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frontend: Split process and client handling

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weston_client_start() takes only a single path with no arguments,
forking a process to start that command line, and creating a client from
it.

weston_client_launch(), which was always misnamed and will be renamed in
the next patch, now only handles the child process and nothing else.

Signed-off-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Daniel Stone 2022-07-21 17:04:49 +01:00 committed by Pekka Paalanen
parent 11c9ec11fa
commit c0a75ee379
2 changed files with 64 additions and 55 deletions
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111
compositor/main.c
View file

@ -387,17 +387,14 @@ cleanup_for_child_process() {
sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
}
WL_EXPORT struct wl_client *
WL_EXPORT bool
weston_client_launch(struct weston_compositor *compositor,
struct weston_process *proc,
const char *path,
struct custom_env *child_env,
int *no_cloexec_fds,
size_t num_no_cloexec_fds,
weston_process_cleanup_func_t cleanup)
{
struct wl_client *client = NULL;
struct custom_env child_env;
struct fdstr wayland_socket = FDSTR_INIT;
int no_cloexec_fds[1];
size_t num_no_cloexec_fds = 0;
const char *fail_cloexec = "Couldn't unset CLOEXEC on child FDs";
const char *fail_seteuid = "Couldn't call seteuid";
char *fail_exec;
@ -405,32 +402,15 @@ weston_client_launch(struct weston_compositor *compositor,
char * const *envp;
pid_t pid;
int err;
bool ret;
size_t i;
size_t written __attribute__((unused));
weston_log("launching '%s'\n", path);
str_printf(&fail_exec, "Error: Couldn't launch client '%s'\n", path);
argp = custom_env_get_argp(child_env);
envp = custom_env_get_envp(child_env);
custom_env_init_from_environ(&child_env);
custom_env_add_from_exec_string(&child_env, path);
if (os_socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0,
wayland_socket.fds) < 0) {
weston_log("weston_client_launch: "
"socketpair failed while launching '%s': %s\n",
path, strerror(errno));
custom_env_fini(&child_env);
return NULL;
}
fdstr_update_str1(&wayland_socket);
no_cloexec_fds[num_no_cloexec_fds++] = wayland_socket.fds[1];
custom_env_set_env_var(&child_env, "WAYLAND_SOCKET",
wayland_socket.str1);
argp = custom_env_get_argp(&child_env);
envp = custom_env_get_envp(&child_env);
assert(num_no_cloexec_fds <= ARRAY_LENGTH(no_cloexec_fds));
weston_log("launching '%s'\n", argp[0]);
str_printf(&fail_exec, "Error: Couldn't launch client '%s'\n", argp[0]);
pid = fork();
switch (pid) {
@ -461,36 +441,23 @@ weston_client_launch(struct weston_compositor *compositor,
_exit(EXIT_FAILURE);
default:
close(wayland_socket.fds[1]);
client = wl_client_create(compositor->wl_display,
wayland_socket.fds[0]);
if (!client) {
custom_env_fini(&child_env);
close(wayland_socket.fds[0]);
free(fail_exec);
weston_log("weston_client_launch: "
"wl_client_create failed while launching '%s'.\n",
path);
return NULL;
}
proc->pid = pid;
proc->cleanup = cleanup;
wet_watch_process(compositor, proc);
ret = true;
break;
case -1:
fdstr_close_all(&wayland_socket);
weston_log("weston_client_launch: "
"fork failed while launching '%s': %s\n", path,
"fork failed while launching '%s': %s\n", argp[0],
strerror(errno));
ret = false;
break;
}
custom_env_fini(&child_env);
custom_env_fini(child_env);
free(fail_exec);
return client;
return ret;
}
WL_EXPORT void
@ -536,6 +503,11 @@ weston_client_start(struct weston_compositor *compositor, const char *path)
{
struct process_info *pinfo;
struct wl_client *client;
struct custom_env child_env;
struct fdstr wayland_socket = FDSTR_INIT;
int no_cloexec_fds[1];
size_t num_no_cloexec_fds = 0;
bool ret;
pinfo = zalloc(sizeof *pinfo);
if (!pinfo)
@ -545,18 +517,51 @@ weston_client_start(struct weston_compositor *compositor, const char *path)
if (!pinfo->path)
goto out_free;
client = weston_client_launch(compositor, &pinfo->proc, path,
process_handle_sigchld);
if (!client)
goto out_str;
if (os_socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0,
wayland_socket.fds) < 0) {
weston_log("weston_client_start: "
"socketpair failed while launching '%s': %s\n",
path, strerror(errno));
goto out_path;
}
custom_env_init_from_environ(&child_env);
custom_env_add_from_exec_string(&child_env, path);
fdstr_update_str1(&wayland_socket);
no_cloexec_fds[num_no_cloexec_fds++] = wayland_socket.fds[1];
custom_env_set_env_var(&child_env, "WAYLAND_SOCKET",
wayland_socket.str1);
assert(num_no_cloexec_fds <= ARRAY_LENGTH(no_cloexec_fds));
ret = weston_client_launch(compositor, &pinfo->proc, &child_env,
no_cloexec_fds, num_no_cloexec_fds,
process_handle_sigchld);
if (!ret)
goto out_path;
client = wl_client_create(compositor->wl_display,
wayland_socket.fds[0]);
if (!client) {
weston_log("weston_client_start: "
"wl_client_create failed while launching '%s'.\n",
path);
/* We have no way of killing the process, so leave it hanging */
goto out_sock;
}
/* Close the child end of our socket which we no longer need */
close(wayland_socket.fds[1]);
return client;
out_str:
out_path:
free(pinfo->path);
out_free:
free(pinfo);
out_sock:
fdstr_close_all(&wayland_socket);
return NULL;
}

8
compositor/weston.h
View file

@ -46,10 +46,14 @@ struct weston_process {
struct wl_list link;
};
struct wl_client *
struct custom_env;
bool
weston_client_launch(struct weston_compositor *compositor,
struct weston_process *proc,
const char *path,
struct custom_env *custom_env,
int *fds_no_cloexec,
size_t num_fds_no_cloexec,
weston_process_cleanup_func_t cleanup);
struct wl_client *