@node Contributors, Free Manuals, Platform, Top
@c %MENU% Who wrote what parts of the GNU C Library
@appendix Contributors to @theglibc{}

@Theglibc{} project would like to thank its many contributors.
Without them the project would not have been nearly as successful as
it has been.  Any omissions in this list are accidental.  Feel free to
file a bug in bugzilla if you have been left out or some of your
contributions are not listed.  Please keep this list in alphabetical
order.

@itemize @bullet

@item
Ryan S. Arnold for his improvements for Linux on PowerPC and his direction
as FSF Project Steward for @theglibc{}.

@item
Miles Bader for writing the @code{argp} argument-parsing package, and the
@code{argz}/@code{envz} interfaces.

@item
Jeff Bailey for his maintainership of the HPPA architecture.

@item
Petr Baudis for bug fixes and testing.

@item
Stephen R. van den Berg for contributing a highly-optimized
@code{strstr} function.

@item
Ondrej Bilka for contributing optimized string routines for x64 and various
fixes.

@item
Eric Blake for adding O(n) implementations of @code{memmem},
@code{strstr} and @code{strcasestr}.

@item
Philip Blundell for the ports to Linux/ARM
(@code{arm-@var{ANYTHING}-linuxaout}) and ARM standalone
(@code{arm-@var{ANYTHING}-none}), as well as for parts of the IPv6
support code.

@item
Per Bothner for the implementation of the @code{libio} library which
is used to implement @code{stdio} functions.

@item
Mark Brown for his direction as part of @theglibc{} steering
committee.

@item
Thomas Bushnell for his contributions to Hurd.

@item
Wilco Dijkstra for various fixes.

@item
Liubov Dmitrieva for optimzed string and math functions on x86-64 and
x86.

@item
Ulrich Drepper for his many contributions in almost all parts of
@theglibc{}, including:
@itemize @bullet
@item internationalization support, including the @code{locale} and
@code{localedef} utilities.
@item Linux i386/ELF support
@item the @code{hsearch} and @code{drand48} families of functions,
reentrant @samp{@dots{}@code{_r}} versions of the @code{random}
family; System V shared memory and IPC support code
@item several highly-optimized string functions for i@var{x}86
processors
@item many math functions
@item the character conversion functions (@code{iconv})
@item the @code{ftw} and @code{nftw} functions
@item the floating-point printing function used by @code{printf} and friends
and the floating-point reading function used by @code{scanf},
@code{strtod} and friends
@item the @code{catgets} support and the entire suite of multi-byte
and wide-character support functions (@file{wctype.h}, @file{wchar.h}, etc.).
@item versioning of objects on the symbol level
@end itemize

@item
Richard Earnshaw for continued support and fixes to the various ARM
machine files.

@item
Paul Eggert for the @code{mktime} function and for his direction as
part of @theglibc{} steering committee.

@item
Steve Ellcey for various fixes.

@item
Tulio Magno Quites Machado Filho for adding a new class of installed
headers for low-level platform-specific functionality and one such for
PowerPC.

@item
Mike Frysinger for his maintaining of the IA64 architecture and for
testing and bug fixing.

@item
Michael Glad for the DES encryption function @code{crypt} and related
functions.

@item
Wolfram Gloger for contributing the memory allocation functions
functions @code{malloc}, @code{realloc} and @code{free} and related
code.

@item
Torbj@"orn Granlund for fast implementations of many of the string
functions (@code{memcpy}, @code{strlen}, etc.).

@item
Michael J. Haertel for writing the merge sort function @code{qsort}
and malloc checking functions like @code{mcheck}.

@item
Bruno Haible for his improvements to the @code{iconv} and locale
implementations.

@item
Richard Henderson for the port to Linux on Alpha
(@code{alpha-@var{anything}-linux}).

@item
David Holsgrove for the port to Linux on MicroBlaze.

@item
Daniel Jacobowitz for various fixes and enhancements.

@item
Andreas Jaeger for the port to Linux on x86-64
(@code{x86_64-@var{anything}-linux} and his work on Linux for MIPS
(@code{mips-@var{anything}-linux}), implementing the @file{ldconfig}
program, providing a test suite for the math library and for his
direction as part of @theglibc{} steering committee.

