intro(3) - phpMan

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

NAME
       intro - introduction to library functions

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.

       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 aforemen-
       tioned libraries).

       In some cases, the programmer must define a feature test macro in order to obtain the dec-
       laration  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 in-
       formation on feature test macros, see feature_test_macros(7).

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

NOTES
   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!

SEE ALSO
       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), sys-
       tem_data_types(7)

COLOPHON
       This page is part of release 5.10 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/.

Linux                                       2020-11-01                                   INTRO(3)

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