#
# This file is free software, which comes along with NIT. This software is
# distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
-# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. You can modify it is you want, provided this header
# is kept unaltered, and a notification of the changes is added.
# You are allowed to redistribute it and sell it, alone or is a part of
# another product.
-# This module handle simple system calls
-# Standard input and output can be handleb trougth streams.
-package exec
+# Invocation and management of operating system sub-processes.
+# Standard input and output can be handled through streams.
+module exec
-import stream
+import file
-# Simple sub-processus
+# Simple sub-process
class Process
+ # The pid of the process
+ fun id: Int do return data.id
- # The pid of the processus
- meth id: Int do return _data.id
+ # Is the process finished?
+ fun is_finished: Bool do return data.is_finished
- # Is the processus finished?
- meth is_finished: Bool do return _data.is_finished
-
- # wait the terminaison of the process
- meth wait
+ # Wait the termination of the process
+ fun wait
do
- _data.wait
+ data.wait
assert is_finished
end
-
+
# The status once finished
- meth status: Int
+ fun status: Int
do
assert is_finished
- return _data.status
+ return data.status
end
- # send a signal to the process
- meth kill(signal: Int) do _data.kill(signal)
+ # The executable run
+ # Is a filepath, or a executable found in PATH
+ var command: String
- # send the TERM (15) signal
- meth term do kill(15)
+ # The arguments of the command
+ # Starts with the first real arguments---ie. does not include the progname (`argv[0]`, in C)
+ var arguments: nullable Array[String]
- # launch a command with some arguments
- init(command: String, arguments: String...)
- do
- execute(command, arguments, 0)
+ # Launch a command with some arguments
+ init(command: String, arguments: String...) is old_style_init do
+ self.command = command
+ self.arguments = arguments
+ execute
end
- # launch a simple command without arguments
- init init_(command: String)
+ # Launch a simple command with arguments passed as an array
+ init from_a(command: String, arguments: nullable Array[String])
do
- execute(command, null, 0)
+ self.command = command
+ self.arguments = arguments
+ execute
end
- # Internal code to handle execusion
- protected init execute(command: String, arguments: Array[String], pipeflags: Int)
+ # flags used internally to know whith pipe to open
+ private fun pipeflags: Int do return 0
+
+ # Internal code to handle execution
+ protected fun execute
do
- var args = new String
+ # The pass the arguments as a big C string where elements are separated with '\0'
+ var args = new FlatBuffer
var l = 1 # Number of elements in args
args.append(command)
if arguments != null then
for a in arguments do
args.add('\0')
+ #a.output_class_name
args.append(a)
end
l += arguments.length
end
- _data = basic_exec_execute(command.to_cstring, args.to_cstring, l, pipeflags)
+ data = basic_exec_execute(command.to_cstring, args.to_s.to_cstring, l, pipeflags)
end
-
- attr _data: NativeProcess
- private meth basic_exec_execute(p: NativeString, av: NativeString, ac: Int, pf: Int): NativeProcess is extern "exec_Process_Process_basic_exec_execute_4"
+
+ private var data: NativeProcess
+ private fun basic_exec_execute(p: NativeString, av: NativeString, ac: Int, pf: Int): NativeProcess is extern "exec_Process_Process_basic_exec_execute_4"
end
-# stdout of the processus is readable
-class IProcess
-special Process
-special IStream
- attr _in: FDIStream
-
- redef meth close do _in.close
-
- redef meth read_char do return _in.read_char
+# `Process` on which the `stdout` is readable like a `Reader`
+class ProcessReader
+ super Process
+ super Reader
- redef meth eof do return _in.eof
+ # File Descriptor used for the input.
+ var stream_in: FileReader is noinit
- redef init(command: String, arguments: String...)
