AT&T UNIX™PC Unix System V Users Manual - tenox

INTR0 ( 3 ) INTR0 ( 3 )
NAME intro - introduction to subroutines and libraries
SYNOPSIS
#include
#include < ma.th.h >
DESCRIPTION
This section describes functions found in various libraries, other
than those functions that directly invoke UNIX system primitives,
which are described in Section 2 of this volume. Certain major
collections are identified by a letter after the section number:
(3C) These functions, together with those of Section 2 and
those marked (3S), constitute the Standard C Library
libc, which is automatically loaded by the C compiler,
cc( l). The link editor ld( l) searches this library under
the -lc option. Declarations for some of these functions
may be obtained from #include files indicated on the
appropriate pages.
(3M) These functions constitute the Math Library, libm. They
are automatically loaded as needed by the FORTRAN compiler.
They are not automatically loaded by the C compiler,
cc(l); however, the link editor searches this library
under the -lm option. Declarations for these functions
may be obtained from the #include file .
(3T) These functions constitute the UNIX PC "terminal access
method" (tam) library.
(3S) These functions constitute the "standard 1/0 package"
(see stdio (3S)). These functions are in the library libc,
already mentioned. Declarations for these functions may
be obtained from the #include file .
(3X) Various specialized libraries. The files in which these
libraries are found are given on the appropriate pages.
DEFINITIONS
A character is any bit pattern able to fit into a byte on the
machine. The null character is a character with value 0,
represented in the C language as '\0'. A character array is a
sequence of characters. A null-terminated character array is a
sequence of characters, the last of which is the null character. A
string is a designation for a null-terminated character array . The
null string is a character array containing only the null character.
A NULL pointer is the value that is obtained by casting 0 into a
pointer. The C language guarantees that this value will not
match that of any legitimate pointer, so many functions that
return pointers return it to indicate an error. NULL is defined as
0 in ; the user can include his own definition if he is
not using .
FILES
/lib/libc.a
/lib/libm.a
- 1 -