intro — introduction to library functions
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).
Certain terms and abbreviations are used to indicate UNIX variants and standards to which calls in this section conform. See standards(7).
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)
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
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Copyright (C) 2007 Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END 2007-10-23 mtk, Nearly a complete rewrite of the earlier page. |