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> 3323bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick#include <poll.h> 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/mman.h> 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/socket.h> 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/un.h> 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/select.h> 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/types.h> 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <netinet/in.h> 42ec7e8cc9dddafc624cd28939c1a38ea336c89455satok#include <unistd.h> 431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/_system_properties.h> 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/atomics.h> 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 49ec7e8cc9dddafc624cd28939c1a38ea336c89455satokstatic const char property_service_socket[] = "/dev/socket/" PROP_SERVICE_NAME; 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic unsigned dummy_props = 0; 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectprop_area *__system_property_area__ = (void*) &dummy_props; 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_properties_init(void) 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa; 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int s, fd; 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned sz; 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project char *env; 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(__system_property_area__ != ((void*) &dummy_props)) { 631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project env = getenv("ANDROID_PROPERTY_WORKSPACE"); 671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (!env) { 681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fd = atoi(env); 711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project env = strchr(env, ','); 721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (!env) { 731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project sz = atoi(env + 1); 761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project pa = mmap(0, sz, PROT_READ, MAP_SHARED, fd, 0); 781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(pa == MAP_FAILED) { 801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if((pa->magic != PROP_AREA_MAGIC) || (pa->version != PROP_AREA_VERSION)) { 841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project munmap(pa, sz); 851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project __system_property_area__ = pa; 891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectconst prop_info *__system_property_find_nth(unsigned n) 931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa = __system_property_area__; 951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(n >= pa->count) { 971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return TOC_TO_INFO(pa, pa->toc[n]); 1001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectconst prop_info *__system_property_find(const char *name) 1041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa = __system_property_area__; 1061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = pa->count; 1071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned *toc = pa->toc; 1081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned len = strlen(name); 1091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_info *pi; 1101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project while(count--) { 1121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned entry = *toc++; 1131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(TOC_NAME_LEN(entry) != len) continue; 1141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project pi = TOC_TO_INFO(pa, entry); 1161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(memcmp(name, pi->name, len)) continue; 1171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return pi; 1191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 1221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_property_read(const prop_info *pi, char *name, char *value) 1251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned serial, len; 1271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for(;;) { 1291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project serial = pi->serial; 1301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project while(SERIAL_DIRTY(serial)) { 13150ace4fec5e8cb5afcbc656a4556fa528adfd760David 'Digit' Turner __futex_wait((volatile void *)&pi->serial, serial, 0); 1321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project serial = pi->serial; 1331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project len = SERIAL_VALUE_LEN(serial); 1351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project memcpy(value, pi->value, len + 1); 1361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(serial == pi->serial) { 1371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(name != 0) { 1381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project strcpy(name, pi->name); 1391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return len; 1411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_property_get(const char *name, char *value) 1461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project const prop_info *pi = __system_property_find(name); 1481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(pi != 0) { 1501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return __system_property_read(pi, 0, value); 1511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project value[0] = 0; 1531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 1541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 157ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 158ec7e8cc9dddafc624cd28939c1a38ea336c89455satokstatic int send_prop_msg(prop_msg *msg) 159ec7e8cc9dddafc624cd28939c1a38ea336c89455satok{ 16023bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick struct pollfd pollfds[1]; 161ec7e8cc9dddafc624cd28939c1a38ea336c89455satok struct sockaddr_un addr; 162ec7e8cc9dddafc624cd28939c1a38ea336c89455satok socklen_t alen; 163ec7e8cc9dddafc624cd28939c1a38ea336c89455satok size_t namelen; 164ec7e8cc9dddafc624cd28939c1a38ea336c89455satok int s; 165ec7e8cc9dddafc624cd28939c1a38ea336c89455satok int r; 16623bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick int result = -1; 167ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 168ec7e8cc9dddafc624cd28939c1a38ea336c89455satok s = socket(AF_LOCAL, SOCK_STREAM, 0); 169ec7e8cc9dddafc624cd28939c1a38ea336c89455satok if(s < 0) { 17023bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick return result; 171ec7e8cc9dddafc624cd28939c1a38ea336c89455satok } 172ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 173ec7e8cc9dddafc624cd28939c1a38ea336c89455satok memset(&addr, 0, sizeof(addr)); 174ec7e8cc9dddafc624cd28939c1a38ea336c89455satok namelen = strlen(property_service_socket); 