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INTRO(3)		    BSD Programmer's 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 op-
     tion of the compiler.

     A subset of the libc(functions) are available from Fortran; they are de-
     scribed separately in intro(3f).

     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 curses(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.

     libl(-ll)	 The library for lex(1).

     libm(-lm)	 The math library, libm. The math library is loaded as needed
		 by the Pascal compiler pc(1),	but not by the C compiler
		 which requires the -lm flag.  (See math(3).)

     libmp(-lmp)

     libplot(-lplot)
		 Device independent plotting functions.	 (See plot(3).)

     libplotf77(-lplotf77)
		 The device independent plotting functions for Fortran.	 (See
		 plot(3).)

     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/libm.a	the math library

     /usr/lib/libc_p.a	the C library compiled for profiling
     /usr/lib/libm_p.a	the math library compiled for profiling

SEE ALSO
     stdio(3),	math(3),  intro(1),  intro(2),	intro(4),  intro(6),
     intro(7),	intro(8),  cc(1),  ld(1),  nm(1)

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

4th Berkeley Distribution	April 28, 1995				     2
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