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platform_bionic/libc/bionic/sysconf.cpp
Elliott Hughes eb847bc866 Fix x86_64 build, clean up intermediate libraries. 
The x86_64 build was failing because clone.S had a call to __thread_entry which
was being added to a different intermediate .a on the way to making libc.so,
and the linker couldn't guarantee statically that such a relocation would be
possible.

  ld: error: out/target/product/generic_x86_64/obj/STATIC_LIBRARIES/libc_common_intermediates/libc_common.a(clone.o): requires dynamic R_X86_64_PC32 reloc against '__thread_entry' which may overflow at runtime; recompile with -fPIC

This patch addresses that by ensuring that the caller and callee end up in the
same intermediate .a. While I'm here, I've tried to clean up some of the mess
that led to this situation too. In particular, this removes libc/private/ from
the default include path (except for the DNS code), and splits out the DNS
code into its own library (since it's a weird special case of upstream NetBSD
code that's diverged so heavily it's unlikely ever to get back in sync).

There's more cleanup of the DNS situation possible, but this is definitely a
step in the right direction, and it's more than enough to get x86_64 building
cleanly.

Change-Id: I00425a7245b7a2573df16cc38798187d0729e7c4
2013-10-09 16:00:17 -07:00

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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pthread.h>
#include <stdio.h> // For FOPEN_MAX.
#include <string.h>
#include <sys/sysconf.h>
#include <time.h>
#include <unistd.h>
#include "private/bionic_tls.h"
#include "private/ScopedReaddir.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_SEM_VALUE_MAX 0x3fffffff /* see bionic/semaphore.c */
#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 bool __matches_cpuN(const char* s) {
// The %c trick is to ensure that we have the anchored match "^cpu[0-9]+$".
unsigned cpu;
char dummy;
return (sscanf(s, "cpu%u%c", &cpu, &dummy) == 1);
}
static int __sysconf_nprocessors_conf() {
// On x86 kernels you can use /proc/cpuinfo for this, but on ARM kernels offline CPUs disappear
// from there. This method works on both.
ScopedReaddir reader("/sys/devices/system/cpu");
if (reader.IsBad()) {
return 1;
}
int result = 0;
dirent* entry;
while ((entry = reader.ReadEntry()) != NULL) {
if (entry->d_type == DT_DIR && __matches_cpuN(entry->d_name)) {
++result;
}
}
return result;
}
static int __sysconf_nprocessors_onln() {
FILE* fp = fopen("/proc/stat", "r");
if (fp == NULL) {
return 1;
}
int result = 0;
char buf[256];
while (fgets(buf, sizeof(buf), fp) != NULL) {
// Extract just the first word from the line.
// 'cpu0 7976751 1364388 3116842 469770388 8629405 0 49047 0 0 0'
char* p = strchr(buf, ' ');
if (p != NULL) {
*p = 0;
}
if (__matches_cpuN(buf)) {
++result;
}
}
fclose(fp);
return result;
}
static int __get_meminfo(const char* pattern) {
FILE* fp = fopen("/proc/meminfo", "r");
if (fp == NULL) {
return -1;
}
int result = -1;
char buf[256];
while (fgets(buf, sizeof(buf), fp) != NULL) {
long total;
if (sscanf(buf, pattern, &total) == 1) {
result = (int) (total / (PAGE_SIZE/1024));
break;
}
}
fclose(fp);
return result;
}
static int __sysconf_phys_pages() {
return __get_meminfo("MemTotal: %ld kB");
}
static int __sysconf_avphys_pages() {
return __get_meminfo("MemFree: %ld kB");
}
static int __sysconf_monotonic_clock() {
timespec t;
int rc = clock_getres(CLOCK_MONOTONIC, &t);
return (rc == -1) ? -1 : _POSIX_VERSION;
}
int sysconf(int name) {
switch (name) {
#ifdef _POSIX_ARG_MAX
case _SC_ARG_MAX: return _POSIX_ARG_MAX;
#endif
#ifdef _POSIX2_BC_BASE_MAX
case _SC_BC_BASE_MAX: return _POSIX2_BC_BASE_MAX;
#endif
#ifdef _POSIX2_BC_DIM_MAX
case _SC_BC_DIM_MAX: return _POSIX2_BC_DIM_MAX;
#endif
#ifdef _POSIX2_BC_SCALE_MAX
case _SC_BC_SCALE_MAX: return _POSIX2_BC_SCALE_MAX;
#endif
#ifdef _POSIX2_BC_STRING_MAX
case _SC_BC_STRING_MAX: return _POSIX2_BC_STRING_MAX;
#endif
case _SC_CHILD_MAX: return CHILD_MAX;
case _SC_CLK_TCK: return SYSTEM_CLK_TCK;
#ifdef _POSIX2_COLL_WEIGHTS_MASK
case _SC_COLL_WEIGHTS_MAX: return _POSIX2_COLL_WEIGHTS_MASK;
#endif
#ifdef _POSIX2_EXPR_NEST_MAX
case _SC_EXPR_NEST_MAX: return _POSIX2_EXPR_NEST_MAX;
#endif
#ifdef _POSIX2_LINE_MAX
case _SC_LINE_MAX: return _POSIX2_LINE_MAX;
#endif
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;
