LXR busybox/sysklogd/syslogd_and

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * prioritynames[] and facilitynames[]
   4 *
   5 * Copyright (C) 2008 by Denys Vlasenko <vda.linux@gmail.com>
   6 *
   7 * Licensed under GPLv2, see file LICENSE in this source tree.
   8 */
   9#include "libbb.h"
  10#include "common_bufsiz.h"
  11#define SYSLOG_NAMES
  12#define SYSLOG_NAMES_CONST
  13#include <syslog.h>
  14
  15#if 0
  16/* For the record: with SYSLOG_NAMES <syslog.h> defines
  17 * (not declares) the following:
  18 */
  19typedef struct _code {
  20        /*const*/ char *c_name;
  21        int c_val;
  22} CODE;
  23/*const*/ CODE prioritynames[] = {
  24    { "alert", LOG_ALERT },
  25...
  26    { NULL, -1 }
  27};
  28/* same for facilitynames[] */
  29
  30/* This MUST occur only once per entire executable,
  31 * therefore we can't just do it in syslogd.c and logger.c -
  32 * there will be two copies of it.
  33 *
  34 * We cannot even do it in separate file and then just reference
  35 * prioritynames[] from syslogd.c and logger.c - bare <syslog.h>
  36 * will not emit extern decls for prioritynames[]! Attempts to
  37 * emit "matching" struct _code declaration defeat the whole purpose
  38 * of <syslog.h>.
  39 *
  40 * For now, syslogd.c and logger.c are simply compiled into
  41 * one object file.
  42 */
  43#endif
  44
  45/* musl decided to be funny and it implements these as giant defines
  46 * of the form: ((CODE *)(const CODE []){ ... })
  47 * Which works, but causes _every_ function using them
  48 * to have a copy on stack (at least with gcc-6.3.0).
  49 * If we reference them just once, this saves 150 bytes.
  50 * The pointers themselves are optimized out
  51 * (no size change on uclibc).
  52 */
  53static const CODE *const bb_prioritynames = prioritynames;
  54static const CODE *const bb_facilitynames = facilitynames;
  55
  56
  57#if ENABLE_SYSLOGD
  58#include "syslogd.c"
  59#endif
  60
  61#if ENABLE_LOGGER
  62#include "logger.c"
  63#endif
  64