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1 | To decode a hex IOCTL code: |
2 | |
3 | Most architectures use this generic format, but check |
4 | include/ARCH/ioctl.h for specifics, e.g. powerpc |
5 | uses 3 bits to encode read/write and 13 bits for size. |
6 | |
7 | bits meaning |
8 | 31-30 00 - no parameters: uses _IO macro |
9 | 10 - read: _IOR |
10 | 01 - write: _IOW |
11 | 11 - read/write: _IOWR |
12 | |
13 | 29-16 size of arguments |
14 | |
15 | 15-8 ascii character supposedly |
16 | unique to each driver |
17 | |
18 | 7-0 function # |
19 | |
20 | |
21 | So for example 0x82187201 is a read with arg length of 0x218, |
22 | character 'r' function 1. Grepping the source reveals this is: |
23 | |
24 | #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2]) |
25 |
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