1 <html><body><pre>Bionic ChangeLog: 2 ----------------- 3 4 ------------------------------------------------------------------------------- 5 Differences between Android 2.3 and Android 2.2: 6 7 - <pthread.h>: Add reader/writer locks implementation. Add sanity 8 checking to pthread_mutex_destroy() (e.g. a locked mutex will return 9 EBUSY). 10 11 - <semaphore.h>: Use private futexes for semaphore implementation, 12 unless your set 'pshared' to non-0 when calling sem_init(). 13 14 Also fixed a bug in sem_post() to make it wake up all waiting 15 threads, instead of one. As a consequence, the maximum semaphore 16 value is now reduced to 0x3fffffff. 17 18 - <math.h>: Added sincos(), sincosf() and sincosl() (GLibc compatibility). 19 20 - <sys/sysinfo.h>: Added missing sysinfo() system call implementation 21 (the function was already declared in the header though). 22 23 - sysconf() didn't work for some arguments due to a small bug in the 24 /proc line parser. 25 26 - <termio.h>: added missing header (just includes <termios.h>) 27 28 - <unistd.h>: add missing declaration for truncate(). The implementation 29 was already here since Android 1.5. 30 31 modify implementation of alarm() to return 0 in case of error (i.e. 32 if a value larger than 0x7fffffff seconds is passed to it). This 33 makes the implementation compliant with the GLibc behaviour. 34 35 - <wchar.h>: small fixes to really support wchar_t in Bionic (not there yet). 36 37 the size of wchar_t is still 32-bit (decided by the compiler) 38 39 WCHAR_MIN: changed from 0 to INT_MIN 40 WCHAR_MAX: changed from 255 to INT_MAX 41 42 wcpcpy(), wcpncpy(), wcscat(), wcschr(), wcscmp(), 43 wcscpy(), wcscspn(), wcsdup(), wcslcat(), wcslcpy(), 44 wcslen(), wcsncat(), wcsncmp(), wcsncpy(), wcsnlen(), 45 wcspbrk(), wcsrchr(), wcsrchr(), wcsspn(), wcsstr(), 46 wcstok(), wcswidth(), wmemchr(), wmemcmp(), wmemcpy(), 47 wmemmove(), wmemset(): Added proper implementations. 48 49 wcscasecmp(), wcsncasecmp(): Added implementation limited 50 to ASCII codes for lower/upper. 51 52 wcscoll(): added dummy implementation that calls wcscmp() 53 wcsxfrm(): added dummy implementation that calls wcsncpy() 54 55 NOTE: Technically, this breaks the ABI, but we never claimed to support 56 wchar_t anyway. The wchar_t support is still *NOT* official at this 57 point. We need better multi-byte support code, and wprintf/wscanf 58 stuff too. 59 60 - <inttypes.h>: add missing declarations for strntoimax abd strntoumax. 61 62 - <stdlib.h>: add missing declarations for drand48() and erand48(). 63 64 - clearerr(): fix broken implementation. 65 66 - Feature test macros like _POSIX_C_SOURCE / _XOPEN_SOURCE / _C99_SOURCE 67 are now handled correctly by our C library headers (see <sys/cdefs.h>) 68 69 - <sys/select.h>: add missing declaration for pselect() 70 71 - <sys/vfs.h>: fixed implementation of fstatfs() (also fixes fpathconf() 72 which uses it). 73 74 - Added an implementation of pthread_atfork() 75 76 - <dlfcn.h>: fixed dlopen() implementation to support dlopen(NULL, ...). 77 This allows one to look at the dynamic symbols exported by an executable. 78 79 - <private/bionic_tls.h>: use kernel helper functions for static versions 80 of the C library. This is necessary because we don't know where the corresponding 81 machine code is going to run, and the optimization for __get_tls() might 82 not match the features of the target device where we run a static executable 83 linked to the C library. This fixes one of the bug that explains why gdbserver 84 didn't work well with threads. 85 86 ------------------------------------------------------------------------------- 87 Differences between Android 2.2. and Android 2.1: 88 89 - Support FP register save/load in setjmp()/longjmp() on ARMv7 builds. 90 91 - Add support for SH-4 CPU architecture ! 92 93 - __atomic_swap(): use LDREX/STREX CPU instructions on ARMv6 and higher. 94 95 - <arpa/telnet.h>: New header (declarations only, no implementation). 96 97 - <err.h>: New header + implementation. GLibc compatibility. 98 99 - <warn.h>: New header + implementation. GLibc compatibility. 100 101 - <fts.h>: New header + implementation. 102 103 - <mntent.h>: Add missing <stdio.h> include. 104 105 - <regex.h>: New header + implementation. 106 107 - <signal.h>: Added killpg() 108 109 - <stdint.h>: Allow 64-bit type declarations on C99 builds. 110 111 - <stdio.h>: Add fdprintf() and vfdprintf(). Note that GLibc provides 112 the confusing 'dprintf' and 'vdprintf()' functions instead. 113 114 - <stdlib.h>: Fix ptsname_r(): the return type is int instead of char*. 115 The mistake comes from a GLibc man page bug (the man page listed a return 116 type of char*, while the implementation used int. Fixed in late 2009 only). 117 The Bionic implementation was incorrect. Technically, this is an ABI 118 breakage, but code that used this function probably never worked or 119 compiled properly anyway. 120 121 - <strings.h>: Add missing <sys/types.h> include. 122 123 - <sys/queue.h>: Added new header (no implementation - macro templates). 124 125 - <sys/resource.h>: Add rlim_t proper definition. 126 127 - <time64.h>: Add missing C++ header inclusion guards. 128 129 - <unistd.h>: Add getusershell(), setusershell() and endusershell(), though 130 implementation are bogus. GLibc compatibility. 131 132 - <wchar.h>: Add mbstowcs() and wcstombs() 133 134 - add clone() implementation for ARM (x86 and SH-4 not working yet). 