bionic/libc
Pavel Chupin b7beb69075 Add link.h for all platforms with dl_phdr_info
This header is used on bionic build and should be propagated into
sysroot on toolchain rebuild. Discussion re. this header is here:
http://gcc.gnu.org/ml/gcc-patches/2012-08/msg00936.html

It is available already in mips NDK platforms:
development/ndk/platforms/android-9/arch-mips/include/link.h

Change-Id: I39ff467cdac9f448e31c11ee3e14a6200e82ab57
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
2012-08-17 12:44:23 -07:00
..
arch-arm Add link.h for all platforms with dl_phdr_info 2012-08-17 12:44:23 -07:00
arch-mips Add unshare() syscall. 2012-08-10 12:57:43 -07:00
arch-x86 enable clone system call for x86 2012-08-15 17:04:50 -07:00
bionic Add link.h for all platforms with dl_phdr_info 2012-08-17 12:44:23 -07:00
docs libc: Fix the definition of SIGRTMAX 2010-12-20 15:58:06 +01:00
include Add link.h for all platforms with dl_phdr_info 2012-08-17 12:44:23 -07:00
inet inet_ntop: pass the size of tmp to snprintf() 2012-06-11 16:00:52 -07:00
kernel Update arch-mips/asm/unistd.h for the newer syscalls 2012-08-13 11:54:53 -07:00
netbsd am c5cab345: am 028ccf5d: Merge "Avoid multiple dns lookups for the same query" 2012-06-12 15:56:29 -07:00
private Clean up the linker a bit, remove prelinking support. 2012-08-07 11:41:10 -07:00
stdio vfprintf: fix spelling. 2012-07-25 16:01:38 -07:00
stdlib fix __cxa_finalize() implementation to be thread safe. 2012-07-31 12:30:28 +02:00
string Revert "Revert "Switch to NetBSD's strxfrm(3)."" 2012-08-10 12:10:10 -07:00
tools Sort NOTICE entries. 2012-08-14 15:04:05 -07:00
tzcode libc: remove private declarations from <time.h> and <resolv.h> 2012-01-13 14:24:08 +01:00
unistd Enhance getcwd(3) to handle NULL like glibc. 2012-08-16 15:59:12 -07:00
upstream-netbsd Switch to the current NetBSD regex implementation. 2012-08-15 15:39:11 -07:00
wchar wchar.h: improve wchar_t support in Bionic 2010-06-15 07:04:41 -07:00
zoneinfo Add dependencies on all the makefiles. 2012-08-13 14:06:05 -07:00
Android.mk Enhance getcwd(3) to handle NULL like glibc. 2012-08-16 15:59:12 -07:00
CAVEATS 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 Switch to the current NetBSD regex implementation. 2012-08-15 15:39:11 -07:00
README Add an 's and a . to the bionic/libc README. 2009-07-23 17:41:47 -07:00
SYSCALLS.TXT Merge "MIPS support to sigsuspend and sigwait routines" 2012-08-10 15:05:36 -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.