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seat: avoid copying the keymap for each client 

We can just send a read-only file descriptor instead.
This commit is contained in:
Simon Ser 2021-08-07 13:48:49 +02:00 committed by Kenny Levinsen
parent 62924cc523
commit d290b13871
1 changed files with 2 additions and 33 deletions
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35
types/seat/wlr_seat_keyboard.c
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@ -1,17 +1,13 @@
#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <wayland-server-core.h>
#include <wlr/types/wlr_data_device.h>
#include <wlr/types/wlr_input_device.h>
#include <wlr/util/log.h>
#include "types/wlr_data_device.h"
#include "types/wlr_seat.h"
#include "util/shm.h"
#include "util/signal.h"
static void default_keyboard_enter(struct wlr_seat_keyboard_grab *grab,
@ -364,35 +360,8 @@ static void seat_client_send_keymap(struct wlr_seat_client *client,
continue;
}
int keymap_fd = allocate_shm_file(keyboard->keymap_size);
if (keymap_fd < 0) {
wlr_log(WLR_ERROR, "creating a keymap file for %zu bytes failed", keyboard->keymap_size);
continue;
}
if (keyboard->keymap == NULL) {
wl_keyboard_send_keymap(resource,
WL_KEYBOARD_KEYMAP_FORMAT_NO_KEYMAP, keymap_fd, 0);
close(keymap_fd);
continue;
}
void *ptr = mmap(NULL, keyboard->keymap_size, PROT_READ | PROT_WRITE,
MAP_SHARED, keymap_fd, 0);
if (ptr == MAP_FAILED) {
wlr_log(WLR_ERROR, "failed to mmap() %zu bytes", keyboard->keymap_size);
close(keymap_fd);
continue;
}
strcpy(ptr, keyboard->keymap_string);
munmap(ptr, keyboard->keymap_size);
wl_keyboard_send_keymap(resource,
WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1, keymap_fd,
keyboard->keymap_size);
close(keymap_fd);
wl_keyboard_send_keymap(resource, WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1,
keyboard->keymap_fd, keyboard->keymap_size);
}
}