diff options
Diffstat (limited to 'backend/session/direct-ipc.c')
-rw-r--r-- | backend/session/direct-ipc.c | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/backend/session/direct-ipc.c b/backend/session/direct-ipc.c deleted file mode 100644 index d98d4e66..00000000 --- a/backend/session/direct-ipc.c +++ /dev/null @@ -1,237 +0,0 @@ -#define _POSIX_C_SOURCE 200809L -#ifdef __FreeBSD__ -#define __BSD_VISIBLE 1 -#include <linux/input.h> -#endif -#include <errno.h> -#include <fcntl.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sys/socket.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <sys/wait.h> -#include <unistd.h> -#include <wlr/config.h> -#include <wlr/util/log.h> -#include <xf86drm.h> -#ifdef __linux__ -#include <sys/sysmacros.h> -#include <linux/major.h> -#endif -#include "backend/session/direct-ipc.h" - -enum { DRM_MAJOR = 226 }; - -static void send_msg(int sock, int fd, void *buf, size_t buf_len) { - char control[CMSG_SPACE(sizeof(fd))] = {0}; - struct iovec iovec = { .iov_base = buf, .iov_len = buf_len }; - struct msghdr msghdr = {0}; - - if (buf) { - msghdr.msg_iov = &iovec; - msghdr.msg_iovlen = 1; - } - - if (fd >= 0) { - msghdr.msg_control = &control; - msghdr.msg_controllen = sizeof(control); - - struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msghdr); - *cmsg = (struct cmsghdr) { - .cmsg_level = SOL_SOCKET, - .cmsg_type = SCM_RIGHTS, - .cmsg_len = CMSG_LEN(sizeof(fd)), - }; - memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd)); - } - - ssize_t ret; - do { - ret = sendmsg(sock, &msghdr, 0); - } while (ret < 0 && errno == EINTR); -} - -static ssize_t recv_msg(int sock, int *fd_out, void *buf, size_t buf_len) { - char control[CMSG_SPACE(sizeof(*fd_out))] = {0}; - struct iovec iovec = { .iov_base = buf, .iov_len = buf_len }; - struct msghdr msghdr = {0}; - - if (buf) { - msghdr.msg_iov = &iovec; - msghdr.msg_iovlen = 1; - } - - if (fd_out) { - msghdr.msg_control = &control; - msghdr.msg_controllen = sizeof(control); - } - - ssize_t ret; - do { - ret = recvmsg(sock, &msghdr, MSG_CMSG_CLOEXEC); - } while (ret < 0 && errno == EINTR); - - if (fd_out) { - struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msghdr); - if (cmsg) { - memcpy(fd_out, CMSG_DATA(cmsg), sizeof(*fd_out)); - } else { - *fd_out = -1; - } - } - - return ret; -} - -enum msg_type { - MSG_OPEN, - MSG_SETMASTER, - MSG_DROPMASTER, - MSG_END, -}; - -struct msg { - enum msg_type type; - char path[256]; -}; - -static void communicate(int sock) { - struct msg msg; - int drm_fd = -1; - bool running = true; - - while (running && recv_msg(sock, &drm_fd, &msg, sizeof(msg)) > 0) { - switch (msg.type) { - case MSG_OPEN: - errno = 0; - - // These are the same flags that logind opens files with - int fd = open(msg.path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); - int ret = errno; - if (fd == -1) { - goto error; - } - -#ifndef __FreeBSD__ - struct stat st; - if (fstat(fd, &st) < 0) { - ret = errno; - goto error; - } - - uint32_t maj = major(st.st_rdev); - if (maj != INPUT_MAJOR && maj != DRM_MAJOR) { - ret = ENOTSUP; - goto error; - } - - if (maj == DRM_MAJOR && drmSetMaster(fd)) { - ret = errno; - } -#else - int ev; - struct drm_version dv = {0}; - if (ioctl(fd, EVIOCGVERSION, &ev) == -1 && - ioctl(fd, DRM_IOCTL_VERSION, &dv) == -1) { - ret = ENOTSUP; - goto error; - } - - if (dv.version_major != 0 && drmSetMaster(fd)) { - ret = errno; - } -#endif - -error: - send_msg(sock, ret ? -1 : fd, &ret, sizeof(ret)); - if (fd >= 0) { - close(fd); - } - - break; - - case MSG_SETMASTER: - drmSetMaster(drm_fd); - close(drm_fd); - send_msg(sock, -1, NULL, 0); - break; - - case MSG_DROPMASTER: - drmDropMaster(drm_fd); - close(drm_fd); - send_msg(sock, -1, NULL, 0); - break; - - case MSG_END: - running = false; - send_msg(sock, -1, NULL, 0); - break; - } - } - - close(sock); -} - -int direct_ipc_open(int sock, const char *path) { - struct msg msg = { .type = MSG_OPEN }; - snprintf(msg.path, sizeof(msg.path), "%s", path); - - send_msg(sock, -1, &msg, sizeof(msg)); - - int fd, err, ret; - int retry = 0; - do { - ret = recv_msg(sock, &fd, &err, sizeof(err)); - } while (ret == 0 && retry++ < 3); - - return err ? -err : fd; -} - -void direct_ipc_setmaster(int sock, int fd) { - struct msg msg = { .type = MSG_SETMASTER }; - - send_msg(sock, fd, &msg, sizeof(msg)); - recv_msg(sock, NULL, NULL, 0); -} - -void direct_ipc_dropmaster(int sock, int fd) { - struct msg msg = { .type = MSG_DROPMASTER }; - - send_msg(sock, fd, &msg, sizeof(msg)); - recv_msg(sock, NULL, NULL, 0); -} - -void direct_ipc_finish(int sock, pid_t pid) { - struct msg msg = { .type = MSG_END }; - - send_msg(sock, -1, &msg, sizeof(msg)); - recv_msg(sock, NULL, NULL, 0); - - waitpid(pid, NULL, 0); -} - -int direct_ipc_init(pid_t *pid_out) { - int sock[2]; - if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sock) < 0) { - wlr_log_errno(WLR_ERROR, "Failed to create socket pair"); - return -1; - } - - pid_t pid = fork(); - if (pid < 0) { - wlr_log_errno(WLR_ERROR, "Fork failed"); - close(sock[0]); - close(sock[1]); - return -1; - } else if (pid == 0) { - close(sock[0]); - communicate(sock[1]); - _Exit(0); - } - - close(sock[1]); - *pid_out = pid; - return sock[0]; -} |