bionic/libc
2010-12-06 13:18:37 -08:00
..
arch-arm bionic: Add ARM optimized strcpy() 2010-11-22 13:01:32 -08:00
arch-sh Allow dlclose() to properly call static C++ destructors. 2010-07-01 23:09:28 -07:00
arch-x86 Update ATOM string routines to latest 2010-10-11 12:33:58 -07:00
bionic Remove duplicated _rand48 implementation. Use stdlib version instead 2010-10-25 16:27:47 -07:00
docs Implemented pthread_atfork() 2010-07-23 13:10:16 -07:00
include Merge "Hide the symbol of helper function __libc_android_abort" 2010-10-11 07:13:10 -07:00
inet added missing ether_aton and ether_ntoa 2010-06-11 20:48:40 -04:00
kernel Add defines for CAIF support 2010-12-03 16:14:59 -08:00
netbsd resolv: make internal symbols static/hidden 2010-10-15 02:10:29 +08:00
private Allow dlclose() to properly call static C++ destructors. 2010-07-01 23:09:28 -07:00
regex Import regex from OpenBSD 2010-01-15 15:01:44 -08:00
stdio stdio: make internal symbols static/hidden 2010-10-15 01:10:31 +08:00
stdlib stdlib: strtod: Hide internal symbol __dtoa 2010-10-15 01:39:27 +08:00
string Merge "string: tidy up strndup()" 2010-05-10 14:52:02 -07:00
tools modified SYSCALLS.TXT to support SuperH architecture 2009-09-01 19:03:06 +09:00
tzcode eclair snapshot 2009-11-12 18:45:14 -08:00
unistd sigsetmask.c was not processing the "mask" argument. 2010-12-03 16:48:47 -08:00
zoneinfo Rebuild the time zone data files in 32-bit format instead of 64-bit. 2009-11-24 13:52:05 -08:00
Android.mk bionic: Add ARM optimized strcpy() 2010-11-22 13:01:32 -08:00
CAVEATS auto import from //depot/cupcake/@135843 2009-03-03 19:28:35 -08:00
Jamfile auto import from //depot/cupcake/@135843 2009-03-03 19:28:35 -08:00
MODULE_LICENSE_BSD auto import from //depot/cupcake/@135843 2009-03-03 19:28:35 -08:00
NOTICE auto import from //depot/cupcake/@135843 2009-03-03 19:28:35 -08:00
README Add an 's and a . to the bionic/libc README. 2009-07-23 17:41:47 -07:00
SYSCALLS.TXT Add eventfd system call support 2010-08-31 16:16:01 -05:00

Welcome to Bionic, Android's small and custom C library for the Android
platform.

Bionic is mainly a port of the BSD C library to our Linux kernel with the
following additions/changes:

- no support for locales
- no support for wide chars (i.e. multi-byte characters)
- its own smallish implementation of pthreads based on Linux futexes
- support for x86, ARM and ARM thumb CPU instruction sets and kernel interfaces

Bionic is released under the standard 3-clause BSD License

Bionic doesn't want to implement all features of a traditional C library, we only
add features to it as we need them, and we try to keep things as simple and small
as possible. Our goal is not to support scaling to thousands of concurrent threads
on multi-processors machines; we're running this on cell-phones, damnit !!

Note that Bionic doesn't provide a libthread_db or a libm implementation.


Adding new syscalls:
====================

Bionic provides the gensyscalls.py Python script to automatically generate syscall
stubs from the list defined in the file SYSCALLS.TXT. You can thus add a new syscall
by doing the following:

- edit SYSCALLS.TXT
- add a new line describing your syscall, it should look like:

   return_type  syscall_name(parameters)    syscall_number

- in the event where you want to differentiate the syscall function from its entry name,
  use the alternate:

   return_type  funcname:syscall_name(parameters)  syscall_number

- additionally, if the syscall number is different between ARM and x86, use:

   return_type  funcname[:syscall_name](parameters)   arm_number,x86_number

- a syscall number can be -1 to indicate that the syscall is not implemented on
  a given platform, for example:

   void   __set_tls(void*)   arm_number,-1


the comments in SYSCALLS.TXT contain more information about the line format

You can also use the 'checksyscalls.py' script to check that all the syscall
numbers you entered are correct. It does so by looking at the values defined in
your Linux kernel headers. The script indicates where the values are incorrect
and what is expected instead.