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process.rb
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process.rb
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module Process
module Constants
EXIT_SUCCESS = Rubinius::Config['rbx.platform.process.EXIT_SUCCESS'] || 0
EXIT_FAILURE = Rubinius::Config['rbx.platform.process.EXIT_FAILURE'] || 1
PRIO_PGRP = Rubinius::Config['rbx.platform.process.PRIO_PGRP']
PRIO_PROCESS = Rubinius::Config['rbx.platform.process.PRIO_PROCESS']
PRIO_USER = Rubinius::Config['rbx.platform.process.PRIO_USER']
RLIM_INFINITY = Rubinius::Config['rbx.platform.process.RLIM_INFINITY']
RLIM_SAVED_MAX = Rubinius::Config['rbx.platform.process.RLIM_SAVED_MAX']
RLIM_SAVED_CUR = Rubinius::Config['rbx.platform.process.RLIM_SAVED_CUR']
RLIMIT_AS = Rubinius::Config['rbx.platform.process.RLIMIT_AS']
RLIMIT_CORE = Rubinius::Config['rbx.platform.process.RLIMIT_CORE']
RLIMIT_CPU = Rubinius::Config['rbx.platform.process.RLIMIT_CPU']
RLIMIT_DATA = Rubinius::Config['rbx.platform.process.RLIMIT_DATA']
RLIMIT_FSIZE = Rubinius::Config['rbx.platform.process.RLIMIT_FSIZE']
RLIMIT_MEMLOCK = Rubinius::Config['rbx.platform.process.RLIMIT_MEMLOCK']
RLIMIT_NOFILE = Rubinius::Config['rbx.platform.process.RLIMIT_NOFILE']
RLIMIT_NPROC = Rubinius::Config['rbx.platform.process.RLIMIT_NPROC']
RLIMIT_RSS = Rubinius::Config['rbx.platform.process.RLIMIT_RSS']
RLIMIT_SBSIZE = Rubinius::Config['rbx.platform.process.RLIMIT_SBSIZE']
RLIMIT_STACK = Rubinius::Config['rbx.platform.process.RLIMIT_STACK']
WNOHANG = 1
WUNTRACED = 2
end
include Constants
class Rlimit < FFI::Struct
config "rbx.platform.rlimit", :rlim_cur, :rlim_max
end
def self.setrlimit(resource, cur_limit, max_limit=undefined)
rlimit = Rlimit.new
rlimit[:rlim_cur] = cur_limit
rlimit[:rlim_max] = max_limit.equal?(undefined) ? cur_limit : max_limit
Errno.handle if -1 == FFI::Platform::POSIX.setrlimit(resource, rlimit.pointer)
nil
end
def self.getrlimit(resource)
lim_max = []
rlimit = Rlimit.new
Errno.handle if -1 == FFI::Platform::POSIX.getrlimit(resource, rlimit.pointer)
lim_max = [rlimit[:rlim_cur], rlimit[:rlim_max]]
lim_max
end
def self.setsid
pgid = FFI::Platform::POSIX.setsid
Errno.handle if -1 == pgid
pgid
end
def self.fork
pid = perform_fork
pid = nil if pid == 0
if block_given? and pid.nil?
yield nil
Kernel.exit
end
pid
end
def self.times
now = Time.now
Struct::Tms.new(now - $STARTUP_TIME, 0.0, 0.0, 0.0)
end
def self.kill(sig, pid)
use_process_group = false
if sig.kind_of?(String)
if sig[0] == 45
sig = sig[1..-1]
use_process_group = true
end
if sig[0..2] == "SIG"
sig = sig[3..-1]
end
number = Signal::Names[sig]
else
number = sig.to_i
if number < 0
number = -number
use_process_group = true
end
end
pid = -pid if use_process_group
raise ArgumentError unless number
ret = FFI::Platform::POSIX.kill(pid, number)
case ret
when 0
return 1
when -1
Errno.handle
end
end
def self.abort(msg=nil)
$stderr.puts(msg) if(msg)
exit 1
end
def self.getpgid(pid)
ret = FFI::Platform::POSIX.getpgid(pid)
Errno.handle if ret == -1
ret
end
def self.setpgid(pid, int)
ret = FFI::Platform::POSIX.setpgid(pid, int)
Errno.handle if ret == -1
ret
end
@maxgroups = 32
class << self
attr_reader :maxgroups
def maxgroups=(m)
@maxgroups = m
end
end
def self.setpgrp
setpgid(0, 0)
end
def self.getpgrp
ret = FFI::Platform::POSIX.getpgrp
Errno.handle if ret == -1
ret
end
def self.pid
ret = FFI::Platform::POSIX.getpid
Errno.handle if ret == -1
ret
end
def self.ppid
ret = FFI::Platform::POSIX.getppid
Errno.handle if ret == -1
ret
end
def self.uid=(uid)
Process::Sys.setuid uid
end
def self.gid=(gid)
Process::Sys.setgid gid
end
def self.euid=(uid)
Process::Sys.seteuid uid
end
def self.egid=(gid)
Process::Sys.setegid gid
end
def self.uid
ret = FFI::Platform::POSIX.getuid
Errno.handle if ret == -1
ret
end
def self.gid
ret = FFI::Platform::POSIX.getgid
Errno.handle if ret == -1
ret
end
def self.euid
ret = FFI::Platform::POSIX.geteuid
Errno.handle if ret == -1
ret
end
def self.egid
ret = FFI::Platform::POSIX.getegid
Errno.handle if ret == -1
ret
end
def self.getpriority(kind, id)
FFI::Platform::POSIX.errno = 0
ret = FFI::Platform::POSIX.getpriority(kind, id)
