int cagetFuZE(char *pvName, char *pvValue) {
RequestT request = get;
OutputT format = plain;
chtype dbrType = -1;
unsigned long reqElems = 0;
int n, result;
pv* pvs;
int i;
unsigned long nElems;
result = ca_context_create(ca_disable_preemptive_callback);
pvs = calloc(1, sizeof(pv));
pvs[0].name = pvName;
connect_pvs(pvs, 1);
for (n = 0; n < 1; n++) {
/* Set up pvs structure */
/* -------------------- */
/* Get natural type and array count */
nElems = ca_element_count(pvs[n].chid);
pvs[n].dbfType = ca_field_type(pvs[n].chid);
pvs[n].dbrType = dbrType;
/* Set up value structures */
if (format != specifiedDbr)
{
pvs[n].dbrType = dbf_type_to_DBR_TIME(pvs[n].dbfType); /* Use native type */
if (dbr_type_is_ENUM(pvs[n].dbrType)) /* Enums honour -n option */
{
if (enumAsNr) pvs[n].dbrType = DBR_TIME_INT;
else pvs[n].dbrType = DBR_TIME_STRING;
}
else if (floatAsString &&
(dbr_type_is_FLOAT(pvs[n].dbrType) || dbr_type_is_DOUBLE(pvs[n].dbrType)))
{
pvs[n].dbrType = DBR_TIME_STRING;
}
}
/* Issue CA request */
/* ---------------- */
if (ca_state(pvs[n].chid) == cs_conn)
{
nConn++;
pvs[n].onceConnected = 1;
if (request == callback)
{
/* Event handler will allocate value and set nElems */
pvs[n].reqElems = reqElems > nElems ? nElems : reqElems;
result = ca_array_get_callback(pvs[n].dbrType,
pvs[n].reqElems,
pvs[n].chid,
event_handler,
(void*)&pvs[n]);
} else {
/* We allocate value structure and set nElems */
pvs[n].nElems = reqElems && reqElems < nElems ? reqElems : nElems;
pvs[n].value = calloc(1, dbr_size_n(pvs[n].dbrType, pvs[n].nElems));
if (!pvs[n].value) {
fprintf(stderr,"Memory allocation failed\n");
return -1;
}
result = ca_array_get(pvs[n].dbrType,
pvs[n].nElems,
pvs[n].chid,
pvs[n].value);
}
pvs[n].status = result;
} else {
pvs[n].status = ECA_DISCONN;
}
}
if (!nConn) return -1; /* No connection? We're done. */
/* Wait for completion */
/* ------------------- */
result = ca_pend_io(caTimeout);
if (result == ECA_TIMEOUT) {
fprintf(stderr, "Read operation timed out: some PV data was not read.\n");
return -1;
}
if (request == callback) /* Also wait for callbacks */
{
if (caTimeout != 0)
{
double slice = caTimeout / PEND_EVENT_SLICES;
for (n = 0; n < PEND_EVENT_SLICES; n++)
{
ca_pend_event(slice);
if (nRead >= nConn) break;
}
if (nRead < nConn) {
fprintf(stderr, "Read operation timed out: some PV data was not read.\n");
return -1;
}
} else {
/* For 0 timeout keep waiting until all are done */
while (nRead < nConn) {
ca_pend_event(1.0);
}
}
}
// Does this kill the connection??
