Module posix.sys.wait

Wait for Process Termination.

Functions

wait ([pid=-1[, options]]) Wait for child process to terminate.

Constants

posix.sys.wait Wait constants.


Functions

wait ([pid=-1[, options]])
Wait for child process to terminate.

Parameters:

  • pid int child process id to wait for, or -1 for any child process (default -1)
  • options int bitwise OR of WNOHANG and WUNTRACED (optional)

Returns:

  1. int pid of terminated child, if successful
  2. string "exited", "killed" or "stopped"
  3. int exit status, or signal number responsible for "killed" or "stopped"

Or

  1. nil
  2. string error message
  3. int errnum

See also:

Constants

posix.sys.wait
Wait constants. Any constants not available in the underlying system will be nil valued.

Fields:

  • WNOHANG int don't block waiting
  • WUNTRACED int report status of stopped children

Usage:

      -- Print wait constants supported on this host.
      for name, value in pairs (require "posix.sys.wait") do
        if type (value) == "number" then
          print (name, value)
         end
      end
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