Python os 模块，P_WAIT 实例源码

def exec_spawn(l, env):
    try:
        result = spawnve(os.P_WAIT, l[0], l, env)
    except (OSError, EnvironmentError) as e:
        try:
            result = exitvalmap[e.errno]
            sys.stderr.write("scons: %s: %s\n" % (l[0], e.strerror))
        except KeyError:
            result = 127
            if len(l) > 2:
                if len(l[2]) < 1000:
                    command = ' '.join(l[0:3])
                else:
                    command = l[0]
            else:
                command = l[0]
            sys.stderr.write("scons: unknown OSError exception code %d - '%s': %s\n" % (e.errno, command, e.strerror))
    return result

def exec_spawn(l, env):
    try:
        result = spawnve(os.P_WAIT, l[0], l, env)
    except OSError, e:
        try:
            result = exitvalmap[e[0]]
            sys.stderr.write("scons: %s: %s\n" % (l[0], e[1]))
        except KeyError:
            result = 127
            if len(l) > 2:
                if len(l[2]) < 1000:
                    command = ' '.join(l[0:3])
                else:
                    command = l[0]
            else:
                command = l[0]
            sys.stderr.write("scons: unknown OSError exception code %d - '%s': %s\n" % (e[0], command, e[1]))
    return result

def exec_spawn(l, env):
    try:
        result = spawnve(os.P_WAIT, l[0], l, env)
    except OSError, e:
        try:
            result = exitvalmap[e[0]]
            sys.stderr.write("scons: %s: %s\n" % (l[0], e[1]))
        except KeyError:
            result = 127
            if len(l) > 2:
                if len(l[2]) < 1000:
                    command = ' '.join(l[0:3])
                else:
                    command = l[0]
            else:
                command = l[0]
            sys.stderr.write("scons: unknown OSError exception code %d - '%s': %s\n" % (e[0], command, e[1]))
    return result

def spawnve(mode, file, args, env):
        spawn_lock.acquire()
        try:
            if mode == os.P_WAIT:
                ret = os.spawnve(os.P_NOWAIT, file, args, env)
            else:
                ret = os.spawnve(mode, file, args, env)
        finally:
            spawn_lock.release()
        if mode == os.P_WAIT:
            pid, status = os.waitpid(ret, 0)
            ret = status >> 8
        return ret

def generate_images(stl_directory_name, blender_args=None):
        output_directory = tempfile.mkdtemp()

        if not blender_args:
            blender_args = ['blender',
                    '-b', '-P', 'image_match_generator.py', '--',
                    '-d', abspath(expanduser(stl_directory_name)),
                    '-o', output_directory,
                    '--no-rotations',
                    '--only-front-view']

        spawnvp(P_WAIT, 'blender', blender_args)
        return output_directory

def _restart_application_with_autoreload():
    while True:
        new_environ = os.environ.copy()
        new_environ['RUN_MAIN_APP'] = 'true'
        exit_code = os.spawnve(
            os.P_WAIT,
            sys.executable,
            [sys.executable] + sys.argv,
            new_environ
        )
        if exit_code != RELOAD_EXIT_CODE:
            return exit_code

def spawnve(mode, file, args, env):
        spawn_lock.acquire()
        try:
            if mode == os.P_WAIT:
                ret = os.spawnve(os.P_NOWAIT, file, args, env)
            else:
                ret = os.spawnve(mode, file, args, env)
        finally:
            spawn_lock.release()
        if mode == os.P_WAIT:
            pid, status = os.waitpid(ret, 0)
            ret = status >> 8
        return ret

def launch_wxglade(self, options, wait=False):
        path = self.GetWxGladePath()
        glade = os.path.join(path, 'wxglade.py')
        if wx.Platform == '__WXMSW__':
            glade = "\"%s\"" % glade
        mode = {False: os.P_NOWAIT, True: os.P_WAIT}[wait]
        os.spawnv(mode, sys.executable, ["\"%s\"" % sys.executable] + [glade] + options)

def spawnve(mode, file, args, env):
        spawn_lock.acquire()
        try:
            if mode == os.P_WAIT:
                ret = os.spawnve(os.P_NOWAIT, file, args, env)
            else:
                ret = os.spawnve(mode, file, args, env)
        finally:
            spawn_lock.release()
        if mode == os.P_WAIT:
            pid, status = os.waitpid(ret, 0)
            ret = status >> 8
        return ret

def piped_spawn(sh, escape, cmd, args, env, stdout, stderr):
    # There is no direct way to do that in python. What we do
    # here should work for most cases:
    #   In case stdout (stderr) is not redirected to a file,
    #   we redirect it into a temporary file tmpFileStdout
    #   (tmpFileStderr) and copy the contents of this file
    #   to stdout (stderr) given in the argument
    if not sh:
        sys.stderr.write("scons: Could not find command interpreter, is it in your PATH?\n")
        return 127
    else:
        # one temporary file for stdout and stderr
        tmpFileStdout = os.path.normpath(tempfile.mktemp())
        tmpFileStderr = os.path.normpath(tempfile.mktemp())

        # check if output is redirected
        stdoutRedirected = 0
        stderrRedirected = 0
        for arg in args:
            # are there more possibilities to redirect stdout ?
            if arg.find( ">", 0, 1 ) != -1 or arg.find( "1>", 0, 2 ) != -1:
                stdoutRedirected = 1
            # are there more possibilities to redirect stderr ?
            if arg.find( "2>", 0, 2 ) != -1:
                stderrRedirected = 1

        # redirect output of non-redirected streams to our tempfiles
        if stdoutRedirected == 0:
            args.append(">" + str(tmpFileStdout))
        if stderrRedirected == 0:
            args.append("2>" + str(tmpFileStderr))

