#ifndef _CHILD_H
#define _CHILD_H

#ifdef __cplusplus
extern "C" {
#endif


#define MAX_CHILDREN 32
#define MAX_CHILD_GROUPS 4


extern int child_debug;

/* we have a circular refernce here */
struct child_info_t;

typedef void (*child_fp_t)(struct child_info_t *, void *);

typedef struct child_info_t {
   int pid;
   int ppid;
   int number;
   child_fp_t child_fp;
} child_info_t;

/* The following should really be kept in shared memory */
typedef struct {
   int nchildren;   /* number in table, not number running */
   int minchildren;
   int maxchildren;
   int activechildren;
   child_info_t child[MAX_CHILDREN];
} child_group_info_t;

typedef struct {
   int ngroups;
   child_group_info_t *group[MAX_CHILD_GROUPS];
} child_groups_t;

void child_create(
   child_info_t *child_info_p,
   child_fp_t child_fp, 
   void *private_p 
);


child_info_t *child_lookup_by_pid(
   const child_groups_t *child_groups_p,
   int pid
);

int child_group_create(
   child_group_info_t *children_info_p, 
   const int min, 
   const int max, 
   const child_fp_t child_fp, 
   void *private_p 
);

extern int child_restart_children;

extern void child_groups_keepalive(
   const child_groups_t *child_groups_p
);

extern int child_group_signal(
   child_group_info_t *children_info_p, 
   int signal
);

extern int child_groups_signal(
   const child_groups_t *child_groups_p,
   int signal
);

extern int child_groups_kill(
   const child_groups_t *child_groups_p
);

extern int child_pipeve(
   const char *cmdpath,  /* full path to command */
   char * const argv[],   /* Array of pointers to arguments */
   char * const envp[],   /* Array of pointers to environment vars*/
   int *stdin_fd_p,      /* Output: fd for stdin pipe */
   int *stdout_fd_p,     /* Output: fd for stdout pipe */
   int *stderr_fd_p,     /* Output: fd for stderr pipe */
   int wait              /* wait for program termination */
);

extern void child_print_arg_array(char *name, char * const array[]);


extern void child_init();
extern void child_term();

#ifdef __cplusplus
}
#endif

#endif  /* _CHILD_H */