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Diffstat (limited to 'mcon/U/startperl.U')
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1 files changed, 95 insertions, 0 deletions
diff --git a/mcon/U/startperl.U b/mcon/U/startperl.U new file mode 100644 index 0000000..dbc6dfb --- /dev/null +++ b/mcon/U/startperl.U @@ -0,0 +1,95 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic Licence, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic Licence; a copy of which may be found at the root +?RCS: of the source tree for dist 4.0. +?RCS: +?RCS: $Log: startperl.U,v $ +?RCS: Revision 3.0.1.1 1997/02/28 16:25:06 ram +?RCS: patch61: warn them if the #! line is too long for their OS +?RCS: +?RCS: Revision 3.0 1993/08/18 12:09:50 ram +?RCS: Baseline for dist 3.0 netwide release. +?RCS: +?MAKE:startperl: cat rm sharpbang perlpath d_portable Myread +?MAKE: -pick add $@ %< +?S:startperl: +?S: This variable contains the string to put on the front of a perl +?S: script to make sure (hopefully) that it runs with perl and not some +?S: shell. Of course, that leading line must be followed by the classical +?S: perl idiom: +?S: eval 'exec perl -S $0 ${1+"$@"}' +?S: if $running_under_some_shell; +?S: to guarantee perl startup should the shell execute the script. Note +?S: that this magic incatation is not understood by csh. +?S:. +?C:STARTPERL: +?C: This symbol is the string that should be put on the front of a +?C: perl script to make sure (hopefully) that it runs with perl and +?C: not under some shell. That line should be followed by the classical +?C: invocation magic: +?C: eval 'exec perl -S $0 ${1+"$@"}' +?C: if $running_under_some_shell; +?C: to guarantee perl startup should the shell execute the script at first. +?C:. +?H:#define STARTPERL "$startperl" +?H:. +?T:pdflt +?F:!xtry +: figure out how to guarantee perl startup +case "$sharpbang" in +*!) +?X: +?X: Make sure the #!$perlpath magic incantation indeed works on this +?X: system... It might not if the length of the #! hook is greater +?X: than some hardwired kernel limit. -- RAM, 15/03/96 +?X: + $cat >xtry <<EOP +#!$perlpath +system("exit 0"); +EOP + chmod a+x xtry + if ./xtry >/dev/null 2>&1; then + $cat <<EOH + +I can use the #! construct to start perl on your system. This will make +startup of perl scripts faster, but may cause problems if you want to share +those scripts and perl is not in a standard place (/usr/bin/perl) on all your +platforms. The alternative is to force a shell by starting the script with a +single ':' character. + +EOH + pdflt=y + else + $cat <<EOH + +I could use the #! construct to start perl on your system, but using + #!$perlpath +would be too long for your kernel to grok. Indeed, most systems do +limit the size of the leading #! string to 32 characters. + +EOH + pdflt=n + fi + $rm -f xtry + case "$startperl" in + *!*) dflt=y;; + '') case "$d_portable" in + "$define") dflt=n;; + *) dflt=$pdflt;; + esac;; + *) dflt=n;; + esac + rp='Shall I use #! to start up perl?' + . ./myread + case "$ans" in + y*|Y*) startperl="#!$perlpath";; + *) startperl=": # use perl";; + esac;; +*) startperl=": # use perl";; +esac + |