[PATCH] getdtablesize: support systems without getrlimit like WASI

[Yuta Saito]

* lib/getdtablesize.c (getdtablesize): Return INT_MAX if getrlimit
  is not available. This is the case for WASI, WebAssembly System
  Interface.
* m4/getdtablesize.m4 (gl_PREREQ_GETDTABLESIZE): Check for getrlimit.
---
 ChangeLog           | 8 ++++++++
 lib/getdtablesize.c | 2 ++
 m4/getdtablesize.m4 | 6 ++++--
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 96b29b7fc4..1ef678a316 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2024-05-04 Yuta Saito <kateinoigakukun@gmail.com>
+
+       getdtablesize: support systems without getrlimit like WASI
+       * lib/getdtablesize.c (getdtablesize): Return INT_MAX if getrlimit
+       is not available. This is the case for WASI, WebAssembly System
+       Interface.
+       * m4/getdtablesize.m4 (gl_PREREQ_GETDTABLESIZE): Check for getrlimit.
+
 2024-05-03  Collin Funk  <collin.funk1@gmail.com>
 
        gnulib-tool.py: Fix an undefined function name.
diff --git a/lib/getdtablesize.c b/lib/getdtablesize.c
index 762c100b38..fca937a39a 100644
--- a/lib/getdtablesize.c
+++ b/lib/getdtablesize.c
@@ -109,6 +109,7 @@ getdtablesize (void)
 int
 getdtablesize (void)
 {
+# if HAVE_GETRLIMIT
   struct rlimit lim;
 
   if (getrlimit (RLIMIT_NOFILE, &lim) == 0
@@ -117,6 +118,7 @@ getdtablesize (void)
       && lim.rlim_cur != RLIM_SAVED_CUR
       && lim.rlim_cur != RLIM_SAVED_MAX)
     return lim.rlim_cur;
+# endif
 
   return INT_MAX;
 }
diff --git a/m4/getdtablesize.m4 b/m4/getdtablesize.m4
index aaefe9b298..7059eb933e 100644
--- a/m4/getdtablesize.m4
+++ b/m4/getdtablesize.m4
@@ -1,5 +1,5 @@
 # getdtablesize.m4
-# serial 8
+# serial 9
 dnl Copyright (C) 2008-2024 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -61,4 +61,6 @@ AC_DEFUN([gl_FUNC_GETDTABLESIZE],
 ])
 
 # Prerequisites of lib/getdtablesize.c.
-AC_DEFUN([gl_PREREQ_GETDTABLESIZE], [:])
+AC_DEFUN([gl_PREREQ_GETDTABLESIZE], [
+  AC_CHECK_FUNCS_ONCE([getrlimit])
+])
-- 
2.43.2