ca_context_destroy();
sprintf(pvValue, "%s\n", val2str(pvs[0].value, pvs[0].dbrType, 0));
return 1;
}
int main (int argc, char *argv[])
{
int i;
int result; /* CA result */
OutputT format = plain; /* User specified format */
RequestT request = get; /* User specified request type */
int isArray = 0; /* Flag for array operation */
int enumAsString = 0; /* Force ENUM values to be strings */
int count = 1;
int opt; /* getopt() current option */
chtype dbrType = DBR_STRING;
char *pend;
EpicsStr *sbuf;
double *dbuf;
char *cbuf = 0;
char *ebuf = 0;
void *pbuf;
int len = 0;
int waitStatus;
struct dbr_gr_enum bufGrEnum;
int nPvs; /* Number of PVs */
pv* pvs; /* Array of PV structures */
LINE_BUFFER(stdout); /* Configure stdout buffering */
putenv("POSIXLY_CORRECT="); /* Behave correct on GNU getopt systems */
while ((opt = getopt(argc, argv, ":cnlhatsS#:w:p:F:")) != -1) {
switch (opt) {
case 'h': /* Print usage */
usage();
return 0;
case 'n': /* Force interpret ENUM as index number */
enumAsNr = 1;
enumAsString = 0;
break;
case 's': /* Force interpret ENUM as menu string */
enumAsString = 1;
enumAsNr = 0;
break;
case 'S': /* Treat char array as (long) string */
charArrAsStr = 1;
isArray = 0;
break;
case 't': /* Select terse output format */
format = terse;
break;
case 'l': /* Select long output format */
format = all;
break;
case 'a': /* Select array mode */
isArray = 1;
charArrAsStr = 0;
break;
case 'c': /* Select put_callback mode */
request = callback;
break;
case 'w': /* Set CA timeout value */
if(epicsScanDouble(optarg, &caTimeout) != 1)
{
fprintf(stderr, "'%s' is not a valid timeout value "
"- ignored. ('caput -h' for help.)\n", optarg);
caTimeout = DEFAULT_TIMEOUT;
}
break;
case '#': /* Array count */
if (sscanf(optarg,"%d", &count) != 1)
{
fprintf(stderr, "'%s' is not a valid array element count "
"- ignored. ('caput -h' for help.)\n", optarg);
count = 0;
}
break;
case 'p': /* CA priority */
if (sscanf(optarg,"%u", &caPriority) != 1)
{
fprintf(stderr, "'%s' is not a valid CA priority "
"- ignored. ('caget -h' for help.)\n", optarg);
caPriority = DEFAULT_CA_PRIORITY;
}
if (caPriority > CA_PRIORITY_MAX) caPriority = CA_PRIORITY_MAX;
break;
case 'F': /* Store this for output and tool_lib formatting */
fieldSeparator = (char) *optarg;
break;
case '?':
fprintf(stderr,
"Unrecognized option: '-%c'. ('caput -h' for help.)\n",
optopt);
return 1;
case ':':
fprintf(stderr,
"Option '-%c' requires an argument. ('caput -h' for help.)\n",
optopt);
return 1;
default :
usage();
return 1;
}
}
nPvs = argc - optind; /* Remaining arg list are PV names and values */
if (nPvs < 1) {
fprintf(stderr, "No pv name specified. ('caput -h' for help.)\n");
return 1;
}
if (nPvs == 1) {
fprintf(stderr, "No value specified. ('caput -h' for help.)\n");
return 1;
}
nPvs = 1; /* One PV - the rest is value(s) */
epId = epicsEventCreate(epicsEventEmpty); /* Create empty EPICS event (semaphore) */
/* Start up Channel Access */
result = ca_context_create(ca_enable_preemptive_callback);
if (result != ECA_NORMAL) {
fprintf(stderr, "CA error %s occurred while trying "
"to start channel access.\n", ca_message(result));
return 1;
}
/* Allocate PV structure array */
pvs = calloc (nPvs, sizeof(pv));
if (!pvs) {
fprintf(stderr, "Memory allocation for channel structure failed.\n");
return 1;
}
/* Connect channels */
pvs[0].name = argv[optind] ; /* Copy PV name from command line */
result = connect_pvs(pvs, nPvs); /* If the connection fails, we're done */
if (result) {
ca_context_destroy();
return result;
}
/* Get values from command line */
optind++;
if (isArray) {
optind++; /* In case of array skip first value (nr
* of elements) - actual number of values is used */
count = argc - optind;
