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#define _POSIX_C_SOURCE 200809L
#include <stdlib.h>
#include <string.h>
#include "sway/input/seat.h"
#include "sway/output.h"
#include "sway/desktop/launcher.h"
#include "sway/tree/container.h"
#include "sway/tree/workspace.h"
#include "log.h"
static struct wl_list pid_workspaces;
struct pid_workspace {
pid_t pid;
char *workspace;
struct timespec time_added;
struct sway_output *output;
struct wl_listener output_destroy;
struct wl_list link;
};
/**
* Get the pid of a parent process given the pid of a child process.
*
* Returns the parent pid or NULL if the parent pid cannot be determined.
*/
static pid_t get_parent_pid(pid_t child) {
pid_t parent = -1;
char file_name[100];
char *buffer = NULL;
const char *sep = " ";
FILE *stat = NULL;
size_t buf_size = 0;
snprintf(file_name, sizeof(file_name), "/proc/%d/stat", child);
if ((stat = fopen(file_name, "r"))) {
if (getline(&buffer, &buf_size, stat) != -1) {
strtok(buffer, sep); // pid
strtok(NULL, sep); // executable name
strtok(NULL, sep); // state
char *token = strtok(NULL, sep); // parent pid
parent = strtol(token, NULL, 10);
}
free(buffer);
fclose(stat);
}
if (parent) {
return (parent == child) ? -1 : parent;
}
return -1;
}
static void pid_workspace_destroy(struct pid_workspace *pw) {
wl_list_remove(&pw->output_destroy.link);
wl_list_remove(&pw->link);
free(pw->workspace);
free(pw);
}
struct sway_workspace *root_workspace_for_pid(pid_t pid) {
if (!pid_workspaces.prev && !pid_workspaces.next) {
wl_list_init(&pid_workspaces);
return NULL;
}
struct sway_workspace *ws = NULL;
struct pid_workspace *pw = NULL;
sway_log(SWAY_DEBUG, "Looking up workspace for pid %d", pid);
do {
struct pid_workspace *_pw = NULL;
wl_list_for_each(_pw, &pid_workspaces, link) {
if (pid == _pw->pid) {
pw = _pw;
sway_log(SWAY_DEBUG,
"found pid_workspace for pid %d, workspace %s",
pid, pw->workspace);
goto found;
}
}
pid = get_parent_pid(pid);
} while (pid > 1);
found:
if (pw && pw->workspace) {
ws = workspace_by_name(pw->workspace);
if (!ws) {
sway_log(SWAY_DEBUG,
"Creating workspace %s for pid %d because it disappeared",
pw->workspace, pid);
struct sway_output *output = pw->output;
if (pw->output && !pw->output->enabled) {
sway_log(SWAY_DEBUG,
"Workspace output %s is disabled, trying another one",
pw->output->wlr_output->name);
output = NULL;
}
ws = workspace_create(output, pw->workspace);
}
pid_workspace_destroy(pw);
}
return ws;
}
static void pw_handle_output_destroy(struct wl_listener *listener, void *data) {
struct pid_workspace *pw = wl_container_of(listener, pw, output_destroy);
pw->output = NULL;
wl_list_remove(&pw->output_destroy.link);
wl_list_init(&pw->output_destroy.link);
}
void root_record_workspace_pid(pid_t pid) {
sway_log(SWAY_DEBUG, "Recording workspace for process %d", pid);
if (!pid_workspaces.prev && !pid_workspaces.next) {
wl_list_init(&pid_workspaces);
}
struct sway_seat *seat = input_manager_current_seat();
struct sway_workspace *ws = seat_get_focused_workspace(seat);
if (!ws) {
sway_log(SWAY_DEBUG, "Bailing out, no workspace");
return;
}
struct sway_output *output = ws->output;
if (!output) {
sway_log(SWAY_DEBUG, "Bailing out, no output");
return;
}
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
// Remove expired entries
static const int timeout = 60;
struct pid_workspace *old, *_old;
wl_list_for_each_safe(old, _old, &pid_workspaces, link) {
if (now.tv_sec - old->time_added.tv_sec >= timeout) {
pid_workspace_destroy(old);
}
}
struct pid_workspace *pw = calloc(1, sizeof(struct pid_workspace));
pw->workspace = strdup(ws->name);
pw->output = output;
pw->pid = pid;
memcpy(&pw->time_added, &now, sizeof(struct timespec));
pw->output_destroy.notify = pw_handle_output_destroy;
wl_signal_add(&output->wlr_output->events.destroy, &pw->output_destroy);
wl_list_insert(&pid_workspaces, &pw->link);
}
void root_remove_workspace_pid(pid_t pid) {
if (!pid_workspaces.prev || !pid_workspaces.next) {
return;
}
struct pid_workspace *pw, *tmp;
wl_list_for_each_safe(pw, tmp, &pid_workspaces, link) {
if (pid == pw->pid) {
pid_workspace_destroy(pw);
return;
}
}
}
void root_rename_pid_workspaces(const char *old_name, const char *new_name) {
if (!pid_workspaces.prev && !pid_workspaces.next) {
wl_list_init(&pid_workspaces);
}
struct pid_workspace *pw = NULL;
wl_list_for_each(pw, &pid_workspaces, link) {
if (strcmp(pw->workspace, old_name) == 0) {
free(pw->workspace);
pw->workspace = strdup(new_name);
}
}
}
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