1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
37 lines
816 B
Perl
37 lines
816 B
Perl
#
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# Simple package to get the hostname via __sysctl(2).
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#
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# Written 13-Feb-96 by Jörg Wunsch, interface business GmbH Dresden.
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# Placed in the public domain.
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#
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# $FreeBSD$
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#
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package gethostname;
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require "sys/syscall.ph";
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require "sys/sysctl.ph";
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#
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# usage:
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#
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# require "gethostname.pl";
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# printf "This machine is named \"%s\".\n", &gethostname;
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#
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sub main'gethostname {
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# get hostname via sysctl(2)
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local($name, $oldval, $oldlen, $len);
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$name = pack("LL", &CTL_KERN, &KERN_HOSTNAME);
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# 64-byte string to get the hostname
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$oldval = " " x 64;
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$oldlen = pack("L", length($oldval));
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syscall(&SYS___sysctl, $name, 2, $oldval, $oldlen, 0, 0) != -1 ||
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die "Cannot get hostname via sysctl(2), errno = $!\n";
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($len) = unpack("L", $oldlen);
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return substr($oldval, 0, $len - 1);
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}
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1;
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