tests: refactor more tests to use mkfifo_or_skip_

* tests/cp/existing-perm-race: s/mkfifo/mkfifo_or_skip_/
* tests/cp/file-perm-race: Likewise.
* tests/cp/parent-perm-race: Likewise.
* tests/cp/special-f: Likewise.
* tests/dd/reblock: Likewise.
* tests/ls/file-type: Likewise.
* tests/misc/cat-buf: Likewise.
* tests/misc/mknod: Likewise.
* tests/misc/printf-surprise: Likewise.
* tests/misc/selinux: Likewise.
* tests/misc/sort-spinlock-abuse: Likewise.
* tests/misc/stdbuf: Likewise.
* tests/misc/tac-continue: Likewise.
* tests/init.cfg: Improve the error message when skipping.

tests/misc/cat-buf

@@ -24,7 +24,7 @@ print_ver_ cat
 # consumer (dd) opens the fifo therefore increasing
 # the chance that dd will read the data from each
 # write separately.
-mkfifo fifo || framework_failure
+mkfifo_or_skip_ fifo
 
 
 echo 1 > exp

tests/misc/mknod

@@ -19,6 +19,8 @@
 . "${srcdir=.}/init.sh"; path_prepend_ ../src
 print_ver_ mknod
 
+# Ensure fifos are supported
+mkfifo_or_skip_ fifo
 
 umask 777
 

tests/misc/printf-surprise

@@ -48,7 +48,7 @@ require_ulimit_
 # and to make an N-byte-allocating-printf require more than that, thus
 # triggering the printf(3) misbehavior -- which, btw, is required by ISO C99.
 
-mkfifo fifo || framework_failure
+mkfifo_or_skip_ fifo
 
 # Disable MALLOC_PERTURB_, to avoid triggering this bug
 # http://bugs.debian.org/481543#77

tests/misc/selinux

@@ -26,7 +26,7 @@ skip_if_mcstransd_is_running_
 # Create a regular file, dir, fifo.
 touch f || framework_failure
 mkdir d s1 s2 || framework_failure
-mkfifo p || framework_failure
+mkfifo_or_skip_ p
 
 
 # special context that works both with and without mcstransd

tests/misc/sort-spinlock-abuse

@@ -24,7 +24,7 @@ grep '^#define HAVE_PTHREAD_T 1' "$CONFIG_HEADER" > /dev/null ||
   skip_test_ 'requires pthreads'
 
 seq 100000 > in || framework_failure_
-mkfifo fifo || framework_failure_
+mkfifo_or_skip_ fifo
 
 # Arrange for sort to require 5.0+ seconds of wall-clock time,
 # while actually using far less than 1 second of CPU time.

tests/misc/stdbuf

@@ -36,7 +36,7 @@ esac
 # consumer (dd) opens the fifo therefore increasing
 # the chance that dd will read the data from each
 # write separately.
-mkfifo fifo || framework_failure
+mkfifo_or_skip_ fifo
 
 
 # Verify input parameter checking

tests/misc/tac-continue

@@ -53,7 +53,7 @@ seq 5 > in
 
 # Give tac a fifo command line argument.
 # This makes it try to create a temporary file in $TMPDIR.
-mkfifo fifo
+mkfifo_or_skip fifo
 seq 1000 > fifo &
 TMPDIR=$FULL_PARTITION_TMPDIR tac fifo in >out 2>err && fail=1