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Do not exit shell on Ctrl+C with SIGINT ignored (re: 7e5fd3e9)

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The killpg(getpgrp(),SIGINT) call added to ed_getchar() in that
commit caused the interactive shell to exit on ^C even if SIGINT is
being ignored. We cannot revert or remove that call without
breaking job control. This commit applies a new fix instead.

Reproducers fixed by this commit:

  SIGINT ignored by child:

    $ PS1='childshell$ ' ksh
    childshell$ trap '' INT
    childshell$ (press Ctrl+C)
    $

  SIGINT ignored by parent:

    $ (trap '' INT; ENV=/./dev/null PS1='childshell$ ' ksh)
    childshell$ (press Ctrl+C)
    $

  SIGINT ignored by parent, trapped in child:

    $ (trap '' INT; ENV=/./dev/null PS1='childshell$ ' ksh)
    childshell$ trap 'echo test' INT
    childshell$ (press Ctrl+C)
    $

I've experimentally determined that, under these conditions, the
SFIO stream error state is set to 256 == 0400 == SH_EXITSIG.

src/cmd/ksh93/sh/main.c: exfile():
- On EOF or error, do not return (exiting the shell) if the shell
  state is interactive and if sferror(iop)==SH_EXITSIG.
- Refactor that block a little to make the new check fit in nicely.

src/cmd/ksh93/tests/pty.sh:
- Test the above three reproducers.

Fixes: https://github.com/ksh93/ksh/issues/343
This commit is contained in:
Martijn Dekker 2021-12-16 16:40:42 +01:00
parent 4856847631
commit 2bc1d814c9
3 changed files with 64 additions and 8 deletions
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27
src/cmd/ksh93/sh/main.c
View file

@ -535,20 +535,31 @@ static void exfile(register Shell_t *shp, register Sfio_t *iop,register int fno)
errno = 0;
if(tdone || !sfreserve(iop,0,0))
{
int sferr;
eof_or_error:
if(sh_isstate(SH_INTERACTIVE) && !sferror(iop))
sferr = sferror(iop);
if(sh_isstate(SH_INTERACTIVE))
{
if(--maxtry>0 && sh_isoption(SH_IGNOREEOF) &&
!sferror(sfstderr) && (shp->fdstatus[fno]&IOTTY))
if(!sferr)
{
sfclrerr(iop);
errormsg(SH_DICT,0,e_logout);
if(--maxtry>0 && sh_isoption(SH_IGNOREEOF)
&& !sferror(sfstderr) && (shp->fdstatus[fno]&IOTTY))
{
sfclrerr(iop);
errormsg(SH_DICT,0,e_logout);
continue;
}
else if(job_close(shp)<0)
continue;
}
else if(sferr==SH_EXITSIG)
{
/* Ctrl+C with SIGINT ignored */
sfputc(sfstderr,'\n');
continue;
}
else if(job_close(shp)<0)
continue;
}
if(errno==0 && sferror(iop) && --maxtry>0)
if(errno==0 && sferr && --maxtry>0)
{
sfclrlock(iop);
sfclrerr(iop);