Errno.handle
ret
end
def self.setpriority(kind, id, priority)
ret = FFI::Platform::POSIX.setpriority(kind, id, priority)
Errno.handle if ret == -1
ret
end
def self.groups
g = []
FFI::MemoryPointer.new(:int, @maxgroups) { |p|
num_groups = FFI::Platform::POSIX.getgroups(@maxgroups, p)
Errno.handle if num_groups == -1
g = p.read_array_of_int(num_groups)
}
g
end
def self.groups=(g)
@maxgroups = g.length if g.length > @maxgroups
FFI::MemoryPointer.new(:int, @maxgroups) { |p|
p.write_array_of_int(g)
Errno.handle if -1 == FFI::Platform::POSIX.setgroups(g.length, p)
}
g
end
def self.initgroups(username, gid)
Errno.handle if -1 == FFI::Platform::POSIX.initgroups(username, gid)
Process.groups
end
#
# Wait for the given process to exit.
#
# The pid may be the specific pid of some previously forked
# process, or -1 to indicate to watch for *any* child process
# exiting. Other options, such as process groups, may be available
# depending on the system.
#
# With no arguments the default is to block waiting for any
# child processes (pid -1.)
#
# The flag may be Process::WNOHANG, which indicates that
# the child should only be quickly checked. If it has not
# exited yet, nil is returned immediately instead.
#
# The return value is the exited pid or nil if Process::WNOHANG
# was used and the child had not yet exited.
#
# If the pid has exited, the global $? is set to a Process::Status
# object representing the exit status (and possibly other info) of
# the child.
#
# If there exists no such pid (e.g. never forked or already
# waited for), or no children at all, Errno::ECHILD is raised.
#
# TODO: Support other options such as WUNTRACED? --rue
#
def self.wait2(input_pid=-1, flags=nil)
if flags and (flags & WNOHANG) == WNOHANG
value = wait_pid_prim input_pid, true
return if value.nil?
else
value = wait_pid_prim input_pid, false
end
if value == false
raise Errno::ECHILD, "No child process: #{input_pid}"
end
# wait_pid_prim returns a tuple when wait needs to communicate
# the pid that was actually detected as stopped (since wait
# can wait for all child pids, groups, etc)
if value.kind_of? Rubinius::Tuple
status, pid = value
else
status = value
pid = input_pid
end
status = Process::Status.new(pid, status)
$? = status
[pid, status]
end
#
# Wait for all child processes.
#
# Blocks until all child processes have exited, and returns
# an Array of [pid, Process::Status] results, one for each
# child.
#
# Be mindful of the effects of creating new processes while
# .waitall has been called (usually in a different thread.)
# The .waitall call does not in any way check that it is only
# waiting for children that existed at the time it was called.
#
def self.waitall
statuses = []
begin
while true
statuses << Process.wait2
end
rescue Errno::ECHILD
end
statuses
end
def self.wait(pid=-1, flags=nil)
pid, status = Process.wait2(pid, flags)
return pid
end
class << self
alias_method :waitpid, :wait
alias_method :waitpid2, :wait2
end
#
# Indicate disinterest in child process.
#
# Sets up an internal wait on the given process ID.
# Only possibly real pids, i.e. positive numbers,
# may be waited for.
#
# TODO: Should an error be raised on ECHILD? --rue
#
# TODO: This operates on the assumption that waiting on
# the event consumes very little resources. If this
# is not the case, the check should be made WNOHANG
# and called periodically.
#
def self.detach(pid)
raise ArgumentError, "Only positive pids may be detached" unless pid > 0
# The evented system does not need a loop
Thread.new { Process.wait pid }
end
#--
# TODO: Most of the fields aren't implemented yet.
# TODO: Also, these objects should only need to be constructed by
# Process.wait and family.
#++
class Status
def initialize(pid, status)
@pid = pid
@status = status
end
def to_i
@status
end
def to_s
@status.to_s
end
def &(num)
@status & num
end
def ==(other)
other = other.to_i if other.kind_of? Process::Status
@status == other
end
def >>(num)
@status >> num
end
def coredump?
false
end
def exited?
true
end
def exitstatus
@status
end
def pid
@pid
end
def signaled?
false
end
def stopped?
false
end
def stopsig
nil
end
def success?
