mirror of https://github.com/mkerrisk/man-pages
97 lines
3.5 KiB
Groff
97 lines
3.5 KiB
Groff
.\" Copyright (C) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" 2007-10-23 mtk, Nearly a complete rewrite of the earlier page.
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.TH INTRO 3 2007-10-23 "Linux" "Linux Programmer's Manual"
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.SH NAME
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intro \- Introduction to library functions
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.SH DESCRIPTION
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Section 3 of the manual describes all library functions excluding the library
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functions (system call wrappers) described in section 2,
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which implement system calls.
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Many of the functions described in the section are part of the
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Standard C Library
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.RI ( libc ).
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Some functions are part of other libraries (e.g.,
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the math library,
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.IR libm ,
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or the real-time library,
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.IR librt )
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in which case the manual page will indicate the linker
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option needed to link against the required library
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(e.g.,
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.I \-lm
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and
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.IR \-lrt ,
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respectively,
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for the aforementioned libraries).
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In some cases,
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the programmer must define a feature test macro in order to obtain
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the declaration of a function from the header file specified
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in the man page SYNOPSIS section.
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In such cases, the required macro is described in the man page.
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For further information on feature test macros, see
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.BR feature_test_macros (7).
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.\"
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.\" There
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.\" are various function groups which can be identified by a letter which
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.\" is appended to the chapter number:
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.\" .IP (3C)
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.\" These functions, the functions from chapter 2 and from chapter 3S are
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.\" contained in the C standard library libc, which will be used by
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.\" .BR cc (1)
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.\" by default.
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.\" .IP (3S)
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.\" These functions are parts of the
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.\" .BR stdio (3)
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.\" library. They are contained in the standard C library libc.
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.\" .IP (3M)
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.\" These functions are contained in the arithmetic library libm. They are
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.\" used by the
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.\" .BR f77 (1)
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.\" FORTRAN compiler by default, but not by the
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.\" .BR cc (1)
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.\" C compiler, which needs the option \fI\-lm\fP.
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.\" .IP (3F)
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.\" These functions are part of the FORTRAN library libF77. There are no
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.\" special compiler flags needed to use these functions.
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.\" .IP (3X)
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.\" Various special libraries. The manual pages documenting their functions
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.\" specify the library names.
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.SH "CONFORMING TO"
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Certain terms and abbreviations are used to indicate Unix variants
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and standards to which calls in this section conform.
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See
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.BR standards (7).
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.SH NOTES
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.SS Authors and Copyright Terms
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Look at the header of the manual page source for the author(s) and copyright
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conditions.
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Note that these can be different from page to page!
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.SH "SEE ALSO"
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.BR intro (2),
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.BR errno (3),
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.BR feature_test_macros (7),
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.BR standards (7)
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