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 feature_test_macros(7).

CONFORMING TO         top

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

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 page!

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 5.13 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
       https://www.kernel.org/doc/man-pages/.

Linux                          2020-11-01                       INTRO(3)

Pages that refer to this page: intro(2)

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