jbw@bucsf.bu.edu (Joe Wells) (11/21/90)
In article <10164@jpl-devvax.JPL.NASA.GOV> lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) writes:
I'm still resisting adding gethostname, since there doesn't seem to be
a portable definition of what a host name actually is, where you derive it
from and whether it contains the domain. Not to mention the business that
gateways can have multiple names, one for each interface...
Just think of this as your opportunity to set the standard.
After all, if Perl does it that way it must be right ...
--
Joe Wells <jbw@bu.edu>tchrist@convex.COM (Tom Christiansen) (11/22/90)
In article <JBW.90Nov21002915@bucsf.bu.edu> jbw@bucsf.bu.edu (Joe Wells) writes: >In article <10164@jpl-devvax.JPL.NASA.GOV> lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) writes: > > I'm still resisting adding gethostname, since there doesn't seem to be > a portable definition of what a host name actually is, where you derive it > from and whether it contains the domain. Not to mention the business that > gateways can have multiple names, one for each interface... > >Just think of this as your opportunity to set the standard. > >After all, if Perl does it that way it must be right ... The only advantage that I can see to putting it into perl is that it is different on different systems, something perl manages to gloss over in a lot of cases (see mkdir). Right now, I usually just use chop($host = `hostname`); unless I really want it to blaze, in which case I use: $host = &gethostname || 'Amnesiac'; sub gethostname { local($MAXHOSTNAMELEN) = 64; local($SYS_gethostname) = 87; local($name) = "\0" x $MAXHOSTNAMELEN; syscall($SYS_gethostname, $name, $MAXHOSTNAMELEN) $name; } But this is still evil, cause I should have done a require on syscall.pl and sys/param.pl instead (or ph if you can't get h2pl to work or want fatal errors.) And that system call isn't everywhere. Sometimes 'uuname -l' is better. Sometimes uname is. See attached material. It's just hard to know. That's about the only reason to put it there. But you already have to test system specific things, like icanon mode or whatnot. So it's probably not worth it. Now, it would be kinda nice to have if (__sun__ || __convex__) { so i don't have to go through the pre-processor. --tom Here's how your sitename is determined in rn's Configure. I guess Larry could add it to perl without asking the author's permission. :-) Pretty gross. : now get the site name $echo " " $echo "Figuring out site name..." $echo 'Maybe "hostname" will work...' if ans=`sh -c hostname 2>&1` ; then sitename=$ans hostcmd=hostname else $echo 'No, maybe "uuname -l" will work...' if ans=`sh -c 'uuname -l' 2>&1` ; then sitename=$ans hostcmd='uuname -l' else $echo 'Strange. Maybe "uname -n" will work...' if ans=`sh -c 'uname -n' 2>&1` ; then sitename=$ans hostcmd='uname -n' else $echo 'Oh well, maybe I can mine it out of whoami.h...' if ans=`sh -c $contains' sysname /usr/include/whoami.h' 2>&1` ; then sitename=`$echo "$ans" | $sed 's/^.*"\(.*\)"/\1/'` hostcmd="sed -n -e '"'/sysname/s/^.*\"\\(.*\\)\"/\1/{'"' -e p -e q -e '}' </usr/include/whoami.h" else case "$sitename" in '') $echo "Does this machine have an identity crisis or somethin g?" hostcmd='' ;; *) $echo "Well, you said $sitename before...";; esac fi fi fi fi : you do not want to know about this set $sitename sitename=$1 : translate upper to lower case. This is mostly to help UUCP work right. case $sitename in *[A-Z]*) sitename=`$echo $sitename | tr '[A-Z]' '[a-z]'` $echo "(Normalizing case in your site name)" ;; esac : verify guess if $test "$sitename" ; then $echo 'Your site name appears to be "'$sitename'".' $echo $n "Is this correct? [y] $c" . myread case $ans in y*|'') ;; *) sitename='' ;; esac fi : bad guess or no guess while $test "X$sitename" = X ; do $echo $n "Please type the (one word) name of your site: $c" . myread sitename="$ans" case $hostcmd in sed*) $echo "(That doesn't agree with your whoami.h file, by the way.)" ;; *) $echo "(That doesn't agree with your $hostcmd command, by the way.)" ;; esac hostcmd='' done : try to deal with domains $cat << 'EOH' Please enter your domain name. This will be used in conjunction with the site name for return addresses on news articles and mail. If you use the 4.3ism of having your domain in your hostname, all the posting programs will figure this out on the fly, so don't worry. Examples of some valid domains: berkeley.edu nasa.gov Example of an invalid domain in common use: uucp EOH case "$domain" in '') dflt="uucp";; *) dflt="$domain" ;; esac $echo $n "Your domain: [$dflt] $c" . myread case "$ans" in '') domain="$dflt";; *) domain="$ans" ;; esac if $test $portable = "undef" ; then case $sitename in *.*) ;; *) sitename=$sitename.$domain ;; esac fi