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bpo-20104: Change the file_actions parameter of os.posix_spawn(). (GH-6725) 

* Make its default value an empty tuple instead of None.
* Make it a keyword-only parameter.
This commit is contained in:
Serhiy Storchaka 2018-09-08 14:48:18 +03:00 committed by GitHub
parent fa221d804f
commit d700f97b62
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 41 additions and 40 deletions
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5
Doc/library/os.rst
View File

@ -3394,7 +3394,7 @@ written in Python, such as a mail server's external command delivery program.
subprocesses.
.. function:: posix_spawn(path, argv, env, file_actions=None, /, *, \
.. function:: posix_spawn(path, argv, env, *, file_actions=None, \
setpgroup=None, resetids=False, setsigmask=(), \
setsigdef=(), scheduler=None)
@ -3402,7 +3402,8 @@ written in Python, such as a mail server's external command delivery program.
Most users should use :func:`subprocess.run` instead of :func:`posix_spawn`.
The *path*, *args*, and *env* arguments are similar to :func:`execve`.
The positional-only arguments *path*, *args*, and *env* are similar to
:func:`execve`.
The *file_actions* argument may be a sequence of tuples describing actions
to take on specific file descriptors in the child process between the C

57
Lib/test/test_posix.py
View File

@ -1499,8 +1499,7 @@ class TestPosixSpawn(unittest.TestCase):
pidfile.write(str(os.getpid()))
"""
args = self.python_args('-c', script)
pid = posix.posix_spawn(args[0], args,
os.environ)
pid = posix.posix_spawn(args[0], args, os.environ)
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
with open(pidfile) as f:
self.assertEqual(f.read(), str(pid))
@ -1538,7 +1537,7 @@ class TestPosixSpawn(unittest.TestCase):
self.NOOP_PROGRAM[0],
self.NOOP_PROGRAM,
os.environ,
[]
file_actions=[]
)
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
@ -1691,37 +1690,38 @@ class TestPosixSpawn(unittest.TestCase):
]
pid = posix.posix_spawn(self.NOOP_PROGRAM[0],
self.NOOP_PROGRAM,
os.environ, file_actions)
os.environ,
file_actions=file_actions)
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
def test_bad_file_actions(self):
args = self.NOOP_PROGRAM
with self.assertRaises(TypeError):
posix.posix_spawn(args[0], args,
os.environ, [None])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[None])
with self.assertRaises(TypeError):
posix.posix_spawn(args[0], args,
os.environ, [()])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[()])
with self.assertRaises(TypeError):
posix.posix_spawn(args[0], args,
os.environ, [(None,)])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[(None,)])
with self.assertRaises(TypeError):
posix.posix_spawn(args[0], args,
os.environ, [(12345,)])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[(12345,)])
with self.assertRaises(TypeError):
posix.posix_spawn(args[0], args,
os.environ, [(os.POSIX_SPAWN_CLOSE,)])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[(os.POSIX_SPAWN_CLOSE,)])
with self.assertRaises(TypeError):
posix.posix_spawn(args[0], args,
os.environ, [(os.POSIX_SPAWN_CLOSE, 1, 2)])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[(os.POSIX_SPAWN_CLOSE, 1, 2)])
with self.assertRaises(TypeError):
posix.posix_spawn(args[0], args,
os.environ, [(os.POSIX_SPAWN_CLOSE, None)])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[(os.POSIX_SPAWN_CLOSE, None)])
with self.assertRaises(ValueError):
posix.posix_spawn(args[0], args,
os.environ,
[(os.POSIX_SPAWN_OPEN, 3, __file__ + '\0',
os.O_RDONLY, 0)])
posix.posix_spawn(args[0], args, os.environ,
file_actions=[(os.POSIX_SPAWN_OPEN,
3, __file__ + '\0',
os.O_RDONLY, 0)])
def test_open_file(self):
outfile = support.TESTFN
@ -1736,8 +1736,8 @@ class TestPosixSpawn(unittest.TestCase):
stat.S_IRUSR | stat.S_IWUSR),
]
args = self.python_args('-c', script)
pid = posix.posix_spawn(args[0], args,
os.environ, file_actions)
pid = posix.posix_spawn(args[0], args, os.environ,
file_actions=file_actions)
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
with open(outfile) as f:
self.assertEqual(f.read(), 'hello')
@ -1754,9 +1754,8 @@ class TestPosixSpawn(unittest.TestCase):
closefile.write('is closed %d' % e.errno)
"""
args = self.python_args('-c', script)
pid = posix.posix_spawn(args[0], args,
os.environ,
[(os.POSIX_SPAWN_CLOSE, 0),])
pid = posix.posix_spawn(args[0], args, os.environ,
file_actions=[(os.POSIX_SPAWN_CLOSE, 0),])
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
with open(closefile) as f:
self.assertEqual(f.read(), 'is closed %d' % errno.EBADF)
@ -1773,8 +1772,8 @@ class TestPosixSpawn(unittest.TestCase):
(os.POSIX_SPAWN_DUP2, childfile.fileno(), 1),
]
args = self.python_args('-c', script)
pid = posix.posix_spawn(args[0], args,
os.environ, file_actions)
pid = posix.posix_spawn(args[0], args, os.environ,
file_actions=file_actions)
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
with open(dupfile) as f:
self.assertEqual(f.read(), 'hello')

