[strace/strace] sysvipc handling is time64-incompatible (#116)
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Tue Jan 14 21:39:36 UTC 2020
Now that fix is in progress on the kernel side, what should the action on the strace side be? I think the choices are roughly:
1. Default to using kernel uapi headers with a test for whether they're broken (only needed on x32 and sparc32), falling back to libc ones if so. Users of a libc with time64 will have to ensure they have fixed uapi headers.
2. Default to using libc headers unless arch is 32-bit and time_t is 64-bit. In that case, fallback to kernel uapi headers.
I like approach 1 better because it's semantically correct, and would also work if libc were just using different structures to interface with applications independent of anything to do with time_t. The definitions strace wants here really are the ones defining the ABI between user and kernel space, not between application and libc.
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