+/* Simulate a server with connections of different speeds. We count
+ * how many connections complete in 10 seconds. */
+#include <ccan/io/io.h>
+#include <ccan/time/time.h>
+#include <ccan/err/err.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <signal.h>
+#include <assert.h>
+
+#define REQUEST_MAX 131072
+#define NUM_CONNS 500 /* per child */
+#define NUM_CHILDREN 2
+
+static unsigned int completed;
+
+struct client {
+ unsigned int len;
+ char *request_buffer;
+};
+
+static struct io_op *write_reply(struct io_conn *conn, struct client *client);
+static struct io_op *read_body(struct io_conn *conn, struct client *client)
+{
+ assert(client->len <= REQUEST_MAX);
+ return io_read(client->request_buffer, client->len,
+ io_next(conn, write_reply, client));
+}
+
+static struct io_op *read_header(struct io_conn *conn, struct client *client)
+{
+ return io_read(&client->len, sizeof(client->len),
+ io_next(conn, read_body, client));
+}
+
+/* once we're done, loop again. */
+static struct io_op *write_complete(struct io_conn *conn, struct client *client)
+{
+ completed++;
+ return read_header(conn, client);
+}
+
+static struct io_op *write_reply(struct io_conn *conn, struct client *client)
+{
+ return io_write(&client->len, sizeof(client->len),
+ io_next(conn, write_complete, client));
+}
+
+/* This runs in the child. */
+static void create_clients(struct sockaddr_un *addr, int waitfd)
+{
+ struct client data;
+ int i, sock[NUM_CONNS], len[NUM_CONNS], done[NUM_CONNS],
+ result[NUM_CONNS], count = 0;
+
+ for (i = 0; i < NUM_CONNS; i++) {
+ len[i] = (random() % REQUEST_MAX) + 1;
+ sock[i] = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sock[i] < 0)
+ err(1, "creating socket");
+ if (connect(sock[i], (void *)addr, sizeof(*addr)) != 0)
+ err(1, "connecting socket");
+ /* Make nonblocking. */
+ fcntl(sock[i], F_SETFD, fcntl(sock[i], F_GETFD)|O_NONBLOCK);
+ done[i] = 0;
+ }
+
+ read(waitfd, &i, 1);
+
+ for (;;) {
+ for (i = 0; i < NUM_CONNS; i++) {
+ int ret, totlen = len[i] + sizeof(len[i]);
+ if (done[i] < sizeof(len[i]) + len[i]) {
+ data.len = len[i];
+ ret = write(sock[i], (void *)&data + done[i],
+ totlen - done[i]);
+ if (ret > 0)
+ done[i] += ret;
+ else if (ret < 0 && errno != EAGAIN)
+ goto fail;
+ } else {
+ int off = done[i] - totlen;
+ ret = read(sock[i], (void *)&result[i] + off,
+ sizeof(result[i]) - off);
+ if (ret > 0) {
+ done[i] += ret;
+ if (done[i] == totlen
+ + sizeof(result[i])) {
+ assert(result[i] == len[i]);
+ count++;
+ done[i] = 0;
+ }
+ } else if (ret < 0 && errno != EAGAIN)
+ goto fail;
+ }
+ }
+ }
+fail:
+ printf("Child did %u\n", count);
+ exit(0);
+}
+
+static int timeout[2];
+static void sigalarm(int sig)
+{
+ write(timeout[1], "1", 1);
+}
+
+static struct io_op *do_timeout(struct io_conn *conn, char *buf)
+{
+ return io_break(conn, NULL);
+}
+
+static struct io_op *do_timeout_read(struct io_conn *conn, char *buf)
+{
+ return io_read(buf, 1, io_next(conn, do_timeout, buf));
+}
+
+int main(int argc, char *argv[])
+{
+ unsigned int i, j;
+ struct sockaddr_un addr;
+ struct timespec start, end;
+ char buffer[REQUEST_MAX];
+ int fd, wake[2];
+ char buf;
+
+ addr.sun_family = AF_UNIX;
+ sprintf(addr.sun_path, "/tmp/run-different-speed.sock.%u", getpid());
+
+ if (pipe(wake) != 0 || pipe(timeout) != 0)
+ err(1, "Creating pipes");
+
+ fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0)
+ err(1, "Creating socket");
+
+ if (bind(fd, (void *)&addr, sizeof(addr)) != 0)
+ err(1, "Binding to %s", addr.sun_path);
+
+ if (listen(fd, NUM_CONNS) != 0)
+ err(1, "Listening on %s", addr.sun_path);
+
+ for (i = 0; i < NUM_CHILDREN; i++) {
+ switch (fork()) {
+ case -1:
+ err(1, "forking");
+ case 0:
+ close(wake[1]);
+ create_clients(&addr, wake[0]);
+ break;
+ }
+ for (j = 0; j < NUM_CONNS; j++) {
+ struct client *client = malloc(sizeof(*client));
+ int ret = accept(fd, NULL, 0);
+ if (ret < 0)
+ err(1, "Accepting fd");
+ /* For efficiency, we share buffer */
+ client->request_buffer = buffer;
+ io_new_conn(ret, read_header, NULL, client);
+ }
+ }
+
+ io_new_conn(timeout[0], do_timeout_read, NULL, &buf);
+
+ close(wake[0]);
+ for (i = 0; i < NUM_CHILDREN; i++)
+ write(wake[1], "1", 1);
+
+ signal(SIGALRM, sigalarm);
+ alarm(10);
+ start = time_now();
+ io_loop();
+ end = time_now();
+ close(fd);
+
+ printf("%u connections complete (%u ns per conn)\n",
+ completed,
+ (int)time_to_nsec(time_divide(time_sub(end, start), completed)));
+ return 0;
+}
projects / ccan / commitdiff