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533 lines (439 loc) · 10.4 KB
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/* Licensed under LGPLv2.1+ - see LICENSE file for details */
#include "io.h"
#include "backend.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
void *io_loop_return;
struct io_alloc io_alloc = {
malloc, realloc, free
};
#ifdef DEBUG
/* Set to skip the next plan. */
bool io_plan_nodebug;
/* The current connection to apply plan to. */
struct io_conn *current;
/* User-defined function to select which connection(s) to debug. */
bool (*io_debug_conn)(struct io_conn *conn);
struct io_plan io_debug(struct io_plan plan)
{
struct io_conn *ready = NULL;
if (io_plan_nodebug) {
io_plan_nodebug = false;
return plan;
}
if (!current || !doing_debug_on(current))
return plan;
current->plan = plan;
backend_plan_changed(current);
/* Call back into the loop immediately. */
io_loop_return = do_io_loop(&ready);
if (ready) {
set_current(ready);
if (!ready->plan.next) {
/* Call finish function immediately. */
if (ready->finish) {
errno = ready->plan.u1.s;
ready->finish(ready, ready->finish_arg);
ready->finish = NULL;
}
backend_del_conn(ready);
} else {
/* Calls back in itself, via io_debug_io(). */
if (ready->plan.io(ready->fd.fd, &ready->plan) != 2)
abort();
}
set_current(NULL);
}
/* Return a do-nothing plan, so backend_plan_changed in
* io_ready doesn't do anything (it's already been called). */
return io_wait_(NULL, (void *)1, NULL);
}
int io_debug_io(int ret)
{
/* Cache it for debugging; current changes. */
struct io_conn *conn = current;
int saved_errno = errno;
if (!doing_debug_on(conn))
return ret;
/* These will all go linearly through the io_debug() path above. */
switch (ret) {
case -1:
/* This will call io_debug above. */
errno = saved_errno;
io_close();
break;
case 0: /* Keep going with plan. */
io_debug(conn->plan);
break;
case 1: /* Done: get next plan. */
if (timeout_active(conn))
backend_del_timeout(conn);
/* In case they call io_duplex, clear our poll flags so
* both sides don't seem to be both doing read or write
* (See assert(!mask || pfd->events != mask) in poll.c) */
conn->plan.pollflag = 0;
conn->plan.next(conn, conn->plan.next_arg);
break;
default:
abort();
}
/* Normally-invalid value, used for sanity check. */
return 2;
}
/* Counterpart to io_plan_no_debug(), called in macros in io.h */
static void io_plan_debug_again(void)
{
io_plan_nodebug = false;
}
#else
static void io_plan_debug_again(void)
{
}
#endif
struct io_listener *io_new_listener_(int fd,
void (*init)(int fd, void *arg),
void *arg)
{
struct io_listener *l = io_alloc.alloc(sizeof(*l));
if (!l)
return NULL;
l->fd.listener = true;
l->fd.fd = fd;
l->init = init;
l->arg = arg;
if (!add_listener(l)) {
io_alloc.free(l);
return NULL;
}
return l;
}
void io_close_listener(struct io_listener *l)
{
close(l->fd.fd);
del_listener(l);
io_alloc.free(l);
}
struct io_conn *io_new_conn_(int fd, struct io_plan plan)
{
struct io_conn *conn = io_alloc.alloc(sizeof(*conn));
io_plan_debug_again();
if (!conn)
return NULL;
conn->fd.listener = false;
conn->fd.fd = fd;
conn->plan = plan;
conn->finish = NULL;
conn->finish_arg = NULL;
conn->duplex = NULL;
conn->timeout = NULL;
if (!add_conn(conn)) {
io_alloc.free(conn);
return NULL;
}
return conn;
}
void io_set_finish_(struct io_conn *conn,
void (*finish)(struct io_conn *, void *),
