31  * Tests how select() and poll() behave on the selectable file descriptor
47 #include <sys/select.h>
71 	register char *cp, *cmdbuf, *device;  in main()  local
77 	int selectable_fd = -1;  in main()
82 	device = NULL;  in main()
95 	while ((op = getopt(argc, argv, "i:sptnq")) != -1) {  in main()
99 			device = optarg;  in main()
104 			mechanism = "select() and pcap_dispatch()";  in main()
131 		fprintf(stderr, "selpolltest: choose select (-s) or poll (-p), but not both\n");  in main()
135 		fprintf(stderr, "selpolltest: timeout (-t) requires select (-s) or poll (-p)\n");  in main()
138 	if (device == NULL) {  in main()
139 		if (pcap_findalldevs(&devlist, ebuf) == -1)  in main()
143 		device = strdup(devlist->name);  in main()
147 	pd = pcap_open_live(device, 65535, 0, 1000, ebuf);  in main()
152 	if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {  in main()
166 		 * We need either an FD on which to do select()/poll()  in main()
167 		 * or, if there isn't one, a timeout to use in select()/  in main()
171 		if (selectable_fd == -1) {  in main()
173 			    device, mechanism);  in main()
176 				error("select()/poll() isn't supported on %s, even with a timeout",  in main()
177 				    device);  in main()
180 			 * As we won't be notified by select() or poll()  in main()
182 			 * try reading from the device every time the required  in main()
185 			 * so we want to force non-blocking mode.  in main()
189 			printf("Listening on %s, using %s\n", device,  in main()
194 		printf("Listening on %s, using pcap_dispatch()\n", device);  in main()
197 		if (pcap_setnonblock(pd, 1, ebuf) == -1)  in main()
207 			if (selectable_fd != -1) {  in main()
216 				    required_timeout->tv_usec < 1000)  in main()
217 					seltimeout.tv_usec = required_timeout->tv_usec;  in main()
227 			status = select((selectable_fd == -1) ?  in main()
230 			if (status == -1) {  in main()
231 				printf("Select returns error (%s)\n",  in main()
236 						printf("Select timed out: ");  in main()
238 						printf("Select returned a descriptor: ");  in main()
250 				status = pcap_dispatch(pd, -1, countme,  in main()
263 					printf("%d packets seen, %d packets counted after select returns\n",  in main()
279 			    required_timeout->tv_usec >= 1000)  in main()
280 				polltimeout = (int)(required_timeout->tv_usec/1000);  in main()
282 				polltimeout = -1;  in main()
283 			status = poll(&fd, (selectable_fd == -1) ? 0 : 1, polltimeout);  in main()
284 			if (status == -1) {  in main()
312 				status = pcap_dispatch(pd, -1, countme,  in main()
333 			status = pcap_dispatch(pd, -1, countme,  in main()
341 	if (status == -2) {  in main()
350 	if (status == -1) {  in main()
358 	exit(status == -1 ? 1 : 0);  in main()
372 	(void)fprintf(stderr, "Usage: %s [ -sptnq ] [ -i interface ] [expression]\n",  in usage()
389 		if (fmt[-1] != '\n')  in error()
408 		if (fmt[-1] != '\n')  in warning()
440 		dst[-1] = ' ';  in copy_argv()
442 	dst[-1] = '\0';  in copy_argv()