Adds the wait3, wait4, waitid, pause, sigsend, and getrusage methods to the Process module.
gem install proc-wait3
require 'proc/wait3'
pid = fork{
sleep 1
exit 2
}
puts Time.now.to_s
Process.wait3
puts $?.exitstatus # => 2- Solaris
- Linux
- FreeBSD
- OS X
Linux users who compile with gcc -Wall will notice a few warnings. These are harmless (and unavoidable atm).
Linux users may also notice warnings about implicit declarations. These are also harmless, and can be silenced by installing the libbsd-dev package first.
On Darwin these methods will likely fail with Errno::EINTR unless you pass the WNOHANG flag. I am not sure why, I can only speculate that the child is receiving a signal from either the Ruby interpreter or the operating system.
I considered simply providing a patch to the core process.c file, but I decided against it for two reasons. First, I wanted to get something out more quickly rather than waiting for approval from the core developers who, based on an earlier post, seem somewhat gun-shy about integrating support for wait3() and wait4() based, I think, on portability concerns.
Second, and more importantly, I don't like the cProcStatus class. The extra inspection code seems like an awful lot of work for very little gain. The overloaded methods are also overkill, and do nothing but save me the trouble of typing the word "status", since all they're for is comparing or operating on the status attribute.
Please see the doc/wait3.txt file for detailed documentation.