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION;
+ case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING;
+ case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO;
case _SC_PRIORITY_SCHEDULING: return _POSIX_PRIORITY_SCHEDULING;
case _SC_REALTIME_SIGNALS: return _POSIX_REALTIME_SIGNALS;
case _SC_SEMAPHORES: return _POSIX_SEMAPHORES;
- //case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS;
+ case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS;
case _SC_SYNCHRONIZED_IO: return _POSIX_SYNCHRONIZED_IO;
case _SC_TIMERS: return _POSIX_TIMERS;
-
- case _SC_GETGR_R_SIZE_MAX: return 1024;
- case _SC_GETPW_R_SIZE_MAX: return 1024;
-
- case _SC_LOGIN_NAME_MAX: return SYSTEM_LOGIN_NAME_MAX;
-
- case _SC_THREAD_DESTRUCTOR_ITERATIONS:
- return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
-
- case _SC_THREAD_KEYS_MAX:
- return (BIONIC_TLS_SLOTS - TLS_SLOT_FIRST_USER_SLOT - BIONIC_TLS_RESERVED_SLOTS);
-
+ case _SC_GETGR_R_SIZE_MAX: return 1024;
+ case _SC_GETPW_R_SIZE_MAX: return 1024;
+ case _SC_LOGIN_NAME_MAX: return 256; // Seems default on linux.
+ case _SC_THREAD_DESTRUCTOR_ITERATIONS: return PTHREAD_DESTRUCTOR_ITERATIONS;
+ case _SC_THREAD_KEYS_MAX: return PTHREAD_KEYS_MAX;
case _SC_THREAD_STACK_MIN: return PTHREAD_STACK_MIN;
- case _SC_THREAD_THREADS_MAX: return SYSTEM_THREAD_THREADS_MAX;
- case _SC_TTY_NAME_MAX: return SYSTEM_TTY_NAME_MAX;
+ case _SC_THREAD_THREADS_MAX: return PTHREAD_THREADS_MAX;
+ case _SC_TTY_NAME_MAX: return 32; // Seems default on linux.
case _SC_THREADS: return _POSIX_THREADS;
-
- case _SC_THREAD_ATTR_STACKADDR: return -1; // Removed in POSIX 2008
- case _SC_THREAD_ATTR_STACKSIZE: return -1; // Removed in POSIX 2008
-
- //case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING;
- case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT;
+ case _SC_THREAD_ATTR_STACKADDR: return _POSIX_THREAD_ATTR_STACKADDR;
+ case _SC_THREAD_ATTR_STACKSIZE: return _POSIX_THREAD_ATTR_STACKSIZE;
+ case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING;
+ case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT;
case _SC_THREAD_PRIO_PROTECT: return _POSIX_THREAD_PRIO_PROTECT;
- //case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS
-
- case _SC_MONOTONIC_CLOCK: return __sysconf_monotonic_clock();
+ case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS;
case _SC_NPROCESSORS_CONF: return get_nprocs_conf();
case _SC_NPROCESSORS_ONLN: return get_nprocs();
case _SC_PHYS_PAGES: return get_phys_pages();
case _SC_AVPHYS_PAGES: return get_avphys_pages();
+ case _SC_MONOTONIC_CLOCK: return __sysconf_monotonic_clock();
+
+ case _SC_2_PBS: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_2_PBS_ACCOUNTING: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_2_PBS_CHECKPOINT: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_2_PBS_LOCATE: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_2_PBS_MESSAGE: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_2_PBS_TRACK: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_ADVISORY_INFO: return _POSIX_ADVISORY_INFO;
+ case _SC_BARRIERS: return _POSIX_BARRIERS;
+ case _SC_CLOCK_SELECTION: return _POSIX_CLOCK_SELECTION;
+ case _SC_CPUTIME: return _POSIX_CPUTIME;
+ case _SC_HOST_NAME_MAX: return _POSIX_HOST_NAME_MAX; // Minimum requirement.
+ case _SC_IPV6: return _POSIX_IPV6;
+ case _SC_RAW_SOCKETS: return _POSIX_RAW_SOCKETS;
+ case _SC_READER_WRITER_LOCKS: return _POSIX_READER_WRITER_LOCKS;
+ case _SC_REGEXP: return _POSIX_REGEXP;
+ case _SC_SHELL: return _POSIX_SHELL;
+ case _SC_SPAWN: return _POSIX_SPAWN;
+ case _SC_SPIN_LOCKS: return _POSIX_SPIN_LOCKS;
+ case _SC_SPORADIC_SERVER: return _POSIX_SPORADIC_SERVER;
+ case _SC_SS_REPL_MAX: return -1;
+ case _SC_SYMLOOP_MAX: return _POSIX_SYMLOOP_MAX; // Minimum requirement.
+ case _SC_THREAD_CPUTIME: return _POSIX_THREAD_CPUTIME;
+ case _SC_THREAD_PROCESS_SHARED: return _POSIX_THREAD_PROCESS_SHARED;
+ case _SC_THREAD_ROBUST_PRIO_INHERIT: return _POSIX_THREAD_ROBUST_PRIO_INHERIT;
+ case _SC_THREAD_ROBUST_PRIO_PROTECT: return _POSIX_THREAD_ROBUST_PRIO_PROTECT;
+ case _SC_THREAD_SPORADIC_SERVER: return _POSIX_THREAD_SPORADIC_SERVER;
+ case _SC_TIMEOUTS: return _POSIX_TIMEOUTS;
+ case _SC_TRACE: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_TRACE_EVENT_FILTER: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_TRACE_EVENT_NAME_MAX: return -1;
+ case _SC_TRACE_INHERIT: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_TRACE_LOG: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_TRACE_NAME_MAX: return -1;
+ case _SC_TRACE_SYS_MAX: return -1;
+ case _SC_TRACE_USER_EVENT_MAX: return -1;
+ case _SC_TYPED_MEMORY_OBJECTS: return _POSIX_TYPED_MEMORY_OBJECTS;
+ case _SC_V7_ILP32_OFF32: return _POSIX_V7_ILP32_OFF32;
+ case _SC_V7_ILP32_OFFBIG: return _POSIX_V7_ILP32_OFFBIG;
+ case _SC_V7_LP64_OFF64: return _POSIX_V7_LP64_OFF64;
+ case _SC_V7_LPBIG_OFFBIG: return _POSIX_V7_LPBIG_OFFBIG;
+ case _SC_XOPEN_STREAMS: return -1; // Obsolescent in POSIX.1-2008.
+ case _SC_XOPEN_UUCP: return -1;
default:
// Posix says EINVAL is the only error that shall be returned,