- do
- execute(command, arguments, 2)
- _in = new FDIStream(_data.out_fd)
- end
-
- redef init init_(command: String)
+ redef fun close do stream_in.close
+
+ redef fun read_char do return stream_in.read_char
+
+ redef fun eof do return stream_in.eof
+
+ redef fun pipeflags do return 2
+
+ redef fun execute
do
- execute(command, null, 2)
- _in = new FDIStream(_data.out_fd)
+ super
+ stream_in = new FileReader.from_fd(data.out_fd)
end
end
-# stdin of the processus is writable
-class OProcess
-special Process
-special OStream
- attr _out: OStream
+# `Process` on which `stdin` is writable like a `Writer`
+class ProcessWriter
+ super Process
+ super Writer
- redef meth close do _out.close
+ # File Descriptor used for the output.
+ var stream_out: Writer is noinit
- redef meth is_writable do return _out.is_writable
+ redef fun close do stream_out.close
- redef meth write(s) do _out.write(s)
-
- redef init(command: String, arguments: String...)
- do
- execute(command, arguments, 1)
- _out = new FDOStream(_data.in_fd)
- end
-
- redef init init_(command: String)
+ redef fun is_writable do return stream_out.is_writable
+
+ redef fun write(s) do stream_out.write(s)
+
+ redef fun pipeflags do return 1
+
+ redef fun execute
do
- execute(command, null, 1)
- _out = new FDOStream(_data.in_fd)
+ super
+ var out = new FileWriter.from_fd(data.in_fd)
+ out.set_buffering_mode(0, sys.buffer_mode_none)
+ stream_out = out
end
end
-# stdin and stdout are both accessible
-class IOProcess
-special IProcess
-special OProcess
-special IOStream
+# `Process` on which stdout can be read and stdin can be written to like a `Duplex`
+class ProcessDuplex
+ super ProcessReader
+ super ProcessWriter
+ super Duplex
- redef meth close
+ redef fun close
do
- _in.close
- _out.close
+ stream_in.close
+ stream_out.close
end
- redef init(command: String, arguments: String...)
- do
- execute(command, arguments, 3)
- _in = new FDIStream(_data.out_fd)
- _out = new FDOStream(_data.in_fd)
- end
-
- redef init init_(command: String)
+ redef fun pipeflags do return 3
+
+ redef fun execute
do
- execute(command, null, 3)
- _in = new FDIStream(_data.out_fd)
- _out = new FDOStream(_data.in_fd)
+ super
end
end
redef class Sys
- # Execute a shell command and return it's error code
- meth system(command: String): Int
+ # Execute a shell command and return its error code
+ fun system(command: String): Int
do
- return command.to_cstring.system
+ return command.to_cstring.system
end
end
redef class NativeString
- meth system: Int is extern "string_NativeString_NativeString_system_0"
+ # Execute self as a shell command.
+ #
+ # See the posix function system(3).
+ fun system: Int is extern "string_NativeString_NativeString_system_0"
end
-private universal NativeProcess
-special Pointer
- meth id: Int is extern "exec_NativeProcess_NativeProcess_id_0"
- meth is_finished: Bool is extern "exec_NativeProcess_NativeProcess_is_finished_0"
- meth status: Int is extern "exec_NativeProcess_NativeProcess_status_0"
- meth wait is extern "exec_NativeProcess_NativeProcess_wait_0"
- meth kill(s: Int) is extern "exec_NativeProcess_NativeProcess_kill_1"
-
- meth in_fd: Int is extern "exec_NativeProcess_NativeProcess_in_fd_0"
- meth out_fd: Int is extern "exec_NativeProcess_NativeProcess_out_fd_0"
- meth err_fd: Int is extern "exec_NativeProcess_NativeProcess_err_fd_0"
+private extern class NativeProcess
+ fun id: Int is extern "exec_NativeProcess_NativeProcess_id_0"
+ fun is_finished: Bool is extern "exec_NativeProcess_NativeProcess_is_finished_0"
+ fun status: Int is extern "exec_NativeProcess_NativeProcess_status_0"
+ fun wait is extern "exec_NativeProcess_NativeProcess_wait_0"
+
+ fun in_fd: Int is extern "exec_NativeProcess_NativeProcess_in_fd_0"
+ fun out_fd: Int is extern "exec_NativeProcess_NativeProcess_out_fd_0"
+ fun err_fd: Int is extern "exec_NativeProcess_NativeProcess_err_fd_0"
end