135 136 - <sys/epoll.h>: <sys/system_properties.h>: Add missing C++ inclusion guards 137 138 - fix getpwnam() and getpwgrp() to accept "app_0" as a valid user name. 139 140 - fix sem_trywait() to return -1 and set errno to EAGAIN, instead of 141 returning EAGAIN directly. 142 143 - fix sem_post() to wake up multiple threads when called rapidly in 144 succession. 145 146 - DNS: partial implementation of RFC3484 (rule 1, 2, 5, 6, 8, 10 and 147 modified rule 9), for better address selection/sorting. 148 In the process, removed code that was previously used for "sortlist" 149 in /etc/resolv.conf. (resolv.conf is already ignored, so the latter 150 is a no-op for actual functionality.) 151 152 - fix pthread_sigmask() to properly return an error code without touching 153 errno. Previous implementation returned -1 on error, setting errno, which 154 is not Posix compliant. 155 156 - add sigaltstack() implementation for ARM. 157 158 - <time.h>: Properly implement the 'timezone' and 'daylight' global variables 159 (they were not defined previously, though declared in the header). 160 161 - <time.h>: Fix timezone management implementation to properly update 162 'tm_gmtoff' field in 'struct tm' structure. 163 164 - DNS: get rid of spurious random DNS queries when trying to resolve 165 an unknown domain name. Due to an initialization bug, a random DNS search 166 list was generated for each thread if net.dns.search is not defined. 167 168 - <pthread.h>: Add pthread_condattr_init/destroy/setpshared/getpshared functions 169 to enable proper shared conditional variable initialization. 170 171 Modify the pthread_mutex_t and pthread_cond_t implementation to use private 172 futexes for performance reasons. Mutexes and Condvars are no longer shareable 173 between processes by default anymore, unless you use PTHREAD_PROCESS_SHARED 174 with pthread_mutexattr_setpshared() and/or pthread_condattr_setpshared(). 175 176 ------------------------------------------------------------------------------- 177 Differences between Android 2.1 and 2.0.1: 178 179 - zoneinfo: updated data tables to version 2009s 180 181 182 ------------------------------------------------------------------------------- 183 Differences between Android 2.0.1 and 2.0: 184 185 - abort(): ARM-specific hack to preserve the 'lr' register when abort() 186 is called (GCC does not preserve it by default since it thinks that 187 abort() never returns). This improves stack traces considerably. 188 189 190 ------------------------------------------------------------------------------- 191 Differences between Android 2.0 and 1.6: 192 193 - memcmp(), memcpy(): ARMv7 optimized versions. 194 195 - pthread_mutexattr_setpshared(): implementation will not return ENOTSUP 196 if PTHREAD_PROCESS_SHARED is used, because our Mutex implementation can 197 work across multiple processes. 198 199 *HOWEVER* it does not use "robust futexes" which means that held mutexes 200 *are not* automatically released by the kernel when the owner process 201 crashes or exits. This is only done to simplify communication between 202 two always-live system processes, DO NOT USE THIS IN APPLICATIONS ! 203 204 - pthread_mutex_lock_timeout_np(): New Android-specific function to 205 perform a timed lock (). In case of timeout, it returns EBUSY. 206 207 - pthread_cond_timedwait_monotonic_np(): Same as pthread_cond_timedwait() 208 but uses the monotonic clock(). Android-specific. 209 210 - pthread_cond_timedwait_relative_np(): Same as pthread_cond_timedwait() 211 but uses a relative timeout instead. Android-specific. 212 213 - <netinet/in.h>: Now includes <netinet/in6.h>. 214 215 - <netinet/in6.h>: Added IPV6_JOIN_GROUP, IPV6_LEAVE_GROUP, IN6ADDR_ANY_INIT 216 and ipv6mr_interface definitions. 217 218 - <time.h>: 219 * Add missing tzset() declaration. 220 * Add Android-specific strftime_tz(). 221 222 - getaddrinfo(): 223 Only perform IPv6 lookup for AF_UNSPEC if we have IPv6 connectivity. 224 This saves one DNS query per lookup on non-IPv6 systems. 225 226 - mktime(): Fix an infinite loop problem that appeared when switching to 227 GCC 4.4.0. 228 229 - strftime(): fix incorrect handling of dates > 2038 due to 64-bit issue 230 in original code. 231 232 ------------------------------------------------------------------------------- 233 Differences between Android 1.6 and 1.5: 234 235 - C runtime: Fix runtime initialization to be called before any static C++ 236 constructors. This allows these to use pthread functions properly. 237 238 - __aeabi_atexit(): Fix implementation to properly call C++ static destructors 239 when the program exits (or when a shared library is unloaded). 240 241 - <sys/stat.h>: added GLibc compatibility macros definitions: 242 243 #define st_atimensec st_atime_nsec 244 #define st_mtimensec st_mtime_nsec 245 #define st_ctimensec st_ctime_nsec 246 247 - getaddrinfo(): implementation will now allow numeric ports if ai_socktype is 248 set to ANY. This is to match the GLibc behaviour. 249 250 - getservent(): and getservent_r() incorrectly returned the port in host-endian 251 order in the s_port field. It now returns it in big-endian order. 252 253 - DNS: Allow underscore in the middle of DNS labels. While not really 254 standard, this extension is needed for some VPN configurations and is 255 supported by other operating systems. 256 257 - DNS: Support for DNS domain search lists through the new net.dns.search 258 system property. The corresponding value must be a space-separated list of 259 domain suffixes. 260 </pre></body></html>