22 lines
537 B
C
22 lines
537 B
C
|
/* asyn_cancel() - cancel an asynch operation Author: Kees J. Bot
|
||
|
|
* 7 Jul 1997
|
||
|
|
*/
|
||
|
|
#include "asyn.h"
|
||
|
|
|
||
|
|
int asyn_cancel(asynchio_t *asyn, int fd, int op)
|
||
|
|
/* Cancel an asynchronous operation if one is in progress. (This is easy with
|
||
|
|
* select(2), because no operation is actually happening.)
|
||
|
|
*/
|
||
|
|
{
|
||
|
|
asynfd_t *afd;
|
||
|
|
|
||
|
|
if ((unsigned) fd >= FD_SETSIZE) { errno= EBADF; return -1; }
|
||
|
|
afd= &asyn->asyn_afd[fd];
|
||
|
|
|
||
|
|
if (afd->afd_state[op] == WAITING) {
|
||
|
|
afd->afd_state[op]= IDLE;
|
||
|
|
FD_CLR(fd, &asyn->asyn_fdset[SEL_READ]);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|