Move debugfs, rootfs and procfs documentation to README

rootfs_overlay/debugfs.sh

@@ -1,22 +1,13 @@
 #!/bin/sh
-set -ex
+set -e
 d=/debugfs
 mkdir -p "$d"
-# We also added a fstab entry that mounts this under /sys/kernel/debug autmoatically.
-# That is the most common place to mount it.
-# The /sys/kernel/debug directory gets created automatically when debugfs is
-# compiled into the kernel, but it does not get mounted automatically.
-mount -t debugfs none /debugfs
+mount -t debugfs none "$d"
 insmod /debugfs.ko
-cd "${d}/lkmc_debugfs"
-
-cat myfile
-# => 42
-
-echo 13 > myfile
-cat myfile
-# => 13
-
+[ "$(cat "${d}/lkmc_debugfs/myfile")" = 42 ]
+echo 13 > "${d}/lkmc_debugfs/myfile"
+[ "$(cat "${d}/lkmc_debugfs/myfile")" = 13 ]
 echo 666 > "${d}/lkmc_debugfs_file"
-cat myfile
-# => 666
+[ "$(cat "${d}/lkmc_debugfs/myfile")" = 666 ]
+rmmod debugfs
+umount "$d"

rootfs_overlay/procfs.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -e
+insmod /procfs.ko
+[ "$(cat "/proc/lkmc_procfs")" = abcd ]
+rmmod procfs

rootfs_overlay/sysfs.sh

@@ -1,11 +1,11 @@
 #!/bin/sh
-
-set -x
+set -e
 insmod /sysfs.ko
-cd /sys/kernel/lkmc_sysfs
-printf 12345 >foo
-cat foo
-# => 1234
-dd if=foo bs=1 count=2 skip=1 status=none
-# => 23
+f=/sys/kernel/lkmc_sysfs/foo
+# write
+printf 12345 > "$f"
+# read
+[ "$(cat "$f")" = 1234 ]
+# seek
+[ "$(dd if="$f" bs=1 count=2 skip=1 status=none)" = 23 ]
 rmmod sysfs

rootfs_overlay/test_all.sh

@@ -1,14 +1,15 @@
 #!/bin/sh
-(
-  set -ex
-  /character_device.sh
-  /character_device_create.sh
-  /fops.sh
-)
-if [ "$?" -eq 0 ]; then
-  echo lkmc_test_pass
-  exit 0
-else
-  echo lkmc_test_fail
-  exit 1
-fi
+for test in \
+  /character_device.sh \
+  /character_device_create.sh \
+  /debugfs.sh \
+  /fops.sh \
+  /procfs.sh \
+  /sysfs.sh
+do
+  if ! "$test"; then
+    echo "lkmc_test_fail: ${test}"
+    exit 1
+  fi
+done
+echo lkmc_test_pass