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* lib/open3.rb: double fork is replaced by spawn with Process.detach.

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(Open3.popen3w): new method to access the thread returned by
  Process.detach.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16198 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2008-04-26 04:03:59 +00:00
parent 8e8095dd88
commit 61234dab9c
2 changed files with 54 additions and 29 deletions
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6
ChangeLog
View file

@ -1,3 +1,9 @@
Sat Apr 26 13:00:41 2008 Tanaka Akira <akr@fsij.org>
* lib/open3.rb: double fork is replaced by spawn with Process.detach.
(Open3.popen3w): new method to access the thread returned by
Process.detach.
Sat Apr 26 00:47:43 2008 Tanaka Akira <akr@fsij.org>
* process.c (rb_spawn_internal): new function to specify

77
lib/open3.rb
View file

@ -17,6 +17,8 @@
#
# stdin, stdout, stderr = popen3('nroff -man')
#
# If the exit status of the child process is required, Open3.popen3w is usable.
#
# Open3.popen3 can also take a block which will receive stdin, stdout and
# stderr as parameters. This ensures stdin, stdout and stderr are closed
# once the block exits. Example:
@ -29,62 +31,79 @@
module Open3
#
# Open stdin, stdout, and stderr streams and start external executable.
#
# Non-block form:
#
# require 'open3'
#
# [stdin, stdout, stderr] = Open3.popen3(cmd)
# stdin, stdout, stderr = Open3.popen3(cmd)
# ...
# stdin.close # stdin, stdout and stderr should be closed in this form.
# stdout.close
# stderr.close
#
# Block form:
#
# require 'open3'
#
# Open3.popen3(cmd) { |stdin, stdout, stderr| ... }
# # stdin, stdout and stderr is closed automatically in this form.
#
# The parameter +cmd+ is passed directly to Kernel#exec.
# The parameter +cmd+ is passed directly to Kernel#spawn.
#
def popen3(*cmd)
if defined? yield
popen3w(*cmd) {|stdin, stdout, stderr, wait_thr|
yield stdin, stdout, stderr
}
else
stdin, stdout, stderr, wait_thr = popen3w(*cmd)
return stdin, stdout, stderr
end
end
module_function :popen3
#
# Open stdin, stdout, and stderr streams and start external executable.
# In addition, a thread for waiting the started process is noticed.
#
# Non-block form:
#
# stdin, stdout, stderr, wait_thr = Open3.popen3w(cmd)
# ...
# stdin.close # stdin, stdout and stderr should be closed in this form.
# stdout.close
# stderr.close
# exit_status = wait_thr.value # Process::Status object returned.
#
# Block form:
#
# Open3.popen3w(cmd) { |stdin, stdout, stderr, wait_thr| ... }
#
# The parameter +cmd+ is passed directly to Kernel#spawn.
#
def popen3w(*cmd)
pw = IO::pipe # pipe[0] for read, pipe[1] for write
pr = IO::pipe
pe = IO::pipe
pid = fork{
# child
fork{
# grandchild
pw[1].close
STDIN.reopen(pw[0])
pw[0].close
pr[0].close
STDOUT.reopen(pr[1])
pr[1].close
pe[0].close
STDERR.reopen(pe[1])
pe[1].close
exec(*cmd)
}
exit!(0)
}
pid = spawn(*cmd, STDIN=>pw[0], STDOUT=>pr[1], STDERR=>pe[1])
wait_thr = Process.detach(pid)
wait_thr[:pid] = pid
pw[0].close
pr[1].close
pe[1].close
Process.waitpid(pid)
pi = [pw[1], pr[0], pe[0]]
pi = [pw[1], pr[0], pe[0], wait_thr]
pw[1].sync = true
if defined? yield
begin
return yield(*pi)
ensure
pi.each{|p| p.close unless p.closed?}
[pw[1], pr[0], pe[0]].each{|p| p.close unless p.closed?}
wait_thr.join
end
end
pi
end
module_function :popen3
module_function :popen3w
end
if $0 == __FILE__