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#include "sysdeps.h"
#include <fcntl.h>
#include <unistd.h>
#include "trigger.h"
/** Set up a trigger for polling.
*
* The passed \c iopoll_fd must have at least two slots, as the second
* slot may be required in the event the OS exhibits the "named pipe
* bug". This function must be called every time the trigger is pulled
* to reset the trigger's state.
*/
int trigger_set(iopoll_fd* io, const char* path)
{
if (io[0].fd > 0)
close(io[0].fd);
#ifdef HASNAMEDPIPEBUG
if (io[1].fd > 0)
close(io[1].fd);
#endif
if ((io[0].fd = open(path, O_RDONLY | O_NDELAY)) == -1)
return 0;
io[0].events = IOPOLL_READ;
io[0].revents = 0;
#ifdef HASNAMEDPIPEBUG
if ((io[1].fd = open(path, O_WRONLY | O_NDELAY)) == -1)
return 0;
#else
io[1].fd = -1;
#endif
io[1].events = 0;
io[1].revents = 0;
return 1;
}
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