libevent ioevent benchmark never closes its socketpairs

[OneBucket126]

Summary

All socketpairs are stored in pipes, but the benchmark reaches exit(0) without calling evutil_closesocket() for either endpoint.

Affected code

• Repository commit: 477033f938fd47dfecde43c82257cd286d9fa38e
• File: benchmark/ioevent/libevent/libevent_ioevent_bench.c
• Original scanner location: line 189

Evidence

Source: benchmark/ioevent/libevent/libevent_ioevent_bench.c lines 175-194

 175: 
 176: 	events = calloc(num_pipes, sizeof(struct event));
 177: 	pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t));
 178: 	if (events == NULL || pipes == NULL) {
 179: 		perror("malloc");
 180: 		exit(1);
 181: 	}
 182: 
 183: 	event_init();
 184: 
 185: 	for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
 186: #ifdef USE_PIPES
 187: 		if (pipe(cp) == -1) {
 188: #else
 189: 		if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
 190: #endif
 191: 			perror("pipe");
 192: 			exit(1);
 193: 		}
 194: 	}

Source: benchmark/ioevent/libevent/libevent_ioevent_bench.c lines 196-208

 196:     long sum = 0;
 197: 	for (i = 0; i < 25; i++) {
 198: 		tv = run_once();
 199: 		if (tv == NULL)
 200: 			exit(1);
 201: 		fprintf(stdout, "%ld\n",
 202: 			tv->tv_sec * 1000000L + tv->tv_usec);
 203:         sum += tv->tv_sec * 1000000L + tv->tv_usec;
 204: 	}
 205:     fprintf(stdout, "%s Average : %ld\n", argv[0], sum/25);
 206: 
 207: 	exit(0);
 208: }

Impact

The default run leaves 200 descriptors open, and -n can make the leak large enough to hit descriptor limits during setup or wrapper-driven repeated runs.