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INTRO(3)	       FreeBSD Library Functions Manual		      INTRO(3)

     intro -- 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 op-
     tion 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 rou-
		 tines,	database routines, bit operators, string operators,
		 character tests and character operators, des encryption rou-
		 tines,	storage	allocation, time functions, signal handling
		 and more.

     libcurses (-lcurses -ltermcap)
		 Terminal independent screen management	routines for two di-
		 mensional 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 in-
		 cluded	for source code	compatibility.	Use of these routines
		 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 re-
		 quires	the -lm	flag.  (See math(3).)

     libmp (-lmp)

     libtermcap	(-ltermcap)
		 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

     cc(1), ld(1), nm(1), intro(2), math(3), stdio(3)

     An	intro manual appeared in Version 7 AT&T	UNIX.

FreeBSD	13.0			March 22, 2017			  FreeBSD 13.0


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