vfork man page on Ultrix

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vfork(2)							      vfork(2)

Name
       vfork - spawn new process in a virtual memory-efficient way

Syntax
       pid = vfork()
       int pid;

Description
       The  can	 be  used  to  create  new processes without fully copying the
       address space of the old process, which is inefficient in a paged envi‐
       ronment.	  It is useful when the purpose of would have been to create a
       new system context for an The system call  differs  from	 in  that  the
       child borrows the parent's memory and thread of control until a call to
       or an exit (either by a call to or abnormally.)	The parent process  is
       suspended while the child is using its resources.

       The system call returns a value of zero (0) in the child's context and,
       later, the pid of the child in the parent's context.

       The system call can normally be used just like It does not  work,  how‐
       ever,  to return while running in the childs context from the procedure
       which called because the eventual return from would then	 return	 to  a
       nonexistent  stack  frame.  Be careful, also, to call _exit rather than
       exit if you cannot call because exit will flush and close standard  I/O
       channels	 and  thereby  cause problems in the parent process's standard
       I/O data structures.  Even with it  is  wrong  to  call	exit,  because
       buffered data would then be flushed twice.

Restrictions
       To avoid a possible deadlock situation, processes which are children in
       the middle of a are never sent SIGTTOU  or  SIGTTIN  signals.   Rather,
       output  or  ioctls are allowed, and input attempts result in an end-of-
       file indication.

Diagnostics
       Same as for

See Also
       execve(2), fork(2), sigvec(2), wait(2)

								      vfork(2)
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