mail: tests: reset signal disposition before testing

As a good citizen of the OS, mail(1) won't try to catch signals that
were ignored when it started and it won't reconfigure its signal mask
unless

mail: tests: reset signal disposition before testing

As a good citizen of the OS, mail(1) won't try to catch signals that
were ignored when it started and it won't reconfigure its signal mask
unless it's going to try and handle a signal. The test should start
mail(1) off in a well-known state for the signal that it's trying to
test in order to get the behavior that's desired.

No functional change, just improves the resilience of the test.

Reviewed by: des
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D50599

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mail: Add test cases for SIGHUP.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D50296

mail: Further refine the SIGINT test.

* Wait at least 1-2 s before sending the second SIGINT.
* If the child is still running after 15 s, send a SIGKILL.
* Improve the exit status checks.

Fixes: 5

mail: Further refine the SIGINT test.

* Wait at least 1-2 s before sending the second SIGINT.
* If the child is still running after 15 s, send a SIGKILL.
* Improve the exit status checks.

Fixes: 59597032c948
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D50092

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mail: Exit non-zero on failure to collect mail.

While here, avoid non-portable `pipe2()` in the regression test.

Fixes: 59597032c948
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: kevans

mail: Exit non-zero on failure to collect mail.

While here, avoid non-portable `pipe2()` in the regression test.

Fixes: 59597032c948
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D50069

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mail: Don't trap signals we shouldn't.

When in interactive mode, trap SIGINT, SIGHUP, and tty-related signals.
Otherwise, leave signals untouched as required by POSIX.

MFC after: 1 week
Sponsored b

mail: Don't trap signals we shouldn't.

When in interactive mode, trap SIGINT, SIGHUP, and tty-related signals.
Otherwise, leave signals untouched as required by POSIX.

MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D50011

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