#ifdef _POSIX_JOB_CONTROL
case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL;
#endif
#ifdef _POSIX_SAVED_IDS
case _SC_SAVED_IDS: return _POSIX_SAVED_IDS;
#endif
#ifdef _POSIX_VERSION
case _SC_VERSION: return _POSIX_VERSION;
#endif
//case _SC_RE_DUP_<AX: return ;
case _SC_STREAM_MAX: return FOPEN_MAX;
//case _SC_TZNAME_MAX: return ;
#if _XOPEN_CRYPT
case _SC_XOPEN_CRYPT: return _XOPEN_CRYPT;
#endif
#ifdef _XOPEN_ENH_I18N
case _SC_XOPEN_ENH_I18N: return _XOPEN_ENH_I18N;
#endif
#ifdef _XOPEN_SHM
case _SC_XOPEN_SHM: return _XOPEN_SHM;
#endif
#ifdef _XOPEN_VERSION
case _SC_XOPEN_VERSION: return _XOPEN_VERSION;
#endif
#ifdef _XOPEN_XCU_VERSION
case _SC_XOPEN_XCU_VERSION: return _XOPEN_XCU_VERSION;
#endif
#ifdef _XOPEN_REALTIME
case _SC_XOPEN_REALTIME: return _XOPEN_REALTIME;
#endif
#ifdef _XOPEN_REALTIME_THREADS
case _SC_XOPEN_REALTIME_THREADS: return _XOPEN_REALTIME_THREADS;
#endif
#ifdef _XOPEN_LEGACY
case _SC_XOPEN_LEGACY: return _XOPEN_LEGACY;
#endif
case _SC_ATEXIT_MAX: return SYSTEM_ATEXIT_MAX;
case _SC_IOV_MAX: return SYSTEM_IOV_MAX;
case _SC_PAGESIZE: return PAGE_SIZE;
case _SC_PAGE_SIZE: return PAGE_SIZE;
#ifdef _XOPEN_UNIX
case _SC_XOPEN_UNIX: return _XOPEN_UNIX;
#endif
// XXX: TODO: XBS5 nonsense
#ifdef AIO_LISTIO_MAX
case _SC_AIO_LISTIO_MAX: return AIO_LISTIO_MAX;
#endif
#ifdef AIO_MAX
case _SC_AIO_MAX: return AIO_MAX;
#endif
#ifdef AIO_PRIO_DELTA_MAX
case _SC_AIO_PRIO_DELTA_MAX: return AIO_PRIO_DELTA_MAX;
#endif
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_RTSIG_MAX: return RTSIG_MAX;
case _SC_SEM_NSEMS_MAX: return SYSTEM_SEM_NSEMS_MAX;
case _SC_SEM_VALUE_MAX: return SYSTEM_SEM_VALUE_MAX;
case _SC_SIGQUEUE_MAX: return SYSTEM_SIGQUEUE_MAX;
case _SC_TIMER_MAX: return SYSTEM_TIMER_MAX;
#ifdef _POSIX_ASYNCHRONOUS_IO
case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO;
#endif
#ifdef _POSIX_FSYNC
case _SC_FSYNC: return _POSIX_FSYNC;
#endif
#ifdef _POSIX_MAPPED_FILES
case _SC_MAPPED_FILES: return _POSIX_MAPPED_FILES;
#endif
#ifdef _POSIX_MEMLOCK
case _SC_MEMLOCK: return _POSIX_MEMLOCK;
#endif
#ifdef _POSIX_MEMLOCK_RANGE
case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE
#endif
#ifdef _POSIX_MEMORY_PROTECTION
case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION;
#endif
#ifdef _POSIX_MESSAGE_PASSING
case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING;
#endif
#ifdef _POSIX_PRIORITIZED_IO
case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO;
#endif
#ifdef _POSIX_PRIORITY_SCHEDULING
case _SC_PRIORITY_SCHEDULING: return _POSIX_PRIORITY_SCHEDULING;
#endif
#ifdef _POSIX_REALTIME_SIGNALS
case _SC_REALTIME_SIGNALS: return _POSIX_REALTIME_SIGNALS;
#endif
#ifdef _POSIX_SEMAPHORES
case _SC_SEMAPHORES: return _POSIX_SEMAPHORES;
#endif
#ifdef _POSIX_SHARED_MEMORY_OBJECTS
case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS;
#endif
#ifdef _POSIX_SYNCHRONIZED_IO
case _SC_SYNCHRONIZED_IO: return _POSIX_SYNCHRONIZED_IO;
#endif
#ifdef _POSIX_TIMERS
case _SC_TIMERS: return _POSIX_TIMERS;
#endif
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 - GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT);
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;
#ifdef _POSIX_THREADS
case _SC_THREADS: return _POSIX_THREADS;
#endif
#ifdef _POSIX_THREAD_ATTR_STACKADDR
case _SC_THREAD_ATTR_STACKADDR: return _POSIX_THREAD_ATTR_STACKADDR;
#endif
#ifdef _POSIX_THREAD_ATTR_STACKSIZE
case _SC_THREAD_ATTR_STACKSIZE: return _POSIX_THREAD_ATTR_STACKSIZE;
#endif
#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING;
#endif
#ifdef _POSIX_THREAD_PRIO_INHERIT
case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT;
#endif
#ifdef _POSIX_THREAD_PRIO_PROTECT
case _SC_THREAD_PRIO_PROTECT: return _POSIX_THREAD_PRIO_PROTECT;
#endif
#ifdef _POSIX_THREAD_SAFE_FUNCTIONS
case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS
#endif
case _SC_MONOTONIC_CLOCK: return __sysconf_monotonic_clock();
case _SC_NPROCESSORS_CONF: return __sysconf_nprocessors_conf();
case _SC_NPROCESSORS_ONLN: return __sysconf_nprocessors_onln();
case _SC_PHYS_PAGES: return __sysconf_phys_pages();
case _SC_AVPHYS_PAGES: return __sysconf_avphys_pages();
default:
/* Posix says EINVAL is the only error that shall be returned,
* but GLibc uses ENOSYS */
errno = ENOSYS;
return -1;
}
}
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