@item
Aurelien Jarno for various fixes.

@item
Jakub Jelinek for implementing a number of checking functions and for
his direction as part of @theglibc{} steering committee.

@item
Geoffrey Keating for the port to Linux on PowerPC
(@code{powerpc-@var{anything}-linux}).

@item
Brendan Kehoe for contributing the port to the MIPS DECStation running
Ultrix 4 (@code{mips-dec-ultrix4}) and the port to the DEC Alpha
running OSF/1 (@code{alpha-dec-osf1}).

@item
Mark Kettenis for implementing the @code{utmpx} interface and an utmp
daemon, and for a Hesiod NSS module.

@item
Andi Kleen for implementing pthreads lock elision with TSX.

@item
Kazumoto Kojima for the port of the Mach and Hurd code to the MIPS
architecture (@code{mips-@var{anything}-gnu}) and for his work on the
SH architecture.

@item
Andreas Krebbel for his work on Linux for s390 and s390x.

@item
Thorsten Kukuk for providing an implementation for NIS (YP) and NIS+,
securelevel 0, 1 and 2 and for the implementation for a caching daemon
for NSS (@file{nscd}).

@item
Jeff Law for various fixes.

@item
Doug Lea for contributing the memory allocation functions
functions @code{malloc}, @code{realloc} and @code{free} and related
code.

@item
Chris Leonard for various fixes and enhancements to localedata.

@item
Stefan Liebler for various fixes.

@item
Hongjiu Lu for providing the support for a Linux 32-bit runtime
environment under x86-64 (x32), for porting to Linux on IA64, for
improved string functions, a framework for testing IFUNC
implementations, and many bug fixes.

@item
Luis Machado for optimized functions on PowerPC.

@item
David J. MacKenzie for his contribution to the @code{getopt}
function and writing the @file{tar.h} header.

@item
Greg McGary for adding runtime support for bounds checking.

@item
Roland McGrath for writing most of @theglibc{} originally, for his
work on the Hurd port, his direction as part of @theglibc{} steering
committee and as FSF Project Steward for @theglibc{}, and for many bug
fixes and reviewing of contributions.

@item
Allan McRae for various fixes.

@item
Jason Merrill for the port to the Sequent Symmetry running Dynix
version 3 (@code{i386-sequent-bsd}).

@item
Chris Metcalf for the port to Linux/Tile
(@code{tilegx-@var{anything}-linux} and
@code{tilepro-@var{anything}-linux}).

@item
David Miller for contributing the port to Linux/Sparc
(@code{sparc*-@var{anything}-linux}).

@item
Alan Modra for his improvements for Linux on PowerPC.

@item
David Mosberger-Tang for contributing the port to Linux/Alpha
(@code{alpha-@var{anything}-linux}).

@item
Stephen Moshier for implementing some 128-bit long double format math
functions.

@item
Stephen Munroe for his port to Linux on PowerPC64
(@code{powerpc64-@var{anything}-linux}) and for adding optimized
implementations for PowerPC.

@item
Joseph S. Myers for numerous bug fixes for the libm functions, for
his maintainership of the ARM and MIPS architectures, improving
cross-compilation and cross-testing of @theglibc{}, expanded
coverage of conformtest, merging the ports/ subdirectory
into the @glibcadj{} main repository and his direction as FSF Project
Steward for @theglibc{}.

@item
Will Newton for contributing some optimized string functions and pointer
encryption support for ARM and various fixes.

@item
Carlos O'Donell for his maintainership of the HPPA architecture, for
maintaining @theglibc{} web pages and wiki, for his direction as FSF
Project Steward for @theglibc{} and various bug fixes.

@item
Alexandre Oliva for adding TLS descriptors for LD and GD on x86 and
x86-64, for the am33 port, for completing the MIPS n64/n32/o32 multilib
port, for thread-safety, async-signal safety and async-cancellation
safety documentation in the manual, for his direction as FSF Project
Maintainer and for various fixes.

@item
Paul Pluzhnikov for various fixes.

