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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 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

       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 different from page to page!

SEE ALSO

       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

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       information  about  reporting  bugs,  and  the  latest  version  of  this   page,   can   be   found   at
       https://www.kernel.org/doc/man-pages/.