can't open() more than 256 files on Solaris

[p5pRT]

Migrated from rt.perl.org#46749 (status was 'rejected')

Searchable as RT46749$

[p5pRT]

From @rlegene

Created by @rlegene

Seemingly on Solaris 7 @​ sparc, Solaris 9 @​ sparc, Solaris 10
@​ intel I can't get perl to return file number 256 to me. Truss
shows that up to file descriptor #255 are returned to the script
as it is supposed to, but #256 is immediately closed by perl, and
undef is returned.

open("/dev/null", O_RDONLY) = 255
fstat(255, 0x0010F9D8) = 0
fcntl(255, F_SETFD, 0x00000001) = 0
Just got fileno 255
write(1, " J u s t g o t f i l".., 20) = 20
open("/dev/null", O_RDONLY) = 256
close(256) = 0
getcontext(0xFFBFED58)
getcontext(0xFFBFEBF8)
open("/dev/null", O_RDONLY) = 256
close(256) = 0
Perl's open() is b0rken​: Too many open files, stopped at ./256.pl line 18.
write(2, " P e r l ' s o p e n (".., 75) = 75

$ ulimit -n 1234
$ ./256.pl
[...]
Just got fileno 252
Just got fileno 253
Just got fileno 254
Just got fileno 255
Perl's open() is b0rken​: Too many open files, stopped at ./256.pl line 18.
$ cat 256.pl
#!/usr/bin/perl -w

use strict;
use warnings;
use IO​::File;

my @​a;
while (1) {
  my $fh = new IO​::File('/dev/null');
  if ($fh) {
  printf "Just got fileno %d\n", $fh->fileno;
  push @​a, $fh;
  exit if $fh->fileno > 1029;
  } else {
  last;
  }
}
open HAHA, "/dev/null" or die "Perl's open() is b0rken​: $!, stopped";

The extra open, is to make sure the fault is not in IO​::File.

.. and it's not an OS issue, because it works in C.

$ cat 256.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

main() {
  int fh;
  while (1) {
  fh = open("/dev/null", O_RDONLY);
  if (fh == -1) {
  perror("open");
  exit(1);
  }
  printf("Just got fileno %d\n", fh);
  if (fh > 1030) exit(0);
  }
}
~
robert@​thunder (0)$ make 256
gcc 256.c -o 256
$ ./256|tail -2
Just got fileno 1030
Just got fileno 1031

Perl Info

Flags:
    category=core
    severity=high

Site configuration information for perl v5.8.0:

Configured by haarbo at Sun Jan 19 13:33:31 CET 2003.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
  Platform:
    osname=solaris, osvers=2.9, archname=sun4-solaris
    uname='sunos thunder 5.9 generic_112233-03 sun4u sparc sunw,sun-fire-280r '
    config_args='-Dcc=gcc'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=undef usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-fno-strict-aliasing',
    optimize='-O',
    cppflags='-fno-strict-aliasing'
    ccversion='', gccversion='3.2.1', gccosandvers='solaris2.9'
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=4321
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=4
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc
    perllibs=-lsocket -lnsl -ldl -lm -lc
    libc=, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches:
    


@INC for perl v5.8.0:
    /usr/local/lib/perl5/5.8.0/sun4-solaris
    /usr/local/lib/perl5/5.8.0
    /usr/local/lib/perl5/site_perl/5.8.0/sun4-solaris
    /usr/local/lib/perl5/site_perl/5.8.0
    /usr/local/lib/perl5/site_perl
    .


Environment for perl v5.8.0:
    HOME=/home/robert
    LANG (unset)
    LANGUAGE (unset)
    LC_CTYPE=iso_8859_1
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/robert/bin:/usr/local/bin:/home/robert/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/sbin/:/usr/local/bin:/usr/bin:/usr/ccs/bin:/usr/ucb:/usr/sbin:/opt/gnu/bin:/usr/local/ssl:/usr/local/ssl/bin:/usr/local/mysql/bin:/opt/SUNWppro/bin:/usr/sadm/bin:/usr/local/perl:/usr/local/pim/bin:/usr/openwin/bin:/usr/local/sbin/:/usr/local/bin:/usr/bin:/usr/ccs/bin:/usr/ucb:/usr/sbin:/opt/gnu/bin:/usr/local/ssl:/usr/local/ssl/bin:/usr/local/mysql/bin:/opt/SUNWppro/bin:/usr/sadm/bin:/usr/local/perl:/usr/local/pim/bin:/usr/openwin/bin
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/bash

[p5pRT]

From [email protected]

32-bit STDIO on Solaris doesn't support > 256 file descriptors. Either
compile for 64-bit, or I believe there was a libc.a work around to
re-enable this?

In any case, it isn't a Perl limitation.

Cheers,
mark

Robert Martin-Legène (via RT) wrote​:

# New Ticket Created by Robert Martin-Legène
# Please include the string​: [perl #46749]
# in the subject line of all future correspondence about this issue.
# <URL​: http​://rt.perl.org/rt3/Ticket/Display.html?id=46749 >

This is a bug report for perl from robert@​martin-legene.dk,
generated with the help of perlbug 1.34 running under perl v5.8.0.

