Messages in this thread | | | Date | Fri, 12 Mar 2004 12:16:38 -0800 | From | Ulrich Drepper <> | Subject | host name length |
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POSIX nowadays contains
_POSIX_HOST_NAME_MAX and HOST_NAME_MAX
for programs to use to learn about the maximum host name length which is allowed. _POSIX_HOST_NAME_MAX is the standard-required minimum maximum and the value must be 256.
The problem is that HOST_NAME_MAX currently is defined as 64, as defined by __NET_UTS_LEN in <linux/utsname.h>. I.e., we have HOST_NAME_MAX as smaller than the minimum maximum which is obviously not POSIX compliant.
Now, we can simply ignore the problem or do something about it and introduce a third version of the utsname structure with sufficiently big nodename field.
Many OSes used small values before but 256 was chosen as a minimum maximum and some OSes were changed since host names longer than 64 chars indeed do exist. I wonder why this never has been brought to the attention. Or were people happy enough with truncated host names?
Anyway, is there interest in getting this changed?
-- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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