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process.jl
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process.jl
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# This file is a part of Julia. License is MIT: http://julialang.org/license
abstract AbstractCmd
immutable Cmd <: AbstractCmd
exec::Vector{ByteString}
ignorestatus::Bool
detach::Bool
env::Union{Array{ByteString},Void}
dir::UTF8String
Cmd(exec::Vector{ByteString}) =
new(exec, false, false, nothing, "")
Cmd(cmd::Cmd, ignorestatus, detach, env, dir) =
new(cmd.exec, ignorestatus, detach, env,
dir === cmd.dir ? dir : cstr(dir))
Cmd(cmd::Cmd; ignorestatus=cmd.ignorestatus, detach=cmd.detach, env=cmd.env, dir=cmd.dir) =
new(cmd.exec, ignorestatus, detach, env,
dir === cmd.dir ? dir : cstr(dir))
end
immutable OrCmds <: AbstractCmd
a::AbstractCmd
b::AbstractCmd
OrCmds(a::AbstractCmd, b::AbstractCmd) = new(a, b)
end
immutable ErrOrCmds <: AbstractCmd
a::AbstractCmd
b::AbstractCmd
ErrOrCmds(a::AbstractCmd, b::AbstractCmd) = new(a, b)
end
immutable AndCmds <: AbstractCmd
a::AbstractCmd
b::AbstractCmd
AndCmds(a::AbstractCmd, b::AbstractCmd) = new(a, b)
end
shell_escape(cmd::Cmd) = shell_escape(cmd.exec...)
function show(io::IO, cmd::Cmd)
print_env = cmd.env !== nothing
print_dir = !isempty(cmd.dir)
(print_env || print_dir) && print(io, "setenv(")
esc = shell_escape(cmd)
print(io, '`')
for c in esc
if c == '`'
print(io, '\\')
end
print(io, c)
end
print(io, '`')
print_env && (print(io, ","); show(io, cmd.env))
print_dir && (print(io, "; dir="); show(io, cmd.dir))
(print_dir || print_env) && print(io, ")")
end
function show(io::IO, cmds::Union{OrCmds,ErrOrCmds})
print(io, "pipeline(")
show(io, cmds.a)
print(io, ", ")
print(io, isa(cmds, ErrOrCmds) ? "stderr=" : "stdout=")
show(io, cmds.b)
print(io, ")")
end
function show(io::IO, cmds::AndCmds)
show(io, cmds.a)
print(io, " & ")
show(io, cmds.b)
end
const STDIN_NO = 0
const STDOUT_NO = 1
const STDERR_NO = 2
immutable FileRedirect
filename::AbstractString
append::Bool
function FileRedirect(filename, append)
if lowercase(filename) == (@unix? "/dev/null" : "nul")
warn_once("for portability use DevNull instead of a file redirect")
end
new(filename, append)
end
end
immutable DevNullStream <: IO end
const DevNull = DevNullStream()
isreadable(::DevNullStream) = false
iswritable(::DevNullStream) = true
isopen(::DevNullStream) = true
read{T<:DevNullStream}(::T, args...) = throw(EOFErorr())
write{T<:DevNullStream}(::T, args...) = 0
close(::DevNullStream) = nothing
flush(::DevNullStream) = nothing
copy(::DevNullStream) = DevNull
wait_connected(::DevNullStream) = nothing
wait_readnb(::DevNullStream) = wait()
wait_readbyte(::DevNullStream) = wait()
wait_close(::DevNullStream) = wait()
eof(::DevNullStream) = true
uvhandle(::DevNullStream) = C_NULL
uvtype(::DevNullStream) = UV_STREAM
uvhandle(x::Ptr) = x
uvtype(::Ptr) = UV_STREAM
# Not actually a pointer, but that's how we pass it through the C API so it's fine
uvhandle(x::RawFD) = convert(Ptr{Void}, x.fd % UInt)
uvtype(x::RawFD) = UV_RAW_FD
typealias Redirectable Union{IO, FileRedirect, RawFD}
