Module:
Description
If you mistakenly call open (rather than opendir) on a directory, and then try to read from what you thought was a directory handle, you will get an unclear error. This could be improved.
(This was inspired by this Perlmonks discussion.)
Steps to Reproduce
#!/usr/bin/env perl
use strict;
use warnings;
open (my $dh, "/etc") or die "Could not open dir for reading: $!\n"; # should be opendir
my @files = readdir $dh; # this is actually a file handle but coder thought it was a directory handle
print @files;
output:
readdir() attempted on invalid dirhandle $dh at test.pl line 7.
Expected behavior
A not-unreasonable expectation would be an error or warning when trying to call open on a directory, but it seems like there's nothing intrinsically invalid about doing this. However, when calling readdir on a filehandle, perhaps a better error could be reported.
Perl configuration
Summary of my perl5 (revision 5 version 38 subversion 2) configuration:
Platform:
osname=linux
osvers=5.12.15-arch1-1
archname=x86_64-linux-thread-multi
uname='archlinux'
config_args='-des -Dusethreads -Duseshrplib -Doptimize=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -g -ffile-prefix-map=/build/perl/src=/usr/src/debug/perl -flto=auto -Dprefix=/usr -Dvendorprefix=/usr -Dprivlib=/usr/share/perl5/core_perl -Darchlib=/usr/lib/perl5/5.38/core_perl -Dsitelib=/usr/share/perl5/site_perl -Dsitearch=/usr/lib/perl5/5.38/site_perl -Dvendorlib=/usr/share/perl5/vendor_perl -Dvendorarch=/usr/lib/perl5/5.38/vendor_perl -Dscriptdir=/usr/bin/core_perl -Dsitescript=/usr/bin/site_perl -Dvendorscript=/usr/bin/vendor_perl -Dinc_version_list=none -Dman1ext=1perl -Dman3ext=3perl -Dlddlflags=-shared -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto -Dldflags=-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto -Dloclibpth=/usr/lib/db5.3 -Dlocincpth=/usr/include/db5.3'
hint=recommended
useposix=true
d_sigaction=define
useithreads=define
usemultiplicity=define
use64bitint=define
use64bitall=define
uselongdouble=undef
usemymalloc=n
default_inc_excludes_dot=define
Compiler:
cc='cc'
ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/include/db5.3 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
optimize='-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -g -ffile-prefix-map=/build/perl/src=/usr/src/debug/perl -flto=auto'
cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/include/db5.3'
ccversion=''
gccversion='13.2.1 20230801'
gccosandvers=''
intsize=4
longsize=8
ptrsize=8
doublesize=8
byteorder=12345678
doublekind=3
d_longlong=define
longlongsize=8
d_longdbl=define
longdblsize=16
longdblkind=3
ivtype='long'
ivsize=8
nvtype='double'
nvsize=8
Off_t='off_t'
lseeksize=8
alignbytes=8
prototype=define
Linker and Libraries:
ld='cc'
ldflags ='-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto -fstack-protector-strong -L/usr/lib/db5.3'
libpth=/usr/local/lib /usr/lib /usr/lib/db5.3
libs=-lpthread -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc
libc=/lib/../lib/libc.so.6
so=so
useshrplib=true
libperl=libperl.so
gnulibc_version='2.39'
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=so
d_dlsymun=undef
ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/5.38/core_perl/CORE'
cccdlflags='-fPIC'
lddlflags='-shared -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto -L/usr/lib/db5.3 -fstack-protector-strong'
Characteristics of this binary (from libperl):
Compile-time options:
HAS_LONG_DOUBLE
HAS_STRTOLD
HAS_TIMES
MULTIPLICITY
PERLIO_LAYERS
PERL_COPY_ON_WRITE
PERL_DONT_CREATE_GVSV
PERL_HASH_FUNC_SIPHASH13
PERL_HASH_USE_SBOX32
PERL_MALLOC_WRAP
PERL_OP_PARENT
PERL_PRESERVE_IVUV
PERL_USE_SAFE_PUTENV
USE_64_BIT_ALL
USE_64_BIT_INT
USE_ITHREADS
USE_LARGE_FILES
USE_LOCALE
USE_LOCALE_COLLATE
USE_LOCALE_CTYPE
USE_LOCALE_NUMERIC
USE_LOCALE_TIME
USE_PERLIO
USE_PERL_ATOF
USE_REENTRANT_API
USE_THREAD_SAFE_LOCALE
Built under linux
Compiled at Feb 11 2024 19:15:41
@INC:
/usr/lib/perl5/5.38/site_perl
/usr/share/perl5/site_perl
/usr/lib/perl5/5.38/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib/perl5/5.38/core_perl
/usr/share/perl5/core_perl
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