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BUG: Fixed polling capability of WaitForData.

This commit is contained in:
Brad King 2005-06-17 13:57:27 -04:00
parent 4b5559fa2e
commit 9fd4560ba2
1 changed files with 28 additions and 18 deletions
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46
Source/kwsys/ProcessUNIX.c
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@ -103,6 +103,7 @@ static int kwsysProcessSetupOutputPipeFile(int* p, const char* name);
static int kwsysProcessGetTimeoutTime(kwsysProcess* cp, double* userTimeout,
kwsysProcessTime* timeoutTime);
static int kwsysProcessGetTimeoutLeft(kwsysProcessTime* timeoutTime,
double* userTimeout,
kwsysProcessTimeNative* timeoutLength);
static kwsysProcessTime kwsysProcessTimeGetCurrent(void);
static double kwsysProcessTimeToDouble(kwsysProcessTime t);
@ -858,6 +859,22 @@ int kwsysProcess_WaitForData(kwsysProcess* cp, char** data, int* length,
anyway). */
FD_ZERO(&cp->PipeSet);
/* Setup a timeout if required. */
if(timeoutTime.tv_sec < 0)
{
timeout = 0;
}
else
{
timeout = &timeoutLength;
}
if(kwsysProcessGetTimeoutLeft(&timeoutTime, user?userTimeout:0, &timeoutLength))
{
/* Timeout has already expired. */
expired = 1;
break;
}
/* Add the pipe reading ends that are still open. */
max = -1;
for(i=0; i < KWSYSPE_PIPE_COUNT; ++i)
@ -879,22 +896,6 @@ int kwsysProcess_WaitForData(kwsysProcess* cp, char** data, int* length,
break;
}
/* Setup a timeout if required. */
if(timeoutTime.tv_sec < 0)
{
timeout = 0;
}
else
{
timeout = &timeoutLength;
}
if(kwsysProcessGetTimeoutLeft(&timeoutTime, &timeoutLength))
{
/* Timeout has already expired. */
expired = 1;
break;
}
/* Run select to block until data are available. Repeat call
until it is not interrupted. */
while(((numReady = select(max+1, &cp->PipeSet, 0, 0, timeout)) < 0) &&
@ -1468,8 +1469,9 @@ static int kwsysProcessGetTimeoutTime(kwsysProcess* cp, double* userTimeout,
kwsysProcessTime currentTime = kwsysProcessTimeGetCurrent();
kwsysProcessTime userTimeoutLength = kwsysProcessTimeFromDouble(*userTimeout);
kwsysProcessTime userTimeoutTime = kwsysProcessTimeAdd(currentTime,
userTimeoutLength);
if(kwsysProcessTimeLess(userTimeoutTime, *timeoutTime))
userTimeoutLength);
if(timeoutTime->tv_sec < 0 ||
kwsysProcessTimeLess(userTimeoutTime, *timeoutTime))
{
*timeoutTime = userTimeoutTime;
return 1;
@ -1482,6 +1484,7 @@ static int kwsysProcessGetTimeoutTime(kwsysProcess* cp, double* userTimeout,
/* Get the length of time before the given timeout time arrives.
Returns 1 if the time has already arrived, and 0 otherwise. */
static int kwsysProcessGetTimeoutLeft(kwsysProcessTime* timeoutTime,
double* userTimeout,
kwsysProcessTimeNative* timeoutLength)
{
if(timeoutTime->tv_sec < 0)
@ -1495,6 +1498,13 @@ static int kwsysProcessGetTimeoutLeft(kwsysProcessTime* timeoutTime,
kwsysProcessTime currentTime = kwsysProcessTimeGetCurrent();
kwsysProcessTime timeLeft = kwsysProcessTimeSubtract(*timeoutTime,
currentTime);
if(timeLeft.tv_sec < 0 && userTimeout && *userTimeout <= 0)
{
/* Caller has explicitly requested a zero timeout. */
timeLeft.tv_sec = 0;
timeLeft.tv_usec = 0;
}
if(timeLeft.tv_sec < 0)
{
/* Timeout has already expired. */