WhyCan Forum(哇酷开发者社区)

buildroot$ find output/target/ |grep libstdc++ |xargs ls -l
lrwxrwxrwx 1 root root 19 Oct  9 10:33 output/target/usr/lib/libstdc++.so -> libstdc++.so.6.0.25
lrwxrwxrwx 1 root root 19 Oct  9 10:33 output/target/usr/lib/libstdc++.so.6 -> libstdc++.so.6.0.25
-rwxr-xr-x 1 root root 1042040 Oct  9 10:50 output/target/usr/lib/libstdc++.so.6.0.25
-rw-r--r-- 1 root  root 2466 Oct  9 10:33 output/target/usr/lib/libstdc++.so.6.0.25-gdb.py


buildroot$ sudo chroot output/target/ /bin/sh
/ # v4l2-ctl

General/Common options:
  --all              display all information available
  -C, --get-ctrl <ctrl>[,<ctrl>...]
                     get the value of the controls [VIDIOC_G_EXT_CTRLS]
  -c, --set-ctrl <ctrl>=<val>[,<ctrl>=<val>...]
                     set the value of the controls [VIDIOC_S_EXT_CTRLS]
  -D, --info         show driver info [VIDIOC_QUERYCAP]
  -d, --device <dev> use device <dev> instead of /dev/video0
                     if <dev> starts with a digit, then /dev/video<dev> is used
                     Otherwise if -z was specified earlier, then <dev> is the entity name
                     or interface ID (if prefixed with 0x) as found in the topology of the
                     media device with the bus info string as specified by the -z option.