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# Updating Error Number Translations
To create an updated error number translation table, you can use the
`gen_errno` tool. This tool requires, as input:
* the illumos native `errno.h` file
* a set of foreign operating system `errno.h` files
The output is a set of translation table entries suitable for inclusion in a
cstyled C array. The index of the array is the native error number and the
value at each index is the translated error number for use with the foreign
operating system.
## Example
To generate a translation table for the LX Brand, you will require two files
from the current Linux source:
* `include/uapi/asm-generic/errno-base.h` (low-valued, or base, error numbers)
* `include/uapi/asm-generic/errno.h` (extended error numbers)
Assuming the files are in the current directory, you should run the tool as
follows:
$ dmake
...
$ ./gen_errno -F errno-base.h -F errno.h \
-N $SRC/uts/common/sys/errno.h
0, /* 0: No Error */
1, /* 1: EPERM --> 1: EPERM */
2, /* 2: ENOENT --> 2: ENOENT */
3, /* 3: ESRCH --> 3: ESRCH */
4, /* 4: EINTR --> 4: EINTR */
5, /* 5: EIO --> 5: EIO */
6, /* 6: ENXIO --> 6: ENXIO */
7, /* 7: E2BIG --> 7: E2BIG */
...
The output may be used in the `$SRC/common/brand/lx/lx_errno.c` file.
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