nanosleep and _nanosleep forwarded the result of sceKernelNanosleep, which
returned -1 for a rejected request: errno was never set, and the sce call
returned a value that is not an sce error. A request with negative seconds
was rejected as well, where FreeBSD's kern_nanosleep returns 0 without
sleeping.
nanosleep and _nanosleep now return -1 with errno set to EINVAL when tv_nsec
is outside [0, 1000000000) and to EFAULT for a null request;
sceKernelNanosleep returns the matching SCE_KERNEL_ERROR code. A request
with valid nanoseconds and negative seconds returns 0 at once.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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