@status == 0
end
def termsig
nil
end
end
module Sys
class << self
def getegid
ret = FFI::Platform::POSIX.getegid
Errno.handle if ret == -1
ret
end
def geteuid
ret = FFI::Platform::POSIX.geteuid
Errno.handle if ret == -1
ret
end
def getgid
ret = FFI::Platform::POSIX.getgid
Errno.handle if ret == -1
ret
end
def getuid
ret = FFI::Platform::POSIX.getuid
Errno.handle if ret == -1
ret
end
def issetugid
raise "not implemented"
end
def setgid(gid)
FFI::Platform::POSIX.setgid gid
Errno.handle if ret == -1
nil
end
def setuid(uid)
FFI::Platform::POSIX.setuid uid
Errno.handle if ret == -1
nil
end
def setegid(egid)
ret = FFI::Platform::POSIX.setegid egid
Errno.handle if ret == -1
nil
end
def seteuid(euid)
FFI::Platform::POSIX.seteuid euid
Errno.handle if ret == -1
nil
end
def setrgid(rgid)
setregid(rgid, -1)
end
def setruid(ruid)
setreuid(ruid, -1)
end
def setregid(rid, eid)
FFI::Platform::POSIX.setregid rid, eid
Errno.handle if ret == -1
nil
end
def setreuid(rid)
FFI::Platform::POSIX.setreuid rid
Errno.handle if ret == -1
nil
end
def setresgid(rid, eid, sid)
FFI::Platform::POSIX.setresgid rid, eid, sid
Errno.handle if ret == -1
nil
end
def setresuid(rid, eig, sid)
FFI::Platform::POSIX.setresuid rid, eid, sid
Errno.handle if ret == -1
nil
end
end
end
module UID
class << self
def change_privilege(uid)
FFI::Platform::POSIX.setreuid(uid, uid)
uid
end
def eid
ret = FFI::Platform::POSIX.geteuid
Errno.handle if ret == -1
ret
end
def eid=(uid)
ret = FFI::Platform::POSIX.seteuid(uid)
Errno.handle if ret == -1
uid
end
alias_method :grant_privilege, :eid=
def re_exchange
real = FFI::Platform::POSIX.getuid
Errno.handle if real == -1
eff = FFI::Platform::POSIX.geteuid
Errno.handle if eff == -1
ret = FFI::Platform::POSIX.setreuid(eff, real)
Errno.handle if ret == -1
eff
end
def re_exchangeable?
true
end
def rid
ret = FFI::Platform::POSIX.getuid
Errno.handle if ret == -1
ret
end
def sid_available?
true
end
def switch
eff = re_exchange
if block_given?
ret = yield
re_exchange
return ret
else
return eff
end
end
end
end
module GID
class << self
def change_privilege(gid)
ret = FFI::Platform::POSIX.setregid(gid, gid)
Errno.handle if ret == -1
gid
end
def eid
ret = FFI::Platform::POSIX.getegid
Errno.handle if ret == -1
ret
end
def eid=(gid)
ret = FFI::Platform::POSIX.setegid(gid)
Errno.handle if ret == -1
gid
end
alias_method :grant_privilege, :eid=
def re_exchange
real = FFI::Platform::POSIX.getgid
Errno.handle if real == -1
eff = FFI::Platform::POSIX.getegid
Errno.handle if eff == -1
ret = FFI::Platform::POSIX.setregid(eff, real)
Errno.handle if ret == -1
eff
end
def re_exchangeable?
true
end
def rid
ret = FFI::Platform::POSIX.getgid
Errno.handle if ret == -1
ret
end
def sid_available?
true
end
def switch
eff = re_exchange
if block_given?
ret = yield
re_exchange
return ret
else
return eff
end
end
end
end
end
module Kernel
def fork(&block)
Process.fork(&block)
end
module_function :fork
def system(prog, *args)
pid = Process.fork
if pid
Process.waitpid(pid)
$?.exitstatus == 0
else
exec(prog, *args) rescue exit! 1
end
end
module_function :system
def exec(cmd, *args)
if args.empty? and cmd.kind_of? String
raise Errno::ENOENT if cmd.empty?
if /([*?{}\[\]<>()~&|$;'`"\n\s]|[^\w])/o.match(cmd)
Process.perform_exec "/bin/sh", ["sh", "-c", cmd]
else
Process.perform_exec cmd, [cmd]
end
else
if cmd.kind_of? Array
prog = cmd[0]
name = cmd[1]
else
name = prog = cmd
end
argv = [name]
args.each do |arg|
argv << arg.to_s
end
Process.perform_exec prog, argv
end
end
module_function :exec
def `(str) #`
str = StringValue(str)
read, write = IO.pipe
pid = Process.fork
if pid
write.close
output = ""
until read.eof?
output << read.read
end
Process.waitpid(pid)
read.close
return output
else
read.close
STDOUT.reopen write
Process.perform_exec "/bin/sh", ["sh", "-c", str]
end
end
module_function :` # `
end