| 5807f35c | 05-May-2023 |
Dag-Erling Smørgrav <[email protected]> |
dd: Fix SIGINT handling.
Currently, we handle SIGINT by calling summary() and _exit() directly from the signal handler, which we install after setup(). There are several issues with this:
* summar
dd: Fix SIGINT handling.
Currently, we handle SIGINT by calling summary() and _exit() directly from the signal handler, which we install after setup(). There are several issues with this:
* summary() is not signal safe;
* the parent is not informed about the signal;
* setup() can block on open(), and catching SIGINT at that stage will produce the correct exit status but will not print anything to stderr as POSIX demands.
Fix this by making SIGINT non-restartable, changing our signal handler to only set a flag, installing it before setup(), and checking the termination flag before and after every blocking operation, i.e. open(), read(), write().
Also add two test cases, one for catching SIGINT while opening the input and one for catching it while reading. I couldn't think of an easy way to test catching SIGINT while writing (it's certainly feasible, but perhaps not from a shell script).
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: cracauer, ngie, imp
Differential Revision: https://reviews.freebsd.org/D39641
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| 07c19c27 | 03-Jun-2017 |
Alan Somers <[email protected]> |
Fix bin/dd/dd2_tests:seek_overflow on UFS and TMPFS
Split the postive and negative parts into separate test cases. The positive
test case can only run on ZFS, because only ZFS supports files that l
Fix bin/dd/dd2_tests:seek_overflow on UFS and TMPFS
Split the postive and negative parts into separate test cases. The positive
test case can only run on ZFS, because only ZFS supports files that large.
PR: 219757
Reported by: ngie
MFC after: 18 days
X-MFC-with: 319339
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