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signal flags not restored #6882

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p5pRT opened this issue Oct 30, 2003 · 3 comments
Open

signal flags not restored #6882

p5pRT opened this issue Oct 30, 2003 · 3 comments
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distro-Linux lexical/scope/closure type-core type-OS-interaction

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@p5pRT
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p5pRT commented Oct 30, 2003

Migrated from rt.perl.org#24366 (status was 'open')

Searchable as RT24366$
@p5pRT
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p5pRT commented Oct 30, 2003

From powerman@sky.net.ua

Created by powerman@sky.net.ua

1. Use POSIX's sigaction() to modify signal flags.
2. Temporary change signal handler using local().
3. After local() signal restored with unmodified flags. :(

use POSIX;
$SIG{NUM50} = sub {};
my $act = bless({}, "POSIX​::SigAction");
sigaction(50, undef, $act);
$act->{FLAGS} |= &POSIX​::SA_RESTART;
sigaction(50, $act);
sigaction(50, undef, $act);
print "SA_RESTART​: ", $act->{FLAGS} & &POSIX​::SA_RESTART ? "yes" : "no", "\n";
{ local $SIG{NUM50}="IGNORE" }
sigaction(50, undef, $act);
print "SA_RESTART​: ", $act->{FLAGS} & &POSIX​::SA_RESTART ? "yes" : "no", "\n";

Probably perl must use sigaction() call to save old handler with flags?

Perl Info 

Flags:
    category=core
    severity=high

Site configuration information for perl v5.8.0:

Configured by root at Tue Feb 11 17:22:15 EET 2003.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.4.19, archname=i686-linux-thread-multi
    uname='linux home.power 2.4.19 #1 ×ÓË Á×Ç 18 00:22:21 eest 2002 i686 unknown '
    config_args='-Dprefix=/usr -Doptimize= -O3 -march=athlon -mcpu=athlon  -d -e -s -Dinstallprefix=/usr -Dusethreads'
    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 -march=athlon -mcpu=athlon ',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing'
    ccversion='', gccversion='3.0', 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 =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lndbm -ldbm -ldb -ldl -lm -lpthread -lc -lcrypt -lutil
    perllibs=-lnsl -ldl -lm -lpthread -lc -lcrypt -lutil
    libc=/lib/libc-2.2.5.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.2.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    


@INC for perl v5.8.0:
    /usr/lib/perl5/5.8.0/i686-linux-thread-multi
    /usr/lib/perl5/5.8.0
    /usr/lib/perl5/site_perl/5.8.0/i686-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.0
    /usr/lib/perl5/site_perl
    .


Environment for perl v5.8.0:
    HOME=/home/powerman
    LANG=ru_RU.koi8r
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/powerman/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

@p5pRT
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p5pRT commented Dec 12, 2011

From @Leont

On Thu Oct 30 08​:34​:26 2003, powerman@​sky.net.ua wrote​:

[Please enter your report here]

1. Use POSIX's sigaction() to modify signal flags.
2. Temporary change signal handler using local().
3. After local() signal restored with unmodified flags. :(

use POSIX;
$SIG{NUM50} = sub {};
my $act = bless({}, "POSIX​::SigAction");
sigaction(50, undef, $act);
$act->{FLAGS} |= &POSIX​::SA_RESTART;
sigaction(50, $act);
sigaction(50, undef, $act);
print "SA_RESTART​: ", $act->{FLAGS} & &POSIX​::SA_RESTART ? "yes" :
"no", "\n";
{ local $SIG{NUM50}="IGNORE" }
sigaction(50, undef, $act);
print "SA_RESTART​: ", $act->{FLAGS} & &POSIX​::SA_RESTART ? "yes" :
"no", "\n";

Probably perl must use sigaction() call to save old handler with
flags?

This is asking a lot of special casing. I suspect it's possible to do
this (by using localization magic on the %SIG entries), but I'm not sure
it's really worth it.

Leon

@p5pRT
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p5pRT commented Dec 12, 2011

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

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