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[DOC] RDoc for Process (#8179)
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Burdette Lamar
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195
process.c
195
process.c
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@ -520,10 +520,10 @@ clear_pid_cache(void)
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* call-seq:
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* Process.pid -> integer
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*
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* Returns the process id of this process. Not available on all
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* platforms.
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* Returns the process ID of the current process:
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*
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* Process.pid # => 15668
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*
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* Process.pid #=> 27415
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*/
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static VALUE
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@ -542,16 +542,17 @@ get_ppid(void)
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* call-seq:
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* Process.ppid -> integer
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*
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* Returns the process id of the parent of this process. Returns
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* untrustworthy value on Win32/64. Not available on all platforms.
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* Returns the process ID of the parent of the current process:
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*
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* puts "I am #{Process.pid}"
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* Process.fork { puts "Dad is #{Process.ppid}" }
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* puts "Pid is #{Process.pid}."
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* fork { puts "Parent pid is #{Process.ppid}." }
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*
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* <em>produces:</em>
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* Output:
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*
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* I am 27417
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* Dad is 27417
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* Pid is 271290.
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* Parent pid is 271290.
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*
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* May not return a trustworthy value on certain platforms.
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*/
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static VALUE
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@ -626,16 +627,23 @@ rb_last_status_get(void)
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* call-seq:
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* Process.last_status -> Process::Status or nil
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*
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* Returns the status of the last executed child process in the
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* current thread.
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* Returns a Process::Status object representing the most recently exited
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* child process in the current thread, or +nil+ if none:
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*
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* Process.wait Process.spawn("ruby", "-e", "exit 13")
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* Process.last_status #=> #<Process::Status: pid 4825 exit 13>
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* Process.spawn('ruby', '-e', 'exit 13')
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* Process.wait
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* Process.last_status # => #<Process::Status: pid 14396 exit 13>
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*
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* If no child process has ever been executed in the current
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* thread, this returns +nil+.
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* Process.spawn('ruby', '-e', 'exit 14')
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* Process.wait
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* Process.last_status # => #<Process::Status: pid 4692 exit 14>
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*
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* Process.spawn('ruby', '-e', 'exit 15')
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* # 'exit 15' has not been reaped by #wait.
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* Process.last_status # => #<Process::Status: pid 4692 exit 14>
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* Process.wait
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* Process.last_status # => #<Process::Status: pid 1380 exit 15>
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*
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* Process.last_status #=> nil
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*/
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static VALUE
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proc_s_last_status(VALUE mod)
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@ -1274,48 +1282,137 @@ proc_wait(int argc, VALUE *argv)
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/*
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* call-seq:
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* Process.wait() -> integer
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* Process.wait(pid = -1, flags = 0) -> integer
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* Process.waitpid(pid=-1, flags=0) -> integer
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*
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* Waits for a child process to exit, returns its process id, and
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* sets <code>$?</code> to a Process::Status object
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* containing information on that process. Which child it waits on
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* depends on the value of _pid_:
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* Waits for a suitable child process to exit, returns its process ID,
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* and sets <tt>$?</tt> to a Process::Status object
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* containing information on that process.
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* Which child it waits for depends on the value of the given +pid+:
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*
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* > 0:: Waits for the child whose process ID equals _pid_.
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* - Positive integer: Waits for the child process whose process ID is +pid+:
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*
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* 0:: Waits for any child whose process group ID equals that of the
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* calling process.
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* pid0 = Process.spawn('ruby', '-e', 'exit 13') # => 230866
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* pid1 = Process.spawn('ruby', '-e', 'exit 14') # => 230891
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* Process.wait(pid0) # => 230866
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* $? # => #<Process::Status: pid 230866 exit 13>
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* Process.wait(pid1) # => 230891
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* $? # => #<Process::Status: pid 230891 exit 14>
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* Process.wait(pid0) # Raises Errno::ECHILD
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*
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* -1:: Waits for any child process (the default if no _pid_ is
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* given).
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* - <tt>0</tt>: Waits for any child process whose group ID
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* is the same as that of the current process:
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*
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* < -1:: Waits for any child whose process group ID equals the absolute
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* value of _pid_.
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* parent_pgpid = Process.getpgid(Process.pid)
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* puts "Parent process group ID is #{parent_pgpid}."
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* child0_pid = fork do
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* puts "Child 0 pid is #{Process.pid}"
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* child0_pgid = Process.getpgid(Process.pid)
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* puts "Child 0 process group ID is #{child0_pgid} (same as parent's)."
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* end
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* child1_pid = fork do
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* puts "Child 1 pid is #{Process.pid}"
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* Process.setpgid(0, Process.pid)
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* child1_pgid = Process.getpgid(Process.pid)
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* puts "Child 1 process group ID is #{child1_pgid} (different from parent's)."
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* end
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* retrieved_pid = Process.wait(0)
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* puts "Process.wait(0) returned pid #{retrieved_pid}, which is child 0 pid."
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* begin
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* Process.wait(0)
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* rescue Errno::ECHILD => x
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* puts "Raised #{x.class}, because child 1 process group ID differs from parent process group ID."
