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Re^7: looking for feedback on my first script

by haukex (Bishop)
on Jan 10, 2021 at 00:58 UTC ( #11126683=note: print w/replies, xml ) Need Help??


in reply to Re^6: looking for feedback on my first script
in thread looking for feedback on my first script

In Perl, if printf() fails, a fatal error will be thrown long before it returns to the caller.
I disagree about printf() errors. With normal file operations, what I said is true. It is almost impossible for a print or printf to "fail" once a local Hard Disk file handle is open. One way would be "File system full", but in that case, a fatal exception is thrown - the calling program won't see that.

Test before posting. Confidently making incorrect statements doesn't help anyone.

#!/usr/bin/env perl use warnings; use strict; my $file = $^O eq 'MSWin32' ? "P:\\foo" : '/tmp/foo/bar'; open my $fh, '>', $file or die "$file: $!"; my $data = "\0" x 2_000_000; print "Writing ", length $data, " bytes to $file\n"; printf $fh "%s", $data or warn "printf: $!"; close $fh or warn "close: $!"; print "Still not fatal\n"; __END__ Windows: Install https://www.ltr-data.se/opencode.html/#ImDisk As Administrator: > imdisk -a -t vm -m P: -s 1M -p "/fs:fat /q /y" > perl write.pl Writing 2000000 bytes to P:\foo printf: No space left on device at write.pl line 9. close: No space left on device at write.pl line 10. Still not fatal > imdisk -D -m P: Linux: $ mkdir -vp /tmp/foo $ sudo mount -t tmpfs -o size=1M,uid=`id -u` tmpfs /tmp/foo $ perl write.pl Writing 2000000 bytes to /tmp/foo/bar printf: No space left on device at write.pl line 9. close: No space left on device at write.pl line 10. Still not fatal $ sudo umount /tmp/foo

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