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weston/connection.c

395 lines
9.4 KiB

/*
* Copyright © 2008 Kristian Høgsberg
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/uio.h>
#include <ffi.h>
#include <assert.h>
#include "wayland-util.h"
#include "connection.h"
#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
struct wl_buffer {
char data[4096];
int head, tail;
};
struct wl_connection {
struct wl_buffer in, out;
int fd;
void *data;
wl_connection_update_func_t update;
};
struct wl_connection *
wl_connection_create(int fd,
wl_connection_update_func_t update,
void *data)
{
struct wl_connection *connection;
connection = malloc(sizeof *connection);
memset(connection, 0, sizeof *connection);
connection->fd = fd;
connection->update = update;
connection->data = data;
connection->update(connection,
WL_CONNECTION_READABLE,
connection->data);
return connection;
}
void
wl_connection_destroy(struct wl_connection *connection)
{
free(connection);
}
void
wl_connection_copy(struct wl_connection *connection, void *data, size_t size)
{
struct wl_buffer *b;
int tail, rest;
b = &connection->in;
tail = b->tail;
if (tail + size <= ARRAY_LENGTH(b->data)) {
memcpy(data, b->data + tail, size);
} else {
rest = ARRAY_LENGTH(b->data) - tail;
memcpy(data, b->data + tail, rest);
memcpy(data + rest, b->data, size - rest);
}
}
void
wl_connection_consume(struct wl_connection *connection, size_t size)
{
struct wl_buffer *b;
int tail, rest;
b = &connection->in;
tail = b->tail;
if (tail + size <= ARRAY_LENGTH(b->data)) {
b->tail += size;
} else {
rest = ARRAY_LENGTH(b->data) - tail;
b->tail = size - rest;
}
}
int wl_connection_data(struct wl_connection *connection, uint32_t mask)
{
struct wl_buffer *b;
struct iovec iov[2];
int len, head, tail, count, size, available;
if (mask & WL_CONNECTION_READABLE) {
b = &connection->in;
head = connection->in.head;
if (head < b->tail) {
iov[0].iov_base = b->data + head;
iov[0].iov_len = b->tail - head;
count = 1;
} else {
size = ARRAY_LENGTH(b->data) - head;
iov[0].iov_base = b->data + head;
iov[0].iov_len = size;
iov[1].iov_base = b->data;
iov[1].iov_len = b->tail;
count = 2;
}
do {
len = readv(connection->fd, iov, count);
} while (len < 0 && errno == EINTR);
if (len < 0) {
fprintf(stderr,
"read error from connection %p: %m (%d)\n",
connection, errno);
return -1;
} else if (len == 0) {
/* FIXME: Handle this better? */
return -1;
} else if (head + len <= ARRAY_LENGTH(b->data)) {
b->head += len;
} else {
b->head = head + len - ARRAY_LENGTH(b->data);
}
/* We know we have data in the buffer at this point,
* so if head equals tail, it means the buffer is
* full. */
available = b->head - b->tail;
if (available == 0)
available = sizeof b->data;
else if (available < 0)
available += ARRAY_LENGTH(b->data);
} else {
available = 0;
}
if (mask & WL_CONNECTION_WRITABLE) {
b = &connection->out;
tail = b->tail;
if (tail < b->head) {
iov[0].iov_base = b->data + tail;
iov[0].iov_len = b->head - tail;
count = 1;
} else {
size = ARRAY_LENGTH(b->data) - tail;
iov[0].iov_base = b->data + tail;
iov[0].iov_len = size;
iov[1].iov_base = b->data;
iov[1].iov_len = b->head;
count = 2;
}
do {
len = writev(connection->fd, iov, count);
} while (len < 0 && errno == EINTR);
if (len < 0) {
fprintf(stderr, "write error for connection %p: %m\n", connection);
return -1;
} else if (tail + len <= ARRAY_LENGTH(b->data)) {
b->tail += len;
} else {
b->tail = tail + len - ARRAY_LENGTH(b->data);
}
/* We just took data out of the buffer, so at this
* point if head equals tail, the buffer is empty. */
if (b->tail == b->head)
connection->update(connection,
WL_CONNECTION_READABLE,
connection->data);
}
return available;
}
void
wl_connection_write(struct wl_connection *connection, const void *data, size_t count)
{
struct wl_buffer *b;
size_t size;
int head;
b = &connection->out;
head = b->head;
if (head + count <= ARRAY_LENGTH(b->data)) {
