From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 24 Nov 2022 11:59:22 +0100
Subject: [PATCH] configure.ac: C99 fixes for poll_works check

Include <fcntl.h> if it is available for the open prototype.
Return from main instead of calling exit, so that no function
declaration is needed.

---
 erts/configure    | 4 ++--
 erts/configure.ac | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/erts/configure b/erts/configure
index 136b7eb..eb621ff 100755
--- a/erts/configure
+++ b/erts/configure
@@ -24908,9 +24908,9 @@ int main()
   fds[0].events = POLLIN;
   fds[0].revents = 0;
   if (poll(fds, 1, 0) < 0 || (fds[0].revents & POLLNVAL) != 0) {
-    exit(1);  /* Does not work for devices -- fail */
+    return 1;  /* Does not work for devices -- fail */
   }
-  exit(0);
+  return 0;
 #endif
 }
 
diff --git a/erts/configure.ac b/erts/configure.ac
index a0769f0..5869b3c 100644
--- a/erts/configure.ac
+++ b/erts/configure.ac
@@ -3117,9 +3117,9 @@ int main()
   fds[0].events = POLLIN;
   fds[0].revents = 0;
   if (poll(fds, 1, 0) < 0 || (fds[0].revents & POLLNVAL) != 0) {
-    exit(1);  /* Does not work for devices -- fail */
+    return 1;  /* Does not work for devices -- fail */
   }
-  exit(0);
+  return 0;
 #endif
 }
 ]])],[poll_works=yes],[poll_works=no],[
-- 
2.43.5