typealias StdIOSet NTuple{3, Union{Redirectable, Ptr{Void}}} # XXX: remove Ptr{Void} once libuv is refactored to use upstream release
immutable CmdRedirect <: AbstractCmd
cmd::AbstractCmd
handle::Redirectable
stream_no::Int
end
function show(io::IO, cr::CmdRedirect)
print(io, "pipeline(")
show(io, cr.cmd)
print(io, ", ")
if cr.stream_no == STDOUT_NO
print(io, "stdout=")
elseif cr.stream_no == STDERR_NO
print(io, "stderr=")
elseif cr.stream_no == STDIN_NO
print(io, "stdin=")
end
show(io, cr.handle)
print(io, ")")
end
ignorestatus(cmd::Cmd) = Cmd(cmd, ignorestatus=true)
ignorestatus(cmd::Union{OrCmds,AndCmds}) =
typeof(cmd)(ignorestatus(cmd.a), ignorestatus(cmd.b))
detach(cmd::Cmd) = Cmd(cmd, detach=true)
# like bytestring(s), but throw an error if s contains NUL, since
# libuv requires NUL-terminated strings
function cstr(s)
if Base.containsnul(s)
throw(ArgumentError("strings containing NUL cannot be passed to spawned processes"))
end
return bytestring(s)
end
function setenv{S<:ByteString}(cmd::Cmd, env::Array{S}; dir="")
byteenv = ByteString[cstr(x) for x in env]
return Cmd(cmd; env = byteenv, dir = dir)
end
function setenv(cmd::Cmd, env::Associative; dir="")
byteenv = ByteString[cstr(string(k)*"="*string(v)) for (k,v) in env]
return Cmd(cmd; env = byteenv, dir = dir)
end
function setenv{T<:AbstractString}(cmd::Cmd, env::Pair{T}...; dir="")
byteenv = ByteString[cstr(k*"="*string(v)) for (k,v) in env]
return Cmd(cmd; env = byteenv, dir = dir)
end
function setenv(cmd::Cmd; dir="")
return Cmd(cmd; dir = dir)
end
(&)(left::AbstractCmd, right::AbstractCmd) = AndCmds(left, right)
redir_out(src::AbstractCmd, dest::AbstractCmd) = OrCmds(src, dest)
redir_err(src::AbstractCmd, dest::AbstractCmd) = ErrOrCmds(src, dest)
# Stream Redirects
redir_out(dest::Redirectable, src::AbstractCmd) = CmdRedirect(src, dest, STDIN_NO)
redir_out(src::AbstractCmd, dest::Redirectable) = CmdRedirect(src, dest, STDOUT_NO)
redir_err(src::AbstractCmd, dest::Redirectable) = CmdRedirect(src, dest, STDERR_NO)
# File redirects
redir_out(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, false), STDOUT_NO)
redir_out(src::AbstractString, dest::AbstractCmd) = CmdRedirect(dest, FileRedirect(src, false), STDIN_NO)
redir_err(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, false), STDERR_NO)
redir_out_append(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, true), STDOUT_NO)
redir_err_append(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, true), STDERR_NO)
function pipeline(cmd::AbstractCmd; stdin=nothing, stdout=nothing, stderr=nothing, append::Bool=false)
if append && stdout === nothing && stderr === nothing
error("append set to true, but no output redirections specified")
end
if stdin !== nothing
cmd = redir_out(stdin, cmd)
end
if stdout !== nothing
cmd = append ? redir_out_append(cmd, stdout) : redir_out(cmd, stdout)
end
if stderr !== nothing
cmd = append ? redir_err_append(cmd, stderr) : redir_err(cmd, stderr)
end
return cmd
end
pipeline(cmd::AbstractCmd, dest) = pipeline(cmd, stdout=dest)
pipeline(src::Union{Redirectable,AbstractString}, cmd::AbstractCmd) = pipeline(cmd, stdin=src)
pipeline(a, b, c, d...) = pipeline(pipeline(a,b), c, d...)
