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Don't assume that SIGINT and SIGQUIT are set to SIG_DFL at the start
of the test. Instead, retrieve their current dispositions and verify
that they are restored at the end of the test.
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D55709
(cherry picked from commit 48368f702423742b2a7dff7ad3191625e8bf26f0)
system(3): Fix brain glitch in previous commit
We were saving SIGINT twice instead of SIGINT and SIGQUIT.
Also restore original order of operations (SIGINT then SIGQUIT), which
matches the order in which they're discussed in the POSIX description
of system(3).
MFC after: 1 week
Sponsored by: Klara, Inc.
Fixes: 48368f702423 ("system(3): Address test robustness issue")
(cherry picked from commit 863b5c137a98d29dc6964cba0e0c4fe2a8bebab8)
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Our manual page states that if given a null pointer, system() returns
non-zero if the shell is available and zero if it is not. This is
consistent with the C standard's description of system(), but it is not
what we actually do. What we actually do is always return non-zero, as
required by POSIX.
As the POSIX rationale explains, implementing the logic required by the
C standard does not violate POSIX, since a conforming system always has
a shell, therefore the logic will always return non-zero.
Since our libc is commonly used in non-conforming situations such as
chroots or thin jails, we should implement the full logic required by
the C standard.
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: obiwac, bnovkov, kevans
Differential Revision: https://reviews.freebsd.org/D55484
(cherry picked from commit 8ae3f44991948cc97b09adc248a9a46db71bf9e0)
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Replace the somewhat perfunctory NetBSD tests with our own.
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: bnovkov, kevans
Differential Revision: https://reviews.freebsd.org/D55482
(cherry picked from commit 7a1ade5109ac57d1f59eaa75b5d0f13fabecf6ba)
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