1 .\" Copyright (C) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
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25 .\" 2007-10-23 mtk, Nearly a complete rewrite of the earlier page.
26 .TH INTRO 3 2020-11-01 "Linux" "Linux Programmer's Manual"
28 intro \- introduction to library functions
30 Section 3 of the manual describes all library functions excluding the library
31 functions (system call wrappers) described in Section 2,
32 which implement system calls.
34 Many of the functions described in the section are part of the
37 Some functions are part of other libraries (e.g.,
40 or the real-time library,
42 in which case the manual page will indicate the linker
43 option needed to link against the required library
49 for the aforementioned libraries).
52 the programmer must define a feature test macro in order to obtain
53 the declaration of a function from the header file specified
54 in the man page SYNOPSIS section.
55 (Where required, these feature test macros must be defined before including
58 In such cases, the required macro is described in the man page.
59 For further information on feature test macros, see
60 .BR feature_test_macros (7).
63 .\" are various function groups which can be identified by a letter which
64 .\" is appended to the chapter number:
66 .\" These functions, the functions from chapter 2 and from chapter 3S are
67 .\" contained in the C standard library libc, which will be used by
71 .\" These functions are parts of the
73 .\" library. They are contained in the standard C library libc.
75 .\" These functions are contained in the arithmetic library libm. They are
78 .\" FORTRAN compiler by default, but not by the
80 .\" C compiler, which needs the option \fI\-lm\fP.
82 .\" These functions are part of the FORTRAN library libF77. There are no
83 .\" special compiler flags needed to use these functions.
85 .\" Various special libraries. The manual pages documenting their functions
86 .\" specify the library names.
88 Certain terms and abbreviations are used to indicate UNIX variants
89 and standards to which calls in this section conform.
93 .SS Authors and copyright conditions
94 Look at the header of the manual page source for the author(s) and copyright
96 Note that these can be different from page to page!
100 .BR capabilities (7),
103 .BR feature_test_macros (7),
106 .BR path_resolution (7),
110 .BR system_data_types (7)