4.4BSD/usr/share/man/cat3f/fork.0

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FORK(3F)               BSD Reference Manual              FORK(3F)

mer's Manual
NNAAMMEE
       fork - create a copy of this process

SSYYNNOOPPSSIISS
       iinntteeggeerr ffuunnccttiioonn ffoorrkk(())

DDEESSCCRRIIPPTTIIOONN
       _F_o_r_k creates a copy of the calling process.  The only dis-
       tinction  between  the  2  processes  is  that  the  value
       returned to one of them (referred to as the `parent'  pro-
       cess)  will  be  the  process id of the copy.  The copy is
       usually referred to as the  `child'  process.   The  value
       returned to the `child' process will be zero.

       All  logical units open for writing are flushed before the
       fork to avoid duplication of the contents of  I/O  buffers
       in the external file(s).

       If  the  returned value is negative, it indicates an error
       and will be the negation of the system  error  code.   See
       perror(3F).

       A corresponding _e_x_e_c routine has not been provided because
       there is no satisfactory way to retain open logical  units
       across the exec.  However, the usual function of _f_o_r_k_/_e_x_e_c
       can be performed using _s_y_s_t_e_m(3F).

FFIILLEESS
       /usr/lib/libU77.a

SSEEEE AALLSSOO
       fork(2), wait(3F), kill(3F), system(3F), perror(3F)





















4.2 Berkeley Distribution  June 5, 1993                         1