[issue1390] Use id_t type for {get,set}priority()

[Antonio Huete Jimenez (via DragonFly issue tracker)]

Antonio Huete Jimenez <tuxillo at quantumachine.net> added the comment:

id_t is defined in our sys/types.h as described in posix (look for types.h in
http://www.opengroup.org/onlinepubs/9699919799/)

It says:
id_t
    Used as a general identifier; can be used to contain at least a pid_t,
uid_t, or gid_t.

So from my understanding I think it is okay to use id_t.

Regards,
Antonio Huete

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