NAME
intro — introduction to subroutines and libraries
DESCRIPTION
This section describes functions found
in various libraries, other than those functions
that directly invoke
HP-UX
system primitives,
which are described in Section (2) of this volume.
Certain major collections are identified by a
letter after the section identifier (3):
- (3C)
These functions, together with the Operating System Calls and those
marked (3S), constitute the Standard C Library,
libc,
which is automatically loaded by the C compiler,
cc(1).
Declarations for some of these functions can be obtained from
#include
files indicated in the appropriate entries.
- (3G)
These functions constitute the graphics library
and are documented in separate manuals.
- (3I)
These functions constitute the instrument support
(Device I/O) library.
- (3M)
These functions constitute the Math Library,
libm.
The link editor searches this library if the
-lm
option is specified.
Declarations for these functions are available in the header files
<math.h>
and
<fenv.h>.
Several generally useful mathematical constants are also defined
in
<math.h>
(see
math(5)).
- (3N)
These functions are applicable to the Internet network
and are part of the standard C library,
libc.
- (3S)
These functions constitute the
``standard I/O package''
(see
stdio(3S)).
These functions are in the library
libc,
already mentioned.
Declarations for these functions can be obtained from the
#include
file
<stdio.h>.
- (3T)
These functions constitute the Pthreads Library.
The link editor
ld
(see
ld(1))
searches this library if the
-lpthread
option is specified. See
pthread(3T)
for more detailed information on threads.
- (3X)
Various specialized libraries.
The files in which these libraries are found are specified
in the appropriate entries.
DIAGNOSTICS
Functions in the C and Math Libraries, (3C) and (3M), may return
the conventional values
0
or
±HUGE_VAL
when the function is undefined for the given arguments
or when the value is not representable.
HUGE_VAL
is defined as +INFINITY in the
<math.h>
header file.
Functions in the Math Library may also return
±INFINITY or a NaN.
In these cases, the external variable
errno
(see
errno(2))
may also be set to the value [EDOM] or [ERANGE].
FILES
- /usr/lib/libc.a
Standard I/O,
operating system calls, and general purpose routines archive library.
- /usr/lib/libc.sl
Standard I/O,
operating system calls, and general purpose routines shared library.
- /usr/lib/libcurses.sl
CRT screen handling shared library.
- /usr/lib/libm.a
SVID3, XPG4.2, and ANSI C
compliant math archive library.
- /usr/lib/libm.sl
SVID3, XPG4.2, and ANSI C
compliant math shared library.
