bionic/libc
Elliott Hughes bf018299bd Fix strerror(3) for errno 0.
Everyone else's C library says "Success". We say "Unknown error: 0", which
isn't really true.

Change-Id: I9f9054779123eda996634e5f7a277789b6805809
2011-05-13 10:54:34 -07:00
..
arch-arm Merge commit '2f169162462e44d7aa6443e682b15fc756c2e4ad' into honeycomb-mr1-release-to-dalvik-dev 2011-03-28 15:40:33 -07:00
arch-sh Add support for the utimensat(2) syscall to bionic. 2011-03-24 18:18:48 -07:00
arch-x86 Add support for the utimensat(2) syscall to bionic. 2011-03-24 18:18:48 -07:00
bionic Ignore property set timeouts. 2011-04-01 10:53:12 -07:00
docs libc: Fix the definition of SIGRTMAX 2010-12-20 15:58:06 +01:00
include Fix strerror(3) for errno 0. 2011-05-13 10:54:34 -07:00
inet added missing ether_aton and ether_ntoa 2010-08-25 08:46:23 -07:00
kernel Update USB accessory kernel header to include serial number support 2011-03-14 17:50:44 -04:00
netbsd libc: Fix leak in the DNS thread-specific state. 2011-03-18 18:08:08 +01:00
private Fix __get_tls() in static C library to use kernel helpers. 2010-08-27 08:19:19 -07:00
regex Remove compiler warnings when building Bionic. 2010-06-22 17:51:41 -07:00
stdio Fix the handle locking in stdio 2011-02-14 09:32:56 -08:00
stdlib Bug 3330205 Thread safety for bignum powers of 5 2011-01-17 11:32:11 -08:00
string Fix strerror(3) for errno 0. 2011-05-13 10:54:34 -07:00
tools Merge changes I8c481c89,I791406f8,I5f09cef8 2011-02-18 15:22:27 -08:00
tzcode Bug 3330205 Thread safe strptime implementation 2011-01-11 09:33:04 -08:00
unistd am 84f4753d: am 56faf66f: raise: Send signal to current thread 2011-01-21 12:40:07 -08:00
wchar wchar.h: improve wchar_t support in Bionic 2010-06-15 07:04:41 -07:00
zoneinfo Add MODULE_LICENSE_PUBLIC_DOMAIN for the tzdata. 2011-02-15 14:12:24 -08:00
Android.mk Added _memmove_words 2011-02-04 20:06:04 -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 Clean up NOTICE files. 2010-10-19 15:12:40 -07:00
README Add an 's and a . to the bionic/libc README. 2009-07-23 17:41:47 -07:00
SYSCALLS.TXT Add support for the utimensat(2) syscall to bionic. 2011-03-24 18:18:48 -07:00

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.