void *arg)
{
conn->finish = finish;
conn->finish_arg = arg;
}
struct io_conn *io_duplex_(struct io_conn *old, struct io_plan plan)
{
struct io_conn *conn;
io_plan_debug_again();
assert(!old->duplex);
conn = io_alloc.alloc(sizeof(*conn));
if (!conn)
return NULL;
conn->fd.listener = false;
conn->fd.fd = old->fd.fd;
conn->plan = plan;
conn->duplex = old;
conn->finish = NULL;
conn->finish_arg = NULL;
conn->timeout = NULL;
if (!add_duplex(conn)) {
io_alloc.free(conn);
return NULL;
}
old->duplex = conn;
return conn;
}
bool io_timeout_(struct io_conn *conn, struct timelen t,
struct io_plan (*cb)(struct io_conn *, void *), void *arg)
{
assert(cb);
if (!conn->timeout) {
conn->timeout = io_alloc.alloc(sizeof(*conn->timeout));
if (!conn->timeout)
return false;
} else
assert(!timeout_active(conn));
conn->timeout->next = cb;
conn->timeout->next_arg = arg;
backend_add_timeout(conn, t);
return true;
}
/* Always done: call the next thing. */
static int do_always(int fd, struct io_plan *plan)
{
return 1;
}
struct io_plan io_always_(struct io_plan (*cb)(struct io_conn *, void *),
void *arg)
{
struct io_plan plan;
assert(cb);
plan.io = do_always;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLALWAYS;
return plan;
}
/* Returns true if we're finished. */
static int do_write(int fd, struct io_plan *plan)
{
ssize_t ret = write(fd, plan->u1.cp, plan->u2.s);
if (ret < 0)
return io_debug_io(-1);
plan->u1.cp += ret;
plan->u2.s -= ret;
return io_debug_io(plan->u2.s == 0);
}
/* Queue some data to be written. */
struct io_plan io_write_(const void *data, size_t len,
struct io_plan (*cb)(struct io_conn *, void *),
void *arg)
{
struct io_plan plan;
assert(cb);
if (len == 0)
return io_always_(cb, arg);
plan.u1.const_vp = data;
plan.u2.s = len;
plan.io = do_write;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLOUT;
return plan;
}
static int do_read(int fd, struct io_plan *plan)
{
ssize_t ret = read(fd, plan->u1.cp, plan->u2.s);
if (ret <= 0)
return io_debug_io(-1);
plan->u1.cp += ret;
plan->u2.s -= ret;
return io_debug_io(plan->u2.s == 0);
}
/* Queue a request to read into a buffer. */
struct io_plan io_read_(void *data, size_t len,
struct io_plan (*cb)(struct io_conn *, void *),
void *arg)
{
struct io_plan plan;
assert(cb);
if (len == 0)
return io_always_(cb, arg);
plan.u1.cp = data;
plan.u2.s = len;
plan.io = do_read;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLIN;
return plan;
}
static int do_read_partial(int fd, struct io_plan *plan)
{
ssize_t ret = read(fd, plan->u1.cp, *(size_t *)plan->u2.vp);
if (ret <= 0)
return io_debug_io(-1);
*(size_t *)plan->u2.vp = ret;
return io_debug_io(1);
}
/* Queue a partial request to read into a buffer. */
struct io_plan io_read_partial_(void *data, size_t *len,
struct io_plan (*cb)(struct io_conn *, void *),
void *arg)
{
struct io_plan plan;
assert(cb);
if (*len == 0)
return io_always_(cb, arg);
plan.u1.cp = data;
plan.u2.vp = len;
plan.io = do_read_partial;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLIN;
return plan;
}
static int do_write_partial(int fd, struct io_plan *plan)
{
ssize_t ret = write(fd, plan->u1.cp, *(size_t *)plan->u2.vp);
if (ret < 0)
return io_debug_io(-1);
*(size_t *)plan->u2.vp = ret;
return io_debug_io(1);
}
/* Queue a partial write request. */
struct io_plan io_write_partial_(const void *data, size_t *len,
struct io_plan (*cb)(struct io_conn*, void *),
