Free libraries software for linux

LBC Libraries is a set of easy C libraries that provide classical data types and structures (string, hash, queue, stack, tree).
LBC Libraries package is focused on simplicity and portability. It uses ANSI C (C98 standard not required), and provides the most generic approach possible so that queues can have items of different types, hashes can have keys of different data types, trees can be binary trees or have arbitrary numbers of branches, etc.
Enhancements:
- This release adds minor API changes, enhances the documentation, and fixes major bugs in LBCstring.

DAEMon Raco Libraries (DRLibs) is a collection of useful functions, objects, and routines for C++.
Enhancements:
- This release adds new libraries to manage object lists: doublelist.dr.h, simplelist.dr.h, and sortedlist.dr.h.

The Adobe Source Libraries (ASL) are a collection of C++ libraries building foundation technology to allow the construction of commercial applications by assembling generic algorithms through declarative descriptions.
Enhancements:
- GIL version 2.1 (support for sub-byte aligned pixel values in images).
- An ASL version_0 namespace has been introduced to maintain binary compatibility going forward.
- There are poly< > library improvements. adobe/vector.hpp and adobe/closed_hash.hpp have been added as generic containers.
- There are many other improvements.

Ham Radio Control Libraries is a development effort to provide a consistent interface for programmers wanting to incorporate radio control in their programs.

Hamlib is not a complete user application, rather, it is a software layer intended to make controlling various radios and other shack hardware much easier.

Hamlib will allow authors of such software as logging programs, digital communications programs, or those wanting to develop the ultimate radio control software to concentrate on the user interface and the basic function of the program rather than radio control.

Most recent amateur radio transceivers allow external control of their functions through a serial interface. Unfortunately, control commands are not always consistent across a manufacturers product line and each manufacturers product line differs greatly from its competitors.

Hamlib attempts to solve this problem by presenting a "virtual radio" to the programmer by providing an API to actions such as setting a given VFOs frequency, setting the operating mode, querying the radio of its current status and settings, and giving the application a list of a given radios capabilities. Unfortunately, what can be accomplished by hamlib is limited by the radios themselves and some offer very limited capability.

T28 library is a simple library that allows interaction with a Ericsson T28 phone (and probably works with other models as well). T28 library does not have SMS support.
Main features:
- load/save phonebook
- set language
- set audio mode selection
- get battery properties (level, temperature, etc)works only on T28
- get signal level
- send keys to mobile device
- set date/time
Enhancements:
- Lots of documentation was added.
- The code was cleaned up and tested with other SE models.
- Minor bugs were fixed.

Ssh library was designed to be used by programmers needing a working SSH implementation by the mean of a library. Runs only on x86 linux, bsd and MacOS X.
libssh is a C library to access SSH 2 services from a program. It can remotely execute programs, transfer files, and serve as a secure and transparent tunnel for remote programs. Its Secure FTP implementation can play with remote files easily, without third-party programs others than libcrypto (from OpenSSL).
Main features:
- Full C library functions for manipulating a client-side SSH connection
- Lesser GPL licensing -SSH2 protocol compliant
- Fully configurable sessions
- Support for AES-128,AES-192,AES-256,blowfish, in cbc mode
- Use multiple SSH connections in a same process, at same time
- Use multiple channels in the same connection
- Thread safety when using different sessions at same time
- Basic but correct SFTP implementation (secure file transfer)
- RSA and DSS server public key supported
- Compression support (with zlib)
- Public key (RSA and DSS), password and keyboard-interactive authentication
- A complete documentation about its API
- Runs and tested under amd64, x86, arm, sparc32, ppc under Linux, Bsd, MacosX and Solaris
- A developer listening to you
Enhancements:
- Connection timeout support
- Keyboard-interactive authentication (used by Pam with SSH)
- Server public keys management
- 64 bits cpu support
- Enhanced documentation
- and of course a huge number of bugfixe

GNU C library (glibc) is one of the most important components of GNU Hurd and most modern Linux distributions.

GNU C library is used by almost all C programs and provides the most essential program interface.

The history of Unix and various standards determine much of the interface of the C library. In general the GNU C library supports the ISO C and POSIX standards. We also try to support the features of popular Unix variants (including BSD and System V) when those do not conflict with the standards. Different compatibility modes (selectable when you compile an application) allow the peaceful coexistence of compatibility support for different varieties of Unix.

The GNU C library is primarily designed to be a portable and high performance C library.

It follows all relevant standards (ISO C 99, POSIX.1c, POSIX.1j, POSIX.1d, Unix98, Single Unix Specification). It is also internationalized and has one of the most complete internationalization interfaces known.

ShmFIFO library provides an easy-to-use interface to shared memory for programs where one process needs to send blocks of data to other processes.

It was developed because pipe(2) and mkfifo(3) have a very small buffer size (4k) and are unsuitable for many applications. Shmfifo allows you to put a block of data in shared memory, get the oldest block of data from shared memory.

ShmFIFO library also has the feature to share one instance of a private data structure among all processes which use the library.

How to use shmfifo

Before using, shared memory should be created. After creating shared memory, process which wants to use it, should attach to memory. Then it can put and get blocks to FIFO. After process is finished working with FIFO, it calls shfifo_detach. When no processes will use FIFO, shared memory should be deallocated.

Usally, lifecycle of shmfifo-based program is following:

[parent] shmfifo_create
[parent] fork(2)
[both] shmfifo_attach
[both] shmfifo_put, shmfifo_get (many times)
[both] shmfifo_detach
[parent] wait(2) or waitpid(2)
[child] exit
[parent] shmfifo_dealloc

shmfifo comes with test.c program, which is good sample of how to write programs with shmfifo. It forks into 2 processes, parent generated variable-length blocks, writes checksum into each block and put it into FIFO. Child gets blocks from fifo, check if checksum is valid (its always valid if there is no bug in program) and prints debug info. after large number of blocks gets transferred, both processes are exit.

Additionally, shmfifo allows processes to share one private structure. test.c uses this structure to store counter, which is increased each time when parent cannot put block to FIFO because its already full and has to wait until child will get block. If small amount of memory allocated for FIFO, then parent will wait more often.

Installation:

make
make test
su -
make install

test.c is sample test program which is builts into test binary. You can run it to test if library is working