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master.h
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master.h
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#ifndef HAVE_MASTER_H
#define HAVE_MASTER_H
#include <config.h>
#include <sys/resource.h> /* for rlim_t */
#include "libconfig.h" /* for config_dir and IMAPOPT_SYNC_MACHINEID */
#include "strarray.h"
/* needed for possible SNMP monitoring */
struct service {
char *name; /* name of service */
char *listen; /* port/socket to listen to */
char *proto; /* protocol to accept */
strarray_t *exec; /* command (with args) to execute */
int babysit; /* babysit this service? */
/* multiple address family support */
int associate; /* are we primary or additional instance? */
int family; /* address family */
const char *familyname; /* address family name */
/* communication info */
int socket; /* client/child communication channel */
int stat[2]; /* master/child communication channel */
/* limits */
int desired_workers; /* num child processes to have ready */
int max_workers; /* max num child processes to spawn */
rlim_t maxfds; /* max num file descriptors to use */
unsigned int maxforkrate; /* max rate to spawn children */
/* stats */
int ready_workers; /* num child processes ready for service */
int nforks; /* num child processes spawned */
int nactive; /* num children servicing clients */
int nconnections; /* num connections made to children */
double forkrate; /* rate at which we're spawning children */
int nreadyfails; /* number of failures in READY state */
/* fork rate computation */
struct timeval last_interval_start;
unsigned int interval_forks;
};
extern struct service *Services;
extern int nservices;
/*
* Description of multiple address family support from
* Hajimu UMEMOTO <ume@mahoroba.org>:
*
* In service_create(), master tries to listen each address family which
* getaddrinfo() returns. With existing implementation of getaddrinfo(),
* when a protocol is not specified exactly by proto= in cyrus.conf and a
* platform supports an IPv4 and an IPv6, getaddrinfo() returns two
* struct addrinfo chain which contain INADDR_ANY (0.0.0.0; IPv4) and
* IN6ADDR_ANY (::; IPv6), then master will listen an IPv4 and an IPv6.
*
* As a result, one SERVICE entry in cyrus.conf may correspond to two
* Service memory blocks; one is for an IPv6 and the other is for an
* IPv4. The associate field was introduced to intend to distinguish
* whether the entry is primary or not. The associate field of primary
* block is 0, 2nd is 1, 3rd is 2, ...
* The blocks share same memory area of name, listen and proto.
*
* +----------------+
* | Service[i] |
* | associate: 0 |
* | name | --------------> name
* | listen | ----- /- -----> listen
* | proto | ---- /- / ----> proto
* +----------------+ / / /
* | Service[j] | / / /
* | associate: 1 | / / /
* | name |--/ / /
* | listen |----/ /
* | proto |-----/
* +----------------+
*
* This field is intended to avoid duplicate free by doing free only when
* associate is zero.
*
*/
#endif /* HAVE_MASTER_H */

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