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The errno reported in an OpenSSL::SSL::SSLError raised by
SSLSocket#accept and #connect sometimes does not match what SSL_accept()
or SSL_connect() actually encountered. Depending on the evaluation order
of arguments passed to ossl_raise(), errno may be overwritten by
peeraddr_ip_str().
While we could just fix peeraddr_ip_str(), we should avoid passing
around errno since it is error-prone. Replace rb_sys_fail() and
rb_io_{maybe_,}wait_{read,writ}able() with equivalents that do not read
errno.
Remove an unnecessary instance variable lookup and constant lookup. Ruby's public headers provide rb_eSystemCallError.
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The
errnoreported inOpenSSL::SSL::SSLErrormessage sometimes does not match whatSSL_accept()/SSL_connect()actually encountered. Depending on the evaluation order of function arguments toossl_raise(), it can be overwritten bypeeraddr_ip_str().Save
errnointo a local variable immediately after the OpenSSL function returns, and avoid touching the thread-localerrnoafterward.Also, expand
rb_sys_fail()andrb_io_maybe_wait_{readable,writable}()so that they do not rely on errno.