Fix #1276: [AIX] use getargs to get process cmdline (#1500) (patch by …

…@wiggin15)

psutil/_psaix.py

@@ -358,20 +358,13 @@ def __init__(self, pid):
         self._procfs_path = get_procfs_path()
 
     def oneshot_enter(self):
-        self._proc_name_and_args.cache_activate(self)
         self._proc_basic_info.cache_activate(self)
         self._proc_cred.cache_activate(self)
 
     def oneshot_exit(self):
-        self._proc_name_and_args.cache_deactivate(self)
         self._proc_basic_info.cache_deactivate(self)
         self._proc_cred.cache_deactivate(self)
 
-    @wrap_exceptions
-    @memoize_when_activated
-    def _proc_name_and_args(self):
-        return cext.proc_name_and_args(self.pid, self._procfs_path)
-
     @wrap_exceptions
     @memoize_when_activated
     def _proc_basic_info(self):
@@ -386,14 +379,17 @@ def _proc_cred(self):
     def name(self):
         if self.pid == 0:
             return "swapper"
-        # note: this is limited to 15 characters
-        return self._proc_name_and_args()[0].rstrip("\x00")
+        # note: max 16 characters
+        return cext.proc_name(self.pid, self._procfs_path).rstrip("\x00")
 
     @wrap_exceptions
     def exe(self):
         # there is no way to get executable path in AIX other than to guess,
         # and guessing is more complex than what's in the wrapping class
-        exe = self.cmdline()[0]
+        cmdline = self.cmdline()
+        if not cmdline:
+            return ''
+        exe = cmdline[0]
         if os.path.sep in exe:
             # relative or absolute path
             if not os.path.isabs(exe):
@@ -415,7 +411,7 @@ def exe(self):
 
     @wrap_exceptions
     def cmdline(self):
-        return self._proc_name_and_args()[1].split(' ')
+        return cext.proc_args(self.pid)
 
     @wrap_exceptions
     def create_time(self):

psutil/_psutil_aix.c

@@ -23,20 +23,21 @@
  *
  * Useful resources:
  * - proc filesystem: http://www-01.ibm.com/support/knowledgecenter/
- *       ssw_aix_61/com.ibm.aix.files/proc.htm
+ *       ssw_aix_72/com.ibm.aix.files/proc.htm
  * - libperfstat: http://www-01.ibm.com/support/knowledgecenter/
- *       ssw_aix_61/com.ibm.aix.files/libperfstat.h.htm
+ *       ssw_aix_72/com.ibm.aix.files/libperfstat.h.htm
  */
 
 #include <Python.h>
 
-#include <sys/types.h>
-#include <sys/stat.h>
+#include <sys/limits.h>
 #include <sys/proc.h>
-#include <sys/sysinfo.h>
 #include <sys/procfs.h>
 #include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/sysinfo.h>
 #include <sys/thread.h>
+#include <sys/types.h>
 #include <fcntl.h>
 #include <utmp.h>
 #include <utmpx.h>
@@ -134,41 +135,80 @@ psutil_proc_basic_info(PyObject *self, PyObject *args) {
 
 
 /*
- * Return process name and args as a Python tuple.
+ * Return process name as a Python string.
  */
 static PyObject *
-psutil_proc_name_and_args(PyObject *self, PyObject *args) {
+psutil_proc_name(PyObject *self, PyObject *args) {
     int pid;
     char path[100];
     psinfo_t info;
     const char *procfs_path;
-    PyObject *py_name = NULL;
-    PyObject *py_args = NULL;
-    PyObject *py_retlist = NULL;
 
     if (! PyArg_ParseTuple(args, "is", &pid, &procfs_path))
         return NULL;
     sprintf(path, "%s/%i/psinfo", procfs_path, pid);
     if (! psutil_file_to_struct(path, (void *)&info, sizeof(info)))
         return NULL;
 
