www.nico.schottelius.org/software/cinit/browse_source/cinit-0.0.5/cinit.h

/* 
 * cinit
 * (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
 * header of cinit
 */

/* includes */
#include <sys/types.h>  /* pid_t */
#include "config.h"     /* paths, socket options, etc. */

/* limits: will be obsolete in cinit-1.0 */
#define MAX_SVC    510 /* maximum services - defines size of array - may later be obsoleted */
#define MAX_DEPS    32 /* maximum direct dependencies of a service */
#define BUFSIZE   4096

/* paths */
#define C_ONARG   C_ON  C_PARAMS
#define C_OFFARG  C_OFF C_PARAMS
#define C_ONENV   C_ON  C_ENV
#define C_OFFENV  C_OFF C_ENV

#define SLASH     "/"

#define CINIT_INIT CINIT_DIR SLASH C_INIT
#define CINIT_TMNT CINIT_DIR SLASH C_TMP
#define CINIT_SOCK CINIT_TMNT SLASH C_SOCK

/* commands (maximum: 2^8 = 256)*/
#define CMD_START_SVC   0
#define CMD_CHG_STATUS  1
#define CMD_STOP_SVC    2
#define CMD_KILL_SVC    3

#define CMD_RESCUE      251
#define CMD_INIT        252

#define CMD_HALT        253
#define CMD_REBOOT      254
#define CMD_POWEROFF    255

/* status of a service */
#define ST_TMP       1        /* currently working on it */
#define ST_ONCE      2        /* executed once */
#define ST_RESPAWN   3        /* running and respawning */
#define ST_FAIL      4        /* failed to start service */

/* actions for i/o handlers (see comm/do_*) */
#define ACT_SERV     0
#define ACT_CLIENT   1

/* Messages to the outside */

#define MSG_ERR_FORK      "fork"
#define MSG_ERR_EXECVE    "execve"
#define MSG_ERR_ALLOC     "memory allocation"
#define MSG_ERR_UMOUNT    "umount"
#define MSG_TERMKILL      "sigterm"
#define MSG_KILLBILL      "sigkill"

/* array of svc - not needed anymore 
struct svc {
   char *abs_path;      * service identifier *
   char status;         * tmp, respawn, ran once *
   pid_t pid;           * pid of the process *
};

struct svcl {
   struct svc svca[MAX_SVC];
   int process;
};
*/

// extern struct  svcl svc_list;
struct listitem {
   char *abs_path;
   int status;
   pid_t pid;
   struct listitem *before;
   struct listitem *after;
};


/* variables */
extern struct listitem *list;
extern int     sock, logfd;

/* functions (used by server and client) */
void  cerr(char *string, int status);
int  run_svc(char *rpath);
void mini_printf(char *str, int fd);
void set_signals(int action);
#define LOG(s) mini_printf(s,logfd)

int do_start_svc(int sock2, char *svc, int action);
int do_change_status(char *svc, char *status, pid_t *pid, int sock2, int action);
char do_result(int sock2, char *value);

/* server functions */
/* int  chk_svc(char *svc);
int  add_mod_svc(char *svc, char status, pid_t pid); */
int list_insert(char *path, int status);
struct listitem *list_search(char *path);
int list_delete(char *path);
int  run_init_svc(void);
void sigio(int signal);
void sig_reboot(int signal);
void panic(void);

/* client / message functions */
int msg_start_svc(char *svc);
int msg_change_status(char *svc, char status, pid_t pid);
int begin_msg(char cmd);

/* client functions */
int run_run_svcs(char *abspath);
pid_t exec_svc(char *abspath, int on);
pid_t respawn_svc(char *abspath);
int connect_sock(int socke);
char **read_file(char *file);

/* listing functions (server only) */

int list_insert(char *path, int status);
struct listitem *list_search(char *path);
int list_delete(char *path);
int list_modify(char *path, int new_status, pid_t new_pid);


/* DEBUG */
#ifdef DEBUG
# define D_PRINTF(x)  ( printf("[%s:%d]: %s\n",__FILE__,__LINE__,x) )
#else 
# define D_PRINTF(x)  if(0)
#endif

/* Messages to the outside */