1INTRO(3)                   Linux Programmer's Manual                  INTRO(3)
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NAME

6       intro - introduction to library functions
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DESCRIPTION

9       Section  3  of the manual describes all library functions excluding the
10       library functions (system call wrappers) described in Section 2,  which
11       implement system calls.
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13       Many of the functions described in the section are part of the Standard
14       C Library (libc).  Some functions are part of  other  libraries  (e.g.,
15       the  math library, libm, or the real-time library, librt) in which case
16       the manual page will indicate the linker option needed to link  against
17       the  required library (e.g., -lm and -lrt, respectively, for the afore‐
18       mentioned libraries).
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20       In some cases, the programmer must define a feature test macro in order
21       to  obtain the declaration of a function from the header file specified
22       in the man page SYNOPSIS section.  (Where required, these feature  test
23       macros  must  be  defined  before including any header files.)  In such
24       cases, the required macro is described in the man  page.   For  further
25       information on feature test macros, see feature_test_macros(7).
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CONFORMING TO

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

32   Authors and copyright conditions
33       Look at the header of the manual page  source  for  the  author(s)  and
34       copyright  conditions.   Note  that these can be different from page to
35       page!
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SEE ALSO

38       intro(2), errno(3), capabilities(7), credentials(7),  environ(7),  fea‐
39       ture_test_macros(7),    libc(7),   math_error(7),   path_resolution(7),
40       pthreads(7), signal(7), standards(7), system_data_types(7)
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COLOPHON

43       This page is part of release 5.12 of the Linux  man-pages  project.   A
44       description  of  the project, information about reporting bugs, and the
45       latest    version    of    this    page,    can     be     found     at
46       https://www.kernel.org/doc/man-pages/.
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50Linux                             2020-11-01                          INTRO(3)
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