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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;distutils.spawn

Provides the &#039;spawn()&#039; function, a front-end to various platform-
specific functions for launching another program in a sub-process.
Also provides the &#039;find_executable()&#039; to search the path for a given
executable name.
&quot;&quot;&quot;

import sys
import os

from distutils.errors import DistutilsPlatformError, DistutilsExecError
from distutils.debug import DEBUG
from distutils import log

def spawn(cmd, search_path=1, verbose=0, dry_run=0):
    &quot;&quot;&quot;Run another program, specified as a command list &#039;cmd&#039;, in a new process.

    &#039;cmd&#039; is just the argument list for the new process, ie.
    cmd[0] is the program to run and cmd[1:] are the rest of its arguments.
    There is no way to run a program with a name different from that of its
    executable.

    If &#039;search_path&#039; is true (the default), the system&#039;s executable
    search path will be used to find the program; otherwise, cmd[0]
    must be the exact path to the executable.  If &#039;dry_run&#039; is true,
    the command will not actually be run.

    Raise DistutilsExecError if running the program fails in any way; just
    return on success.
    &quot;&quot;&quot;
    # cmd is documented as a list, but just in case some code passes a tuple
    # in, protect our %-formatting code against horrible death
    cmd = list(cmd)
    if os.name == &#039;posix&#039;:
        _spawn_posix(cmd, search_path, dry_run=dry_run)
    elif os.name == &#039;nt&#039;:
        _spawn_nt(cmd, search_path, dry_run=dry_run)
    else:
        raise DistutilsPlatformError(
              &quot;don&#039;t know how to spawn programs on platform &#039;%s&#039;&quot; % os.name)

def _nt_quote_args(args):
    &quot;&quot;&quot;Quote command-line arguments for DOS/Windows conventions.

    Just wraps every argument which contains blanks in double quotes, and
    returns a new argument list.
    &quot;&quot;&quot;
    # XXX this doesn&#039;t seem very robust to me -- but if the Windows guys
    # say it&#039;ll work, I guess I&#039;ll have to accept it.  (What if an arg
    # contains quotes?  What other magic characters, other than spaces,
    # have to be escaped?  Is there an escaping mechanism other than
    # quoting?)
    for i, arg in enumerate(args):
        if &#039; &#039; in arg:
            args[i] = &#039;&quot;%s&quot;&#039; % arg
    return args

def _spawn_nt(cmd, search_path=1, verbose=0, dry_run=0):
    executable = cmd[0]
    cmd = _nt_quote_args(cmd)
    if search_path:
        # either we find one or it stays the same
        executable = find_executable(executable) or executable
    log.info(&#039; &#039;.join([executable] + cmd[1:]))
    if not dry_run:
        # spawn for NT requires a full path to the .exe
        try:
            rc = os.spawnv(os.P_WAIT, executable, cmd)
        except OSError as exc:
            # this seems to happen when the command isn&#039;t found
            if not DEBUG:
                cmd = executable
            raise DistutilsExecError(
                  &quot;command %r failed: %s&quot; % (cmd, exc.args[-1]))
        if rc != 0:
            # and this reflects the command running but failing
            if not DEBUG:
                cmd = executable
            raise DistutilsExecError(
                  &quot;command %r failed with exit status %d&quot; % (cmd, rc))

if sys.platform == &#039;darwin&#039;:
    from distutils import sysconfig
    _cfg_target = None
    _cfg_target_split = None

def _spawn_posix(cmd, search_path=1, verbose=0, dry_run=0):
    log.info(&#039; &#039;.join(cmd))
    if dry_run:
        return
    executable = cmd[0]
    exec_fn = search_path and os.execvp or os.execv
    env = None
    if sys.platform == &#039;darwin&#039;:
        global _cfg_target, _cfg_target_split
        if _cfg_target is None:
            _cfg_target = sysconfig.get_config_var(
                                  &#039;MACOSX_DEPLOYMENT_TARGET&#039;) or &#039;&#039;
            if _cfg_target:
                _cfg_target_split = [int(x) for x in _cfg_target.split(&#039;.&#039;)]
        if _cfg_target:
            # ensure that the deployment target of build process is not less
            # than that used when the interpreter was built. This ensures
            # extension modules are built with correct compatibility values
            cur_target = os.environ.get(&#039;MACOSX_DEPLOYMENT_TARGET&#039;, _cfg_target)
            if _cfg_target_split &gt; [int(x) for x in cur_target.split(&#039;.&#039;)]:
                my_msg = (&#039;$MACOSX_DEPLOYMENT_TARGET mismatch: &#039;
                          &#039;now &quot;%s&quot; but &quot;%s&quot; during configure&#039;
                                % (cur_target, _cfg_target))
                raise DistutilsPlatformError(my_msg)
            env = dict(os.environ,
                       MACOSX_DEPLOYMENT_TARGET=cur_target)
            exec_fn = search_path and os.execvpe or os.execve
    pid = os.fork()
    if pid == 0: # in the child
        try:
            if env is None:
                exec_fn(executable, cmd)
            else:
                exec_fn(executable, cmd, env)
        except OSError as e:
            if not DEBUG:
                cmd = executable
            sys.stderr.write(&quot;unable to execute %r: %s\n&quot;
                             % (cmd, e.strerror))
            os._exit(1)

        if not DEBUG:
            cmd = executable
        sys.stderr.write(&quot;unable to execute %r for unknown reasons&quot; % cmd)
        os._exit(1)
    else: # in the parent
        # Loop until the child either exits or is terminated by a signal
        # (ie. keep waiting if it&#039;s merely stopped)
        while True:
            try:
                pid, status = os.waitpid(pid, 0)
            except OSError as exc:
                if not DEBUG:
                    cmd = executable
                raise DistutilsExecError(
                      &quot;command %r failed: %s&quot; % (cmd, exc.args[-1]))
            if os.WIFSIGNALED(status):
                if not DEBUG:
                    cmd = executable
                raise DistutilsExecError(
                      &quot;command %r terminated by signal %d&quot;
                      % (cmd, os.WTERMSIG(status)))
            elif os.WIFEXITED(status):
                exit_status = os.WEXITSTATUS(status)
                if exit_status == 0:
                    return   # hey, it succeeded!
                else:
                    if not DEBUG:
                        cmd = executable
                    raise DistutilsExecError(
                          &quot;command %r failed with exit status %d&quot;
                          % (cmd, exit_status))
            elif os.WIFSTOPPED(status):
                continue
            else:
                if not DEBUG:
                    cmd = executable
                raise DistutilsExecError(
                      &quot;unknown error executing %r: termination status %d&quot;
                      % (cmd, status))

def find_executable(executable, path=None):
    &quot;&quot;&quot;Tries to find &#039;executable&#039; in the directories listed in &#039;path&#039;.

    A string listing directories separated by &#039;os.pathsep&#039;; defaults to
    os.environ[&#039;PATH&#039;].  Returns the complete filename or None if not found.
    &quot;&quot;&quot;
    if path is None:
        path = os.environ.get(&#039;PATH&#039;, os.defpath)

    paths = path.split(os.pathsep)
    base, ext = os.path.splitext(executable)

    if (sys.platform == &#039;win32&#039;) and (ext != &#039;.exe&#039;):
        executable = executable + &#039;.exe&#039;

    if not os.path.isfile(executable):
        for p in paths:
            f = os.path.join(p, executable)
            if os.path.isfile(f):
                # the file exists, we have a shot at spawn working
                return f
        return None
    else:
        return executable
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