mirror of
https://github.com/python/cpython.git
synced 2024-11-24 17:47:13 +01:00
126 lines
4.2 KiB
Python
126 lines
4.2 KiB
Python
"""distutils.spawn
|
|
|
|
Provides the 'spawn()' function, a front-end to various platform-
|
|
specific functions for launching another program in a sub-process."""
|
|
|
|
# created 1999/07/24, Greg Ward
|
|
|
|
__rcsid__ = "$Id$"
|
|
|
|
import sys, os, string
|
|
from distutils.errors import *
|
|
|
|
|
|
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 'verbose' is true, a
|
|
one-line summary of the command will be printed before it is run.
|
|
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, verbose, dry_run)
|
|
elif os.name == 'nt':
|
|
_spawn_nt (cmd, search_path, verbose, dry_run)
|
|
else:
|
|
raise DistutilsPlatformError, \
|
|
"don't know how to spawn programs on platform '%s'" % os.name
|
|
|
|
# spawn ()
|
|
|
|
|
|
def _spawn_nt ( cmd,
|
|
search_path=1,
|
|
verbose=0,
|
|
dry_run=0):
|
|
executable = cmd[0]
|
|
if search_path:
|
|
paths = string.split( os.environ['PATH'], os.pathsep)
|
|
base,ext = os.path.splitext(executable)
|
|
if (ext != '.exe'):
|
|
executable = executable + '.exe'
|
|
if not os.path.isfile(executable):
|
|
paths.reverse() # go over the paths and keep the last one
|
|
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
|
|
executable = f
|
|
if verbose:
|
|
print string.join ( [executable] + cmd[1:], ' ')
|
|
if not dry_run:
|
|
# spawn for NT requires a full path to the .exe
|
|
rc = os.spawnv (os.P_WAIT, executable, cmd)
|
|
if rc != 0:
|
|
raise DistutilsExecError("command failed: %d" % rc)
|
|
|
|
|
|
|
|
def _spawn_posix (cmd,
|
|
search_path=1,
|
|
verbose=0,
|
|
dry_run=0):
|
|
|
|
if verbose:
|
|
print string.join (cmd, ' ')
|
|
if dry_run:
|
|
return
|
|
exec_fn = search_path and os.execvp or os.execv
|
|
|
|
pid = os.fork ()
|
|
|
|
if pid == 0: # in the child
|
|
try:
|
|
#print "cmd[0] =", cmd[0]
|
|
#print "cmd =", cmd
|
|
exec_fn (cmd[0], cmd)
|
|
except OSError, e:
|
|
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: # in the parent
|
|
# Loop until the child either exits or is terminated by a signal
|
|
# (ie. keep waiting if it's merely stopped)
|
|
while 1:
|
|
(pid, status) = os.waitpid (pid, 0)
|
|
if os.WIFSIGNALED (status):
|
|
raise DistutilsExecError, \
|
|
"command %s terminated by signal %d" % \
|
|
(cmd[0], os.WTERMSIG (status))
|
|
|
|
elif os.WIFEXITED (status):
|
|
exit_status = os.WEXITSTATUS (status)
|
|
if exit_status == 0:
|
|
return # hey, it succeeded!
|
|
else:
|
|
raise DistutilsExecError, \
|
|
"command %s failed with exit status %d" % \
|
|
(cmd[0], exit_status)
|
|
|
|
elif os.WIFSTOPPED (status):
|
|
continue
|
|
|
|
else:
|
|
raise DistutilsExecError, \
|
|
"unknown error executing %s: termination status %d" % \
|
|
(cmd[0], status)
|
|
# _spawn_posix ()
|