From a7a1846ab7fb049360b2c69486b7c673d09b8b28 Mon Sep 17 00:00:00 2001
From: Derrick Brashear <shadow@dementia.org>
Date: Tue, 21 Oct 2008 19:36:35 +0000
Subject: [PATCH] fd-setsize-test-20081021

LICENSE BSD

a test so we can deal with platforms which don't honor FD_SETSIZE
---
 src/cf/fdsetsize.m4 | 106 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/cf/fdsetsize.m4

diff --git a/src/cf/fdsetsize.m4 b/src/cf/fdsetsize.m4
new file mode 100644
index 0000000000..65a65eceec
--- /dev/null
+++ b/src/cf/fdsetsize.m4
@@ -0,0 +1,106 @@
+AC_DEFUN([FD_SET_OBEYS_FD_SETSIZE], [
+AC_MSG_CHECKING(for default FD_SETSIZE)
+AC_CACHE_VAL(ac_cv_default_fdsetsize,
+[
+AC_TRY_RUN(
+changequote(<<, >>)dnl
+<<
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+int main(int argc, char *argv[])
+{
+    FILE *fp;
+    int ac_cv_default_fdsetsize;
+#if defined(FD_SETSIZE)
+    ac_cv_default_fdsetsize = FD_SETSIZE;
+#else
+    ac_cv_default_fdsetsize = (sizeof(fd_set)*8);
+#endif
+    if ((fp = fopen("conftestval", "w")) == NULL)
+        exit(1);
+    fprintf(fp, "%d\n", ac_cv_default_fdsetsize);
+    fclose(fp);
+    exit(0);
+}
+>>
+changequote([, ])dnl
+,
+ac_cv_default_fdsetsize=`cat conftestval`,
+ac_cv_default_fdsetsize=-1,
+ac_cv_default_fdsetsize=1024
+)
+AC_MSG_RESULT([$ac_cv_default_fdsetsize])
+])
+
+AC_MSG_CHECKING(for default fd_set size)
+AC_CACHE_VAL(ac_cv_default_fd_set_size,
+[
+AC_TRY_RUN(
+changequote(<<, >>)dnl
+<<
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+int main(int argc, char *argv[])
+{
+    FILE *fp;
+    int ac_cv_default_fd_set_size;
+    ac_cv_default_fd_set_size = (sizeof(fd_set));
+
+    if ((fp = fopen("conftestval", "w")) == NULL)
+        exit(1);
+    fprintf(fp, "%d\n", ac_cv_default_fd_set_size);
+    fclose(fp);
+    exit(0);
+}
+>>
+changequote([, ])dnl
+,
+ac_cv_default_fd_set_size=`cat conftestval`,
+ac_cv_default_fd_set_size=-1,
+ac_cv_default_fd_set_size=128
+)
+AC_MSG_RESULT([$ac_cv_default_fd_set_size])
+])
+
+AC_MSG_CHECKING(for sizeof fd_set obeying FD_SETSIZE)
+AC_CACHE_VAL(ac_cv_fd_set_size_obeys,
+[
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CPPFLAGS -DORIG_FD_SETSIZE=$ac_cv_default_fdsetsize -DORIG_fd_set_size=$ac_cv_default_fd_set_size"
+AC_TRY_RUN([
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#if (ORIG_FD_SETSIZE < 2048) 
+#define FD_SETSIZE 2048
+#define __FD_SETSIZE 2048
+#else
+#define FD_SETSIZE 1024
+#define __FD_SETSIZE 1024
+#endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+int main() {
+    if ((ORIG_fd_set_size < 0) || (ORIG_FD_SETSIZE < 0))
+       exit(1);       
+    exit((sizeof(fd_set) == ORIG_fd_set_size) ? 1 : 0);
+}
+],
+ac_cv_fd_set_size_obeys=yes,
+ac_cv_fd_set_size_obeys=no,
+ac_cv_fd_set_size_obeys=yes)
+CPPFLAGS=$save_CPPFLAGS
+AC_MSG_RESULT([$ac_cv_fd_set_size_obeys])
+])
+
+])
+