intro(3) — Linux manual page


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

NAME         top

       intro - introduction to library functions

DESCRIPTION         top

       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.  (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

CONFORMING TO         top

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

NOTES         top

   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

SEE ALSO         top

       intro(2), errno(3), capabilities(7), credentials(7), environ(7),
       feature_test_macros(7), libc(7), math_error(7), path_resolution(7),
       pthreads(7), signal(7), standards(7), system_data_types(7)

COLOPHON         top

       This page is part of release 5.09 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                            2020-11-01                         INTRO(3)

Pages that refer to this page: intro(2)