Red Hat Enterprise Linux 9 Essentials Book now available.
Purchase a copy of Red Hat Enterprise Linux 9 (RHEL 9) Essentials
Red Hat Enterprise Linux 9 Essentials Print and eBook (PDF) editions contain 34 chapters and 298 pages
3.3. Library and Runtime Details
3.3.1. The GNU C Library
The glibc package contains the GNU C Library. This defines all functions specified by the ISO C standard, POSIX specific features, some Unix derivatives, and GNU-specific extensions. The most important set of shared libraries in the GNU C Library are the standard C and math libraries.
The GNU C Library defines its functions through specific header files, which you can declare in source code. Each header file contains definitions of a group of related facilities; for example, the stdio.h header file defines I/O-specific facilities, while math.h defines functions for computing mathematical operations.
3.3.1.1. GNU C Library Updates
The Red Hat Enterprise Linux 6 version of the GNU C Library features the following improvements over its Red Hat Enterprise Linux 5 version:
Added locales, including:
bo_CN
bo_IN
shs_CA
ber_DZ
ber_MA
en_NG
fil_PH
fur_IT
fy_DE
ha_NG
ig_NG
ik_CA
iu_CA
li_BE
li_NL
nds_DE
nds_NL
pap_AN
sc_IT
tk_TM
Added new interfaces, namely:
preadv
preadv64
pwritev
pwritev64
malloc_info
mkostemp
mkostemp64
Added new Linux-specific interfaces, namely:
epoll_pwait
sched_getcpu
accept4
fallocate
fallocate64
inotify_init1
dup3
epoll_create1
pipe2
signalfd
eventfd
eventfd_read
eventfd_write
Added new checking functions, namely:
asprintf
dprintf
obstack_printf
vasprintf
vdprintf
obstack_vprintf
fread
fread_unlocked
open*
mq_open
For a more detailed list of updates to the GNU C Library, refer to /usr/share/doc/glibc-version/NEWS . All changes as of version 2.6 apply to the GNU C Library in Red Hat Enterprise Linux 6. Some of these changes have also been backported to Red Hat Enterprise Linux 5 versions of glibc.
3.3.1.2. GNU C Library Documentation
The GNU C Library is fully documented in the GNU C Library manual; to access this manual locally, install glibc-devel and run info libc. An upstream version of this book is also available here:
