[OpenBSD] Process num_fds() and open_files() may raise NSP for PID 0

HISTORY.rst

@@ -25,6 +25,9 @@ XXXX-XX-XX
   Python 3.13.  (patch by Sam Gross)
 - 2455_, [Linux]: ``IndexError`` may occur when reading /proc/pid/stat and
   field 40 (blkio_ticks) is missing.
+- 2460_, [OpenBSD]: `Process.num_fds()`_ and `Process.open_files()`_ may fail
+  with `NoSuchProcess`_ for PID 0. Instead, we now return "null" values (0 and
+  [] respectively).
 
 6.0.0
 ======

INSTALL.rst

@@ -82,7 +82,7 @@ OpenBSD
 
 ::
 
-    export PKG_PATH=http://ftp.eu.openbsd.org/pub/OpenBSD/`uname -r`/packages/`uname -m`/
+    export PKG_PATH=https://cdn.openbsd.org/pub/OpenBSD/`uname -r`/packages/`uname -m`/
     pkg_add -v python3 gcc
     pip install psutil
 
@@ -93,7 +93,7 @@ Assuming Python 3.11 (the most recent at the time of writing):
 
 ::
 
-    export PKG_PATH="http://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/`uname -m`/`uname -r`/All"
+    export PKG_PATH="https://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/`uname -m`/`uname -r`/All"
     pkg_add -v pkgin
     pkgin install python311-* gcc12-* py311-setuptools-* py311-pip-*
     python3.11 -m pip install psutil

psutil/arch/bsd/proc.c

@@ -442,8 +442,17 @@ psutil_proc_open_files(PyObject *self, PyObject *args) {
 
     errno = 0;
     freep = kinfo_getfile(pid, &cnt);
+
     if (freep == NULL) {
-#if !defined(PSUTIL_OPENBSD)
+#if defined(PSUTIL_OPENBSD)
+        if ((pid == 0) && (errno == ESRCH)) {
+            psutil_debug(
+                "open_files() returned ESRCH for PID 0; forcing `return []`"
+            );
+            PyErr_Clear();
+            return py_retlist;
+        }
+#else
         psutil_raise_for_pid(pid, "kinfo_getfile()");
 #endif
         goto error;

psutil/arch/openbsd/proc.c

@@ -41,7 +41,7 @@ psutil_kinfo_proc(pid_t pid, struct kinfo_proc *proc) {
 
     ret = sysctl((int*)mib, 6, proc, &size, NULL, 0);
     if (ret == -1) {
-        PyErr_SetFromErrno(PyExc_OSError);
+        psutil_PyErr_SetFromOSErrnoWithSyscall("sysctl(kinfo_proc)");
         return -1;
     }
     // sysctl stores 0 in the size if we can't find the process information.
@@ -69,7 +69,7 @@ kinfo_getfile(pid_t pid, int* cnt) {
 
     /* get the size of what would be returned */
     if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
-        PyErr_SetFromErrno(PyExc_OSError);
+        psutil_PyErr_SetFromOSErrnoWithSyscall("sysctl(kinfo_file) (1/2)");
         return NULL;
     }
     if ((kf = malloc(len)) == NULL) {
@@ -79,7 +79,7 @@ kinfo_getfile(pid_t pid, int* cnt) {
     mib[5] = (int)(len / sizeof(struct kinfo_file));
     if (sysctl(mib, 6, kf, &len, NULL, 0) < 0) {
         free(kf);
-        PyErr_SetFromErrno(PyExc_OSError);
+        psutil_PyErr_SetFromOSErrnoWithSyscall("sysctl(kinfo_file) (2/2)");
         return NULL;
     }
 
@@ -288,8 +288,19 @@ psutil_proc_num_fds(PyObject *self, PyObject *args) {
         return NULL;
 
     freep = kinfo_getfile(pid, &cnt);
-    if (freep == NULL)
+
+    if (freep == NULL) {
+#if defined(PSUTIL_OPENBSD)
+        if ((pid == 0) && (errno == ESRCH)) {
+            psutil_debug(
+                "num_fds() returned ESRCH for PID 0; forcing `return 0`"
+            );
+            PyErr_Clear();
+            return Py_BuildValue("i", 0);
+        }
+#endif
         return NULL;
+    }
 
     free(freep);
     return Py_BuildValue("i", cnt);