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-rw-r--r--unix/tclUnixChan.c55
1 files changed, 30 insertions, 25 deletions
diff --git a/unix/tclUnixChan.c b/unix/tclUnixChan.c
index 3c6adb5..0ae41c4 100644
--- a/unix/tclUnixChan.c
+++ b/unix/tclUnixChan.c
@@ -3195,12 +3195,21 @@ TclUnixWaitForFile(fd, mask, timeout)
{
Tcl_Time abortTime = {0, 0}, now; /* silence gcc 4 warning */
struct timeval blockTime, *timeoutPtr;
- int index, numFound, result = 0;
- fd_mask bit;
- fd_mask readyMasks[3*MASK_SIZE];
- /* This array reflects the readable/writable
- * conditions that were found to exist by the
- * last call to select. */
+ int numFound, result = 0;
+ fd_set readableMask;
+ fd_set writableMask;
+ fd_set exceptionalMask;
+
+#ifndef _DARWIN_C_SOURCE
+ /*
+ * Sanity check fd.
+ */
+
+ if (fd >= FD_SETSIZE) {
+ Tcl_Panic("TclUnixWaitForFile can't handle file id %d", fd);
+ /* must never get here, or select masks overrun will occur below */
+ }
+#endif
/*
* If there is a non-zero finite timeout, compute the time when
@@ -3225,15 +3234,12 @@ TclUnixWaitForFile(fd, mask, timeout)
}
/*
- * Initialize the ready masks and compute the mask offsets.
+ * Initialize the select masks.
*/
- if (fd >= FD_SETSIZE) {
- panic("TclWaitForFile can't handle file id %d", fd);
- }
- memset((VOID *) readyMasks, 0, 3*MASK_SIZE*sizeof(fd_mask));
- index = fd/(NBBY*sizeof(fd_mask));
- bit = ((fd_mask) 1) << (fd%(NBBY*sizeof(fd_mask)));
+ FD_ZERO(&readableMask);
+ FD_ZERO(&writableMask);
+ FD_ZERO(&exceptionalMask);
/*
* Loop in a mini-event loop of our own, waiting for either the
@@ -3255,34 +3261,33 @@ TclUnixWaitForFile(fd, mask, timeout)
}
/*
- * Set the appropriate bit in the ready masks for the fd.
+ * Setup the select masks for the fd.
*/
- if (mask & TCL_READABLE) {
- readyMasks[index] |= bit;
+ if (mask & TCL_READABLE) {
+ FD_SET(fd, &readableMask);
}
- if (mask & TCL_WRITABLE) {
- (readyMasks+MASK_SIZE)[index] |= bit;
+ if (mask & TCL_WRITABLE) {
+ FD_SET(fd, &writableMask);
}
if (mask & TCL_EXCEPTION) {
- (readyMasks+2*(MASK_SIZE))[index] |= bit;
+ FD_SET(fd, &exceptionalMask);
}
/*
* Wait for the event or a timeout.
*/
- numFound = select(fd+1, (SELECT_MASK *) &readyMasks[0],
- (SELECT_MASK *) &readyMasks[MASK_SIZE],
- (SELECT_MASK *) &readyMasks[2*MASK_SIZE], timeoutPtr);
+ numFound = select(fd + 1, &readableMask, &writableMask,
+ &exceptionalMask, timeoutPtr);
if (numFound == 1) {
- if (readyMasks[index] & bit) {
+ if (FD_ISSET(fd, &readableMask)) {
result |= TCL_READABLE;
}
- if ((readyMasks+MASK_SIZE)[index] & bit) {
+ if (FD_ISSET(fd, &writableMask)) {
result |= TCL_WRITABLE;
}
- if ((readyMasks+2*(MASK_SIZE))[index] & bit) {
+ if (FD_ISSET(fd, &exceptionalMask)) {
result |= TCL_EXCEPTION;
}
result &= mask;