term% cat index.txt INTRO(3) Library Functions Manual INTRO(3)
NAME
intro - introduction to library functions
SYNOPSIS
#include <stdio.h>
#include <math.h>
DESCRIPTION
This section describes functions that may be found in various li‐
braries, other than those functions that directly invoke UNIX system
primitives, which are described in section 2. Functions are divided
into various libraries distinguished by the section number at the top
of the page:
(3) These functions, together with those of section 2 and those
marked (3S) and (3M), constitute library libc, which is automati‐
cally loaded by the C compiler cc(1) and the Fortran compiler
f77(1). The link editor ld(1) searches this library under option
-lc . Declarations for some of these functions may be obtained
from include files indicated on the appropriate pages.
(3F) These functions are in the Fortran library, libF77, automatically
loaded by the Fortran compiler, and searched under option -lF77
of the link editor.
(3M) These functions constitute the math library, part of libc. (On
other systems they must be loaded by -lm). Declarations for
these functions may be obtained from the include file <math.h>.
(3S) These functions constitute the `standard IO package', see
stdio(3), part of libc already mentioned. Declarations for these
functions may be obtained from the include file <stdio.h>.
(3X) Various specialized libraries have not been given distinctive
captions. Files in which such libraries are found are named on
appropriate pages.
FILES
/lib/libc.a
SEE ALSO
stdio(3), nm(1), ld(1), cc(1), f77(1), intro(2)
DIAGNOSTICS
Functions in the math library (3M) may return conventional values when
the function is undefined for the given arguments or when the value is
not representable. In these cases the external variable errno (see in‐
tro(2)) is set to the value EDOM or ERANGE, defined in the include file
<math.h>.
INTRO(3)