desktop detection, app start reorganization

1 files changed, 237 insertions, 0 deletions

diff --git a/apps.c b/apps.c
new file mode 100644
index 0000000..7cbcb72
--- /dev/null
+++ b/apps.c
@@ -0,0 +1,237 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+#include <gtk/gtk.h>
+#include <xs.h>
+
+#include "apps.h"
+
+#define array_size(x) (sizeof(x)/sizeof(*x))
+
+/* ------------------------------------------------------------------ */
+
+static int debug = 1;
+
+int desktop_kde;
+int desktop_gnome;
+
+int app_have_screen;
+int app_have_xenconsole;
+int app_have_krdc;
+int app_have_vncviewer;
+int app_have_kfmclient;
+int app_have_firefox;
+char app_error[256];
+
+/* ------------------------------------------------------------------ */
+
+static gboolean have_binary(char *name)
+{
+    char *path, *elem, *binary;
+    struct stat st;
+    int rc;
+    
+    if (strchr(name,'/')) {
+	/* path specified ... */
+	if (-1 == stat(name, &st))
+	    return false;
+	if (!S_ISREG(st.st_mode))
+	    return false;
+	if (!(st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
+	    return false;
+	return true;
+    }
+
+    /* walk $PATH */
+    path = getenv("PATH");
+    if (NULL == path)
+	return false;
+    path = strdup(path);
+    for (elem = strtok(path, ":"); NULL != elem; elem = strtok(NULL, ":")) {
+	binary = malloc(strlen(elem)+strlen(name)+2);
+	sprintf(binary, "%s/%s", elem, name);
+	rc = stat(binary, &st);
+	free(binary);
+	if (-1 == rc)
+	    continue;
+	if (!S_ISREG(st.st_mode))
+	    continue;
+	if (!(st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
+	    continue;
+	free(path);
+	return true;
+    }
+    free(path);
+    return false;
+}
+
+void detect_applications(void)
+{
+    app_have_screen     = have_binary("screen");
+    app_have_xenconsole = have_binary(XENCONSOLE);
+    app_have_krdc       = have_binary("krdc");
+    app_have_vncviewer  = have_binary("vncviewer");
+    app_have_kfmclient  = have_binary("kfmclient");
+    app_have_firefox    = have_binary("firefox");
+}
+
+/* ------------------------------------------------------------------ */
+
+static int
+check_wm_capability(Display *dpy, Window root, Atom list, Atom wanted)
+{
+    Atom            type;
+    int             format;
+    unsigned int    i;
+    unsigned long   nitems, bytesafter;
+    unsigned char   *args;
+    unsigned long   *ldata;
+    char            *name;
+    int             retval = -1;
+    
+    if (Success != XGetWindowProperty
+	(dpy, root, list, 0, (65536 / sizeof(long)), False,
+	 AnyPropertyType, &type, &format, &nitems, &bytesafter, &args))
+	return -1;
+    if (type != XA_ATOM)
+	return -1;
+    ldata = (unsigned long*)args;
+    for (i = 0; i < nitems; i++) {
+	if (ldata[i] == wanted)
+	    retval = 0;
+	if (debug) {
+	    name = XGetAtomName(dpy,ldata[i]);
+	    fprintf(stderr,"wm cap: %s\n",name);
+	    XFree(name);
+	}
+    }
+    XFree(ldata);
+    return retval;
+}
+
+static int
+check_atom_present(Display *dpy, Window root, Atom check)
+{
+    Atom            type;
+    int             format;
+    unsigned long   nitems, bytesafter;
+    unsigned char   *args;
+    
+    if (Success != XGetWindowProperty
+	(dpy, root, check, 0, (65536 / sizeof(long)), False,
+	 AnyPropertyType, &type, &format, &nitems, &bytesafter, &args))
+	return -1;
+    return 0;
+}
+
+#define INIT_ATOM(dpy,atom) atom = XInternAtom(dpy,#atom,False)
+static Atom _NET_SUPPORTED;
+static Atom _NET_WM_STATE_ABOVE;
+static Atom KWIN_RUNNING;
+
+void detect_desktop(void)
+{
+    Display *dpy = gdk_x11_display_get_xdisplay(gdk_display_get_default());
+    Window  root = DefaultRootWindow(dpy);
+
+    if (0) {
+	INIT_ATOM(dpy, _NET_SUPPORTED);
+	INIT_ATOM(dpy, _NET_WM_STATE_ABOVE);
+	check_wm_capability(dpy, root, _NET_SUPPORTED, _NET_WM_STATE_ABOVE);
+    }
+
+    INIT_ATOM(dpy, KWIN_RUNNING);
+    if (0 == check_atom_present(dpy, root, KWIN_RUNNING))
+	desktop_kde = 1;
+
+    if (desktop_kde)
+	fprintf(stderr,"Desktop: KDE\n");
+    if (desktop_gnome)
+	fprintf(stderr,"Desktop: gnome\n");
+}
+
+/* ------------------------------------------------------------------ */
+
+int run_application(int do_wait, const char *app, ...)
+{
+    va_list args;
+    char *argv[64];
+    int status, rc, i;
+    pid_t pid;
+
+    while (waitpid(-1, &status, WNOHANG) > 0)
+	/* collect zombies */;
+    
+    if (debug)
+	fprintf(stderr,"%s: %s |", __FUNCTION__, app);
+    va_start(args, app);
+    for (i = 0; i < array_size(argv); i++) {
+	argv[i] = va_arg(args, char*);
+	if (NULL == argv[i])
+	    break;
+	if (debug)
+	    fprintf(stderr,"%s \"%s\"", (0 == i) ? "" : ",", argv[i]);
+    }
+    va_end(args);
+    if (debug)
+	fprintf(stderr,"\n");
+
+    if (array_size(argv) == i) {
+	fprintf(stderr,"%s: oops: argv too small\n", __FUNCTION__);
+	return -1;
+    }
+
+    if (0 == (pid = fork())) {
+	/* child */
+	execvp(app, argv);
+	fprintf(stderr,"%s: execvp(%s): %s\n", __FUNCTION__,
+		app, strerror(errno));
+	exit(1);
+    }
+
+    if (!do_wait)
+	return 0;
+
+    rc = waitpid(pid, &status, 0);
+    if (rc != pid) {
+	/* Huh? */
+	fprintf(stderr,"%s: waidpid(%d): %s\n", __FUNCTION__,
+		pid, strerror(errno));
+	exit(1);
+    }
+    if (!WIFEXITED(status))
+	return -1;
+    return WEXITSTATUS(status);
+}
+
+int open_vnc_session(char *host, int screen)
+{
+    char display[64];
+    char httpurl[64];
+
+    snprintf(display, sizeof(display), "%s:%d", host, screen);
+    snprintf(httpurl, sizeof(httpurl), "http://%s:%d/", host, 5800 + screen);
+
+    if (app_have_vncviewer)
+	return run_application(0, "vncviewer", "vncviewer", display, NULL);
+    if (app_have_krdc)
+	return run_application(0, "krdc", "krdc", display, NULL);
+
+    if (app_have_kfmclient)
+	return run_application(0, "kfmclient", "kfmclient", "openURL", httpurl, NULL);
+    if (app_have_firefox)
+	return run_application(0, "firefox", "firefox", httpurl, NULL);
+
+    snprintf(app_error, sizeof(app_error),
+	     "need vncviewer or krdc, please install\n");
+    return -1;
+}