From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Fri, 21 Nov 2025 18:10:01 +0000 (+0200)
Subject: [3.13] gh-141659: Fix bad file descriptor error in subprocess on AIX (GH-141660)... 
X-Git-Tag: v3.13.10~53
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af94f62bf68508c0fa2c179660c7f484ad716a8b;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-141659: Fix bad file descriptor error in subprocess on AIX (GH-141660) (#141828)

Co-authored-by: Ayappan Perumal <ayappap2@in.ibm.com>
---

diff --git a/Misc/NEWS.d/next/Library/2025-11-17-08-16-30.gh-issue-141659.QNi9Aj.rst b/Misc/NEWS.d/next/Library/2025-11-17-08-16-30.gh-issue-141659.QNi9Aj.rst
new file mode 100644
index 000000000000..eeb055c6012a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-11-17-08-16-30.gh-issue-141659.QNi9Aj.rst
@@ -0,0 +1 @@
+Fix bad file descriptor errors from ``_posixsubprocess`` on AIX.
diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index b5326314677d..0a7ef74e26fa 100644
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -512,7 +512,13 @@ _close_open_fds_maybe_unsafe(int start_fd, int *fds_to_keep,
         proc_fd_dir = NULL;
     else
 #endif
+#if defined(_AIX)
+        char fd_path[PATH_MAX];
+        snprintf(fd_path, sizeof(fd_path), "/proc/%ld/fd", (long)getpid());
+        proc_fd_dir = opendir(fd_path);
+#else
         proc_fd_dir = opendir(FD_DIR);
+#endif
     if (!proc_fd_dir) {
         /* No way to get a list of open fds. */
         _close_range_except(start_fd, -1, fds_to_keep, fds_to_keep_len,