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/freebsd-11.0-release/bin/sh/tests/builtins/
H A Dtrap13.0257399 Wed Oct 30 21:44:36 MDT 2013 jilles sh: Allow trapping SIGINT/SIGQUIT after ignore because of '&'.

If job control is not enabled, background jobs started with ... & ignore
SIGINT and SIGQUIT so that they are not affected by such signals that are
intended for the foreground job. However, this should not prevent
reassigning a different action for these signals (as if the shell invocation
inherited these signal actions from its parent).

Austin group issue #751

Example:
{ trap - INT; exec sleep 10; } & wait
A Ctrl+C should terminate the sleep command.
H A Dtrap14.0257399 Wed Oct 30 21:44:36 MDT 2013 jilles sh: Allow trapping SIGINT/SIGQUIT after ignore because of '&'.

If job control is not enabled, background jobs started with ... & ignore
SIGINT and SIGQUIT so that they are not affected by such signals that are
intended for the foreground job. However, this should not prevent
reassigning a different action for these signals (as if the shell invocation
inherited these signal actions from its parent).

Austin group issue #751

Example:
{ trap - INT; exec sleep 10; } & wait
A Ctrl+C should terminate the sleep command.
/freebsd-11.0-release/bin/sh/
H A Dtrap.cdiff 257399 Wed Oct 30 21:44:36 MDT 2013 jilles sh: Allow trapping SIGINT/SIGQUIT after ignore because of '&'.

If job control is not enabled, background jobs started with ... & ignore
SIGINT and SIGQUIT so that they are not affected by such signals that are
intended for the foreground job. However, this should not prevent
reassigning a different action for these signals (as if the shell invocation
inherited these signal actions from its parent).

Austin group issue #751

Example:
{ trap - INT; exec sleep 10; } & wait
A Ctrl+C should terminate the sleep command.

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