memcpy(b->data + head, data, count);
b->head += count;
} else {
size = ARRAY_LENGTH(b->data) - head;
memcpy(b->data + head, data, size);
memcpy(b->data, data + size, count - size);
b->head = count - size;
}
if (b->tail == head)
connection->update(connection,
WL_CONNECTION_READABLE |
WL_CONNECTION_WRITABLE,
connection->data);
}
void
wl_connection_vmarshal(struct wl_connection *connection,
struct wl_object *sender,
uint32_t opcode, va_list ap,
const struct wl_message *message)
{
struct wl_object *object;
uint32_t args[32], length, *p, size;
struct wl_array *array;
const char *s;
int i, count;
count = strlen(message->signature);
assert(count <= ARRAY_LENGTH(args));
p = &args[2];
for (i = 0; i < count; i++) {
switch (message->signature[i]) {
case 'u':
case 'i':
*p++ = va_arg(ap, uint32_t);
break;
case 's':
s = va_arg(ap, const char *);
length = strlen(s);
*p++ = length;
memcpy(p, s, length);
p += DIV_ROUNDUP(length, sizeof(*p));
break;
case 'o':
case 'n':
object = va_arg(ap, struct wl_object *);
*p++ = object ? object->id : 0;
break;
case 'a':
array = va_arg(ap, struct wl_array *);
if (array == NULL || array->size == 0) {
*p++ = 0;
break;
}
*p++ = array->size;
memcpy(p, array->data, array->size);
p = (void *) p + array->size;
break;
default:
assert(0);
break;
}
}
size = (p - args) * sizeof *p;
args[0] = sender->id;
args[1] = opcode | (size << 16);
wl_connection_write(connection, args, size);
}
void
wl_connection_demarshal(struct wl_connection *connection,
uint32_t size,
struct wl_hash_table *objects,
void (*func)(void),
void *data, struct wl_object *target,
const struct wl_message *message)
{
ffi_type *types[20];
ffi_cif cif;
uint32_t *p, result, length;
int i, count;
union {
uint32_t uint32;
char *string;
void *object;
uint32_t new_id;
struct wl_array *array;
} values[20];
void *args[20];
struct wl_object *object;
uint32_t buffer[64];
count = strlen(message->signature) + 2;
if (count > ARRAY_LENGTH(types)) {
printf("too many args (%d)\n", count);
return;
}
if (sizeof buffer < size) {
printf("request too big, should malloc tmp buffer here\n");
return;
}
types[0] = &ffi_type_pointer;
values[0].object = data;
args[0] = &values[0];
types[1] = &ffi_type_pointer;
values[1].object = target;
args[1] = &values[1];
wl_connection_copy(connection, buffer, size);
p = &buffer[2];
for (i = 2; i < count; i++) {
switch (message->signature[i - 2]) {
case 'u':
case 'i':
types[i] = &ffi_type_uint32;
values[i].uint32 = *p++;
break;
case 's':
types[i] = &ffi_type_pointer;
length = *p++;
values[i].string = malloc(length + 1);
if (values[i].string == NULL) {
/* FIXME: Send NO_MEMORY */
return;
}
memcpy(values[i].string, p, length);
values[i].string[length] = '\0';
p += DIV_ROUNDUP(length, sizeof *p);
break;
case 'o':
types[i] = &ffi_type_pointer;
object = wl_hash_table_lookup(objects, *p);
if (object == NULL && *p != 0)
printf("unknown object (%d), message %s(%s)\n",
*p, message->name, message->signature);
values[i].object = object;
p++;
break;
case 'n':
types[i] = &ffi_type_uint32;
values[i].new_id = *p;
object = wl_hash_table_lookup(objects, *p);
if (object != NULL)
printf("object already exists (%d)\n", *p);
p++;
break;
case 'a':
types[i] = &ffi_type_pointer;
length = *p++;
values[i].array = malloc(length + sizeof *values[i].array);
if (values[i].array == NULL) {
/* FIXME: Send NO_MEMORY */
return;
}
values[i].array->size = length;
values[i].array->alloc = 0;
values[i].array->data = values[i].array + 1;
memcpy(values[i].array->data, p, length);
p += DIV_ROUNDUP(length, sizeof *p);
break;
default:
printf("unknown type\n");
break;
}
args[i] = &values[i];
}
ffi_prep_cif(&cif, FFI_DEFAULT_ABI, count, &ffi_type_uint32, types);
ffi_call(&cif, func, &result, args);
for (i = 2; i < count; i++) {
switch (message->signature[i - 2]) {
case 's':
free(values[i].string);
break;
case 'a':
free(values[i].array);
break;
}
}
}