GNU C Library 2.21

GNU C Library is the most important library software of a GNU/Linux operating system

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What's new in GNU C Library 2.21:

  • The following bugs are resolved with this release: 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498, 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618, 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370, 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555, 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589, 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647, 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719, 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747, 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797, 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885, 17892.
  • CVE-2015-1472 Under certain conditions wscanf can allocate too little memory for the to-be-scanned arguments and overflow the allocated buffer. The implementation now correctly computes the required buffer size when using malloc.
  • A new semaphore algorithm has been implemented in generic C code for all machines. Previous custom assembly implementations of semaphore were difficult to reason about or ensure that they were safe. The new version of semaphore supports machines with 64-bit or 32-bit atomic operations. The new semaphore algorithm is used by sem_init, sem_open, sem_post, sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
  • Port to Altera Nios II has been contributed by Mentor Graphics.
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GPL (GNU General Public License) 
Roland McGrath
2.5/5 30
ROOT \ System \ System Administration
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GNU C Library
The GNU C Library is an open source, free and powerful library software for any GNU/Linux distribution. It is also known as Glibc and required by any UNIX-like computer operating system. GNU C Library is in charge of defining the system calls, as well as various other basic functionality, such as malloc, open, exit, printf, etc.

Used by default in all Linux kernel-based operating systems

The GNU C Library is installed and used by default in all Linux kernel-based operating system, designed from the ground up to act as the main C library in GNU systems and any other operating system powered by the Linux kernel.

Designed to be portable

Glibc is a high performance C library, written entirely in the C programming language. It is designed to be portable, internationalized, and engineered to support all relevant standards, including POSIX.1-2008 and ISO C11.

Supports features of well known UNIX variants

While the GNU C Library has a fully internationalized interface, it tries to support features of well known UNIX variants, such as BSD and System V, thanks to its built-in compatibility modes.

Getting started with GNU C Library

While the GNU C Library is installed by default in almost all GNU/Linux operating systems, you can also reinstall it yourself using the source package distributed on its website or Softpedia free of charge. To begin, download and save the archive on your Home directory.

Unpack the archive with an archive manager utility, open a terminal window, go to the location where the archive files have been extracted, run the ‘./configure’ command to configure the program (see the ‘./configure --help’ command for various optimization options).

Then run the ‘make’ command to compile the library, which can be installed system wide by running either of the ‘make install’ or ‘sudo make install’ commands, depending if your root or a privileged user.

GNU C Library was reviewed by , last updated on February 7th, 2015

#C library #Linux library #Glibc library #Glibc #runtime #library #system

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