--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2009-01-19  Bruno Haible  <bruno@clisp.org>
+
+	* tests/test-link.c: Include <errno.h>.
+	(main): Exit with code 77 when a hard link cannot be created due to
+	the file system.
+	* tests/test-link.sh: Skip test when a hard link cannot be created due
+	to the file system.
+	Suggested by Eric Blake.
+
 2009-01-19  Martin Lambers  <marlam@marlam.de>
 
 	* modules/link-tests: New file.

--- a/tests/test-link.c
+++ b/tests/test-link.c
@@ -18,6 +18,7 @@
 
 #include <unistd.h>
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -36,8 +37,20 @@
 int
 main (int argc, char **argv)
 {
+  int ret;
+
   ASSERT (argc == 3);
-  ASSERT (link (argv[1], argv[2]) == 0);
+
+  ret = link (argv[1], argv[2]);
+  if (ret < 0)
+    {
+      /* If the device does not support hard links, errno is
+	 EPERM on Linux, EOPNOTSUPP on FreeBSD.  */
+      if (errno == EPERM || errno == EOPNOTSUPP)
+	return 77;
+      perror ("link");
+      return 1;
+    }
 
   return 0;
 }

--- a/tests/test-link.sh
+++ b/tests/test-link.sh
@@ -7,7 +7,16 @@
 echo "hello" > test-link-a.txt || exit 1
 
 # Use link() to create a new name for it.
-./test-link${EXEEXT} test-link-a.txt test-link-b.txt || exit 1
+./test-link${EXEEXT} test-link-a.txt test-link-b.txt
+case $? in
+  0) ;;
+  77)
+    echo "Skipping test: hard links are not supported on this file system"
+    rm -fr $tmpfiles
+    exit 77
+    ;;
+  *) exit 1 ;;
+esac
 cmp test-link-a.txt test-link-b.txt || exit 1
 
 # Modify the contents of the first file.