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/* This is fcwd written by Adrien Schildknecht (c) 2013
* Email: adrien+dev@schischi.me
* Feel free to copy and redistribute in terms of the
* BSD license
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <glob.h>
#include <sys/stat.h>
#include <X11/Xlib.h>
#define DEBUG 1
#define XA_STRING (XInternAtom(dpy, "STRING", 0))
#define XA_CARDINAL (XInternAtom(dpy, "CARDINAL", 0))
#define XA_WM_STATE (XInternAtom(dpy, "WM_STATE", 0))
#define LOG(fmt, ...) \
do { if (DEBUG) fprintf(stderr, fmt, __VA_ARGS__); } while (0)
Display *dpy;
typedef struct processes_s *processes_t;
struct processes_s {
struct proc_s {
long pid;
long ppid;
char name[32];
} *ps;
size_t n;
};
int nameCmp(const void *p1, const void *p2)
{
return strcasecmp(((struct proc_s *)p1)->name,
((struct proc_s *)p2)->name);
}
int ppidCmp(const void *p1, const void *p2)
{
return ((struct proc_s *)p1)->ppid - ((struct proc_s *)p2)->ppid;
}
static Window focusedWindow()
{
Atom type;
Window focuswin, root, *children;
int format, status, focusrevert;
unsigned long nitems, after;
unsigned char *data;
unsigned int nchildren;
dpy = XOpenDisplay (NULL);
if (!dpy)
exit (1);
XGetInputFocus (dpy, &focuswin, &focusrevert);
root = XDefaultRootWindow(dpy);
do {
status = XGetWindowProperty(dpy, focuswin, XA_WM_STATE, 0, 1024, 0,
XA_WM_STATE, &type, &format, &nitems, &after, &data);
if (status == Success && data) {
XFree(data);
LOG("Window ID = %lu\n", focuswin);
return focuswin;
}
else
return 0;
XQueryTree(dpy, focuswin, &root, &focuswin, &children, &nchildren);
LOG("%s", "Current window does not have WM_STATE, getting parent\n");
} while(focuswin != root);
return 0;
}
static long windowPid(Window focuswin)
{
Atom nameAtom = XInternAtom(dpy, "_NET_WM_PID", 1);
Atom type;
int format, status;
long pid = -1;
unsigned long nitems, after;
unsigned char *data;
status = XGetWindowProperty(dpy, focuswin, nameAtom, 0, 1024, 0,
XA_CARDINAL, &type, &format, &nitems, &after, &data);
if (status == Success && data) {
pid = *((long*)data);
XFree(data);
LOG("_NET_WM_PID = %lu\n", pid);
}
else
LOG("%s", "_NET_WM_PID not found\n");
return pid;
}
static char* windowStrings(Window focuswin, size_t *size, char* hint)
{
Atom nameAtom = XInternAtom(dpy, hint, 1);
Atom type;
int format;
int i;
unsigned long after;
unsigned char *data = 0;
char *ret = NULL;
if (XGetWindowProperty(dpy, focuswin, nameAtom, 0, 1024, 0, AnyPropertyType,
&type, &format, size, &after, &data) == Success) {
if (data) {
if (type == XA_STRING) {
ret = malloc(sizeof(char) * *size);
LOG("%s = ", hint);
for (i = 0; i < *size; ++i) {
LOG("%c", data[i] == 0 ? ' ' : data[i]);
ret[i] = data[i];
}
fprintf(stderr, "\n");
LOG("%s", "\n");
}
XFree(data);
}
else
LOG("%s not found\n", hint);
}
return ret;
}
static void freeProcesses(processes_t p)
{
free(p->ps);
free(p);
}
static processes_t getProcesses(void)
{
glob_t globbuf;
unsigned int i, j;
processes_t p;
glob("/proc/[0-9]*", GLOB_NOSORT, NULL, &globbuf);
p = malloc(sizeof(struct processes_s));
p->ps = malloc(globbuf.gl_pathc * sizeof(struct proc_s));
LOG("Found %ld processes\n", globbuf.gl_pathc);
for (i = j = 0; i < globbuf.gl_pathc; i++) {
char name[32];
FILE *tn;
(void)globbuf.gl_pathv[globbuf.gl_pathc - i - 1];
snprintf(name, sizeof(name), "%s%s",
globbuf.gl_pathv[globbuf.gl_pathc - i - 1], "/stat");
tn = fopen(name, "r");
if (tn == NULL)
continue;
fscanf(tn, "%ld (%32[^)] %*3c %ld", &p->ps[j].pid, p->ps[j].name,
&p->ps[j].ppid);
LOG("\t%-20s\tpid=%6ld\tppid=%6ld\n", p->ps[j].name, p->ps[j].pid,
p->ps[j].ppid);
fclose(tn);
j++;
}
p->n = j;
globfree(&globbuf);
return p;
}
static long lastChild(processes_t p, long pid)
{
struct proc_s key, *res;
do {
key.ppid = pid;
res = (struct proc_s *)bsearch(&key, p->ps, p->n,
sizeof(struct proc_s), ppidCmp);
pid = res ? res->pid : -1;
} while(pid != -1);
return key.ppid;
}
static void readPath(long pid)
{
char buf[255];
char path[64];
ssize_t len;
snprintf(path, sizeof(path), "/proc/%ld/cwd", pid);
LOG("Read %s\n", path);
if ((len = readlink(path, buf, 255)) != -1)
buf[len] = '\0';
fprintf(stdout, "%s\n", buf);
}
int main(int argc, const char *argv[])
{
processes_t p;
long pid;
Window w = focusedWindow();
if (w == 0) {
fprintf(stdout, "%s\n", getenv("HOME"));
return EXIT_FAILURE;
}
pid = windowPid(w);
p = getProcesses();
if (pid != -1) {
qsort(p->ps, p->n, sizeof(struct proc_s), ppidCmp);
}
else {
size_t size;
char* strings;
int i;
struct proc_s *res = NULL, key;
qsort(p->ps, p->n, sizeof(struct proc_s), nameCmp);
strings = windowStrings(w, &size, "WM_CLASS");
for(i = 0; i < size; i += strlen(strings + i) + 1) {
LOG("pidof %s\n", strings + i);
strcpy(key.name, strings + i);
res = (struct proc_s *)bsearch(&key, p->ps, p->n,
sizeof(struct proc_s), nameCmp);
if(res)
break;
}
if (res) {
pid = res->pid;
LOG("Found %s (%ld)\n", res->name, res->pid);
}
if (size != 0)
free(strings);
}
if (pid != -1) {
pid = lastChild(p, pid);
readPath(pid);
}
else {
LOG("%s", "getenv $HOME...\n");
fprintf(stdout, "%s\n", getenv("HOME"));
}
freeProcesses(p);
return EXIT_SUCCESS;
}
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