type Process <: AbstractPipe
cmd::Cmd
handle::Ptr{Void}
in::IO
out::IO
err::IO
exitcode::Int64
termsignal::Int32
exitcb::Callback
exitnotify::Condition
closecb::Callback
closenotify::Condition
function Process(cmd::Cmd, handle::Ptr{Void},
in::Union{Redirectable, Ptr{Void}},
out::Union{Redirectable, Ptr{Void}},
err::Union{Redirectable, Ptr{Void}})
if !isa(in, IO)
in = DevNull
end
if !isa(out, IO)
out = DevNull
end
if !isa(err, IO)
err = DevNull
end
this = new(cmd, handle, in, out, err,
typemin(fieldtype(Process, :exitcode)),
typemin(fieldtype(Process, :termsignal)),
false, Condition(), false, Condition())
finalizer(this, uvfinalize)
this
end
end
immutable ProcessChain <: AbstractPipe
processes::Vector{Process}
in::Redirectable
out::Redirectable
err::Redirectable
ProcessChain(stdios::StdIOSet) = new(Process[], stdios[1], stdios[2], stdios[3])
end
function _jl_spawn(cmd, argv, loop::Ptr{Void}, pp::Process,
in, out, err)
proc = Libc.malloc(_sizeof_uv_process)
disassociate_julia_struct(proc)
error = ccall(:jl_spawn, Int32,
(Ptr{UInt8}, Ptr{Ptr{UInt8}}, Ptr{Void}, Ptr{Void}, Any, Int32,
Ptr{Void}, Int32, Ptr{Void}, Int32, Ptr{Void}, Int32, Ptr{Ptr{UInt8}}, Ptr{UInt8}, Ptr{Void}),
cmd, argv, loop, proc, pp, uvtype(in),
uvhandle(in), uvtype(out), uvhandle(out), uvtype(err), uvhandle(err),
pp.cmd.detach, pp.cmd.env === nothing ? C_NULL : pp.cmd.env, isempty(pp.cmd.dir) ? C_NULL : pp.cmd.dir,
uv_jl_return_spawn::Ptr{Void})
if error != 0
ccall(:jl_forceclose_uv, Void, (Ptr{Void},), proc)
throw(UVError("could not spawn "*string(pp.cmd), error))
end
associate_julia_struct(proc, pp)
return proc
end
function uvfinalize(proc::Process)
proc.handle != C_NULL && ccall(:jl_close_uv, Void, (Ptr{Void},), proc.handle)
disassociate_julia_struct(proc)
proc.handle = C_NULL
end
function uv_return_spawn(p::Ptr{Void}, exit_status::Int64, termsignal::Int32)
data = ccall(:jl_uv_process_data, Ptr{Void}, (Ptr{Void},), p)
data == C_NULL && return
proc = unsafe_pointer_to_objref(data)::Process
proc.exitcode = exit_status
proc.termsignal = termsignal
if isa(proc.exitcb, Function) proc.exitcb(proc, exit_status, termsignal) end
ccall(:jl_close_uv, Void, (Ptr{Void},), proc.handle)
notify(proc.exitnotify)
nothing
end
function _uv_hook_close(proc::Process)
proc.handle = C_NULL
if isa(proc.closecb, Function) proc.closecb(proc) end
notify(proc.closenotify)
end
function spawn(redirect::CmdRedirect, stdios::StdIOSet, exitcb::Callback, closecb::Callback; chain::Nullable{ProcessChain}=Nullable{ProcessChain}())
spawn(redirect.cmd,
(redirect.stream_no == STDIN_NO ? redirect.handle : stdios[1],
redirect.stream_no == STDOUT_NO ? redirect.handle : stdios[2],
redirect.stream_no == STDERR_NO ? redirect.handle : stdios[3]),
exitcb, closecb, chain=chain)
end
function spawn(cmds::OrCmds, stdios::StdIOSet, exitcb::Callback, closecb::Callback; chain::Nullable{ProcessChain}=Nullable{ProcessChain}())
out_pipe = Libc.malloc(_sizeof_uv_named_pipe)
in_pipe = Libc.malloc(_sizeof_uv_named_pipe)
link_pipe(in_pipe, false, out_pipe, false)
if isnull(chain)
chain = Nullable(ProcessChain(stdios))
end
try
spawn(cmds.a, (stdios[1], out_pipe, stdios[3]), exitcb, closecb, chain=chain)