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* end
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*
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* The _flags_ argument may be a logical or of the flag values
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* Process::WNOHANG (do not block if no child available)
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* or Process::WUNTRACED (return stopped children that
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* haven't been reported). Not all flags are available on all
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* platforms, but a flag value of zero will work on all platforms.
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* Output:
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*
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* Calling this method raises a SystemCallError if there are no child
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* processes. Not available on all platforms.
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* Parent process group ID is 225764.
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* Child 0 pid is 225788
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* Child 0 process group ID is 225764 (same as parent's).
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* Child 1 pid is 225789
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* Child 1 process group ID is 225789 (different from parent's).
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* Process.wait(0) returned pid 225788, which is child 0 pid.
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* Raised Errno::ECHILD, because child 1 process group ID differs from parent process group ID.
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*
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* include Process
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* fork { exit 99 } #=> 27429
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* wait #=> 27429
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* $?.exitstatus #=> 99
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* - <tt>-1</tt> (default): Waits for any child process:
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*
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* pid = fork { sleep 3 } #=> 27440
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* Time.now #=> 2008-03-08 19:56:16 +0900
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* waitpid(pid, Process::WNOHANG) #=> nil
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* Time.now #=> 2008-03-08 19:56:16 +0900
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* waitpid(pid, 0) #=> 27440
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* Time.now #=> 2008-03-08 19:56:19 +0900
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* parent_pgpid = Process.getpgid(Process.pid)
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* puts "Parent process group ID is #{parent_pgpid}."
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* child0_pid = fork do
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* puts "Child 0 pid is #{Process.pid}"
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* child0_pgid = Process.getpgid(Process.pid)
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* puts "Child 0 process group ID is #{child0_pgid} (same as parent's)."
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* end
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* child1_pid = fork do
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* puts "Child 1 pid is #{Process.pid}"
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* Process.setpgid(0, Process.pid)
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* child1_pgid = Process.getpgid(Process.pid)
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* puts "Child 1 process group ID is #{child1_pgid} (different from parent's)."
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* sleep 3 # To force child 1 to exit later than child 0 exit.
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* end
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* child_pids = [child0_pid, child1_pid]
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* retrieved_pid = Process.wait(-1)
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* puts child_pids.include?(retrieved_pid)
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* retrieved_pid = Process.wait(-1)
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* puts child_pids.include?(retrieved_pid)
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*
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* Output:
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*
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* Parent process group ID is 228736.
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* Child 0 pid is 228758
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* Child 0 process group ID is 228736 (same as parent's).
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* Child 1 pid is 228759
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* Child 1 process group ID is 228759 (different from parent's).
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* true
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* true
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*
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* - Less than <tt>-1</tt>: Waits for any child whose process group ID is <tt>-pid</tt>:
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*
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* parent_pgpid = Process.getpgid(Process.pid)
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* puts "Parent process group ID is #{parent_pgpid}."
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* child0_pid = fork do
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* puts "Child 0 pid is #{Process.pid}"
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* child0_pgid = Process.getpgid(Process.pid)
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* puts "Child 0 process group ID is #{child0_pgid} (same as parent's)."
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* end
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* child1_pid = fork do
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* puts "Child 1 pid is #{Process.pid}"
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* Process.setpgid(0, Process.pid)
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* child1_pgid = Process.getpgid(Process.pid)
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* puts "Child 1 process group ID is #{child1_pgid} (different from parent's)."
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* end
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* sleep 1
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* retrieved_pid = Process.wait(-child1_pid)
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* puts "Process.wait(-child1_pid) returned pid #{retrieved_pid}, which is child 1 pid."
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* begin
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* Process.wait(-child1_pid)
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* rescue Errno::ECHILD => x
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* puts "Raised #{x.class}, because there's no longer a child with process group id #{child1_pid}."
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* end
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*
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* Output:
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*
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* Parent process group ID is 230083.
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* Child 0 pid is 230108
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* Child 0 process group ID is 230083 (same as parent's).
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* Child 1 pid is 230109
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* Child 1 process group ID is 230109 (different from parent's).
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* Process.wait(-child1_pid) returned pid 230109, which is child 1 pid.
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* Raised Errno::ECHILD, because there's no longer a child with process group id 230109.
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*
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* Argument +flags+ should be given as one of the following constants,
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* or as the logical OR of both:
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*
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* - Process::WNOHANG: Does not block if no child process is available.
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* - Process:WUNTRACED: May return a stopped child process, even if not yet reported.
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*
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* Not all flags are available on all platforms.
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*
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* Raises Errno::ECHILD if there is no suitable child process.
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*
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* Not available on all platforms.
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*
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* Process.waitpid is an alias for Process.wait.
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*/
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static VALUE
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proc_m_wait(int c, VALUE *v, VALUE _)
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{
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@ -1329,7 +1426,7 @@ proc_m_wait(int c, VALUE *v, VALUE _)
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* Process.waitpid2(pid=-1, flags=0) -> [pid, status]
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*
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* Waits for a child process to exit (see Process::waitpid for exact
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* semantics) and returns an array containing the process id and the
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* semantics) and returns an array containing the process ID and the
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* exit status (a Process::Status object) of that
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* child. Raises a SystemCallError if there are no child processes.
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*
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