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/* 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_plan write_reply(struct io_conn *conn, struct client *client);
static struct io_plan read_body(struct io_conn *conn, struct client *client)
{
assert(client->len <= REQUEST_MAX);
return io_read(client->request_buffer, client->len,
write_reply, client);
}
static struct io_plan io_read_header(struct client *client)
{
return io_read(&client->len, sizeof(client->len), read_body, client);
}
/* once we're done, loop again. */
static struct io_plan write_complete(struct io_conn *conn, struct client *client)
{
completed++;
return io_read_header(client);
}
static struct io_plan write_reply(struct io_conn *conn, struct client *client)
{
return io_write(&client->len, sizeof(client->len),
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_plan do_timeout(struct io_conn *conn, char *buf)
{
return io_break(buf, io_idle());
}
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, io_read_header(client));
}
}
io_new_conn(timeout[0], io_read(&buf, 1, do_timeout, &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;
}
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