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Merge pull request #1562 from emersion/remove-sock-cloexec
xwayland: don't use SOCK_CLOEXEC
This commit is contained in:
commit
dcd05f67ab
1 changed files with 50 additions and 33 deletions
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@ -1,8 +1,4 @@
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#define _POSIX_C_SOURCE 200112L
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#ifdef __FreeBSD__
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// for SOCK_CLOEXEC
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#define __BSD_VISIBLE 1
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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@ -36,12 +32,22 @@ static void safe_close(int fd) {
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}
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}
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static int unset_cloexec(int fd) {
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if (fcntl(fd, F_SETFD, 0) != 0) {
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wlr_log_errno(WLR_ERROR, "fcntl() failed on fd %d", fd);
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return -1;
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static bool set_cloexec(int fd, bool cloexec) {
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int flags = fcntl(fd, F_GETFD);
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if (flags == -1) {
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wlr_log_errno(WLR_ERROR, "fcntl failed");
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return false;
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}
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return 0;
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if (cloexec) {
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flags = flags | FD_CLOEXEC;
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} else {
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flags = flags & ~FD_CLOEXEC;
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}
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if (fcntl(fd, F_SETFD, flags) == -1) {
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wlr_log_errno(WLR_ERROR, "fcntl failed");
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return false;
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}
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return true;
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}
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static int fill_arg(char ***argv, const char *fmt, ...) {
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@ -65,12 +71,11 @@ static int fill_arg(char ***argv, const char *fmt, ...) {
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return len;
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}
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_Noreturn
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static void exec_xwayland(struct wlr_xwayland *wlr_xwayland) {
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if (unset_cloexec(wlr_xwayland->x_fd[0]) ||
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unset_cloexec(wlr_xwayland->x_fd[1]) ||
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unset_cloexec(wlr_xwayland->wm_fd[1]) ||
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unset_cloexec(wlr_xwayland->wl_fd[1])) {
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_Noreturn static void exec_xwayland(struct wlr_xwayland *wlr_xwayland) {
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if (!set_cloexec(wlr_xwayland->x_fd[0], false) ||
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!set_cloexec(wlr_xwayland->x_fd[1], false) ||
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!set_cloexec(wlr_xwayland->wm_fd[1], false) ||
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!set_cloexec(wlr_xwayland->wl_fd[1], false)) {
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_exit(EXIT_FAILURE);
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}
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@ -83,7 +88,8 @@ static void exec_xwayland(struct wlr_xwayland *wlr_xwayland) {
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"-listen", NULL /* x_fd[0] */,
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"-listen", NULL /* x_fd[1] */,
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"-wm", NULL /* wm_fd[1] */,
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NULL };
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NULL,
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};
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char **cur_arg = argv;
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if (fill_arg(&cur_arg, ":%d", wlr_xwayland->display) < 0 ||
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@ -304,16 +310,25 @@ static bool xwayland_start_display(struct wlr_xwayland *wlr_xwayland,
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}
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static bool xwayland_start_server(struct wlr_xwayland *wlr_xwayland) {
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wlr_xwayland->wl_fd) != 0 ||
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socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wlr_xwayland->wm_fd) != 0) {
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wlr_log_errno(WLR_ERROR, "failed to create socketpair");
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, wlr_xwayland->wl_fd) != 0 ||
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socketpair(AF_UNIX, SOCK_STREAM, 0, wlr_xwayland->wm_fd) != 0) {
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wlr_log_errno(WLR_ERROR, "socketpair failed");
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xwayland_finish_server(wlr_xwayland);
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return false;
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}
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if (!set_cloexec(wlr_xwayland->wl_fd[0], true) ||
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!set_cloexec(wlr_xwayland->wl_fd[1], true) ||
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!set_cloexec(wlr_xwayland->wm_fd[0], true) ||
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!set_cloexec(wlr_xwayland->wm_fd[1], true)) {
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xwayland_finish_server(wlr_xwayland);
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return false;
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}
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wlr_xwayland->server_start = time(NULL);
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if (!(wlr_xwayland->client = wl_client_create(wlr_xwayland->wl_display, wlr_xwayland->wl_fd[0]))) {
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wlr_xwayland->client =
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wl_client_create(wlr_xwayland->wl_display, wlr_xwayland->wl_fd[0]);
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if (!wlr_xwayland->client) {
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wlr_log_errno(WLR_ERROR, "wl_client_create failed");
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xwayland_finish_server(wlr_xwayland);
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return false;
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@ -329,24 +344,30 @@ static bool xwayland_start_server(struct wlr_xwayland *wlr_xwayland) {
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wlr_xwayland->sigusr1_source = wl_event_loop_add_signal(loop, SIGUSR1,
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xserver_handle_ready, wlr_xwayland);
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if ((wlr_xwayland->pid = fork()) == 0) {
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wlr_xwayland->pid = fork();
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if (wlr_xwayland->pid < 0) {
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wlr_log_errno(WLR_ERROR, "fork failed");
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xwayland_finish_server(wlr_xwayland);
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return false;
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} else if (wlr_xwayland->pid == 0) {
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/* Double-fork, but we need to forward SIGUSR1 once Xserver(1)
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* is ready, or error if there was one. */
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pid_t pid, ppid;
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pid_t ppid = getppid();
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sigset_t sigset;
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int sig;
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ppid = getppid();
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sigemptyset(&sigset);
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sigaddset(&sigset, SIGUSR1);
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sigaddset(&sigset, SIGCHLD);
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sigprocmask(SIG_BLOCK, &sigset, NULL);
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if ((pid = fork()) == 0) {
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exec_xwayland(wlr_xwayland);
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}
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pid_t pid = fork();
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if (pid < 0) {
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wlr_log_errno(WLR_ERROR, "second fork failed");
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_exit(EXIT_FAILURE);
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} else if (pid == 0) {
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exec_xwayland(wlr_xwayland);
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}
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int sig;
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sigwait(&sigset, &sig);
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kill(ppid, SIGUSR1);
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wlr_log(WLR_DEBUG, "sent SIGUSR1 to process %d", ppid);
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@ -354,13 +375,9 @@ static bool xwayland_start_server(struct wlr_xwayland *wlr_xwayland) {
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waitpid(pid, NULL, 0);
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_exit(EXIT_FAILURE);
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}
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_exit(EXIT_SUCCESS);
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}
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if (wlr_xwayland->pid < 0) {
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wlr_log_errno(WLR_ERROR, "fork failed");
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xwayland_finish_server(wlr_xwayland);
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return false;
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}
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/* close child fds */
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/* remain managing x sockets for lazy start */
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