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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 func-
       tions (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 SYNOP-
       SIS  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 Terms
       Look at the header of the manual page source for the author(s) and copyright condi-
       tions.  Note that these can be different 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 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2009-02-01                          INTRO(3)

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