path: root/crt
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authorRich Felker <>2016-01-27 12:23:47 -0500
committerRich Felker <>2016-01-27 12:23:47 -0500
commita5ba2d7507eb6b4388c47f7893e025185496ff90 (patch)
tree0b94153f6f564f75959257a0906e67f3ee6c7cd1 /crt
parent9a3b8f97a160ce292dcf0ef2a9358fa0e11e9ee3 (diff)
improve clock_gettime and adapt it to support slightly-broken vdso
these changes are motivated by a functionally similar patch by Hauke Mehrtens to address the needs of the new mips vdso clock_gettime, which wrongly fails with ENOSYS rather than falling back to making a syscall for clock ids it cannot handle from userspace. in the process of preparing to handle that case, it was noticed that the old clock_gettime use of the vdso was actually wrong with respect to error handling -- the tail call to the vdso function failed to set errno and instead returned an error code. since tail calls to vdso are no longer possible and since the plain syscall code is now needed as a fallback path anyway, it does not make sense to use a function pointer to call the plain syscall code path. instead, it's inlined at the end of the main clock_gettime function. the new code also avoids the need to test for initialization of the vdso function pointer by statically initializing it to a self-init function, and eliminates redundant loads from the volatile pointer object. finally, the use of a_cas_p on an object of type other than void *, which is not permitted aliasing, is replaced by using an object with the correct type and casting the value.
Diffstat (limited to 'crt')
0 files changed, 0 insertions, 0 deletions