        # actually do the spawn
        try:
            args = [sh, '/C', escape(' '.join(args)) ]
            ret = spawnve(os.P_WAIT, sh, args, env)
        except OSError as e:
            # catch any error
            try:
                ret = exitvalmap[e[0]]
            except KeyError:
                sys.stderr.write("scons: unknown OSError exception code %d - %s: %s\n" % (e[0], cmd, e[1]))
            if stderr is not None:
                stderr.write("scons: %s: %s\n" % (cmd, e[1]))
        # copy child output from tempfiles to our streams
        # and do clean up stuff
        if stdout is not None and stdoutRedirected == 0:
            try:
                stdout.write(open( tmpFileStdout, "r" ).read())
                os.remove( tmpFileStdout )
            except (IOError, OSError):
                pass

        if stderr is not None and stderrRedirected == 0:
            try:
                stderr.write(open( tmpFileStderr, "r" ).read())
                os.remove( tmpFileStderr )
            except (IOError, OSError):
                pass
        return ret

def piped_spawn(sh, escape, cmd, args, env, stdout, stderr):
    # There is no direct way to do that in python. What we do
    # here should work for most cases:
    #   In case stdout (stderr) is not redirected to a file,
    #   we redirect it into a temporary file tmpFileStdout
    #   (tmpFileStderr) and copy the contents of this file
    #   to stdout (stderr) given in the argument
    if not sh:
        sys.stderr.write("scons: Could not find command interpreter, is it in your PATH?\n")
        return 127
    else:
        # one temporary file for stdout and stderr
        tmpFileStdout = os.path.normpath(tempfile.mktemp())
        tmpFileStderr = os.path.normpath(tempfile.mktemp())

        # check if output is redirected
        stdoutRedirected = 0
        stderrRedirected = 0
        for arg in args:
            # are there more possibilities to redirect stdout ?
            if (arg.find( ">", 0, 1 ) != -1 or
                arg.find( "1>", 0, 2 ) != -1):
                stdoutRedirected = 1
            # are there more possibilities to redirect stderr ?
            if arg.find( "2>", 0, 2 ) != -1:
                stderrRedirected = 1

        # redirect output of non-redirected streams to our tempfiles
        if stdoutRedirected == 0:
            args.append(">" + str(tmpFileStdout))
        if stderrRedirected == 0:
            args.append("2>" + str(tmpFileStderr))

        # actually do the spawn
        try:
            args = [sh, '/C', escape(' '.join(args)) ]
            ret = spawnve(os.P_WAIT, sh, args, env)
        except OSError, e:
            # catch any error
            try:
                ret = exitvalmap[e[0]]
            except KeyError:
                sys.stderr.write("scons: unknown OSError exception code %d - %s: %s\n" % (e[0], cmd, e[1]))
            if stderr is not None:
                stderr.write("scons: %s: %s\n" % (cmd, e[1]))
        # copy child output from tempfiles to our streams
        # and do clean up stuff
        if stdout is not None and stdoutRedirected == 0:
            try:
                stdout.write(open( tmpFileStdout, "r" ).read())
                os.remove( tmpFileStdout )
            except (IOError, OSError):
                pass

        if stderr is not None and stderrRedirected == 0:
            try:
                stderr.write(open( tmpFileStderr, "r" ).read())
                os.remove( tmpFileStderr )
            except (IOError, OSError):
                pass
        return ret

def piped_spawn(sh, escape, cmd, args, env, stdout, stderr):
    # There is no direct way to do that in python. What we do
    # here should work for most cases:
    #   In case stdout (stderr) is not redirected to a file,
    #   we redirect it into a temporary file tmpFileStdout
    #   (tmpFileStderr) and copy the contents of this file
    #   to stdout (stderr) given in the argument
    if not sh:
        sys.stderr.write("scons: Could not find command interpreter, is it in your PATH?\n")
        return 127
    else:
        # one temporary file for stdout and stderr
        tmpFileStdout = os.path.normpath(tempfile.mktemp())
        tmpFileStderr = os.path.normpath(tempfile.mktemp())

        # check if output is redirected
        stdoutRedirected = 0
        stderrRedirected = 0
        for arg in args:
            # are there more possibilities to redirect stdout ?
            if (arg.find( ">", 0, 1 ) != -1 or
                arg.find( "1>", 0, 2 ) != -1):
                stdoutRedirected = 1
            # are there more possibilities to redirect stderr ?
            if arg.find( "2>", 0, 2 ) != -1:
                stderrRedirected = 1

        # redirect output of non-redirected streams to our tempfiles
        if stdoutRedirected == 0:
            args.append(">" + str(tmpFileStdout))
        if stderrRedirected == 0:
            args.append("2>" + str(tmpFileStderr))

        # actually do the spawn
        try:
            args = [sh, '/C', escape(' '.join(args)) ]
            ret = spawnve(os.P_WAIT, sh, args, env)
        except OSError, e:
            # catch any error
            try:
                ret = exitvalmap[e[0]]
            except KeyError:
                sys.stderr.write("scons: unknown OSError exception code %d - %s: %s\n" % (e[0], cmd, e[1]))
            if stderr is not None:
                stderr.write("scons: %s: %s\n" % (cmd, e[1]))
        # copy child output from tempfiles to our streams
        # and do clean up stuff
        if stdout is not None and stdoutRedirected == 0:
            try:
                stdout.write(open( tmpFileStdout, "r" ).read())
                os.remove( tmpFileStdout )
            except (IOError, OSError):
                pass

        if stderr is not None and stderrRedirected == 0:
            try:
                stderr.write(open( tmpFileStderr, "r" ).read())
                os.remove( tmpFileStderr )
            except (IOError, OSError):
                pass
        return ret