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Report information
Id: 72428
Status: open
Priority: 0/
Queue: perl5

Owner: Nobody
Requestors: jochen.perl [at] leahnim.org
Cc:
AdminCc:

Operating System: Linux
PatchStatus: (no value)
Severity: low
Type: core
Perl Version: 5.8.8
Fixed In: (no value)



Subject: sysread does not work on a filehandle to a scalar
Date: Fri, 29 Jan 2010 13:10:05 -0500 (EST)
To: perlbug [...] perl.org
From: jochen [...] leahnim.org
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This is a bug report for perl from jochen.perl@leahnim.org, generated with the help of perlbug 1.35 running under perl v5.8.8. ----------------------------------------------------------------- [Please enter your report here] Testcase by ikegami: Show quoted text
>c:\progs\perl580\bin\perl -le"$f='abc'; open $fh,'<',\$f or die; print read($fh,$b,2) ? $b : $!"
ab Show quoted text
>c:\progs\perl580\bin\perl -le"$f='abc'; open $fh,'<',\$f or die; print sysread($fh,$b,2) ? $b : $!"
Bad file descriptor So using sysread on a filehandle to a scalar fails. While this may be somewhat expected since obviously you can't call the system read function on such a "fake" filehandle, it means it's not possible to pass a filehandle like that to a module that uses sysread. It seems like this should be special-cased in sysread to make this work. [Please do not change anything below this line] ----------------------------------------------------------------- --- Flags: category=core severity=low --- This perlbug was built using Perl v5.8.8 in the Red Hat build system. It is being executed now by Perl v5.8.8 - Thu Aug 28 09:56:48 EDT 2008. Site configuration information for perl v5.8.8: Configured by Red Hat, Inc. at Thu Aug 28 09:56:48 EDT 2008. Summary of my perl5 (revision 5 version 8 subversion 8) configuration: Platform: osname=linux, osvers=2.6.18-92.1.10.el5xen, archname=i386-linux-thread-multi uname='linux xenbuilder4.fedora.phx.redhat.com 2.6.18-92.1.10.el5xen #1 smp wed jul 23 04:11:52 edt 2008 i686 i686 i386 gnulinux ' config_args='-des -Doptimize=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -Dversion=5.8.8 -Dmyhostname=localhost -Dperladmin=root@localhost -Dcc=gcc -Dcf_by=Red Hat, Inc. -Dinstallprefix=/usr -Dprefix=/usr -Darchname=i386-linux -Dvendorprefix=/usr -Dsiteprefix=/usr -Duseshrplib -Dusethreads -Duseithreads -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db -Ui_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio -Dinstallusrbinperl=n -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less -isr -Dd_gethostent_r_proto -Ud_endhostent_r_proto -Ud_sethostent_r_proto -Ud_endprotoent_r_proto -Ud_setprotoent_r_proto -Ud_endservent_r_proto -Ud_setservent_r_proto -Dinc_version_list=5.8.7 5.8.6 5.8.5 -Dscriptdir=/usr/bin' hint=recommended, useposix=true, d_sigaction=define usethreads=define use5005threads=undef useithreads=define usemultiplicity=define useperlio=define d_sfio=undef uselargefiles=define usesocks=undef use64bitint=undef use64bitall=undef uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm', optimize='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables', cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/local/include -I/usr/include/gdbm' ccversion='', gccversion='4.1.2 20070925 (Red Hat 4.1.2-33)', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=4, prototype=define Linker and Libraries: ld='gcc', ldflags =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib libs=-lresolv -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc libc=/lib/libc-2.7.so, so=so, useshrplib=true, libperl=libperl.so gnulibc_version='2.7' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE' cccdlflags='-fPIC', lddlflags='-shared -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -L/usr/local/lib' Locally applied patches: --- @INC for perl v5.8.8: /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.7/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.6/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/site_perl/5.8.6 /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.7/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.6/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl/5.8.7 /usr/lib/perl5/vendor_perl/5.8.6 /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl /usr/lib/perl5/5.8.8/i386-linux-thread-multi /usr/lib/perl5/5.8.8 . --- Environment for perl v5.8.8: HOME=/home/jochen LANG=en_US.UTF-8 LANGUAGE (unset) LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/sbin:/usr/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/games:/usr/games PERL_BADLANG (unset) SHELL=/bin/bash
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Same results in latest blead (v5.11.4-43-g5e58db1*). Feb 02 00:30:51 2010, jochen.perl@leahnim.org wrote: Show quoted text
> >c:\progs\perl580\bin\perl -le"$f='abc'; open $fh,'<',\$f or die;
> print read($fh,$b,2) ? $b : $!" > ab >
> >c:\progs\perl580\bin\perl -le"$f='abc'; open $fh,'<',\$f or die;
> print sysread($fh,$b,2) ? $b : $!" > Bad file descriptor
-- Alexandr Ciornii, http://chorny.net


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