spawn(cmds.b, (in_pipe, stdios[2], stdios[3]), exitcb, closecb, chain=chain)
finally
close_pipe_sync(out_pipe)
close_pipe_sync(in_pipe)
Libc.free(out_pipe)
Libc.free(in_pipe)
end
get(chain)
end
function spawn(cmds::ErrOrCmds, stdios::StdIOSet, exitcb::Callback, closecb::Callback; chain::Nullable{ProcessChain}=Nullable{ProcessChain}())
out_pipe = Libc.malloc(_sizeof_uv_named_pipe)
in_pipe = Libc.malloc(_sizeof_uv_named_pipe)
link_pipe(in_pipe, false, out_pipe, false)
if isnull(chain)
chain = Nullable(ProcessChain(stdios))
end
try
spawn(cmds.a, (stdios[1], stdios[2], out_pipe), exitcb, closecb, chain=chain)
spawn(cmds.b, (in_pipe, stdios[2], stdios[3]), exitcb, closecb, chain=chain)
finally
close_pipe_sync(out_pipe)
close_pipe_sync(in_pipe)
Libc.free(out_pipe)
Libc.free(in_pipe)
end
get(chain)
end
function setup_stdio(stdio::PipeEndpoint, readable::Bool)
closeafter = false
if stdio.handle == C_NULL
io = Libc.malloc(_sizeof_uv_named_pipe)
if readable
link_pipe(io, false, stdio, true)
else
link_pipe(stdio, true, io, false)
end
closeafter = true
else
io = stdio.handle
end
return (io, closeafter)
end
function setup_stdio(stdio::Pipe, readable::Bool)
if stdio.in.handle == C_NULL && stdio.out.handle == C_NULL
link_pipe(stdio)
end
io = readable ? stdio.out : stdio.in
return (io, false)
end
function setup_stdio(stdio::IOStream, readable::Bool)
io = FS.File(RawFD(fd(stdio)))
return (io, false)
end
function setup_stdio(stdio::FileRedirect, readable::Bool)
if readable
attr = JL_O_RDONLY
perm = zero(S_IRUSR)
else
attr = JL_O_WRONLY | JL_O_CREAT
attr |= stdio.append ? JL_O_APPEND : JL_O_TRUNC
perm = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
end
io = FS.open(stdio.filename, attr, perm)
return (io, true)
end
function setup_stdio(io, readable::Bool)
# if there is no specialization,
# assume that uvhandle and uvtype are defined for it
return io, false
end
function setup_stdio(stdio::Ptr{Void}, readable::Bool)
return (stdio, false)
end
function close_stdio(stdio::Ptr{Void})
close_pipe_sync(stdio)
Libc.free(stdio)
end
function close_stdio(stdio)
close(stdio)
end
function setup_stdio(anon::Function, stdio::StdIOSet)
in, close_in = setup_stdio(stdio[1], true)
out, close_out = setup_stdio(stdio[2], false)
err, close_err = setup_stdio(stdio[3], false)
anon(in, out, err)
close_in && close_stdio(in)
close_out && close_stdio(out)
close_err && close_stdio(err)
end
function spawn(cmd::Cmd, stdios::StdIOSet, exitcb::Callback, closecb::Callback; chain::Nullable{ProcessChain}=Nullable{ProcessChain}())
loop = eventloop()
pp = Process(cmd, C_NULL, stdios[1], stdios[2], stdios[3]);
pp.exitcb = exitcb
pp.closecb = closecb
setup_stdio(stdios) do in, out, err
pp.handle = _jl_spawn(cmd.exec[1], cmd.exec, loop, pp,
in, out, err)
end
if !isnull(chain)
push!(get(chain).processes, pp)
end
pp
end
function spawn(cmds::AndCmds, stdios::StdIOSet, exitcb::Callback, closecb::Callback; chain::Nullable{ProcessChain}=Nullable{ProcessChain}())
if isnull(chain)
chain = Nullable(ProcessChain(stdios))
end
setup_stdio(stdios) do in, out, err
spawn(cmds.a, (in,out,err), exitcb, closecb, chain=chain)
