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"""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 == 'windows': # ???
# XXX should 'args' be cmd[1:] or cmd?
# XXX how do we detect failure?
# XXX how to do this in pre-1.5.2?
# XXX is P_WAIT the correct mode?
# XXX how to make Windows search the path?
if verbose:
print string.join (cmd, ' ')
if not dry_run:
os.spawnv (os.P_WAIT, cmd[0], cmd[1:])
else:
raise DistutilsPlatformError, \
"don't know how to spawn programs on platform '%s'" % os.name
# spawn ()
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 ()
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