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* libsys: don't expose sigwait wrapperBrooks Davis2024-03-131-0/+45
Long ago (e129c18a83ef) __sys_sigwait was wrapped to prevent sigwait() from returning with EINTR. Through a series of changes this wrapper become __libc_sigwait which was internal to libc and used solely in the interposing table. To support a move of sigwait back to libc, move this wrapper into libsys and rename it with an __libsys_ prefix. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D44238