[perl #93428] potential race condition when mixing signals and select()

# New Ticket Created by  E R 
# Please include the string:  [perl #93428]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=93428 >


This is a bug report for perl from pc88mxer@gmail.com
generated with the help of perlbug 1.39 running under perl 5.12.1.


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[Please describe your issue here]

>From this discussion on perlmonks:

http://perlmonks.com/?node_id=908535

it seems there is a race condition when mixing signals and select().

A solution is to use pselect() instead of select() when available.

[Please do not change anything below this line]
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---
Flags:
    category=core
    severity=low
---
Site configuration information for perl 5.12.1:

Configured by pc88mxer at Wed Aug  4 11:52:39 CDT 2010.

Summary of my perl5 (revision 5 version 12 subversion 1) configuration:

  Platform:
    osname=linux, osvers=2.6.32-24-generic-pae, archname=i686-linux
    uname='linux pc88mxer-laptop 2.6.32-24-generic-pae #38-ubuntu smp
mon jul 5 10:54:21 utc 2010 i686 gnulinux '
    config_args='-des -Dprefix=/home/pc88mxer/apps/perl-5.12'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.4.3', 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 =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/lib64
    libs=-lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.11.1.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.11.1'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib
-fstack-protector'

• [perl #93428] potential race condition when mixing signals and select() by E R