SSL_ERROR_SYSCALL  650 event/ngx_event_openssl.c     err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
SSL_ERROR_SYSCALL  856 event/ngx_event_openssl.c     err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
SSL_ERROR_SYSCALL 1107 event/ngx_event_openssl.c     err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
SSL_ERROR_SYSCALL 1238 event/ngx_event_openssl.c     err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
SSL_ERROR_SYSCALL 1281 event/ngx_event_openssl.c     if (sslerr == SSL_ERROR_SYSCALL) {