lib/syslog-libc.c

   1 /*
   2  * Copyright (c) 2015, 2016 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "syslog-libc.h"
  17
  18 #include <config.h>
  19
  20 #include <string.h>
  21 #include <syslog.h>
  22 #include <unistd.h>
  23
  24 #include "compiler.h"
  25 #include "openvswitch/dynamic-string.h"
  26 #include "socket-util.h"
  27 #include "syslog-provider.h"
  28 #include "util.h"
  29
  30
  31 static void syslog_libc_open(struct syslogger *this, int facility);
  32 static void syslog_libc_log(struct syslogger *this, int pri, const char *msg);
  33
  34 static struct syslog_class syslog_libc_class = {
  35     syslog_libc_open,
  36     syslog_libc_log,
  37 };
  38
  39 struct syslog_libc {
  40     struct syslogger parent;
  41 };
  42
  43
  44 /* This function  creates object that delegate all logging to libc's
  45  * syslog implementation. */
  46 struct syslogger *
  47 syslog_libc_create(void)
  48 {
  49     struct syslog_libc *this = xmalloc(sizeof *this);
  50
  51     this->parent.class = &syslog_libc_class;
  52     this->parent.prefix = "<%B> %D{%h %e %T} %E %A:";
  53
  54     return &this->parent;
  55 }
  56
  57 static void
  58 syslog_libc_open(struct syslogger *this OVS_UNUSED, int facility)
  59 {
  60     static char *ident;
  61
  62     /* openlog() is allowed to keep the pointer passed in, without making a
  63      * copy.  The daemonize code sometimes frees and replaces
  64      * 'program_name', so make a private copy just for openlog().  (We keep
  65      * a pointer to the private copy to suppress memory leak warnings in
  66      * case openlog() does make its own copy.) */
  67     ident = nullable_xstrdup(program_name);
  68
  69     openlog(ident, LOG_NDELAY, facility);
  70 }
  71
  72 static void
  73 syslog_libc_log(struct syslogger *this OVS_UNUSED, int pri, const char *msg)
  74 {
  75     syslog(pri, "%s", msg);
  76 }