[3.15] gh-156060: Do not scan every process four times in `remote_debugging.get_child_pids()` on macOS (GH-156061) (#156069)

https://github.com/python/cpython/commit/47724d8edfd1e9aaa1872a563729665f50d02ac3
commit: 47724d8edfd1e9aaa1872a563729665f50d02ac3
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: pablogsal <[email protected]>
date: 2026-08-19T22:49:32+01:00
summary:

[3.15] gh-156060: Do not scan every process four times in `remote_debugging.get_child_pids()` on macOS (GH-156061) (#156069)

files:
M Modules/_remote_debugging/subprocess.c

diff --git a/Modules/_remote_debugging/subprocess.c b/Modules/_remote_debugging/subprocess.c
index cdad75e318be914..056cc6773a88b44 100644
--- a/Modules/_remote_debugging/subprocess.c
+++ b/Modules/_remote_debugging/subprocess.c
@@ -307,6 +307,7 @@ get_child_pids_platform(pid_t target_pid, int recursive, pid_array_t *result)
         PyErr_SetString(PyExc_OSError, "Failed to get process count");
         goto done;
     }
+    n_pids /= sizeof(pid_t);
 
     /* Allocate buffer for PIDs (add some slack for new processes) */
     int buffer_size = n_pids + 64;
@@ -322,6 +323,7 @@ get_child_pids_platform(pid_t target_pid, int recursive, pid_array_t *result)
         PyErr_SetString(PyExc_OSError, "Failed to list PIDs");
         goto done;
     }
+    actual /= sizeof(pid_t);
 
     /* Build pid -> ppid mapping */
     ppids = (pid_t *)PyMem_Malloc(actual * sizeof(pid_t));

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