Embedded C library http://uclibc-ng.org

Peter S. Mazinger d3b81557ec nanosleep.c: use cancel.h 13 years ago
docs 37988beac7 PORTING: remove obsolete comment about readelf 12 years ago
extra 5c7e1909e1 ssp: rework, sync messages with the ones in glibc 12 years ago
include f74f77b155 fcntl: add cancellation to fcntl64, use cancel.h 12 years ago
ldso 26284b4021 add LDSO_SAFE_RUNPATH config option 12 years ago
libc d3b81557ec nanosleep.c: use cancel.h 12 years ago
libcrypt 1533e2876b remove __FORCE_GLIBC 12 years ago
libintl 59f3d4df3b intl, nptl_db: fix prerequisites 14 years ago
libm 83625362e0 s_scalbn.c: since we have strong_alias_untyped now, use it 12 years ago
libnsl c8eb6b4c7a libnsl,libresolv: do not include unneeded features.h 12 years ago
libpthread 4228d2f34c ptfork.c: use strong_alias for vfork 12 years ago
libresolv c8eb6b4c7a libnsl,libresolv: do not include unneeded features.h 12 years ago
librt c28cabb179 Reorder includes and include only what is necessary 12 years ago
libubacktrace 11d8a813ed libubacktrace: arm: Fix typo in assert 12 years ago
libutil f4eebb6146 Add Makefile support for DSBT ELF. 13 years ago
test 26284b4021 add LDSO_SAFE_RUNPATH config option 12 years ago
utils 508b20ead1 make UCLIBC_HAS_PROGRAM_INVOCATION_NAME and UCLIBC_HAS___PROGNAME independent options 12 years ago
.gitignore 30c4dd1f3a .gitignore: Ignore dump files 12 years ago
COPYING.LIB 751dd180c3 Update license file to Lesser GPL v2.1 19 years ago
COPYING.LIB.boilerplate 99eb65208a boilerplate license we use 18 years ago
Changelog 58a0daa6a5 add MULTILIB_DIR: Path component for libdirs 14 years ago
DEDICATION.mjn3 38583d5986 Today's Toni's birthday. Seems an appropriate day to add this. 21 years ago
INSTALL ae14cd49a8 buildsys: s/CROSS/CROSS_COMPILE/g 13 years ago
MAINTAINERS 00ebae02f6 fix compilation of linuxthreads for sparc 15 years ago
Makefile 105ceb0fdc always define CONFIG_SHELL 15 years ago
Makefile.help ed25cd80ed buildsys: fix typo in help 12 years ago
Makefile.in 9f68f0cbf8 cancel.h: add generic file to ease cancellation support 12 years ago
Makerules b7792601c9 Makerules: Remove duplicated slashes in interp.c 12 years ago
README 331634d4c1 copyright update 18 years ago
Rules.mak 0bbae4cb66 Rules.mak: add ldso search paths independently of NPTL 12 years ago
TODO f69319d5a7 libdl: rudimentary locking for dlopen/dlsym/dlclose 13 years ago

README


uClibc - a Small C Library for Linux
Erik Andersen

uClibc (aka Clibc/pronounced yew-see-lib-see) is a C library for
developing embedded Linux systems. It is much smaller than the
GNU C Library, but nearly all applications supported by glibc
also work perfectly with uClibc. Porting applications from glibc
to uClibc typically involves just recompiling the source code.
uClibc even supports shared libraries and threading. It currently
runs on standard Linux and MMU-less (also known as Clinux)
systems with support for alpha, ARM, cris, e1, h8300, i386, i960,
m68k, microblaze, mips/mipsel, PowerPC, SH, SPARC, and v850
processors.

If you are building an embedded Linux system and you find that
glibc is eating up too much space, you should consider using
uClibc. If you are building a huge fileserver with 12 Terabytes
of storage, then using glibc may make more sense. Unless, for
example, that 12 Terabytes will be Network Attached Storage and
you plan to burn Linux into the system's firmware...

uClibc is maintained by Erik Andersen and is licensed under the
GNU LESSER GENERAL PUBLIC LICENSE. This license allows you to
make closed source commercial applications using an unmodified
version of uClibc (Please consider sharing some of the money you
make ;-). You do not need to give away all your source code just
because you use uClibc and/or run on Linux. You should, however,
carefuly review the license and make certain you understand and
abide by it strictly.


For installation instructions, see the file INSTALL.

uClibc strives to be standards compliant, which means that most
documentation written for SuSv3, or for glibc also applies to
uClibc functions. However, many GNU extensions are not supported
because they have not been ported, or more importantly, would
increase the size of uClibc disproportional to the added
functionality. There is some discussion of these differences
in the "docs" directory.

Additional information (recent releases, FAQ, mailing list, bugs,
etc.) can be found at http://www.uclibc.org/.

uClibc may be freely modified and distributed under the terms of
the GNU Lesser General Public License, which can be found in the
file COPYING.LIB.

Please Note:

There is an unwholesomely huge amount of code out there
that depends on the presence of GNU libc header files.
We have GNU libc compatible header files. So we have
committed a horrible sin in uClibc. We _lie_ and claim
to be GNU libc in order to force these applications to
work as their developers intended. This is IMHO,
pardonable, since these defines are not really intended
to check for the presence of a particular library, but
rather are used to define an _interface_. Some programs
are especially chummy with glibc, and may need this
behavior disabled by adding CFLAGS+=-D__FORCE_NOGLIBC

If you want to make special exceptions in your code which are
specifically for uClibc, you can make certain to include features.h,
and then have your code check for uClibc as follows:

#ifdef __UCLIBC__
do_something_special();
#endif

And most of all, be sure to have some fun! :-)
-Erik