X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/33ab7ee0edcb3608e4a3d5deebc2b72c180dbfe4..eb0f65b4fbbea60100b53cb40a1d7138d47ad0d2:/lib/getdtablesize.c

diff --git a/lib/getdtablesize.c b/lib/getdtablesize.c
index 59b97360bc..03eb7ef1bf 100644
--- a/lib/getdtablesize.c
+++ b/lib/getdtablesize.c
@@ -84,32 +84,38 @@ getdtablesize (void)
   return dtablesize;
 }
 
-#elif HAVE_GETDTABLESIZE
+#else
 
+# include <limits.h>
 # include <sys/resource.h>
-# undef getdtablesize
 
-int
-rpl_getdtablesize(void)
-{
-  /* To date, this replacement is only compiled for Cygwin 1.7.25,
-     which auto-increased the RLIMIT_NOFILE soft limit until it
-     hits the compile-time constant hard limit of 3200.  Although
-     that version of cygwin supported a child process inheriting
-     a smaller soft limit, the smaller limit is not enforced, so
-     we might as well just report the hard limit.  */
-  struct rlimit lim;
-  if (!getrlimit (RLIMIT_NOFILE, &lim) && lim.rlim_max != RLIM_INFINITY)
-    return lim.rlim_max;
-  return getdtablesize ();
-}
+# ifndef RLIM_SAVED_CUR
+#  define RLIM_SAVED_CUR RLIM_INFINITY
+# endif
+# ifndef RLIM_SAVED_MAX
+#  define RLIM_SAVED_MAX RLIM_INFINITY
+# endif
 
-#elif defined _SC_OPEN_MAX
+# ifdef __CYGWIN__
+  /* Cygwin 1.7.25 auto-increases the RLIMIT_NOFILE soft limit until it
+     hits the compile-time constant hard limit of 3200.  We might as
+     well just report the hard limit.  */
+#  define rlim_cur rlim_max
+# endif
 
 int
 getdtablesize (void)
 {
-  return sysconf (_SC_OPEN_MAX);
+  struct rlimit lim;
+
+  if (getrlimit (RLIMIT_NOFILE, &lim) == 0
+      && 0 <= lim.rlim_cur && lim.rlim_cur <= INT_MAX
+      && lim.rlim_cur != RLIM_INFINITY
+      && lim.rlim_cur != RLIM_SAVED_CUR
+      && lim.rlim_cur != RLIM_SAVED_MAX)
+    return lim.rlim_cur;
+
+  return INT_MAX;
 }
 
 #endif