ngx_log_errno    1021 core/ngx_conf_file.c         p = ngx_log_errno(p, last, err);
ngx_log_errno     129 core/ngx_log.c         p = ngx_log_errno(p, last, err);
ngx_log_errno     221 core/ngx_log.c         p = ngx_log_errno(p, last, err);
ngx_log_errno     203 core/ngx_log.h u_char *ngx_log_errno(u_char *buf, u_char *last, ngx_err_t err);