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[perl #20525] Perl's stdio layer doesn't handle EINTR

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From:
perlbug-followup
Date:
January 24, 2003 07:55
Subject:
[perl #20525] Perl's stdio layer doesn't handle EINTR
Message ID:
rt-20525-49632.14.9880765702524@bugs6.perl.org
# New Ticket Created by  mls@suse.de 
# Please include the string:  [perl #20525]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=20525 >



This is a bug report for perl from mls@suse.de,
generated with the help of perlbug 1.34 running under perl v5.8.0.


-----------------------------------------------------------------
[Please enter your report here]

Perl's stdio IO layer doesn't restart the library calls if
they return EINTR. Old perl versions aren't affected as they
use SA_RESTART when they set up the signal handlers.

Test program:

use POSIX;

$SIG{CHLD} = sub {};

if (fork() == 0) {
  $ppid = getppid;
  while (1) {
    exit if kill(POSIX::SIGCHLD, $ppid) != 1;
  }
}
$cnt = 0;
open(F, "cat /etc/termcap|") || die "open\n";
$cnt++ while <F>;
close F;
print "-> $cnt\n";

The test program often returns zero read lines (GNU glibc). Adding
    binmode F, ":unix"
fixes this, of course.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
This perlbug was built using Perl v5.8.0 - Mon Sep  9 18:12:37 UTC 2002
It is being executed now by  Perl v5.8.0 - Mon Sep  9 18:02:36 UTC 2002.

Site configuration information for perl v5.8.0:

Configured by root at Mon Sep  9 18:02:36 UTC 2002.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.4.19, archname=i586-linux-thread-multi
    uname='linux bloembergen 2.4.19 #1 mon apr 15 08:57:26 gmt 2002 i686 unknown '
    config_args='-ds -e -Dprefix=/usr -Dusethreads -Di_db -Di_dbm -Di_ndbm -Di_gdbm -Duseshrplib=true'
    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='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3 --pipe',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing'
    ccversion='', gccversion='3.2', 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='cc', ldflags =''
    libpth=/lib /usr/lib /usr/local/lib
    libs=-lnsl -ldl -lm -lpthread -lc -lcrypt -lutil
    perllibs=-lnsl -ldl -lm -lpthread -lc -lcrypt -lutil
    libc=, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.2.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic -Wl,-rpath,/usr/lib/perl5/5.8.0/i586-linux-thread-multi/CORE'
    cccdlflags='-fPIC', lddlflags='-shared'

Locally applied patches:
    

---
@INC for perl v5.8.0:
    /usr/lib/perl5/5.8.0/i586-linux-thread-multi
    /usr/lib/perl5/5.8.0
    /usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.0
    /usr/lib/perl5/site_perl
    .

---
Environment for perl v5.8.0:
    HOME=/suse/mls
    LANG (unset)
    LANGUAGE (unset)
    LC_COLLATE=POSIX
    LC_CTYPE=de_DE@euro
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/suse/mls/bin:/opt/kde3/bin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin:/bin:/usr/lib/java/bin:/usr/games/bin:/usr/games:/opt/gnome/bin:/opt/kde/bin:/usr/openwin/bin:/opt/pilotsdk/bin:/suse/mls/korn
    PERL_BADLANG (unset)
    SHELL=/bin/tcsh


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