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jrnmaint.c
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jrnmaint.c
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/***************************************************************************/
/* */
/* Program name: JRNMAINT */
/* Author: Mark Phillips */
/* Function: Automate jrn maintenance in IBM MQ for IBM i */
/* */
/* Parameters: argv[1] - char [10] - Queue manager name */
/* argv[2] - char [6] - Output type (*PRINT / *MSGQ) */
/* argv[3] - char [4] - Delete receivers (*YES / *NO) */
/* */
/* Copyright (c) 2003,2024 IBM Corp. */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.*/
/* See the License for the specific language governing permissions and */
/* limitations under the License. */
/* */
/***************************************************************************/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <stddef.h>
#include <qjournal.h>
#include <qusec.h>
#include <qusrtvus.h>
#include <qmhsndm.h>
#include <ledate.h>
/***************************************************************************/
/* Constants used by this program */
/***************************************************************************/
#undef TRUE
#define TRUE 1
#undef FALSE
#define FALSE 0
#undef OK
#define OK 0
#define ERR_ARGUMENTS_ERROR 1 /* List of error codes */
#define ERR_QMGR_LIB_NOT_FOUND 2 /* returned from main */
#define ERR_USER_SPACE_MISSING 3
#define ERR_MEMORY_ERROR 4
#define ERR_RETRIEVE_JRN_INF 5
#define MAX_CHAIN 256 /* (Arbitrary) max. no of receivers in chain */
#define JRN_NAME "AMQAJRN " /* Journal name */
#define SPC_NAME "AMQJRNINF " /* User Space Name */
/***************************************************************************/
/* Function prototypes */
/***************************************************************************/
int GetReceiverChain(char* LibName, int *NumRcvrs,
Qjo_JN_Repeating_Key_1_Output_t *pRcvDirectory) ;
void output(char *print_buffer); /* Print data with a timestamp */
/***************************************************************************/
/* Structure defining format of AMQJRNINF user space */
/***************************************************************************/
struct {
char JrnName[20]; /* Journal + library name */
char CC[2]; /* Year (century) */
char YY[2]; /* Year */
char MM[2]; /* Month */
char DD[2]; /* Day */
char HH[2]; /* Hours */
char mm[2]; /* Minutes */
char SS[2]; /* Seconds */
char mmm[3]; /* Milliseconds */
} OldestJrnEntry;
/***************************************************************************/
/* Global variables */
/***************************************************************************/
int print_output = TRUE;
char message_queue[20];
int delete_receivers = FALSE;
Qus_EC_t ErrorData = { sizeof(Qus_EC_t), 0};
/***************************************************************************/
/* M A I N F U N C T I O N */
/***************************************************************************/
int main(int argc, char **argv)
{
int retcode = OK,
NumRcvrs = 0,
count = 0,
deletecount = 0,
foundOldest = FALSE,
deleteReceivers = FALSE,
oldestReceiverIndex = 0,
outputMessages = FALSE;
char cmdbuffer[200],
print_buffer[200],
QmgrLib[10], /* Blank padded Qmgr library name */
szQmgrLib[11], /* NULL terminated Qmgr lib. name */
*p,
TimeStamp[13],
AmqJrnIinfUsrSpc[20];
Qjo_JN_Repeating_Key_1_Output_t *pRcvDirectory = 0,
*pTempRcvr = 0;
printf("\n\n");
output("*****************************************************");
output("* Starting JrnMaint journal maintenance program *");
output("*****************************************************");
/*************************************************************************/
/* Check parameters & queue manager library are valid & exit if not */
/*************************************************************************/
if (argc != 4 ) {
printf("ERROR: Invalid Arguments - pass a 10 character "
"Queue manager library name, \n");
retcode = ERR_ARGUMENTS_ERROR;
return retcode;
}
/*************************************************************************/
/* Set up blank padded & null terminated qmgr names and convert to */
/* upper case */
/*************************************************************************/
memcpy(QmgrLib, argv[1], 10);
for (p = QmgrLib; count<10 ; p++, count++) { /* Upper case name */
*p = toupper(*p);
};
memcpy(szQmgrLib, QmgrLib, 10);
p = strchr(szQmgrLib, ' '); /* Find trailing spaces */
