common: Cope with AIX problem on number of open files.

* common/exechelp.c: Limit returned value for too hight values.
--

GnuPG-bug-id: 1778

(backport from master commit 987532b038)

Signed-off-by: Werner Koch <wk@gnupg.org>

common/exechelp.c

@@ -21,6 +21,9 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
 #include <string.h>
 #include <errno.h>
 #include <assert.h>
@@ -134,6 +137,13 @@ get_max_fds (void)
   if (max_fds == -1)
     max_fds = 256;  /* Arbitrary limit.  */
 
+  /* AIX returns INT32_MAX instead of a proper value.  We assume that
+     this is always an error and use an arbitrary limit.  */
+#ifdef INT32_MAX
+  if (max_fds == INT32_MAX)
+    max_fds = 256;
+#endif
+
   return max_fds;
 }