Merge from origin/emacs-29

a74e51cfd15 Fix a defcustom :type
c27b90d04bf Fix 'ido--ffap-find-file'
1594d5f17ad Fix setting the pipe capacity for subprocesses
aad8b5d78f3 Handle LANG on macOS differently (bug#65908)

# Conflicts:
#	src/process.c

1 files changed, 9 insertions, 4 deletions

diff --git a/src/process.c b/src/process.c
index 2376d0f288d..e885f771139 100644
--- a/src/process.c
+++ b/src/process.c
@@ -2206,10 +2206,15 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
       inchannel = p->open_fd[READ_FROM_SUBPROCESS];
       forkout = p->open_fd[SUBPROCESS_STDOUT];
 
-#if (defined (GNU_LINUX) || defined __ANDROID__)        \
-  && defined (F_SETPIPE_SZ)
-      fcntl (inchannel, F_SETPIPE_SZ, read_process_output_max);
-#endif /* (GNU_LINUX || __ANDROID__) && F_SETPIPE_SZ */
+#if defined(F_SETPIPE_SZ) && defined(F_GETPIPE_SZ)
+      /* If they requested larger reads than the default system pipe
+         capacity, try enlarging the capacity to match the request.  */
+      if (read_process_output_max > fcntl (inchannel, F_GETPIPE_SZ))
+        {
+          int readmax = clip_to_bounds (1, read_process_output_max, INT_MAX);
+          fcntl (inchannel, F_SETPIPE_SZ, readmax);
+        }
+#endif
     }
 
   if (!NILP (p->stderrproc))