master: unix-fast-select: allow select on FD_SETSIZE - 1

The branch "master" has been updated in SBCL:
       via  db9ae74c6755f8aca827ebc61ae03ba6c364b5e5 (commit)
      from  b2dc86b47a1023856188d24c2c6e7cfe0eb12fac (commit)

- Log -----------------------------------------------------------------
commit db9ae74c6755f8aca827ebc61ae03ba6c364b5e5
Author: Stas Boukarev <[email protected]>
Date:   Wed Apr 15 17:51:54 2026 +0300

    unix-fast-select: allow select on FD_SETSIZE - 1
---
 src/code/unix.lisp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/code/unix.lisp b/src/code/unix.lisp
index 06fc530b0..10f9946ef 100644
--- a/src/code/unix.lisp
+++ b/src/code/unix.lisp
@@ -674,11 +674,11 @@ avoiding atexit(3) hooks, etc. Otherwise exit(2) is called."
 ;;;; sys/select.h
 
 (defmacro with-fd-setsize ((n) &body body)
-  `(let ((,n (if (< 0 ,n fd-setsize)
+  `(let ((,n (if (<= -1 ,n fd-setsize)
                  ,n
                  (error "Cannot select(2) on ~D: above FD_SETSIZE limit."
                         (1- ,n)))))
-     (declare (type (integer 0 #.fd-setsize) ,n))
+     (declare (type (integer 0 ,fd-setsize) ,n))
      ,@body))
 
 ;;; Perform the UNIX select(2) system call.

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