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       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
       aforementioned 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.  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), feature_test_macros(7), libc(7), standards(7)


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