if (p) *p = '\0'; /* and strip them off */
memcpy(AmqJrnIinfUsrSpc, SPC_NAME, 10); /* Setup user space name */
memcpy( &(AmqJrnIinfUsrSpc[10]), QmgrLib, 10);
/*************************************************************************/
/* Set ouput and deletion flags according to arguments 2 and 3 */
/*************************************************************************/
if ( ! memcmp(argv[2], "*PRINT", 6)) {
print_output = TRUE;
}
else {
print_output = FALSE;
memcpy( message_queue, "QMQMMSG ", 10);
memcpy( &(message_queue[10]), QmgrLib, 10);
}
if ( ! memcmp(argv[3], "*YES", 4)) /* Delete receivers? */
delete_receivers = TRUE;
else
delete_receivers = FALSE;
/*************************************************************************/
/* Check queue manager library exists */
/*************************************************************************/
sprintf(cmdbuffer, "CHKOBJ %s *LIB", szQmgrLib );
if (system(cmdbuffer)) { /* Check library exists */
printf("ERROR: Queue manager library %1.10s not found\n", szQmgrLib );
retcode = ERR_QMGR_LIB_NOT_FOUND;
return retcode;
}
/*************************************************************************/
/* Get the timestamp of the oldest jrn entry from the AMQJRNINF *USRSPC */
/*************************************************************************/
ErrorData.Bytes_Available = 0;
ErrorData.Bytes_Provided = sizeof(Qus_EC_t);
QUSRTVUS( AmqJrnIinfUsrSpc, 1, sizeof(OldestJrnEntry),
(char*)&OldestJrnEntry, &ErrorData);
/*************************************************************************/
/* If we didn't find the user space we can't go any further. */
/*************************************************************************/
if ( ErrorData.Bytes_Available != OK) {
printf("ERROR: Journal user space (%s) not found in library %s. "
"Error code: %7.7s\n", SPC_NAME, szQmgrLib,
ErrorData.Exception_Id);
retcode = ERR_USER_SPACE_MISSING;
return retcode;
};
/*************************************************************************/
/* Turn the timestamp into CYYMMDDHHMMSS so can compare it wih the rcvrs */
/*************************************************************************/
if (OldestJrnEntry.CC[0] == '1')
TimeStamp[0] = '0'; /* 20th century */
else
TimeStamp[0] = '1'; /* 21st century */
sprintf( &(TimeStamp[1]), "%2.2s%2.2s%2.2s%2.2s%2.2s%2.2s",
OldestJrnEntry.YY, OldestJrnEntry.MM, OldestJrnEntry.DD,
OldestJrnEntry.HH, OldestJrnEntry.mm, OldestJrnEntry.SS);
/*************************************************************************/
/* Allocate the memory for rcvr data */
/*************************************************************************/
pRcvDirectory = (Qjo_JN_Repeating_Key_1_Output_t*)
calloc(sizeof(Qjo_JN_Repeating_Key_1_Output_t), MAX_CHAIN);
if (! pRcvDirectory ) {
printf("ERROR: Out of memory when allocating pRcvDirectory\n");
retcode = ERR_MEMORY_ERROR;
return retcode;
};
/*************************************************************************/
/* Issue call to get the receiver chain */
/*************************************************************************/
retcode = GetReceiverChain(QmgrLib, &NumRcvrs, pRcvDirectory);
/*************************************************************************/
/* If we got the data OK... */
/*************************************************************************/
if (retcode == OK) {
sprintf(print_buffer, "Timestamp of oldest journal entry: (%13.13s)",
TimeStamp);
output(print_buffer);
/***********************************************************************/
/* Loop through the receivers in the receiver chain starting from the */
/* newest, looking for receivers that we can delete */
/***********************************************************************/
for (count=NumRcvrs-1; count >= 0 ;count--) {
pTempRcvr = &(pRcvDirectory[count]);
/*********************************************************************/
/* If this receiver was attached BEFORE the oldest journal entry... */
/*********************************************************************/
if ( memcmp(pTempRcvr->Jrn_Rcv_Att_Date_Time, TimeStamp,
sizeof(TimeStamp) ) < 0 ) {
/*******************************************************************/
/* If we haven't yet found the oldest receiver, yet then this must */
/* be the oldest receiver we need to keep on the system */
/*******************************************************************/
if ( foundOldest == FALSE ) {
foundOldest = TRUE;
oldestReceiverIndex = count;
sprintf(print_buffer,
"Keeping receiver: %10.10s attached at: %13.13s",