spawn(cmds.b, (in,out,err), exitcb, closecb, chain=chain)
end
get(chain)
end
# INTERNAL
# returns a tuple of function arguments to spawn:
# (stdios, exitcb, closecb)
# | | \ The function to be called once the uv handle is closed
# | \ The function to be called once the process exits
# \ A set of up to 256 stdio instructions, where each entry can be either:
# | - An IO to be passed to the child
# | - DevNull to pass /dev/null
# | - An FS.File object to redirect the output to
# \ - An ASCIIString specifying a filename to be opened
spawn_opts_swallow(stdios::StdIOSet, exitcb::Callback=false, closecb::Callback=false) =
(stdios,exitcb,closecb)
spawn_opts_swallow(in::Redirectable=DevNull, out::Redirectable=DevNull, err::Redirectable=DevNull, args...) =
(tuple(in,out,err,args...),false,false)
spawn_opts_inherit(stdios::StdIOSet, exitcb::Callback=false, closecb::Callback=false) =
(stdios,exitcb,closecb)
# pass original descriptors to child processes by default, because we might
# have already exhausted and closed the libuv object for our standard streams.
# this caused issue #8529.
spawn_opts_inherit(in::Redirectable=RawFD(0), out::Redirectable=RawFD(1), err::Redirectable=RawFD(2), args...) =
(tuple(in,out,err,args...),false,false)
spawn(cmds::AbstractCmd, args...; chain::Nullable{ProcessChain}=Nullable{ProcessChain}()) =
spawn(cmds, spawn_opts_swallow(args...)...; chain=chain)
spawn(cmds::AbstractCmd, args...; chain::Nullable{ProcessChain}=Nullable{ProcessChain}()) =
spawn(cmds, spawn_opts_swallow(args...)...; chain=chain)
function eachline(cmd::AbstractCmd, stdin)
stdout = Pipe()
processes = spawn(cmd, (stdin,stdout,STDERR))
close(stdout.in)
out = stdout.out
# implicitly close after reading lines, since we opened
return EachLine(out, ()->close(out))
end
eachline(cmd::AbstractCmd) = eachline(cmd, DevNull)
# return a Process object to read-to/write-from the pipeline
function open(cmds::AbstractCmd, mode::AbstractString="r", other::Redirectable=DevNull)
if mode == "r"
in = other
out = io = Pipe()
processes = spawn(cmds, (in,out,STDERR))
close(out.in)
elseif mode == "w"
in = io = Pipe()
out = other
processes = spawn(cmds, (in,out,STDERR))
close(in.out)
else
throw(ArgumentError("mode must be \"r\" or \"w\", not \"$mode\""))
end
return (io, processes)
end
function open(f::Function, cmds::AbstractCmd, args...)
io, P = open(cmds, args...)
ret = try
f(io)
catch
kill(P)
rethrow()
finally
close(io)
end
success(P) || pipeline_error(P)
return ret
end
# TODO: deprecate this
function readandwrite(cmds::AbstractCmd)
in = Pipe()
out, processes = open(cmds, "r", in)
(out, in, processes)
end
function readbytes(cmd::AbstractCmd, stdin::Redirectable=DevNull)
out, procs = open(cmd, "r", stdin)
bytes = readbytes(out)
!success(procs) && pipeline_error(procs)
return bytes
end
function readall(cmd::AbstractCmd, stdin::Redirectable=DevNull)
return bytestring(readbytes(cmd, stdin))
end
function writeall(cmd::AbstractCmd, stdin::AbstractString, stdout::Redirectable=DevNull)
open(cmd, "w", stdout) do io
write(io, stdin)
end
end
function run(cmds::AbstractCmd, args...)
ps = spawn(cmds, spawn_opts_inherit(args...)...)
