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

NAME
       intro - introduction to library functions

SYNOPSIS
       #include <stdio.h>

       #include <math.h>

DESCRIPTION
       This section describes functions that may be found in various
       libraries, other than those functions that directly invoke UNIX system
       primitives, which are described in section 2.  Functions are divided
       into various libraries distinguished by the section number at the top
       of the page:

       (3)   These functions, together with those of section 2 and those
             marked (3S), constitute library libc, which is automatically
             loaded by the C compiler cc(1) and the Fortran compiler f77(1).
             The link editor ld(1) searches this library under the `-lc'
             option.  Declarations for some of these functions may be obtained
             from include files indicated on the appropriate pages.

       (3M)  These functions constitute the math library, libm.  They are
             automatically loaded as needed by the Fortran compiler f77(1).
             The link editor searches this library under the `-lm' option.
             Declarations for these functions may be obtained from the include
             file <math.h>.

       (3S)  These functions constitute the `standard I/O package', see
             stdio(3).  These functions are in the library libc already
             mentioned.  Declarations for these functions may be obtained from
             the include file <stdio.h>.

       (3X)  Various specialized libraries have not been given distinctive
             captions.  The files in which these libraries are found are named
             on the appropriate pages.

FILES
       /lib/libc.a
       /lib/libm.a, /usr/lib/libm.a (one or the other)

SEE ALSO
       stdio(3), nm(1), ld(1), cc(1), f77(1), intro(2)

DIAGNOSTICS
       Functions in the math library (3M) may return conventional values when
       the function is undefined for the given arguments or when the value is
       not representable.  In these cases the external variable errno (see
       intro(2)) is set to the value EDOM or ERANGE.  The values of EDOM and
       ERANGE are defined in the include file _math.h_.

ASSEMBLER
       In assembly language these functions may be accessed by simulating the
       C calling sequence.  For example, ecvt(3) might be called this way:

              setd
              mov  $sign,-(sp)
              mov  $decpt,-(sp)
              mov  ndigit,-(sp)
              movf value,-(sp)
              jsr  pc,_ecvt
              add  $14.,sp

                                                                      INTRO(3)

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | DIAGNOSTICS | ASSEMBLER

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