} else { /* Concatenate the remaining line to one string
* (sucks but is compatible to the former version) */
for (i = optind; i < argc; i++) {
len += strlen(argv[i]);
len++;
}
cbuf = calloc(len, sizeof(char));
if (!cbuf) {
fprintf(stderr, "Memory allocation failed.\n");
return 1;
}
strcpy(cbuf, argv[optind]);
if (argc > optind+1) {
for (i = optind + 1; i < argc; i++) {
strcat(cbuf, " ");
strcat(cbuf, argv[i]);
}
}
if ((argc - optind) >= 1)
count = 1;
argv[optind] = cbuf;
}
sbuf = calloc (count, sizeof(EpicsStr));
dbuf = calloc (count, sizeof(double));
if(!sbuf || !dbuf) {
fprintf(stderr, "Memory allocation failed\n");
return 1;
}
/* ENUM? Special treatment */
if (ca_field_type(pvs[0].chid) == DBR_ENUM) {
/* Get the ENUM strings */
result = ca_array_get (DBR_GR_ENUM, 1, pvs[0].chid, &bufGrEnum);
result = ca_pend_io(caTimeout);
if (result == ECA_TIMEOUT) {
fprintf(stderr, "Read operation timed out: ENUM data was not read.\n");
return 1;
}
if (enumAsNr) { /* Interpret values as numbers */
for (i = 0; i < count; ++i) {
dbuf[i] = epicsStrtod(*(argv+optind+i), &pend);
if (*(argv+optind+i) == pend) { /* Conversion didn't work */
fprintf(stderr, "Enum index value '%s' is not a number.\n",
*(argv+optind+i));
return 1;
}
if (dbuf[i] >= bufGrEnum.no_str) {
fprintf(stderr, "Warning: enum index value '%s' may be too large.\n",
*(argv+optind+i));
}
}
dbrType = DBR_DOUBLE;
} else { /* Interpret values as strings */
for (i = 0; i < count; ++i) {
epicsStrnRawFromEscaped(sbuf[i], sizeof(EpicsStr), *(argv+optind+i), sizeof(EpicsStr));
*( sbuf[i]+sizeof(EpicsStr)-1 ) = '\0';
dbrType = DBR_STRING;
/* Compare to ENUM strings */
for (len = 0; len < bufGrEnum.no_str; len++)
if (!strcmp(sbuf[i], bufGrEnum.strs[len]))
break;
if (len >= bufGrEnum.no_str) {
/* Not a string? Try as number */
dbuf[i] = epicsStrtod(sbuf[i], &pend);
if (sbuf[i] == pend || enumAsString) {
fprintf(stderr, "Enum string value '%s' invalid.\n", sbuf[i]);
return 1;
}
if (dbuf[i] >= bufGrEnum.no_str) {
fprintf(stderr, "Warning: enum index value '%s' may be too large.\n", sbuf[i]);
}
dbrType = DBR_DOUBLE;
}
}
}
} else { /* Not an ENUM */
if (charArrAsStr) {
dbrType = DBR_CHAR;
ebuf = calloc(len, sizeof(char));
if(!ebuf) {
fprintf(stderr, "Memory allocation failed\n");
return 1;
}
count = epicsStrnRawFromEscaped(ebuf, len, cbuf, len-1) + 1;
} else {
for (i = 0; i < count; ++i) {
epicsStrnRawFromEscaped(sbuf[i], sizeof(EpicsStr), *(argv+optind+i), sizeof(EpicsStr));
*( sbuf[i]+sizeof(EpicsStr)-1 ) = '\0';
}
dbrType = DBR_STRING;
}
}
/* Read and print old data */
if (format != terse) {
printf("Old : ");
result = caget(pvs, nPvs, format, 0, 0);
}
/* Write new data */
if (dbrType == DBR_STRING) pbuf = sbuf;
else if (dbrType == DBR_CHAR) pbuf = ebuf;
else pbuf = dbuf;
if (request == callback) {
/* Use callback version of put */
pvs[0].status = ECA_NORMAL; /* All ok at the moment */
result = ca_array_put_callback (
dbrType, count, pvs[0].chid, pbuf, put_event_handler, (void *) pvs);
} else {
/* Use standard put with defined timeout */
result = ca_array_put (dbrType, count, pvs[0].chid, pbuf);
}
result = ca_pend_io(caTimeout);
if (result == ECA_TIMEOUT) {
fprintf(stderr, "Write operation timed out: Data was not written.\n");
return 1;
}
if (request == callback) { /* Also wait for callbacks */
waitStatus = epicsEventWaitWithTimeout( epId, caTimeout );
if (waitStatus)
fprintf(stderr, "Write callback operation timed out\n");
/* retrieve status from callback */
result = pvs[0].status;
}
if (result != ECA_NORMAL) {
fprintf(stderr, "Error occured writing data.\n");
return 1;
}
/* Read and print new data */
if (format != terse)
printf("New : ");
result = caget(pvs, nPvs, format, 0, 0);
/* Shut down Channel Access */
ca_context_destroy();
return result;
}
