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bpo-33625: Release GIL for grp.getgr{nam,gid} and pwd.getpw{nam,uid} (GH-7081)

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Release GIL on grp.getgrnam(), grp.getgrgid(), pwd.getpwnam() and
pwd.getpwuid() if reentrant variants of these functions are available.

Patch by William Grzybowski.
This commit is contained in:
William Grzybowski 2018-09-07 09:06:15 -03:00 • committed by Victor Stinner
parent 25fa141487
commit 23e65b2555
6 changed files with 228 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

104
Modules/pwdmodule.c
View file

@ -50,6 +50,8 @@ exception is raised if the entry asked for cannot be found.");
static int initialized;
static PyTypeObject StructPwdType;
#define DEFAULT_BUFFER_SIZE 1024
static void
sets(PyObject *v, int i, const char* val)
{
@ -116,8 +118,11 @@ static PyObject *
pwd_getpwuid(PyObject *module, PyObject *uidobj)
/*[clinic end generated code: output=c4ee1d4d429b86c4 input=ae64d507a1c6d3e8]*/
{
PyObject *retval = NULL;
uid_t uid;
int nomem = 0;
struct passwd *p;
char *buf = NULL, *buf2 = NULL;
if (!_Py_Uid_Converter(uidobj, &uid)) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
@ -125,7 +130,47 @@ pwd_getpwuid(PyObject *module, PyObject *uidobj)
"getpwuid(): uid not found");
return NULL;
}
if ((p = getpwuid(uid)) == NULL) {
#ifdef HAVE_GETPWUID_R
Py_BEGIN_ALLOW_THREADS
int status;
Py_ssize_t bufsize;
struct passwd pwd;
bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
if (bufsize == -1) {
bufsize = DEFAULT_BUFFER_SIZE;
}
while(1) {
buf2 = PyMem_RawRealloc(buf, bufsize);
if (buf2 == NULL) {
nomem = 1;
break;
}
buf = buf2;
status = getpwuid_r(uid, &pwd, buf, bufsize, &p);
if (status != 0) {
p = NULL;
}
if (p != NULL || status != ERANGE) {
break;
}
if (bufsize > (PY_SSIZE_T_MAX >> 1)) {
nomem = 1;
break;
}
bufsize <<= 1;
}
Py_END_ALLOW_THREADS
#else
p = getpwuid(uid);
#endif
if (p == NULL) {
PyMem_RawFree(buf);
if (nomem == 1) {
return PyErr_NoMemory();
}
PyObject *uid_obj = _PyLong_FromUid(uid);
if (uid_obj == NULL)
return NULL;
@ -134,7 +179,11 @@ pwd_getpwuid(PyObject *module, PyObject *uidobj)
Py_DECREF(uid_obj);
return NULL;
}
return mkpwent(p);
retval = mkpwent(p);
#ifdef HAVE_GETPWUID_R
PyMem_RawFree(buf);
#endif
return retval;
}
/*[clinic input]
@ -152,7 +201,8 @@ static PyObject *
pwd_getpwnam_impl(PyObject *module, PyObject *arg)
/*[clinic end generated code: output=6abeee92430e43d2 input=d5f7e700919b02d3]*/
{
char *name;
char *buf = NULL, *buf2 = NULL, *name;
int nomem = 0;
struct passwd *p;
PyObject *bytes, *retval = NULL;
@ -161,13 +211,55 @@ pwd_getpwnam_impl(PyObject *module, PyObject *arg)
/* check for embedded null bytes */
if (PyBytes_AsStringAndSize(bytes, &name, NULL) == -1)
goto out;
if ((p = getpwnam(name)) == NULL) {
PyErr_Format(PyExc_KeyError,
"getpwnam(): name not found: %s", name);
#ifdef HAVE_GETPWNAM_R
Py_BEGIN_ALLOW_THREADS
int status;
Py_ssize_t bufsize;
struct passwd pwd;
bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
if (bufsize == -1) {
bufsize = DEFAULT_BUFFER_SIZE;
}
while(1) {
buf2 = PyMem_RawRealloc(buf, bufsize);
if (buf2 == NULL) {
nomem = 1;
break;
}
buf = buf2;
status = getpwnam_r(name, &pwd, buf, bufsize, &p);
if (status != 0) {
p = NULL;
}
if (p != NULL || status != ERANGE) {
break;
}
if (bufsize > (PY_SSIZE_T_MAX >> 1)) {
nomem = 1;
break;
}
bufsize <<= 1;
}
Py_END_ALLOW_THREADS
#else
p = getpwnam(name);
#endif
if (p == NULL) {
if (nomem == 1) {
PyErr_NoMemory();
}
else {
PyErr_Format(PyExc_KeyError,
"getpwnam(): name not found: %s", name);
}
goto out;
}
retval = mkpwent(p);
out:
PyMem_RawFree(buf);
Py_DECREF(bytes);
return retval;
}