static int handle_client(int client_fd)
{
int status;
size_t size, nitems;
FILE *serial_file;
char buf[1024]; /* buffer for serial IO */
CapCommand cmd;
char ruser[64], rhost[64], realhost[64];
double rate, time;
fd_set rd_fds;
struct timeval timeout, now, *timeoutPtr;
int recording = 0;
double recordNow = 0.;
double recordNext = 0.;
double recordPeriod = 0.;
double recordDelta = 0.;
#ifdef _WIN32
int ms;
#endif
while (1)
{
FD_ZERO(&rd_fds);
FD_SET(client_fd, &rd_fds);
if ( !recording ) {
timeoutPtr = NULL;
} else {
/* record and schedule the next recording */
#ifdef LINUX
gettimeofday(&now, NULL);
#else
gettimeofday(&now);
#endif
recordNow = toDouble(now);
if ( recordNext == 0.0 ) /* The first record */
recordNext = recordNow;
while ( recordNext <= recordNow ) {
get_data(client_fd);
recordNext = recordNext + recordPeriod;
}
timeout = toTimeval( recordNext - recordNow );
timeoutPtr = &timeout;
}
/*
* wait for commands or a timeout
*/
#ifndef _WIN32
status = select(FD_SETSIZE, &rd_fds, NULL, NULL, timeoutPtr);
#else
/* Should really use CapWaitTimeout when possible */
ms = -1;
if (timeoutPtr)
ms = timeoutPtr->tv_sec*1000 + timeoutPtr->tv_usec/1000;
status = CapWaitTimeout(client_fd, ms);
#endif
if (status < 0 ) {
if (errno == EINTR) {
/* Ignore signals and try again */
continue;
}
/* Otherwise, give a fatal error message */
CapError(client_fd, CAP_SEV_FATAL, gProgramName, "select failed");
CapError(client_fd, CAP_SEV_FATAL, "select", NULL);
exit(1);
}
else if (status == 0) {
/* Try again */
continue;
}
/* There is data on the client file descriptor */
cmd = CapGetCommand(client_fd);
switch (cmd) {
case CAP_CMD_QUIT:
return 0;
case CAP_CMD_AUTHORIZE:
status = CapGetAuthInfo(client_fd, ruser, rhost, realhost);
if (status < 0)
{
return -1;
}
/*
* If user@host is not authorized to use this server then:
*
* status = CapAuthorize(client_fd, 0);
*/
status = CapAuthorize(client_fd, 1);
break;
case CAP_CMD_INIT: /* Initial client/server handshake */
status = CapInitialize(client_fd, gProgramName);
break;
case CAP_CMD_VERSION: /* Send version information */
status = CapVersion(client_fd, gProgramName, "1.0",
"Extern server (example) - v1.0");
break;
case CAP_CMD_INFO:
if (NULL == gChannels)
{
/* Only create the channel data once */
gChannels = create_channels(gConfigFile, client_fd);
if ( NULL == gChannels)
{
status = CapError(client_fd, CAP_SEV_ERROR,
gProgramName,
"Missing or empty config file");
}
}
/* Return the recording information. gMaxRecordRate <= 0.
