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/*++
/* NAME
/* master_proto 3h
/* SUMMARY
/* master process protocol
/* SYNOPSIS
/* #include <master_proto.h>
/* DESCRIPTION
/* .nf
/*
* Transport names. The master passes the transport name on the command
* line, and thus the name is part of the master to child protocol.
*/
#define MASTER_XPORT_NAME_UNIX "unix" /* local IPC */
#define MASTER_XPORT_NAME_FIFO "fifo" /* local IPC */
#define MASTER_XPORT_NAME_INET "inet" /* non-local IPC */
#define MASTER_XPORT_NAME_PASS "pass" /* local IPC */
#define MASTER_XPORT_NAME_UXDG "unix-dgram" /* local IPC */
/*
* Format of a status message sent by a child process to the process
* manager. Since this is between processes on the same machine we need not
* worry about byte order and word length.
*/
typedef struct MASTER_STATUS {
int pid; /* process ID */
unsigned gen; /* child generation number */
int avail; /* availability */
} MASTER_STATUS;
#define MASTER_GEN_NAME "GENERATION" /* passed via environment */
#define MASTER_STAT_TAKEN 0 /* this one is occupied */
#define MASTER_STAT_AVAIL 1 /* this process is idle */
extern int master_notify(int, unsigned, int); /* encapsulate status msg */
/*
* File descriptors inherited from the master process. The flow control pipe
* is read by receive processes and is written to by send processes. If
* receive processes get too far ahead they will pause for a brief moment.
*/
#define MASTER_FLOW_READ 3
#define MASTER_FLOW_WRITE 4
/*
* File descriptors inherited from the master process. All processes that
* provide a given service share the same status file descriptor, and listen
* on the same service socket(s). The kernel decides what process gets the
* next connection. Usually the number of listening processes is small, so
* one connection will not cause a "thundering herd" effect. When no process
* listens on a given socket, the master process will. MASTER_LISTEN_FD is
* actually the lowest-numbered descriptor of a sequence of descriptors to
* listen on.
*/
#define MASTER_STATUS_FD 5 /* shared channel to parent */
#define MASTER_LISTEN_FD 6 /* accept connections here */
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
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