lib/daemon.h

   1 /*
   2  * Copyright (c) 2008 Nicira Networks.
   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
  17 #ifndef DAEMON_H
  18 #define DAEMON_H 1
  19
  20 #include <limits.h>
  21 #include <stdbool.h>
  22 #include <sys/types.h>
  23
  24 enum {
  25     OPT_DETACH = UCHAR_MAX + 2048,
  26     OPT_NO_CHDIR,
  27     OPT_OVERWRITE_PIDFILE,
  28     OPT_PIDFILE,
  29 };
  30
  31 #define DAEMON_LONG_OPTIONS                                          \
  32         {"detach",            no_argument, 0, OPT_DETACH},           \
  33         {"no-chdir",          no_argument, 0, OPT_NO_CHDIR},         \
  34         {"pidfile",           optional_argument, 0, OPT_PIDFILE},    \
  35         {"overwrite-pidfile", no_argument, 0, OPT_OVERWRITE_PIDFILE}
  36
  37 #define DAEMON_OPTION_HANDLERS                  \
  38         case OPT_DETACH:                        \
  39             set_detach();                       \
  40             break;                              \
  41                                                 \
  42         case OPT_NO_CHDIR:                      \
  43             set_no_chdir();                     \
  44             break;                              \
  45                                                 \
  46         case OPT_PIDFILE:                       \
  47             set_pidfile(optarg);                \
  48             break;                              \
  49                                                 \
  50         case OPT_OVERWRITE_PIDFILE:             \
  51             ignore_existing_pidfile();          \
  52             break;
  53
  54 char *make_pidfile_name(const char *name);
  55 void set_pidfile(const char *name);
  56 const char *get_pidfile(void);
  57 void set_no_chdir(void);
  58 void set_detach(void);
  59 void daemonize(void);
  60 void die_if_already_running(void);
  61 void ignore_existing_pidfile(void);
  62 void daemon_usage(void);
  63 pid_t read_pidfile(const char *name);
  64
  65 #endif /* daemon.h */