NAME
	  fork,	vfork -	Creates	a new process

     SYNOPSIS
	  #include <sys/types.h>

	  pid_t	fork ( void );

	  pid_t	vfork (	void );

     DESCRIPTION
	  The fork() and vfork() functions create a new	process	(child
	  process) that	is identical to	the calling process (parent
	  process).

	  The child process inherits the following attributes from the
	  parent process:

	  o    Environment

	  o    Close-on-exec flags

	  o    Signal handling settings

	  o    Set user	ID mode	bit

	  o    Set group ID mode bit

	  o    Trusted state

	  o    Profiling on/off	status

	  o    Nice value

	  o    All attached shared libraries

	  o    Process group ID

	  o    tty group ID

	  o    Current directory

	  o    Root directory

	  o    File mode creation mask

	  o    File size limit

	  o    Attached	shared memory segments

	  o    Attached	mapped file segments

	  o    All mapped regions with the same	protection and sharing
	       mode as in the parent process

	  o    Its own copy of the parent's open directory streams

	  The child process differs from the parent process in the
	  following ways:

	  o    The child process has a unique process ID and does not
	       match any active	process	group ID.

	  o    The parent process ID of	the child process matches the
	       process ID of the parent.

	  o    The child process has its own copy of the parent
	       process's file descriptors.  However, each of the
	       child's file descriptors	shares a common	file pointer
	       with the	corresponding file descriptor of the parent
	       process.

	  o    All semadj values are cleared.

	  o    Process locks, text locks, and data locks are not
	       inherited by the	child process.

	  o    The child process's utime(), stime(), cutime(), and
	       cstime()	are set	to 0 (zero).

	  o    Any pending alarms are cleared in the child process.

	  o    Any interval timers enabled by the parent process are
	       disabled	in the child process.

	  o    Any signals pending for the parent process are disabled
	       for the child process.

	  If a multithreaded process calls the fork() function,	the
	  new process contains a replica of the	calling	thread and its
	  entire address space,	possibly including the states of
	  mutexes and other resources.	Consequently, to avoid errors,
	  the child process may	only execute operations	it knows will
	  not cause deadlock until such	time as	one of the exec	func-
	  tions	is called.

     NOTES
	  The fork() function is supported for multi-threaded applica-
	  tions.

	  The vfork() function is supported as a compatibility inter-
	  face for older BSD system programs, and can be used by com-
	  piling with Berkeley Compatibility Library (libbsd.a). The
	  memory sharing semantics of the vfork() function are
	  synonymous with the fork() function.

	  AES Support Level: Full use (fork())

     RETURN VALUES
	  Upon successful completion, the fork() function returns a
	  value	of 0 (zero) to the child process and returns the pro-
	  cess ID of the child process to the parent process.  If the
	  fork() function fails, a value of -1 is returned to the
	  parent process, no child process is created, and errno is
	  set to indicate the error.

     ERRORS
	  If the fork()	function fails,	errno may be set to one	of the
	  following values:

	  [EAGAIN]  The	system-imposed limit on	the total number of
		    processes executing	for a single user would	be
		    exceeded.  This limit can be exceeded by a process
		    with superuser privilege.

	  [ENOMEM]  There is not enough	space left for this process.

     RELATED INFORMATION
	  Functions: exec(2), exit(2), getpriority(2), getrusage(2),
	  nice(3), plock(2), ptrace(2),	raise(3), semop(2), shmat(2),
	  sigaction(2),	sigvec(2), times(3), ulimit(3),	umask(2),
	  wait(2)