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| >Video for Linux Two API Specification: Revision 0.24</TH |
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| >ioctl VIDIOC_LOG_STATUS</H1 |
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| NAME="AEN12788" |
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| ><H2 |
| >Name</H2 |
| >VIDIOC_LOG_STATUS -- Log driver status information</DIV |
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| >Synopsis</H2 |
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| ><CODE |
| ><CODE |
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| >int ioctl</CODE |
| >(int fd, int request);</CODE |
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| >Description</H2 |
| ><P |
| >As the video/audio devices become more complicated it |
| becomes harder to debug problems. When this ioctl is called the driver |
| will output the current device status to the kernel log. This is |
| particular useful when dealing with problems like no sound, no video |
| and incorrectly tuned channels. Also many modern devices autodetect |
| video and audio standards and this ioctl will report what the device |
| thinks what the standard is. Mismatches may give an indication where |
| the problem is.</P |
| ><P |
| >This ioctl is optional and not all drivers support it. It |
| was introduced in Linux 2.6.15.</P |
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| >Return Value</H2 |
| ><P |
| >On success <SPAN |
| CLASS="RETURNVALUE" |
| >0</SPAN |
| > is returned, on error <SPAN |
| CLASS="RETURNVALUE" |
| >-1</SPAN |
| > and the <CODE |
| CLASS="VARNAME" |
| >errno</CODE |
| > variable is set appropriately:</P |
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| >EINVAL</SPAN |
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| >The driver does not support this ioctl.</P |
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