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RocketLink!--> Man page versions: OpenBSD FreeBSD NetBSD Solaris Others

VFORK(2)                  OpenBSD Programmer's Manual                 VFORK(2)

     vfork - spawn new process and block parent

     #include <unistd.h>


     vfork() was originally used to create new processes without fully copying
     the address space of the old process, which is horrendously inefficient
     in a paged environment.  It was useful when the purpose of fork(2) would
     have been to create a new system context for an execve(2).  Since fork(2)
     is now efficient, even in the above case, the need for vfork() has dimin-
     ished.  vfork() differs from fork(2) in that the parent is suspended un-
     til the child makes a call to execve(2) or an exit (either by a call to
     _exit(2) or abnormally).

     vfork() returns 0 in the child's context and (later) the PID of the child
     in the parent's context.

     Same as for fork(2).

     execve(2),  fork(2),  sigaction(2),  wait(2)

     The vfork() function call appeared in 2.9BSD.

     To avoid a possible deadlock situation, processes that are children in
     the middle of a vfork() are never sent SIGTTOU or SIGTTIN signals;
     rather, output or ioctl(2) calls are allowed and input attempts result in
     an end-of-file indication.

OpenBSD 2.6                      June 30, 1997                               1

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]

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Up to: Process Signals and Events - Sending and handling signals and events.

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