-----------------------------------------------------------------
[Please enter your report here]
Seemingly on Solaris 7 @​ sparc, Solaris 9 @​ sparc, Solaris 10
@​ intel I can't get perl to return file number 256 to me. Truss
shows that up to file descriptor #255 are returned to the script
as it is supposed to, but #256 is immediately closed by perl, and
undef is returned.

open("/dev/null", O_RDONLY) = 255
fstat(255, 0x0010F9D8) = 0
fcntl(255, F_SETFD, 0x00000001) = 0
Just got fileno 255
write(1, " J u s t g o t f i l".., 20) = 20
open("/dev/null", O_RDONLY) = 256
close(256) = 0
getcontext(0xFFBFED58)
getcontext(0xFFBFEBF8)
open("/dev/null", O_RDONLY) = 256
close(256) = 0
Perl's open() is b0rken​: Too many open files, stopped at ./256.pl line 18.
write(2, " P e r l ' s o p e n (".., 75) = 75

$ ulimit -n 1234
$ ./256.pl
[...]
Just got fileno 252
Just got fileno 253
Just got fileno 254
Just got fileno 255
Perl's open() is b0rken​: Too many open files, stopped at ./256.pl line 18.
$ cat 256.pl
#!/usr/bin/perl -w

use strict;
use warnings;
use IO​::File;

my @​a;
while (1) {
my $fh = new IO​::File('/dev/null');
if ($fh) {
printf "Just got fileno %d\n", $fh->fileno;
push @​a, $fh;
exit if $fh->fileno > 1029;
} else {
last;
}
}
open HAHA, "/dev/null" or die "Perl's open() is b0rken​: $!, stopped";

The extra open, is to make sure the fault is not in IO​::File.

.. and it's not an OS issue, because it works in C.

$ cat 256.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

main() {
int fh;
while (1) {
fh = open("/dev/null", O_RDONLY);
if (fh == -1) {
perror("open");
exit(1);
}
printf("Just got fileno %d\n", fh);
if (fh > 1030) exit(0);
}
}
~
robert@​thunder (0)$ make 256
gcc 256.c -o 256
$ ./256|tail -2
Just got fileno 1030
Just got fileno 1031

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags​:
category=core
severity=high
---
Site configuration information for perl v5.8.0​:

Configured by haarbo at Sun Jan 19 13​:33​:31 CET 2003.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration​:
Platform​:
osname=solaris, osvers=2.9, archname=sun4-solaris
uname='sunos thunder 5.9 generic_112233-03 sun4u sparc sunw,sun-fire-280r '
config_args='-Dcc=gcc'
hint=recommended, useposix=true, d_sigaction=define
usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
useperlio=define d_sfio=undef uselargefiles=undef usesocks=undef
use64bitint=undef use64bitall=undef uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler​:
cc='gcc', ccflags ='-fno-strict-aliasing',
optimize='-O',
cppflags='-fno-strict-aliasing'
ccversion='', gccversion='3.2.1', gccosandvers='solaris2.9'
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=4321
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=4
alignbytes=8, prototype=define
Linker and Libraries​:
ld='gcc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib /usr/ccs/lib
libs=-lsocket -lnsl -ldl -lm -lc
perllibs=-lsocket -lnsl -ldl -lm -lc
libc=, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version=''
Dynamic Linking​:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches​:

---
@​INC for perl v5.8.0​:
/usr/local/lib/perl5/5.8.0/sun4-solaris
/usr/local/lib/perl5/5.8.0
/usr/local/lib/perl5/site_perl/5.8.0/sun4-solaris
/usr/local/lib/perl5/site_perl/5.8.0
/usr/local/lib/perl5/site_perl
.

---
Environment for perl v5.8.0​:
HOME=/home/robert
LANG (unset)
LANGUAGE (unset)
LC_CTYPE=iso_8859_1
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/robert/bin​:/usr/local/bin​:/home/robert/bin​:/usr/local/bin​:/usr/bin​:/bin​:/usr/sbin​:/sbin​:/usr/local/bin​:/usr/local/sbin/​:/usr/local/bin​:/usr/bin​:/usr/ccs/bin​:/usr/ucb​:/usr/sbin​:/opt/gnu/bin​:/usr/local/ssl​:/usr/local/ssl/bin​:/usr/local/mysql/bin​:/opt/SUNWppro/bin​:/usr/sadm/bin​:/usr/local/perl​:/usr/local/pim/bin​:/usr/openwin/bin​:/usr/local/sbin/​:/usr/local/bin​:/usr/bin​:/usr/ccs/bin​:/usr/ucb​:/usr/sbin​:/opt/gnu/bin​:/usr/local/ssl​:/usr/local/ssl/bin​:/usr/local/mysql/bin​:/opt/SUNWppro/bin​:/usr/sadm/bin​:/usr/local/perl​:/usr/local/pim/bin​:/usr/openwin/bin
PERL_BADLANG (unset)
SHELL=/usr/local/bin/bash

--
Mark Mielke <mark@​mielke.cc>

[p5pRT]

The RT System itself - Status changed from 'new' to 'open'

[p5pRT]

@rgs - Status changed from 'open' to 'rejected'