diff options
Diffstat (limited to 'libc/unistd/sysconf.c')
| -rw-r--r-- | libc/unistd/sysconf.c | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/libc/unistd/sysconf.c b/libc/unistd/sysconf.c new file mode 100644 index 0000000..d3089a4 --- /dev/null +++ b/libc/unistd/sysconf.c @@ -0,0 +1,434 @@ +/* + * 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 <unistd.h> +#include <sys/sysconf.h> +#include <limits.h> +#include <bionic_tls.h> +#include <asm/page.h> +#include <stdio.h> /* for FOPEN_MAX */ +#include <errno.h> +#include <fcntl.h> +#include <string.h> +#include <ctype.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 (2147483647) +#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_KEYS_MAX BIONIC_TLS_SLOTS +#define SYSTEM_THREAD_STACK_MIN 32768 /* lower values may be possible, but be conservative */ +#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 /* localdef() 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 __get_nproc_conf(void); +static int __get_nproc_onln(void); +static int __get_phys_pages(void); +static int __get_avphys_pages(void); + +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_NEXT_MASK: 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 + + // GETGR_R_SIZE_MAX ? + // GETPW_R_SIZE_MAX ? + + case _SC_LOGIN_NAME_MAX: return SYSTEM_LOGIN_NAME_MAX; +#ifdef _POSIX_THREAD_DESTRUCTOR_ITERATIONS + case _SC_THREAD_DESTRUCTOR_ITERATIONS: return _POSIX_THREAD_DESTRUCTOR_ITERATIONS; +#endif + case _SC_THREAD_KEYS_MAX: return SYSTEM_THREAD_KEYS_MAX; + case _SC_THREAD_STACK_MIN: return SYSTEM_THREAD_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_NPROCESSORS_CONF: return __get_nproc_conf(); + case _SC_NPROCESSORS_ONLN: return __get_nproc_onln(); + case _SC_PHYS_PAGES: return __get_phys_pages(); + case _SC_AVPHYS_PAGES: return __get_avphys_pages(); + + default: + /* Posix says EINVAL is the only error that shall be returned, + * but GLibc uses ENOSYS */ + errno = ENOSYS; + return -1; + } +} + + +typedef struct { + int rpos; + int len; + int overflow; + int fd; + int in_len; + int in_pos; + char buff[128]; + char input[128]; +} LineParser; + +static int +line_parser_init( LineParser* p, const char* path ) +{ + p->rpos = 0; + p->len = (int)sizeof(p->buff); + p->overflow = 0; + + p->in_len = 0; + p->in_pos = 0; + p->fd = open( path, O_RDONLY ); + + return p->fd; +} + + +static int +line_parser_addc( LineParser* p, int c ) +{ + if (p->overflow) { + p->overflow = (c == '\n'); + return 0; + } + if (p->rpos >= p->len) { + p->overflow = 1; + return 0; + } + if (c == '\n') { + p->buff[p->rpos] = 0; + p->rpos = 0; + return 1; + } + p->buff[p->rpos++] = (char) c; + return 0; +} + +static int +line_parser_getc( LineParser* p ) +{ + if (p->in_len >= p->in_pos) { + int ret; + + p->in_len = p->in_pos = 0; + do { + ret = read(p->fd, p->input, sizeof(p->input)); + } while (ret < 0 && errno == EINTR); + + if (ret <= 0) + return -1; + + p->in_len = ret; + } + return p->input[ p->in_pos++ ]; +} + +static const char* +line_parser_gets( LineParser* p ) +{ + for (;;) { + for (;;) { + int c = line_parser_getc(p); + + if (c < 0) { + close(p->fd); + p->fd = -1; + return NULL; + } + if (line_parser_addc(p, c)) + return p->buff; + } + } +} + +static void +line_parser_done( LineParser* p ) +{ + if (p->fd >= 0) { + close(p->fd); + p->fd = -1; + } +} + +static int +__get_nproc_conf(void) +{ + LineParser parser[1]; + const char* p; + int count = 0; + + if (line_parser_init(parser, "/proc/cpuinfo") < 0) + return 1; + + while ((p = line_parser_gets(parser))) { + if ( !memcmp(p, "processor", 9) ) + count += 1; + } + return (count < 1) ? 1 : count; +} + + +static int +__get_nproc_onln(void) +{ + LineParser parser[1]; + const char* p; + int count = 0; + + if (line_parser_init(parser, "/proc/stat") < 0) + return 1; + + while ((p = line_parser_gets(parser))) { + if ( !memcmp(p, "cpu", 3) && isdigit(p[3]) ) + count += 1; + } + return (count < 1) ? 1 : count; +} + +static int +__get_phys_pages(void) +{ + LineParser parser[1]; + const char* p; + + if (line_parser_init(parser, "/proc/meminfo") < 0) + return -2; /* what ? */ + + while ((p = line_parser_gets(parser))) { + long total; + if ( sscanf(p, "MemTotal: %ld kB", &total) == 1 ) { + line_parser_done(parser); + return (int) (total / (PAGE_SIZE/1024)); + } + } + return -3; +} + +static int +__get_avphys_pages(void) +{ + LineParser parser[1]; + const char* p; + + if (line_parser_init(parser, "/proc/meminfo") < 0) + return -1; /* what ? */ + + while ((p = line_parser_gets(parser))) { + long total; + if ( sscanf(p, "MemFree: %ld kB", &total) == 1 ) { + line_parser_done(parser); + return (int) (total / (PAGE_SIZE/1024)); + } + } + return -1; +} |