@item
Marek Polacek for various fixes.

@item
Siddhesh Poyarekar for various fixes and an implementation of a
framework for performance benchmarking of functions.

@item
Tom Quinn for contributing the startup code to support SunOS shared
libraries and the port to SGI machines running Irix 4
(@code{mips-sgi-irix4}).

@item
Torvald Riegel for the implementation of a new semaphore algorithm.

@item
Pravin Satpute for writing sorting rules for some Indian languages.

@item
Douglas C. Schmidt for writing the quick sort function used as a
fallback by @code{qsort}.

@item
Will Schmidt for optimized string functions on PowerPC.

@item
Andreas Schwab for the port to Linux/m68k
(@code{m68k-@var{anything}-linux}) and for his direction as part of
@theglibc{} steering committee.

@item
Martin Schwidefsky for porting to Linux on s390
(@code{s390-@var{anything}-linux}) and s390x
(@code{s390x-@var{anything}-linux}).

@item
Thomas Schwinge for his contribution to Hurd and the SH architecture.

@item
Carlos Eduardo Seo for optimized functions on PowerPC.

@item
Marcus Shawcroft for contributing the AArch64 port.

@item
Franz Sirl for various fixes.

@item
Jes Sorensen for porting to Linux on IA64 (@code{ia64-@var{anything}-linux}).

@item
Richard Stallman for his contribution to the @code{getopt} function.

@item
Alfred M. Szmidt for various fixes.

@item
Ian Lance Taylor for contributing the port to the MIPS DECStation
running Ultrix 4 (@code{mips-dec-ultrix4}).

@item
Samuel Thibault for improving the Hurd port.

@item
Tim Waugh for the implementation of the POSIX.2 @code{wordexp}
function family.

@item
Eric Youngdale for implementing versioning of objects on the symbol level.

@item
Adhemerval Zanella for optimized functions on PowerPC.

@end itemize

Some code in @theglibc{} comes from other projects and might be under
a different license:

@itemize @bullet
@item
The timezone support code is derived from the public-domain timezone
package by Arthur David Olson and his many contributors.

@item
Some of the support code for Mach is taken from Mach 3.0 by CMU;
the file if_ppp.h is also copyright by CMU, but under a different license;
see the file @file{LICENSES} for the text of the licenses.

@item
The random number generation functions @code{random}, @code{srandom},
@code{setstate} and @code{initstate}, which are also the basis for the
@code{rand} and @code{srand} functions, were written by Earl T. Cohen
for the University of California at Berkeley and are copyrighted by the
Regents of the University of California.  They have undergone minor
changes to fit into @theglibc{} and to fit the @w{ISO C} standard,
but the functional code is Berkeley's.@refill

@item
The Internet-related code (most of the @file{inet} subdirectory) and
several other miscellaneous functions and header files have been
included from 4.4 BSD with little or no modification.  The copying
permission notice for this code can be found in the file @file{LICENSES}
in the source distribution.

@item
The @code{getaddrinfo} and @code{getnameinfo} functions and supporting
code were written by Craig Metz; see the file @file{LICENSES} for
details on their licensing.

@item
The DNS resolver code is taken directly from BIND 4.9.5, which
includes copyrighted code from UC Berkeley and from Digital Equipment
Corporation.  See the file @file{LICENSES} for the text of the DEC license.

@item
The code to support Sun RPC is taken verbatim from Sun's
@w{@sc{rpcsrc-4.0}} distribution; see the file @file{LICENSES} for the
text of the license.

@item
The math functions are taken from @code{fdlibm-5.1} by Sun
Microsystems, as modified by J.T. Conklin, Ian Lance Taylor,
Ulrich Drepper, Andreas Schwab, and Roland McGrath.

@item
Many of the IEEE 64-bit double precision math functions
(in the @file{sysdeps/ieee754/dbl-64} subdirectory) come
from the IBM Accurate Mathematical Library, contributed by IBM.

@item
Many of the IA64 math functions are taken from a collection of
``Highly Optimized Mathematical Functions for Itanium'' that Intel
makes available under a free license; see the file @file{LICENSES} for
details.

@end itemize