Re: fg tcsetpgrp() SIGTTIN/SIGTTOU race

[Chet Ramey]

On 7/18/23 11:50 PM, Earl Chew wrote:

> Interestingly dash/ash does not exhibit this behaviour. Looking at the
> implementation since 1994 shows that it issues SIGCONT unconditionally
> after TIOCSPGRP:
>
> https://svnweb.freebsd.org/base/head/bin/sh/jobs.c?revision=1556&view=markup#l175
>
> https://svnweb.freebsd.org/base/head/bin/sh/jobs.c?revision=1556&view=markup#l207
>
> The prior art suggested by dash/ash is that bash should send SIGCONT
> unconditionally after tcsetpgrp() when moving a program to the
> foreground.

Thanks for the report. Let's try it, since sending SIGCONT to a process
should not have any negative side effects.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/