Commit 17a81baf authored by Rusty Russell's avatar Rusty Russell

io: io_close_taken_fd to steal fd from conn.

Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent ce27b564
......@@ -79,7 +79,6 @@ void remove_from_always(struct io_conn *conn);
void backend_plan_done(struct io_conn *conn);
void backend_wake(const void *wait);
void backend_del_conn(struct io_conn *conn);
void io_ready(struct io_conn *conn, int pollflags);
void io_do_always(struct io_conn *conn);
......
......@@ -627,6 +627,24 @@ struct io_plan *io_close(struct io_conn *conn);
*/
struct io_plan *io_close_cb(struct io_conn *, void *unused);
/**
* io_close_taken_fd - close a connection, but remove the filedescriptor first.
* @conn: the connection to take the file descriptor from and close,
*
* io_close closes the file descriptor underlying the io_conn; this version does
* not. Presumably you have used io_conn_fd() on it beforehand and will take
* care of the fd yourself.
*
* Example:
* static struct io_plan *steal_fd(struct io_conn *conn, int *fd)
* {
* *fd = io_conn_fd(conn);
* printf("stealing fd %i and closing\n", *fd);
* return io_close_taken_fd(conn);
* }
*/
struct io_plan *io_close_taken_fd(struct io_conn *conn);
/**
* io_loop - process fds until all closed on io_break.
* @timers - timers which are waiting to go off (or NULL for none)
......
......@@ -157,10 +157,11 @@ void backend_wake(const void *wait)
}
}
static void destroy_conn(struct io_conn *conn)
static void destroy_conn(struct io_conn *conn, bool close_fd)
{
int saved_errno = errno;
if (close_fd)
close(conn->fd.fd);
del_fd(&conn->fd);
/* In case it's on always list, remove it. */
......@@ -173,14 +174,26 @@ static void destroy_conn(struct io_conn *conn)
}
}
static void destroy_conn_close_fd(struct io_conn *conn)
{
destroy_conn(conn, true);
}
bool add_conn(struct io_conn *c)
{
if (!add_fd(&c->fd, 0))
return false;
tal_add_destructor(c, destroy_conn);
tal_add_destructor(c, destroy_conn_close_fd);
return true;
}
struct io_plan *io_close_taken_fd(struct io_conn *conn)
{
tal_del_destructor(conn, destroy_conn_close_fd);
destroy_conn(conn, false);
return io_close(conn);
}
static void accept_conn(struct io_listener *l)
{
int fd = accept(l->fd.fd, NULL, NULL);
......
#include <ccan/io/io.h>
/* Include the C files directly. */
#include <ccan/io/poll.c>
#include <ccan/io/io.c>
#include <ccan/tap/tap.h>
#include <sys/wait.h>
#include <stdio.h>
#define PORT "65021"
static struct io_listener *l;
static struct io_plan *steal_fd(struct io_conn *conn, int *fd)
{
io_close_listener(l);
*fd = io_conn_fd(conn);
return io_close_taken_fd(conn);
}
static int make_listen_fd(const char *port, struct addrinfo **info)
{
int fd, on = 1;
struct addrinfo *addrinfo, hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
hints.ai_protocol = 0;
if (getaddrinfo(NULL, port, &hints, &addrinfo) != 0)
return -1;
fd = socket(addrinfo->ai_family, addrinfo->ai_socktype,
addrinfo->ai_protocol);
if (fd < 0)
return -1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(fd, addrinfo->ai_addr, addrinfo->ai_addrlen) != 0) {
close(fd);
return -1;
}
if (listen(fd, 1) != 0) {
close(fd);
return -1;
}
*info = addrinfo;
return fd;
}
int main(void)
{
struct addrinfo *addrinfo = NULL;
int i, fd, in_fd, status;
char buf[strlen("hellothere")];
/* This is how many tests you plan to run */
plan_tests(15);
fd = make_listen_fd(PORT, &addrinfo);
l = io_new_listener(NULL, fd, steal_fd, &in_fd);
fflush(stdout);
if (!fork()) {
io_close_listener(l);
fd = socket(addrinfo->ai_family, addrinfo->ai_socktype,
addrinfo->ai_protocol);
if (fd < 0)
exit(1);
if (connect(fd, addrinfo->ai_addr, addrinfo->ai_addrlen) != 0)
exit(2);
signal(SIGPIPE, SIG_IGN);
for (i = 0; i < strlen("hellothere"); i++) {
if (write(fd, "hellothere" + i, 1) != 1)
break;
}
close(fd);
freeaddrinfo(addrinfo);
exit(0);
}
freeaddrinfo(addrinfo);
ok1(io_loop(NULL, NULL) == NULL);
for (i = 0; i < strlen("hellothere"); i++)
ok1(read(in_fd, buf + i, 1) == 1);
ok1(memcmp(buf, "hellothere", sizeof(buf)) == 0);
ok1(wait(&status));
ok1(WIFEXITED(status));
ok1(WEXITSTATUS(status) == 0);
/* This exits depending on whether all tests passed */
return exit_status();
}
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