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-.\" Copyright (C) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2007-10-23 mtk, Nearly a complete rewrite of the earlier page.
-.TH intro 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-intro \- introduction to library functions
-.SH 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.
-.P
-Many of the functions described in the section are part of the
-Standard C Library
-.RI ( libc ).
-Some functions are part of other libraries
-(e.g.,
-the math library,
-.IR libm ,
-or the real-time library,
-.IR librt )
-in which case the manual page will indicate
-the linker option needed to link against the required library
-(e.g.,
-.I \-lm
-and
-.IR \-lrt ,
-respectively,
-for the aforementioned libraries).
-.P
-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
-.I feature test macros
-must be defined before including
-.I any
-header files.)
-In such cases,
-the required macro is described in the man page.
-For further information on feature test macros,
-see
-.BR feature_test_macros (7).
-.\"
-.\" There
-.\" are various function groups which can be identified by a letter which
-.\" is appended to the chapter number:
-.\" .IP (3C)
-.\" These functions,
-.\" the functions from chapter 2 and from chapter 3S are
-.\" contained in the C standard library libc,
-.\" which will be used by
-.\" .BR cc (1)
-.\" by default.
-.\" .IP (3S)
-.\" These functions are parts of the
-.\" .BR stdio (3)
-.\" library.  They are contained in the standard C library libc.
-.\" .IP (3M)
-.\" These functions are contained in the arithmetic library libm.  They are
-.\" used by the
-.\" .BR f77 (1)
-.\" FORTRAN compiler by default,
-.\" but not by the
-.\" .BR cc (1)
-.\" C compiler,
-.\" which needs the option \fI\-lm\fP.
-.\" .IP (3F)
-.\" These functions are part of the FORTRAN library libF77.  There are no
-.\" special compiler flags needed to use these functions.
-.\" .IP (3X)
-.\" Various special libraries.  The manual pages documenting their functions
-.\" specify the library names.
-.SS Subsections
-Section 3 of this manual is organized into subsections
-that reflect the complex structure of the standard C library
-and its many implementations:
-.IP \[bu] 3
-3const
-.IP \[bu]
-3head
-.IP \[bu]
-3type
-.P
-This difficult history frequently makes it a poor example to follow
-in design,
-implementation,
-and presentation.
-.P
-Ideally,
-a library for the C language
-is designed such that each header file
-presents the interface to a coherent software module.
-It provides a small number of function declarations
-and exposes only data types and constants that
-are required for use of those functions.
-Together,
-these are termed an API or
-.IR "application program interface" .
-Types and constants to be shared among multiple APIs
-should be placed in header files that declare no functions.
-This organization permits a C library module
-to be documented concisely with one header file per manual page.
-Such an approach
-improves the readability and accessibility of library documentation,
-and thereby the usability of the software.
-.SH STANDARDS
-Certain terms and abbreviations are used to indicate UNIX variants
-and standards to which calls in this section conform.
-See
-.BR standards (7).
-.SH NOTES
-.SS 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!
-.SH SEE ALSO
-.BR intro (2),
-.BR errno (3),
-.BR capabilities (7),
-.BR credentials (7),
-.BR environ (7),
-.BR feature_test_macros (7),
-.BR libc (7),
-.BR math_error (7),
-.BR path_resolution (7),
-.BR pthreads (7),
-.BR signal (7),
-.BR standards (7),
-.BR system_data_types (7)