success(ps) ? nothing : pipeline_error(ps)
end
const SIGPIPE = 13
function test_success(proc::Process)
assert(process_exited(proc))
if proc.exitcode < 0
#TODO: this codepath is not currently tested
throw(UVError("could not start process $(string(proc.cmd))", proc.exitcode))
end
proc.exitcode == 0 && (proc.termsignal == 0 || proc.termsignal == SIGPIPE)
end
function success(x::Process)
wait(x)
kill(x)
test_success(x)
end
success(procs::Vector{Process}) = mapreduce(success, &, procs)
success(procs::ProcessChain) = success(procs.processes)
success(cmd::AbstractCmd) = success(spawn(cmd))
function pipeline_error(proc::Process)
if !proc.cmd.ignorestatus
error("failed process: ", proc, " [", proc.exitcode, "]")
end
nothing
end
function pipeline_error(procs::ProcessChain)
failed = Process[]
for p = procs.processes
if !test_success(p) && !p.cmd.ignorestatus
push!(failed, p)
end
end
length(failed) == 0 && return nothing
length(failed) == 1 && pipeline_error(failed[1])
msg = "failed processes:"
for proc in failed
msg = string(msg, "\n ", proc, " [", proc.exitcode, "]")
end
error(msg)
end
_jl_kill(p::Process, signum::Integer) = ccall(:uv_process_kill, Int32, (Ptr{Void},Int32), p.handle, signum)
function kill(p::Process, signum::Integer)
if process_running(p)
@assert p.handle != C_NULL
_jl_kill(p, signum)
else
Int32(-1)
end
end
kill(ps::Vector{Process}) = map(kill, ps)
kill(ps::ProcessChain) = map(kill, ps.processes)
kill(p::Process) = kill(p, 15) #SIGTERM
function _contains_newline(bufptr::Ptr{Void}, len::Int32)
return (ccall(:memchr, Ptr{Void}, (Ptr{Void},Int32,Csize_t), bufptr, '\n', len) != C_NULL)
end
## process status ##
process_running(s::Process) = s.exitcode == typemin(fieldtype(Process, :exitcode))
process_running(s::Vector{Process}) = any(process_running, s)
process_running(s::ProcessChain) = process_running(s.processes)
process_exited(s::Process) = !process_running(s)
process_exited(s::Vector{Process}) = all(process_exited, s)
process_exited(s::ProcessChain) = process_exited(s.processes)
process_signaled(s::Process) = (s.termsignal > 0)
#process_stopped (s::Process) = false #not supported by libuv. Do we need this?
#process_stop_signal(s::Process) = false #not supported by libuv. Do we need this?
function process_status(s::Process)
process_running(s) ? "ProcessRunning" :
process_signaled(s) ? "ProcessSignaled("*string(s.termsignal)*")" :
#process_stopped(s) ? "ProcessStopped("*string(process_stop_signal(s))*")" :
process_exited(s) ? "ProcessExited("*string(s.exitcode)*")" :
error("process status error")
end
## implementation of `cmd` syntax ##
arg_gen() = ByteString[]
arg_gen(x::AbstractString) = ByteString[cstr(x)]
arg_gen(cmd::Cmd) = cmd.exec
function arg_gen(head)
if applicable(start, head)
vals = ByteString[]
for x in head
push!(vals, cstr(string(x)))
end
return vals
else
return ByteString[cstr(string(head))]
end
end
function arg_gen(head, tail...)
head = arg_gen(head)
tail = arg_gen(tail...)
vals = ByteString[]
for h = head, t = tail
push!(vals, cstr(bytestring(h, t)))
end
vals
end
function cmd_gen(parsed)
args = ByteString[]
for arg in parsed
append!(args, arg_gen(arg...))
end
Cmd(args)
end
macro cmd(str)
:(cmd_gen($(shell_parse(str)[1])))
end
wait(x::Process) = if !process_exited(x); stream_wait(x, x.exitnotify); end
wait(x::ProcessChain) = for p in x.processes; wait(p); end
show(io::IO, p::Process) = print(io, "Process(", p.cmd, ", ", process_status(p), ")")