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+?RCS: $Id: d_closefrom.U 167 2013-05-08 17:58:00Z rmanfredi $
+?RCS: Copyright (c) 2006, Christian Biere
+?RCS: You may redistribute only under the terms of the Artistic License,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic License; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?MAKE:d_closefrom: Trylink cat i_unistd
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_CLOSEFROM symbol, which
+?S: indicates to the C program that closefrom() support is available.
+?C: This symbol is defined when closefrom() can be used.
+?H:#$d_closefrom HAS_CLOSEFROM
+?LINT: set d_closefrom
+: can we use closefrom?
+$cat >try.c <<EOC
+#include <sys/types.h>
+#include <stdlib.h>
+#$i_unistd I_UNISTD
+#ifdef I_UNISTD
+#include <unistd.h>
+int main(void)
+ static const int fd = 1;
+ /*
+ * On Solaris it returns nothing
+ * On NetBSD it's equivalent to fcntl(fd, F_CLOSEM)
+ */
+ closefrom(fd);
+ return 0;
+set d_closefrom
+eval $trylink