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INTRO(3)		 BSD Library Functions Manual		      INTRO(3)

NAME
     intro — introduction to the C libraries

DESCRIPTION
     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).)

     libcompat (-lcompat)
		 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.

     libkvm (-lkvm)
		 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).)

     libmp (-lmp)

     libtermcap (-ltermcap)
		 The terminal independent operation library package.  (See
		 termcap(3).)

     liby (-ly)	 The library for yacc(1).

FILES
     /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 ALSO
     cc(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
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