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           The  term  "libc"  is  commonly used as a shorthand for the "standard C
           library", a library of standard functions that can be  used  by  all  C
           programs  (and  sometimes  by programs in other languages).  Because of
           some history (see below), use of the term "libc" to refer to the  stan-
           dard C library is somewhat ambiguous on Linux.
           By  far  the  most  widely used C library on Linux is the GNU C Library
           often referred to as glibc.  This is the C  library  that  is  nowadays
           used  in all major Linux distributions.  It is also the C library whose
           details are documented in the relevant pages of the  man-pages  project
           (primarily in Section 3 of the manual).  Documentation of glibc is also
           available in the glibc manual, available via  the  command  info  libc.
           Release  1.0  of glibc was made in September 1992.  (There were earlier
           0.x releases.)  The next major release of glibc was 2.0, at the  begin-
           ning of 1997.
           The  pathname  /lib/ (or something similar) is normally a sym-
           bolic link that points to the location of the glibc library,  and  exe-
           cuting  this  pathname  will cause glibc to display various information
           about the version installed on your system.
       Linux libc
           In the early to mid 1990s, there was for a while Linux libc, a fork  of
           glibc  1.x  created by Linux developers who felt that glibc development
           at the time was not sufficing for the  needs  of  Linux.   Often,  this
           library  was  referred  to  (ambiguously)  as  just "libc".  Linux libc
           released major versions 2, 3, 4, and 5 (as well as many minor  versions
           of those releases).  For a while, Linux libc was the standard C library
           in many Linux distributions.   However,  notwithstanding  the  original
           motivations  of  the  Linux  libc  effort,  by  the  time glibc 2.0 was
           released, it was clearly superior to Linux libc, and  all  major  Linux
           distributions  that  had  been  using  Linux libc soon switched back to
           glibc.  (Since this switch occurred over a  decade  ago,  man-pages  no
           longer  takes  care  to document Linux libc details.  Nevertheless, the
           history is visible in vestiges of information  about  Linux  libc  that
           remain  in  some  manual  pages, in particular, references to libc4 and
       Other C libraries
           There are various other less widely used C libraries for Linux.   These
           libraries  are  generally smaller than glibc, both in terms of features
           and memory footprint, and often intended for building  small  binaries,
           perhaps targeted at development for embedded Linux systems.  Among such
           libraries   are   uClibc    (    and    dietlibc
           (   Details of these libraries are gener-
           ally not covered by the man-pages project.


           syscalls(2),  getauxval(3),   proc(5),   feature_test_macros(7),   man-
           pages(7), standards(7), vdso(7)

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