INTRO(3)                   Linux Programmer's Manual                  INTRO(3)

       intro - introduction to library functions

       Section  3  of the manual describes all library functions excluding the
       library functions (system call wrappers) described in Section 2,  which
       implement system calls.

       Many of the functions described in the section are part of the Standard
       C Library (libc).  Some functions are part of  other  libraries  (e.g.,
       the  math library, libm, or the real-time library, librt) in which case
       the manual page will indicate the linker option needed to link  against
       the  required library (e.g., -lm and -lrt, respectively, for the afore-
       mentioned libraries).

       In some cases, the programmer must define a feature test macro in order
       to  obtain the declaration of a function from the header file specified
       in the man page SYNOPSIS section.  (Where required, these feature  test
       macros  must  be  defined  before including any header files.)  In such
       cases, the required macro is described in the man  page.   For  further
       information on feature test macros, see feature_test_macros(7).

       Certain  terms and abbreviations are used to indicate UNIX variants and
       standards to which calls in this section conform.  See standards(7).

   Authors and copyright conditions
       Look at the header of the manual page  source  for  the  author(s)  and
       copyright  conditions.   Note  that these can be different from page to

       intro(2), errno(3), capabilities(7), credentials(7),  environ(7),  fea-
       ture_test_macros(7),    libc(7),   math_error(7),   path_resolution(7),
       pthreads(7), signal(7), standards(7)

       This page is part of release 4.15 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at

Linux                             2017-09-15                          INTRO(3)
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