10
Modules/clinic/posixmodule.c.h generated
View File

@ -1730,7 +1730,7 @@ exit:
#if defined(HAVE_POSIX_SPAWN)
PyDoc_STRVAR(os_posix_spawn__doc__,
"posix_spawn($module, path, argv, env, file_actions=None, /, *,\n"
"posix_spawn($module, path, argv, env, /, *, file_actions=(),\n"
" setpgroup=None, resetids=False, setsigmask=(),\n"
" setsigdef=(), scheduler=None)\n"
"--\n"
@ -1769,12 +1769,12 @@ static PyObject *
os_posix_spawn(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
{
PyObject *return_value = NULL;
static const char * const _keywords[] = {"", "", "", "", "setpgroup", "resetids", "setsigmask", "setsigdef", "scheduler", NULL};
static _PyArg_Parser _parser = {"O&OO|O$OiOOO:posix_spawn", _keywords, 0};
static const char * const _keywords[] = {"", "", "", "file_actions", "setpgroup", "resetids", "setsigmask", "setsigdef", "scheduler", NULL};
static _PyArg_Parser _parser = {"O&OO|$OOiOOO:posix_spawn", _keywords, 0};
path_t path = PATH_T_INITIALIZE("posix_spawn", "path", 0, 0);
PyObject *argv;
PyObject *env;
PyObject *file_actions = Py_None;
PyObject *file_actions = NULL;
PyObject *setpgroup = NULL;
int resetids = 0;
PyObject *setsigmask = NULL;
@ -6648,4 +6648,4 @@ exit:
#ifndef OS_GETRANDOM_METHODDEF
#define OS_GETRANDOM_METHODDEF
#endif /* !defined(OS_GETRANDOM_METHODDEF) */
/*[clinic end generated code: output=ef78384ae88712e1 input=a9049054013a1b77]*/
/*[clinic end generated code: output=758ee0434fb03d90 input=a9049054013a1b77]*/

9
Modules/posixmodule.c
View File

@ -5405,10 +5405,10 @@ os.posix_spawn
Tuple or list of strings.
env: object
Dictionary of strings mapping to strings.
file_actions: object = None
A sequence of file action tuples.
/
*
file_actions: object(c_default='NULL') = ()
A sequence of file action tuples.
setpgroup: object = NULL
The pgroup to use with the POSIX_SPAWN_SETPGROUP flag.
resetids: bool(accept={int}) = False
@ -5419,6 +5419,7 @@ os.posix_spawn
The sigmask to use with the POSIX_SPAWN_SETSIGDEF flag.
scheduler: object = NULL
A tuple with the scheduler policy (optional) and parameters.
Execute the program specified by path in a new process.
[clinic start generated code]*/
@ -5427,7 +5428,7 @@ os_posix_spawn_impl(PyObject *module, path_t *path, PyObject *argv,
PyObject *env, PyObject *file_actions,
PyObject *setpgroup, int resetids, PyObject *setsigmask,
PyObject *setsigdef, PyObject *scheduler)
/*[clinic end generated code: output=45dfa4c515d09f2c input=2d7a7578430a90f0]*/
/*[clinic end generated code: output=45dfa4c515d09f2c input=2891c2f1d457e39b]*/
{
EXECV_CHAR **argvlist = NULL;
EXECV_CHAR **envlist = NULL;
@ -5477,7 +5478,7 @@ os_posix_spawn_impl(PyObject *module, path_t *path, PyObject *argv,
goto exit;
}
if (file_actions != Py_None) {
if (file_actions != NULL) {
/* There is a bug in old versions of glibc that makes some of the
* helper functions for manipulating file actions not copy the provided
* buffers. The problem is that posix_spawn_file_actions_addopen does not