175ec7e8cc9dddafc624cd28939c1a38ea336c89455satok strlcpy(addr.sun_path, property_service_socket, sizeof addr.sun_path); 176ec7e8cc9dddafc624cd28939c1a38ea336c89455satok addr.sun_family = AF_LOCAL; 177ec7e8cc9dddafc624cd28939c1a38ea336c89455satok alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1; 178ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 179c20d0f3993ebb0d3dec958a306a68ebb48bfeaddJens Gulin if(TEMP_FAILURE_RETRY(connect(s, (struct sockaddr *) &addr, alen)) < 0) { 180ec7e8cc9dddafc624cd28939c1a38ea336c89455satok close(s); 18123bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick return result; 182ec7e8cc9dddafc624cd28939c1a38ea336c89455satok } 183ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 184ec7e8cc9dddafc624cd28939c1a38ea336c89455satok r = TEMP_FAILURE_RETRY(send(s, msg, sizeof(prop_msg), 0)); 185ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 186ec7e8cc9dddafc624cd28939c1a38ea336c89455satok if(r == sizeof(prop_msg)) { 18723bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick // We successfully wrote to the property server but now we 18823bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick // wait for the property server to finish its work. It 18923bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick // acknowledges its completion by closing the socket so we 19023bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick // poll here (on nothing), waiting for the socket to close. 19123bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick // If you 'adb shell setprop foo bar' you'll see the POLLHUP 19223bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick // once the socket closes. Out of paranoia we cap our poll 19323bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick // at 250 ms. 19423bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick pollfds[0].fd = s; 19523bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick pollfds[0].events = 0; 19623bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick r = TEMP_FAILURE_RETRY(poll(pollfds, 1, 250 /* ms */)); 19723bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick if (r == 1 && (pollfds[0].revents & POLLHUP) != 0) { 19823bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick result = 0; 1998da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick } else { 2008da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // Ignore the timeout and treat it like a success anyway. 2018da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // The init process is single-threaded and its property 2028da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // service is sometimes slow to respond (perhaps it's off 2038da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // starting a child process or something) and thus this 2048da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // times out and the caller thinks it failed, even though 2058da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // it's still getting around to it. So we fake it here, 2068da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // mostly for ctl.* properties, but we do try and wait 250 2078da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // ms so callers who do read-after-write can reliably see 2088da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // what they've written. Most of the time. 2098da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick // TODO: fix the system properties design. 2108da75ab8936b0b7fcf8dd9a3befeb696ee6aa39dBrad Fitzpatrick result = 0; 21123bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick } 212ec7e8cc9dddafc624cd28939c1a38ea336c89455satok } 213ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 214ec7e8cc9dddafc624cd28939c1a38ea336c89455satok close(s); 21523bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick return result; 216ec7e8cc9dddafc624cd28939c1a38ea336c89455satok} 217ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 218ec7e8cc9dddafc624cd28939c1a38ea336c89455satokint __system_property_set(const char *key, const char *value) 219ec7e8cc9dddafc624cd28939c1a38ea336c89455satok{ 220ec7e8cc9dddafc624cd28939c1a38ea336c89455satok int err; 221ec7e8cc9dddafc624cd28939c1a38ea336c89455satok int tries = 0; 222ec7e8cc9dddafc624cd28939c1a38ea336c89455satok int update_seen = 0; 22323bc3ff71dffdfec208aee05938e544c7cb3bc37Brad Fitzpatrick prop_msg msg; 224ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 225ec7e8cc9dddafc624cd28939c1a38ea336c89455satok if(key == 0) return -1; 226ec7e8cc9dddafc624cd28939c1a38ea336c89455satok if(value == 0) value = ""; 227ec7e8cc9dddafc624cd28939c1a38ea336c89455satok if(strlen(key) >= PROP_NAME_MAX) return -1; 228ec7e8cc9dddafc624cd28939c1a38ea336c89455satok if(strlen(value) >= PROP_VALUE_MAX) return -1; 229ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 230ec7e8cc9dddafc624cd28939c1a38ea336c89455satok memset(&msg, 0, sizeof msg); 231ec7e8cc9dddafc624cd28939c1a38ea336c89455satok msg.cmd = PROP_MSG_SETPROP; 232ec7e8cc9dddafc624cd28939c1a38ea336c89455satok strlcpy(msg.name, key, sizeof msg.name); 233ec7e8cc9dddafc624cd28939c1a38ea336c89455satok strlcpy(msg.value, value, sizeof msg.value); 234ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 235ec7e8cc9dddafc624cd28939c1a38ea336c89455satok err = send_prop_msg(&msg); 236ec7e8cc9dddafc624cd28939c1a38ea336c89455satok if(err < 0) { 237ec7e8cc9dddafc624cd28939c1a38ea336c89455satok return err; 238ec7e8cc9dddafc624cd28939c1a38ea336c89455satok } 239ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 240ec7e8cc9dddafc624cd28939c1a38ea336c89455satok return 0; 241ec7e8cc9dddafc624cd28939c1a38ea336c89455satok} 242ec7e8cc9dddafc624cd28939c1a38ea336c89455satok 2431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint __system_property_wait(const prop_info *pi) 2441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 2451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 2461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(pi == 0) { 2471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prop_area *pa = __system_property_area__; 2481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project n = pa->serial; 2491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project do { 2501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project __futex_wait(&pa->serial, n, 0); 2511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } while(n == pa->serial); 2521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 2531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project n = pi->serial; 2541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project do { 25550ace4fec5e8cb5afcbc656a4556fa528adfd760David 'Digit' Turner __futex_wait((volatile void *)&pi->serial, n, 0); 2561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } while(n == pi->serial); 2571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 2591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 260