libs/nixio/src/syslog.c

   1 /*
   2  * nixio - Linux I/O library for lua
   3  *
   4  *   Copyright (C) 2009 Steven Barth <steven@midlink.org>
   5  *
   6  *  Licensed under the Apache License, Version 2.0 (the "License");
   7  *  you may not use this file except in compliance with the License.
   8  *  You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  *  Unless required by applicable law or agreed to in writing, software
  13  *  distributed under the License is distributed on an "AS IS" BASIS,
  14  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  *  See the License for the specific language governing permissions and
  16  *  limitations under the License.
  17  */
  18
  19 #include "nixio.h"
  20 #include <string.h>
  21 #include <syslog.h>
  22
  23
  24 static int nixio_openlog(lua_State *L) {
  25         int option = 0, facility = LOG_USER;
  26
  27         const char *ident = luaL_optstring(L, 1, "nixio");
  28         const int j = lua_gettop(L);
  29         for (int i=2; i<=j; i++) {
  30                 const char *flag = luaL_checkstring(L, i);
  31                 if (!strcmp(flag, "cons")) {
  32                         option |= LOG_CONS;
  33                 } else if (!strcmp(flag, "nowait")) {
  34                         option |= LOG_NOWAIT;
  35                 } else if (!strcmp(flag, "pid")) {
  36                         option |= LOG_PID;
  37                 } else if (!strcmp(flag, "perror")) {
  38                         option |= LOG_PERROR;
  39                 } else if (!strcmp(flag, "ndelay")) {
  40                         option |= LOG_NDELAY;
  41                 } else if (!strcmp(flag, "odelay")) {
  42                         option |= LOG_ODELAY;
  43                 } else {
  44                         return luaL_argerror(L, i,
  45                                 "supported values: cons, nowait, pid, perror, ndelay, odelay");
  46                 }
  47         }
  48
  49         openlog(ident, option, facility);
  50         return 0;
  51 }
  52
  53 static int nixio_closelog(lua_State *L) {
  54         closelog();
  55         return 0;
  56 }
  57
  58 static int nixio__syslogmasg(lua_State *L, int dolog) {
  59         int priority;
  60
  61         const char *flag = luaL_checkstring(L, 1);
  62         if (!strcmp(flag, "emerg")) {
  63                 priority = LOG_EMERG;
  64         } else if (!strcmp(flag, "alert")) {
  65                 priority = LOG_ALERT;
  66         } else if (!strcmp(flag, "crit")) {
  67                 priority = LOG_CRIT;
  68         } else if (!strcmp(flag, "err")) {
  69                 priority = LOG_ERR;
  70         } else if (!strcmp(flag, "warning")) {
  71                 priority = LOG_WARNING;
  72         } else if (!strcmp(flag, "notice")) {
  73                 priority = LOG_NOTICE;
  74         } else if (!strcmp(flag, "info")) {
  75                 priority = LOG_INFO;
  76         } else if (!strcmp(flag, "debug")) {
  77                 priority = LOG_DEBUG;
  78         } else {
  79                 return luaL_argerror(L, 1, "supported values: emerg, alert, crit, err, "
  80                                 "warning, notice, info, debug");
  81         }
  82
  83         if (dolog) {
  84                 const char *msg = luaL_checkstring(L, 2);
  85                 syslog(priority, msg);
  86         } else {
  87                 setlogmask(LOG_UPTO(priority));
  88         }
  89         return 0;
  90 }
  91
  92 static int nixio_setlogmask(lua_State *L) {
  93         return nixio__syslogmasg(L, 0);
  94 }
  95
  96 static int nixio_syslog(lua_State *L) {
  97         return nixio__syslogmasg(L, 1);
  98 }
  99
 100 /* module table */
 101 static const luaL_reg R[] = {
 102         {"openlog",             nixio_openlog},
 103         {"syslog",              nixio_syslog},
 104         {"setlogmask",  nixio_setlogmask},
 105         {"closelog",    nixio_closelog},
 106         {NULL,                  NULL}
 107 };
 108
 109 void nixio_open_syslog(lua_State *L) {
 110         luaL_register(L, NULL, R);
 111 }