* says recording is not supported
*/
{
size_t buf_size = 0;
if ( 0. < gMaxRecordRate)
buf_size = INT_MAX;
status = CapInfo(client_fd, gMinRecordRate,
gMaxRecordRate, gDefRecordRate,
buf_size, 1);
}
break;
case CAP_CMD_DATA: /* Send frame data */
if (!recording )
get_data(client_fd);
status = CapData(client_fd);
break;
case CAP_CMD_START_RECORD: /* Start recording */
rate = CapGetRequestedRecordRate(client_fd);
size = CapGetRequestedRecordSize(client_fd);
/*
* Set up for recording operations
*/
if (rate < gMinRecordRate )
rate = gMinRecordRate;
else if (rate > gMaxRecordRate )
rate = gMaxRecordRate;
status = CapStartRecord(client_fd, rate, size);
if (status != -1)
{
recordPeriod = 1.0 / rate;
recordNext = 0.;
recording = 1;
}
break;
case CAP_CMD_STOP_RECORD: /* Stop recording */
status = CapStopRecord(client_fd);
recording = 0;
break;
default: /* Ignore unknown commands */
status = CapError(client_fd, CAP_SEV_ERROR, gProgramName,
"Unknown server command.");
break;
}
if (status < 0)
{
return -1;
}
}
/* return 0; */
}
static int handle_client(int client_fd)
{
int status;
CapCommand cmd;
char ruser[64], rhost[64], realhost[64];
fd_set rd_fds;
struct timeval base_timeout, timeout;
int recording = 0;
static int channels_created = 0;
base_timeout.tv_sec = 1;
base_timeout.tv_usec = 0;
while (1)
{
FD_ZERO(&rd_fds);
FD_SET((unsigned int)client_fd, &rd_fds);
timeout.tv_sec = base_timeout.tv_sec;
timeout.tv_usec = base_timeout.tv_usec;
status = select(FD_SETSIZE, &rd_fds, NULL, NULL, &timeout);
if (status < 0)
{
#ifndef _WIN32
if (errno == EINTR)
{
/* Ignore signals and try again */
continue;
}
#endif /*WIN32*/
/* Otherwise, give a fatal error message */
CapError(client_fd, CAP_SEV_FATAL, program, "select failed");
CapError(client_fd, CAP_SEV_FATAL, "select", NULL);
exit(1);
}
else if (status == 0)
{
/* We got a timeout */
if (recording) get_data(client_fd);
/* Try again */
continue;
}
else
{
/* There is data on the client file descriptor */
cmd = CapGetCommand(client_fd);
switch (cmd)
{
case CAP_CMD_QUIT:
return 0;
#ifdef _WIN32
case CAP_CMD_ERROR:
return -1;
#endif
case CAP_CMD_AUTHORIZE:
status = CapGetAuthInfo(client_fd, ruser, rhost, realhost);
if (status < 0)
{
return -1;
}
/*
* If user@host is not authorized to use this server then:
*
* status = CapAuthorize(client_fd, 0);
*/
status = CapAuthorize(client_fd, 1);
break;
case CAP_CMD_INIT: /* Initial client/server handshake */
status = CapInitialize(client_fd, program);
break;
case CAP_CMD_VERSION: /* Send version information */
status = CapVersion(client_fd, program, "1.0",
"Clock capture server - v1.0");
break;
case CAP_CMD_INFO:
if (!channels_created)
{
/* Only create the channel data once */
status = create_channels(client_fd);
if (status < 0)
{
break;
}
channels_created = 1;
}
#ifdef SERVER_SIDE_RECORDING
/* The server side recording returns incorrect time in
* the current version
*/
status = CapInfo(client_fd, 1.0, 100.0, 10.0, 512 * 1024, 1);
#else
status = CapInfo(client_fd, 0.0, 0.0, 0.0, 512 * 1024, 1);
#endif
break;
case CAP_CMD_DATA: /* Send frame data */
get_data(client_fd);
status = CapData(client_fd);
break;
#ifdef SERVER_SIDE_RECORDING
/* The server side recording returns incorrect time in
* the current version
*/
case CAP_CMD_START_RECORD: /* Start recording */
{
int size = 0;
float rate = 0.0f, time = 0.0f;
rate = CapGetRequestedRecordRate(client_fd);
size = CapGetRequestedRecordSize(client_fd);
/* Convert rate in Hz to a timeout value in a timeval structure */
if (rate < 1.0) rate = 1.0;
if (rate > 100.0) rate = 100.0;
time = 1.0 / rate;
base_timeout.tv_sec = time;
base_timeout.tv_usec = (time - base_timeout.tv_sec) * 1000000;
status = CapStartRecord(client_fd, rate, size);
if (status != -1)
{
recording = 1;
}
break;
}
case CAP_CMD_STOP_RECORD: /* Stop recording */
status = CapStopRecord(client_fd);
recording = 0;
base_timeout.tv_sec = 1;
base_timeout.tv_usec = 0;
break;
#endif /* server side recording */
default: /* Ignore unknown commands */
status = CapError(client_fd, CAP_SEV_ERROR, program,
"Unknown server command.");
break;
}
if (status < 0)
{
return -1;
}
}
}
/* return 0; */
}