pTempRcvr->Jrn_Rcv_Name,
pTempRcvr->Jrn_Rcv_Att_Date_Time);
output(print_buffer);
sprintf(print_buffer,
"** %10.10s is the oldest *JRNRCV that we need to keep **",
pTempRcvr->Jrn_Rcv_Name);
output(print_buffer);
/*****************************************************************/
/* If we're really deleting receivers we need to jump out of */
/* this loop and drop into the next one to do the deletes */
/*****************************************************************/
if ( delete_receivers == TRUE ) {
break;
};
}
/*******************************************************************/
/* ...else, we've already seen the oldest journal receiver in the */
/* chain, but we're still in this loop... we're therefore not */
/* actually deleting receivers - just report this one as eligible */
/* for deletion */
/*******************************************************************/
else {
sprintf(print_buffer,
"Receiver %10.10s attached at: %13.13s can be deleted",
pTempRcvr->Jrn_Rcv_Name,
pTempRcvr->Jrn_Rcv_Att_Date_Time);
output(print_buffer);
};
}
/*********************************************************************/
/* Else this receiver was attached AFTER the oldest journal entry. */
/*********************************************************************/
else {
sprintf(print_buffer,
"Keeping receiver: %10.10s attached at: %13.13s",
pTempRcvr->Jrn_Rcv_Name,
pTempRcvr->Jrn_Rcv_Att_Date_Time);
output(print_buffer);
};
}; /* End first for loop */
/***********************************************************************/
/* If we're actually deleting receivers, then they must be deleted */
/* oldest first. So now we loop through starting from the oldest, */
/* deleting all the receivers older than the one we need to keep */
/***********************************************************************/
if ( delete_receivers == TRUE && foundOldest == TRUE ) {
for (count=0; count < oldestReceiverIndex ;count++) {
pTempRcvr = &(pRcvDirectory[count]);
sprintf(print_buffer,
"Deleting Receiver %10.10s attached at: %13.13s",
pTempRcvr->Jrn_Rcv_Name,
pTempRcvr->Jrn_Rcv_Att_Date_Time);
output(print_buffer);
/*******************************************************************/
/* Set up delete command and delete receiver */
/*******************************************************************/
memset( cmdbuffer, 0, sizeof(cmdbuffer) );
sprintf( cmdbuffer, "DLTJRNRCV %s/%10.10s DLTOPT(*IGNINQMSG)",
szQmgrLib, pTempRcvr->Jrn_Rcv_Name);
retcode = system(cmdbuffer);
if ( retcode ) {
printf("ERROR: %d from DLTJRNRCV. See job log for details\n",
retcode );
break;
};
deletecount++;
};
};
};
/*************************************************************************/
/* Finished - Free the receiver directory if it was allocated */
/*************************************************************************/
sprintf(print_buffer,
"JrnMaint finished - %d receiver(s) have been deleted.",
deletecount);
output(print_buffer);
if (pRcvDirectory) {
free(pRcvDirectory);
}
return retcode;
}
/***************************************************************************/
/* Function: output() */
/* */
/* Description: Print messages preceded by a timestamp or send to */
/* the queue manager message queue depending on the */
/* OUTPUT() options specified */
/* */
/***************************************************************************/
void output(char *print_buffer)
{
char localdatetime[23];
_INT4 days;
_FLOAT8 secs;
_FEEDBACK fb;
CEELOCT(&days, &secs, localdatetime, &fb);
if (print_output) {
printf("%2.2s:%2.2s:%2.2s-%s \n",
&localdatetime[8], /* Hours */
&localdatetime[10], /* Minutes */
&localdatetime[12], /* Seconds */
print_buffer);
}
else {
ErrorData.Bytes_Available = 0;
ErrorData.Bytes_Provided = sizeof(Qus_EC_t);
QMHSNDM( " ",
" ",
print_buffer,
strlen(print_buffer),
"*INFO ",
message_queue,
1,
" ",
" ",
&ErrorData);
/***********************************************************************/
/* Report errors from send message */
/***********************************************************************/
if ( ErrorData.Bytes_Available ) {
printf("ERROR: %7.7s from QMHSNDM\n",
&(ErrorData.Exception_Id) );
};
};
}
/***************************************************************************/
/* */
/* Function: GetReceiverChain */
/* */
/* Description: Get the list of receivers in the current journal */
/* receiver chain */
/* */
/* Parameters: JName - 10 byte journal library name */
/* NumRcvrs - Number of receivers returned */
