On Thu, Jul 24, 2014 at 05:30:19PM -0300, Henrique de Moraes Holschuh wrote: > > I wouldn't add the error to the man page until we actually modify the > > kernel to add such a restriction. > > By then, it might be too late. It would be really sad to find ourselves > forced to return ENOSYS to getrandom(GRND_RANDOM) when we actually wanted to > return EPERM/EACCES. I wouldn't worry about. The reality is that anyone using GRND_RANDOM has to be checking for error codes anyway, and if they do something stupid because the system call returns EPERM/EACCESS when they weren't expecting it, again, they are much more likely to be making many other fatal mistakes anyway. In general, all system calls can return errno's other than the ones documented in the man page. This is certainly true for open(2), and read(2) if you are using a network file system such as NFS. Someone who assumes that the only errors that they have to handle is the list in the man page, and assumes that this list is an exhaustive listing of all possible errors, is going to be in a *world* of hurt. I don't think it's necessary to add a sentence that other errors can be returned in the future, and users much check for other errors, but if you really think people are that stupid that we need to say something which is true for every single system call in Linux, we can do that.... - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