-    py_name = PyUnicode_DecodeFSDefault(info.pr_fname);
-    if (!py_name)
+    return PyUnicode_DecodeFSDefaultAndSize(info.pr_fname, PRFNSZ);
+}
+
+
+/*
+ * Return process command line arguments as a Python list
+ */
+static PyObject *
+psutil_proc_args(PyObject *self, PyObject *args) {
+    int pid;
+    PyObject *py_retlist = PyList_New(0);
+    PyObject *py_arg = NULL;
+    struct procsinfo procbuf;
+    long arg_max;
+    char *argbuf = NULL;
+    char *curarg = NULL;
+    int ret;
+
+    if (py_retlist == NULL)
+        return NULL;
+    if (!PyArg_ParseTuple(args, "i", &pid))
         goto error;
-    py_args = PyUnicode_DecodeFSDefault(info.pr_psargs);
-    if (!py_args)
+    arg_max = sysconf(_SC_ARG_MAX);
+    argbuf = malloc(arg_max);
+    if (argbuf == NULL) {
+        PyErr_NoMemory();
         goto error;
-    py_retlist = Py_BuildValue("OO", py_name, py_args);
-    if (!py_retlist)
+    }
+
+    procbuf.pi_pid = pid;
+    ret = getargs(&procbuf, sizeof(struct procinfo), argbuf, ARG_MAX);
+    if (ret == -1) {
+        PyErr_SetFromErrno(PyExc_OSError);
         goto error;
-    Py_DECREF(py_name);
-    Py_DECREF(py_args);
+    }
+
+    curarg = argbuf;
+    /* getargs will always append an extra NULL to end the arg list,
+     * even if the buffer is not big enough (even though it is supposed
+     * to be) so the following 'while' is safe */
+    while (*curarg != '\0') {
+        py_arg = PyUnicode_DecodeFSDefault(curarg);
+        if (!py_arg)
+            goto error;
+        if (PyList_Append(py_retlist, py_arg))
+            goto error;
+        Py_DECREF(py_arg);
+        curarg = strchr(curarg, '\0') + 1;
+    }
+
+    free(argbuf);
+
     return py_retlist;
 
 error:
-    Py_XDECREF(py_name);
-    Py_XDECREF(py_args);
+    if (argbuf != NULL)
+        free(argbuf);
     Py_XDECREF(py_retlist);
+    Py_XDECREF(py_arg);
     return NULL;
 }
 
@@ -880,8 +920,10 @@ PsutilMethods[] =
     // --- process-related functions
     {"proc_basic_info", psutil_proc_basic_info, METH_VARARGS,
      "Return process ppid, rss, vms, ctime, nice, nthreads, status and tty"},
-    {"proc_name_and_args", psutil_proc_name_and_args, METH_VARARGS,
-     "Return process name and args."},
+    {"proc_name", psutil_proc_name, METH_VARARGS,
+     "Return process name."},
+    {"proc_args", psutil_proc_args, METH_VARARGS,
+     "Return process command line arguments."},
     {"proc_cpu_times", psutil_proc_cpu_times, METH_VARARGS,
      "Return process user and system CPU times."},
     {"proc_cred", psutil_proc_cred, METH_VARARGS,

psutil/tests/test_process.py

@@ -724,12 +724,28 @@ def test_cmdline(self):
             else:
                 raise
 
+    def test_long_cmdline(self):
+        create_exe(TESTFN)
+        self.addCleanup(safe_rmpath, TESTFN)
+        cmdline = [TESTFN] + (["0123456789"] * 20)
+        sproc = get_test_subprocess(cmdline)
+        p = psutil.Process(sproc.pid)
+        self.assertEqual(p.cmdline(), cmdline)
+
     def test_name(self):
         sproc = get_test_subprocess(PYTHON_EXE)
         name = psutil.Process(sproc.pid).name().lower()
         pyexe = os.path.basename(os.path.realpath(sys.executable)).lower()
         assert pyexe.startswith(name), (pyexe, name)
 
+    def test_long_name(self):
+        long_name = TESTFN + ("0123456789" * 2)
+        create_exe(long_name)
+        self.addCleanup(safe_rmpath, long_name)
+        sproc = get_test_subprocess(long_name)
+        p = psutil.Process(sproc.pid)
+        self.assertEqual(p.name(), os.path.basename(long_name))
+
     # XXX
     @unittest.skipIf(SUNOS, "broken on SUNOS")
     @unittest.skipIf(AIX, "broken on AIX")