/* pRcvDirectory - The buffer of journal receiver data */
/* */
/***************************************************************************/
int GetReceiverChain(char* LibName, int *NumRcvrs,
Qjo_JN_Repeating_Key_1_Output_t *pRcvDirectory)
{
Qjo_RJRN0100_t *pRtnJrnInf;
int retcode = OK;
long JrnDataLen = 0;
char *JrnData,
JrnName[20], /* Jrn name (10) followed by lib name (10) */
print_buffer[200];
Qjo_JN_Repeating_Key_Fields_t *pKeyFld1Hdr =
(Qjo_JN_Repeating_Key_Fields_t*)0;
Qjo_JN_Key_1_Output_Section_t *pKeyFld1OutputHdr =
(Qjo_JN_Key_1_Output_Section_t*)0;
Qjo_JN_Repeating_Key_1_Output_t *pKeyFld1Data =
(Qjo_JN_Repeating_Key_1_Output_t*)0;
struct KData {
_INT4 KeyCount; /* Count of all keys (=1) */
_INT4 Len; /* Length of this key (=12) */
_INT4 KeyID; /* Key ID (=1) */
_INT4 DataLen; /* Length of data (=0) */
} KeyData = {1,12,1,0};
/*************************************************************************/
/* Set up the qualified journal name */
/*************************************************************************/
memcpy(JrnName, JRN_NAME,10);
memcpy(&(JrnName[10]), LibName,10);
/*************************************************************************/
/* Set up the size of the receiver variable - all the headers */
/* plus the buffer for rcvrs */
/*************************************************************************/
JrnDataLen = sizeof(Qjo_RJRN0100_t) +
sizeof(Qjo_JN_Repeating_Key_Fields_t) +
sizeof(Qjo_JN_Key_1_Output_Section_t) +
sizeof(Qjo_RRCV0100_t) * MAX_CHAIN ;
JrnData = (char*)malloc(JrnDataLen);
if ( ! JrnData ) {
printf("ERROR: Memory allocation error (JrnData)\n");
retcode = ERR_MEMORY_ERROR;
};
/*************************************************************************/
/* Get the journal receiver chain */
/*************************************************************************/
if (retcode == OK) {
ErrorData.Bytes_Available = 0;
ErrorData.Bytes_Provided = sizeof(Qus_EC_t);
QjoRetrieveJournalInformation(JrnData, &JrnDataLen,
JrnName, QJO_RTV_JRN_INFO_0100,
(char*)&KeyData, &ErrorData);
/***********************************************************************/
/* Print error data if the command failed */
/***********************************************************************/
if ( ErrorData.Bytes_Available ) {
printf("ERROR: %7.7s from QjoRetrieveJournalInformation\n",
&(ErrorData.Exception_Id) );
if ((ErrorData.Bytes_Available - sizeof(ErrorData)) > 0)
printf("- Error data:", (char*)&ErrorData + sizeof(ErrorData),
ErrorData.Bytes_Available - sizeof(ErrorData));
retcode = ERR_RETRIEVE_JRN_INF;
};
};
/*************************************************************************/
/* if the API completed successfully, report the basic journal data */
/*************************************************************************/
if (retcode == OK) {
pRtnJrnInf = (Qjo_RJRN0100_t*)JrnData;
/***********************************************************************/
/* Set up the receiver directory return fields */
/* The journal receiver list is returned at the end of a list of */
/* chained structures - unscramble the jrnrcvr directory data */
/***********************************************************************/
pKeyFld1Hdr = (Qjo_JN_Repeating_Key_Fields_t*)
((char*)JrnData + sizeof(Qjo_RJRN0100_t));
pKeyFld1OutputHdr = (Qjo_JN_Key_1_Output_Section_t*)
((char*)pKeyFld1Hdr +
pKeyFld1Hdr->Off_Strt_Key_Info);
pKeyFld1Data = (Qjo_JN_Repeating_Key_1_Output_t*)
((char*)pKeyFld1OutputHdr +
sizeof(Qjo_JN_Key_1_Output_Section_t));
*NumRcvrs = pKeyFld1Hdr->Number_Entries;
sprintf(print_buffer,
"Processing %d receivers for AMQAJRN in %10.10s",
*NumRcvrs, LibName );
output(print_buffer);
if (*NumRcvrs > MAX_CHAIN) {
sprintf(print_buffer,
"WARNING - More than %d receivers found"
" - not all will be processed", MAX_CHAIN );
output(print_buffer);
*NumRcvrs= MAX_CHAIN;
};
memcpy(pRcvDirectory, (void*)pKeyFld1Data,
*NumRcvrs * sizeof(Qjo_JN_Repeating_Key_1_Output_t));
/***********************************************************************/
/* Trace some of the returned data */
/***********************************************************************/
sprintf(print_buffer, "Attached receiver name: %10.10s",
pRtnJrnInf->Att_Jrn_Rcv_Name );
output(print_buffer);
}; /* End if retcode == OK */
/*************************************************************************/
/* Free the storage used to retrieve the data */
/*************************************************************************/
if (JrnData) {
free(JrnData);
};
return retcode;
}