11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions of source code must retain the above copyright 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions in binary form must reproduce the above copyright 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * the documentation and/or other materials provided with the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdlib.h> 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <unistd.h> 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stddef.h> 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <errno.h> 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/mman.h> 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/socket.h> 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/un.h> 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/select.h> 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/types.h> 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <netinet/in.h> 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ 431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/_system_properties.h> 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/atomics.h> 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic const char property_service_name[] = PROP_SERVICE_NAME; 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic unsigned dummy_props = 0; 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectprop_area *__system_property_area__ = (void*) &dummy_props; 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_properties_init(void) 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa; 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int s, fd; 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned sz; 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project char *env; 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(__system_property_area__ != ((void*) &dummy_props)) { 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project env = getenv("ANDROID_PROPERTY_WORKSPACE"); 651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (!env) { 661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fd = atoi(env); 691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project env = strchr(env, ','); 701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (!env) { 711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project sz = atoi(env + 1); 741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project pa = mmap(0, sz, PROT_READ, MAP_SHARED, fd, 0); 761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(pa == MAP_FAILED) { 781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if((pa->magic != PROP_AREA_MAGIC) || (pa->version != PROP_AREA_VERSION)) { 821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project munmap(pa, sz); 831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project __system_property_area__ = pa; 871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectconst prop_info *__system_property_find_nth(unsigned n) 911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa = __system_property_area__; 931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(n >= pa->count) { 951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return TOC_TO_INFO(pa, pa->toc[n]); 981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectconst prop_info *__system_property_find(const char *name) 1021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa = __system_property_area__; 1041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = pa->count; 1051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned *toc = pa->toc; 1061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned len = strlen(name); 1071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_info *pi; 1081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project while(count--) { 1101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned entry = *toc++; 1111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(TOC_NAME_LEN(entry) != len) continue; 1121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project pi = TOC_TO_INFO(pa, entry); 1141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(memcmp(name, pi->name, len)) continue; 1151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return pi; 1171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 1201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_property_read(const prop_info *pi, char *name, char *value) 1231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned serial, len; 1251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for(;;) { 1271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project serial = pi->serial; 1281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project while(SERIAL_DIRTY(serial)) { 12950ace4fec5e8cb5afcbc656a4556fa528adfd760David 'Digit' Turner __futex_wait((volatile void *)&pi->serial, serial, 0); 1301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project serial = pi->serial; 1311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project len = SERIAL_VALUE_LEN(serial); 1331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project memcpy(value, pi->value, len + 1); 1341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(serial == pi->serial) { 1351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(name != 0) { 1361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project strcpy(name, pi->name); 1371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return len; 1391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_property_get(const char *name, char *value) 1441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project const prop_info *pi = __system_property_find(name); 1461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(pi != 0) { 1481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return __system_property_read(pi, 0, value); 1491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project value[0] = 0; 1511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 1521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_property_wait(const prop_info *pi) 1561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 1581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(pi == 0) { 1591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa = __system_property_area__; 1601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project n = pa->serial; 1611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project do { 1621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project __futex_wait(&pa->serial, n, 0); 1631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } while(n == pa->serial); 1641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project n = pi->serial; 1661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project do { 16750ace4fec5e8cb5afcbc656a4556fa528adfd760David 'Digit' Turner __futex_wait((volatile void *)&pi->serial, n, 0); 1681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } while(n == pi->serial); 1691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 1711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 172