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



NAME
       intro - Introduction to library functions

DESCRIPTION
       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 indi-
       cate the linker option needed to link against the required library (e.g., -lm and -lrt, respectively, for  the  aforemen-
       tioned 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).

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

NOTES
   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  differ-
       ent from page to page!

SEE ALSO
       intro(2), errno(3), feature_test_macros(7), libc(7), standards(7)

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2010-02-03                                                   INTRO(3)