POSIX:2024 specifies a small change in <sys/select.h>:
<https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_select.h.html>
2025-01-08 Bruno Haible <br...@clisp.org>
sys_select-h: Update for POSIX:2024.
* lib/sys_select.in.h (rpl_fd_isset): Change type of second parameter to
'const fd_set *'.
* tests/test-sys_select-h.c: Check for some more types and for
FD_SETSIZE.
(FD_ISSET): Expect type of second parameter to be 'const fd_set *'.
diff --git a/lib/sys_select.in.h b/lib/sys_select.in.h
index fd3e28fd8e..f55687b571 100644
--- a/lib/sys_select.in.h
+++ b/lib/sys_select.in.h
@@ -170,7 +170,7 @@
/* Re-define FD_ISSET to avoid a WSA call while we are not using
network sockets. */
static int
-rpl_fd_isset (SOCKET fd, fd_set * set)
+rpl_fd_isset (SOCKET fd, const fd_set * set)
{
u_int i;
if (set == NULL)
diff --git a/tests/test-sys_select-h.c b/tests/test-sys_select-h.c
index 2d70fcb0e3..08aa83e000 100644
--- a/tests/test-sys_select-h.c
+++ b/tests/test-sys_select-h.c
@@ -18,6 +18,7 @@
#include <config.h>
+/* Specification. */
#include <sys/select.h>
/* Check that the 'struct timeval' type is defined. */
@@ -30,6 +31,21 @@ typedef int verify_tv_sec_type[sizeof (time_t) <= sizeof
(a.tv_sec) ? 1 : -1];
/* Check that sigset_t is defined. */
sigset_t t2;
+/* Check that time_t, suseconds_t are defined. */
+time_t t3;
+suseconds_t t4;
+
+/* Check that the 'struct timespec' type is defined. */
+struct timespec t5;
+
+/* Check that the 'fd_set' type is defined. */
+fd_set t6;
+
+/* Check that FD_SETSIZE is defined. */
+#if !FD_SETSIZE
+# error "FD_SETSIZE not positive"
+#endif
+
#include "signature.h"
/* The following may be macros without underlying functions, so only
@@ -38,7 +54,7 @@ sigset_t t2;
SIGNATURE_CHECK (FD_CLR, void, (int, fd_set *));
#endif
#ifndef FD_ISSET
-SIGNATURE_CHECK (FD_ISSET, void, (int, fd_set *));
+SIGNATURE_CHECK (FD_ISSET, void, (int, const fd_set *));
#endif
#ifndef FD_SET
SIGNATURE_CHECK (FD_SET, int, (int, fd_set *));
