INTRO(3) BSD Library Functions Manual INTRO(3)NAMEintro — introduction to the C libraries
This section provides an overview of the C library functions, their error
returns and other common definitions and concepts. Most of these func‐
tions are available from the C library, libc. Other libraries, such as
the math library, libm, must be indicated at compile time with the -l
option of the compiler.
The various libraries (followed by the loader flag):
libc (-lc) Standard C library functions. When using the C compiler
cc(1), it is not necessary to supply the loader flag -lc for
these functions. There are several `libraries' or groups of
functions included inside of libc: the standard I/O routines,
database routines, bit operators, string operators, character
tests and character operators, des encryption routines, stor‐
age allocation, time functions, signal handling and more.
libcurses (-lcurses -ltermcap)
Terminal independent screen management routines for two
dimensional non-bitmap display terminals. (See ncurses(3).)
Functions which are obsolete but are available for compati‐
bility with 4.3BSD. In particular, a number of system call
interfaces provided in previous releases of BSD have been
included for source code compatibility. Use of these rou‐
tines should, for the most part, be avoided. The manual page
entry for each compatibility routine indicates the proper
interface to use.
Functions used to access kernel memory are in this library.
They can be used against both a running system and a crash
dump. (See kvm(3).)
libl (-ll) The library for lex(1).
libm (-lm) The math library, libm. The math library is loaded as needed
by the Pascal compiler, but not by the C compiler which
requires the -lm flag. (See math(3).)
The terminal independent operation library package. (See
liby (-ly) The library for yacc(1).
/usr/lib/libc.a the C library
/usr/lib/libc_p.a the C library compiled for profiling
/usr/lib/libm.a the math library
/usr/lib/libm_p.a the math library compiled for profiling
SEE ALSOcc(1), ld(1), nm(1), intro(2), math(3), stdio(3)HISTORY
An intro manual appeared in Version 7 AT&T UNIX.
BSD June 5, 1993 BSD