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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 man-
       ual 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 Terms
       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 page!

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

       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at

Linux                             2009-02-01                          INTRO(3)