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/*++
/* NAME
/* qmgr_scan 3
/* SUMMARY
/* queue scanning
/* SYNOPSIS
/* #include "qmgr.h"
/*
/* QMGR_SCAN *qmgr_scan_create(queue_name)
/* const char *queue_name;
/*
/* char *qmgr_scan_next(scan_info)
/* QMGR_SCAN *scan_info;
/*
/* void qmgr_scan_request(scan_info, flags)
/* QMGR_SCAN *scan_info;
/* int flags;
/* DESCRIPTION
/* This module implements queue scans. A queue scan always runs
/* to completion, so that all files get a fair chance. The caller
/* can request that a queue scan be restarted once it completes.
/*
/* qmgr_scan_create() creates a context for scanning the named queue,
/* but does not start a queue scan.
/*
/* qmgr_scan_next() returns the base name of the next queue file.
/* A null pointer means that no file was found. qmgr_scan_next()
/* automagically restarts a queue scan when a scan request had
/* arrived while the scan was in progress.
/*
/* qmgr_scan_request() records a request for the next queue scan. The
/* flags argument is the bit-wise OR of zero or more of the following,
/* unrecognized flags being ignored:
/* .IP QMGR_FLUSH_ONCE
/* Forget state information about dead hosts or transports.
/* This request takes effect immediately.
/* .IP QMGR_FLUSH_DFXP
/* Override the defer_transports setting. This takes effect
/* immediately when a queue scan is in progress, and affects
/* the next queue scan.
/* .IP QMGR_SCAN_ALL
/* Ignore queue file time stamps. This takes effect immediately
/* when a queue scan is in progress, and affects the next queue
/* scan.
/* .IP QMGR_SCAN_START
/* Start a queue scan when none is in progress, or restart the
/* current scan upon completion.
/* DIAGNOSTICS
/* Fatal: out of memory.
/* Panic: interface violations, internal consistency errors.
/* 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
/*--*/
/* System library. */
#include <sys_defs.h>
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <scan_dir.h>
/* Global library. */
#include <mail_scan_dir.h>
/* Application-specific. */
#include "qmgr.h"
/* qmgr_scan_start - start queue scan */
static void qmgr_scan_start(QMGR_SCAN *scan_info)
{
const char *myname = "qmgr_scan_start";
/*
* Sanity check.
*/
if (scan_info->handle)
msg_panic("%s: %s queue scan in progress",
myname, scan_info->queue);
/*
* Give the poor tester a clue.
*/
if (msg_verbose)
msg_info("%s: %sstart %s queue scan",
myname,
scan_info->nflags & QMGR_SCAN_START ? "re" : "",
scan_info->queue);
/*
* Start or restart the scan.
*/
scan_info->flags = scan_info->nflags;
scan_info->nflags = 0;
scan_info->handle = scan_dir_open(scan_info->queue);
}
/* qmgr_scan_request - request for future scan */
void qmgr_scan_request(QMGR_SCAN *scan_info, int flags)
{
/*
* Apply "forget all dead destinations" requests immediately. Throttle
* dead transports and queues at the earliest opportunity: preferably
* during an already ongoing queue scan, otherwise the throttling will
* have to wait until a "start scan" trigger arrives.
*
* The QMGR_FLUSH_ONCE request always comes with QMGR_FLUSH_DFXP, and
* sometimes it also comes with QMGR_SCAN_ALL. It becomes a completely
* different story when a flush request is encoded in file permissions.
*/
if (flags & QMGR_FLUSH_ONCE)
qmgr_enable_all();
/*
* Apply "ignore time stamp" requests also towards the scan that is
* already in progress.
*/
if (scan_info->handle != 0 && (flags & QMGR_SCAN_ALL))
scan_info->flags |= QMGR_SCAN_ALL;
/*
* Apply "override defer_transports" requests also towards the scan that
* is already in progress.
*/
if (scan_info->handle != 0 && (flags & QMGR_FLUSH_DFXP))
scan_info->flags |= QMGR_FLUSH_DFXP;
/*
* If a scan is in progress, just record the request.
*/
scan_info->nflags |= flags;
if (scan_info->handle == 0 && (flags & QMGR_SCAN_START) != 0) {
scan_info->nflags &= ~QMGR_SCAN_START;
qmgr_scan_start(scan_info);
}
}
/* qmgr_scan_next - look for next queue file */
char *qmgr_scan_next(QMGR_SCAN *scan_info)
{
char *path = 0;
/*
* Restart the scan if we reach the end and a queue scan request has
* arrived in the mean time.
*/
if (scan_info->handle && (path = mail_scan_dir_next(scan_info->handle)) == 0) {
scan_info->handle = scan_dir_close(scan_info->handle);
if (msg_verbose && (scan_info->nflags & QMGR_SCAN_START) == 0)
msg_info("done %s queue scan", scan_info->queue);
}
if (!scan_info->handle && (scan_info->nflags & QMGR_SCAN_START)) {
qmgr_scan_start(scan_info);
path = mail_scan_dir_next(scan_info->handle);
}
return (path);
}
/* qmgr_scan_create - create queue scan context */
QMGR_SCAN *qmgr_scan_create(const char *queue)
{
QMGR_SCAN *scan_info;
scan_info = (QMGR_SCAN *) mymalloc(sizeof(*scan_info));
scan_info->queue = mystrdup(queue);
scan_info->flags = scan_info->nflags = 0;
scan_info->handle = 0;
return (scan_info);
}
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