Initial Contribution
diff --git a/libc/unistd/sysconf.c b/libc/unistd/sysconf.c
new file mode 100644
index 0000000..a19edbb
--- /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 <sys/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;
+}