simple code for testing select behaviour on MacOSX

seltest.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/select.h>

int main(int argc, char *argv[])
{
	int nfds = (argc > 1) ? atoi(argv[1]) : 0;

	struct timeval tval;
	tval.tv_usec = 100 * 1000;
	tval.tv_sec = 0;

	if( select(nfds, NULL, NULL, NULL, &tval) < 0 ) {
		printf("select NULL failed: %s.\n", strerror(errno));
	}

	fd_set readSet, writeSet;
	FD_ZERO( &readSet);
	FD_ZERO( &writeSet);

	if( select(nfds, &readSet, &writeSet, NULL, &tval) < 0 ) {
		printf("select ZERO failed: %s.\n", strerror(errno));
	}
	printf("finito\n");
	return 0;
}