void *arg)
{
struct io_plan plan;
assert(cb);
if (*len == 0)
return io_always_(cb, arg);
plan.u1.const_vp = data;
plan.u2.vp = len;
plan.io = do_write_partial;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLOUT;
return plan;
}
static int already_connected(int fd, struct io_plan *plan)
{
return io_debug_io(1);
}
static int do_connect(int fd, struct io_plan *plan)
{
int err, ret;
socklen_t len = sizeof(err);
/* Has async connect finished? */
ret = getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len);
if (ret < 0)
return -1;
if (err == 0) {
/* Restore blocking if it was initially. */
fcntl(fd, F_SETFD, plan->u1.s);
return 1;
}
return 0;
}
struct io_plan io_connect_(int fd, const struct addrinfo *addr,
struct io_plan (*cb)(struct io_conn*, void *),
void *arg)
{
struct io_plan plan;
assert(cb);
plan.next = cb;
plan.next_arg = arg;
/* Save old flags, set nonblock if not already. */
plan.u1.s = fcntl(fd, F_GETFD);
fcntl(fd, F_SETFD, plan.u1.s | O_NONBLOCK);
/* Immediate connect can happen. */
if (connect(fd, addr->ai_addr, addr->ai_addrlen) == 0) {
/* Dummy will be called immediately. */
plan.pollflag = POLLOUT;
plan.io = already_connected;
} else {
if (errno != EINPROGRESS)
return io_close_();
plan.pollflag = POLLIN;
plan.io = do_connect;
}
return plan;
}
struct io_plan io_wait_(const void *wait,
struct io_plan (*cb)(struct io_conn *, void*),
void *arg)
{
struct io_plan plan;
assert(cb);
plan.pollflag = 0;
plan.io = NULL;
plan.next = cb;
plan.next_arg = arg;
plan.u1.const_vp = wait;
return plan;
}
void io_wake(const void *wait)
{
backend_wait_changed(wait);
}
void io_ready(struct io_conn *conn)
{
/* Beware io_close_other! */
if (!conn->plan.next)
return;
set_current(conn);
switch (conn->plan.io(conn->fd.fd, &conn->plan)) {
case -1: /* Failure means a new plan: close up. */
conn->plan = io_close();
backend_plan_changed(conn);
break;
case 0: /* Keep going with plan. */
break;
case 1: /* Done: get next plan. */
if (timeout_active(conn))
backend_del_timeout(conn);
/* In case they call io_duplex, clear our poll flags so
* both sides don't seem to be both doing read or write
* (See assert(!mask || pfd->events != mask) in poll.c) */
conn->plan.pollflag = 0;
conn->plan = conn->plan.next(conn, conn->plan.next_arg);
backend_plan_changed(conn);
}
set_current(NULL);
}
/* Close the connection, we're done. */
struct io_plan io_close_(void)
{
struct io_plan plan;
plan.pollflag = 0;
/* This means we're closing. */
plan.next = NULL;
plan.u1.s = errno;
return plan;
}
struct io_plan io_close_cb(struct io_conn *conn, void *arg)
{
return io_close();
}
void io_close_other(struct io_conn *conn)
{
/* Don't close if already closing! */
if (conn->plan.next) {
conn->plan = io_close_();
backend_plan_changed(conn);
}
}
/* Exit the loop, returning this (non-NULL) arg. */
struct io_plan io_break_(void *ret, struct io_plan plan)
{
io_plan_debug_again();
assert(ret);
io_loop_return = ret;
return plan;
}
static struct io_plan io_never_called(struct io_conn *conn, void *arg)
{
abort();
}
struct io_plan io_never(void)
{
return io_always_(io_never_called, NULL);
}
int io_conn_fd(const struct io_conn *conn)
{
return conn->fd.fd;
}
void io_set_alloc(void *(*allocfn)(size_t size),
void *(*reallocfn)(void *ptr, size_t size),
void (*freefn)(void *ptr))
{
io_alloc.alloc = allocfn;
io_alloc.realloc = reallocfn;
io_alloc.free = freefn;
}