Pvfork(2)                 Oct. 1, 1991                  Pvfork(2)



NAME
     Pvfork - create a copy of the current process

SYNOPSIS
     WORD Pvfork();

DESCRIPTION
     Pvfork creates a copy of the current process. Both the child
     (the  new process created) and the parent (the process which
     first made the call) share the same address space, i.e.  any
     changes  that  the  child  makes  to  variables will also be
     noticed by the parent.  The  new  process  begins  execution
     with an apparent return from the Pvfork call.

     Because the two processes  share  the  same  address  space,
     including  the  same  stack, there could be many problems if
     they actually were running at the same time. Therefore,  the
     parent  process  is suspended until the child process either
     exits or uses mode 200 of Pexec to overlay itself with a new
     program in a new address space.

RETURNS
     0 in the child

     The new process id (a positive number), in the parent.

     ENSMEM if there is not enough memory to create the new  pro-
     cess.

SEE ALSO
     Pexec(2), Pfork(2)

BUGS
     If the parent is in supervisor mode when this call is  made,
     the  child  will be started in user mode anyway; thus, it is
     strongly recommended that this call be made only  from  user
     mode.


















Version 0.9   Last change: MiNT Programmer's Manual             1