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spawn.pyc
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2005-10-18
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# Source Generated with Decompyle++
# File: in.pyc (Python 2.4)
"""distutils.spawn
Provides the 'spawn()' function, a front-end to various platform-
specific functions for launching another program in a sub-process.
Also provides the 'find_executable()' to search the path for a given
executable name.
"""
__revision__ = '$Id: spawn.py,v 1.19 2004/11/10 22:23:14 loewis Exp $'
import sys
import os
import string
from distutils.errors import *
from distutils import log
def spawn(cmd, search_path = 1, verbose = 0, dry_run = 0):
"""Run another program, specified as a command list 'cmd', in a new
process. 'cmd' 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 'search_path' is true (the default), the system's executable
search path will be used to find the program; otherwise, cmd[0]
must be the exact path to the executable. If 'dry_run' is true,
the command will not actually be run.
Raise DistutilsExecError if running the program fails in any way; just
return on success.
"""
if os.name == 'posix':
_spawn_posix(cmd, search_path, dry_run = dry_run)
elif os.name == 'nt':
_spawn_nt(cmd, search_path, dry_run = dry_run)
elif os.name == 'os2':
_spawn_os2(cmd, search_path, dry_run = dry_run)
else:
raise DistutilsPlatformError, "don't know how to spawn programs on platform '%s'" % os.name
def _nt_quote_args(args):
'''Quote command-line arguments for DOS/Windows conventions: just
wraps every argument which contains blanks in double quotes, and
returns a new argument list.
'''
for i in range(len(args)):
if string.find(args[i], ' ') != -1:
args[i] = '"%s"' % args[i]
continue
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:
if not find_executable(executable):
pass
executable = executable
log.info(string.join([
executable] + cmd[1:], ' '))
if not dry_run:
try:
rc = os.spawnv(os.P_WAIT, executable, cmd)
except OSError:
exc = None
raise DistutilsExecError, "command '%s' failed: %s" % (cmd[0], exc[-1])
if rc != 0:
raise DistutilsExecError, "command '%s' failed with exit status %d" % (cmd[0], rc)
def _spawn_os2(cmd, search_path = 1, verbose = 0, dry_run = 0):
executable = cmd[0]
if search_path:
if not find_executable(executable):
pass
executable = executable
log.info(string.join([
executable] + cmd[1:], ' '))
if not dry_run:
try:
rc = os.spawnv(os.P_WAIT, executable, cmd)
except OSError:
exc = None
raise DistutilsExecError, "command '%s' failed: %s" % (cmd[0], exc[-1])
if rc != 0:
print "command '%s' failed with exit status %d" % (cmd[0], rc)
raise DistutilsExecError, "command '%s' failed with exit status %d" % (cmd[0], rc)
def _spawn_posix(cmd, search_path = 1, verbose = 0, dry_run = 0):
log.info(string.join(cmd, ' '))
if dry_run:
return None
if not search_path or os.execvp:
pass
exec_fn = os.execv
pid = os.fork()
if pid == 0:
try:
exec_fn(cmd[0], cmd)
except OSError:
e = None
sys.stderr.write('unable to execute %s: %s\n' % (cmd[0], e.strerror))
os._exit(1)
sys.stderr.write('unable to execute %s for unknown reasons' % cmd[0])
os._exit(1)
else:
while None:
try:
(pid, status) = os.waitpid(pid, 0)
except OSError:
exc = None
import errno as errno
if exc.errno == errno.EINTR:
continue
raise DistutilsExecError, "command '%s' failed: %s" % (cmd[0], exc[-1])
None if os.WIFSIGNALED(status) else exit_status == 0
if os.WIFSTOPPED(status):
continue
continue
raise DistutilsExecError, "unknown error executing '%s': termination status %d" % (cmd[0], status)
def find_executable(executable, path = None):
"""Try to find 'executable' in the directories listed in 'path' (a
string listing directories separated by 'os.pathsep'; defaults to
os.environ['PATH']). Returns the complete filename or None if not
found.
"""
if path is None:
path = os.environ['PATH']
paths = string.split(path, os.pathsep)
(base, ext) = os.path.splitext(executable)
if (sys.platform == 'win32' or os.name == 'os2') and ext != '.exe':
executable = executable + '.exe'
if not os.path.isfile(executable):
for p in paths:
f = os.path.join(p, executable)
if os.path.isfile(f):
return f
continue
return None
else:
return executable