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Merged
merged 2 commits into from
Jan 24, 2022
Merged

linux: dynamically load libX11 #20

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3482e04
linux: dynamically load libX11
microo8 Jan 23, 2022
af27ec2
perf: load libX11 only once
microo8 Jan 24, 2022
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125 changes: 91 additions & 34 deletions clipboard_linux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,36 +11,86 @@
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <dlfcn.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>

// syncStatus is a function from the Go side.
extern void syncStatus(uintptr_t handle, int status);

void *libX11;

Display* (*P_XOpenDisplay)(int);
void (*P_XCloseDisplay)(Display*);
Window (*P_XDefaultRootWindow)(Display*);
Window (*P_XCreateSimpleWindow)(Display*, Window, int, int, int, int, int, int, int);
Atom (*P_XInternAtom)(Display*, char*, int);
void (*P_XSetSelectionOwner)(Display*, Atom, Window, unsigned long);
Window (*P_XGetSelectionOwner)(Display*, Atom);
void (*P_XNextEvent)(Display*, XEvent*);
int (*P_XChangeProperty)(Display*, Window, Atom, Atom, int, int, unsigned char*, int);
void (*P_XSendEvent)(Display*, Window, int, long , XEvent*);
int (*P_XGetWindowProperty) (Display*, Window, Atom, long, long, Bool, Atom, Atom*, int*, unsigned long *, unsigned long *, unsigned char **);
void (*P_XFree) (void*);
void (*P_XDeleteProperty) (Display*, Window, Atom);
void (*P_XConvertSelection)(Display*, Atom, Atom, Atom, Window, Time);

int initX11() {
if (libX11) {
return 1;
}
libX11 = dlopen("libX11.so", RTLD_LAZY);
if (!libX11) {
return -1;
}
P_XOpenDisplay = (Display* (*)(int)) dlsym(libX11, "XOpenDisplay");
P_XCloseDisplay = (void (*)(Display*)) dlsym(libX11, "XCloseDisplay");
P_XDefaultRootWindow = (Window (*)(Display*)) dlsym(libX11, "XDefaultRootWindow");
P_XCreateSimpleWindow = (Window (*)(Display*, Window, int, int, int, int, int, int, int)) dlsym(libX11, "XCreateSimpleWindow");
P_XInternAtom = (Atom (*)(Display*, char*, int)) dlsym(libX11, "XInternAtom");
P_XSetSelectionOwner = (void (*)(Display*, Atom, Window, unsigned long)) dlsym(libX11, "XSetSelectionOwner");
P_XGetSelectionOwner = (Window (*)(Display*, Atom)) dlsym(libX11, "XGetSelectionOwner");
P_XNextEvent = (void (*)(Display*, XEvent*)) dlsym(libX11, "XNextEvent");
P_XChangeProperty = (int (*)(Display*, Window, Atom, Atom, int, int, unsigned char*, int)) dlsym(libX11, "XChangeProperty");
P_XSendEvent = (void (*)(Display*, Window, int, long , XEvent*)) dlsym(libX11, "XSendEvent");
P_XGetWindowProperty = (int (*)(Display*, Window, Atom, long, long, Bool, Atom, Atom*, int*, unsigned long *, unsigned long *, unsigned char **)) dlsym(libX11, "XGetWindowProperty");
P_XFree = (void (*)(void*)) dlsym(libX11, "XFree");
P_XDeleteProperty = (void (*)(Display*, Window, Atom)) dlsym(libX11, "XDeleteProperty");
P_XConvertSelection = (void (*)(Display*, Atom, Atom, Atom, Window, Time)) dlsym(libX11, "XConvertSelection");
return 1;
}

int clipboard_test() {
if (!initX11()) {
return -1;
}

Display* d = NULL;
for (int i = 0; i < 42; i++) {
d = XOpenDisplay(0);
d = (*P_XOpenDisplay)(0);
if (d == NULL) {
continue;
}
break;
}

if (d == NULL) {
return -1;
}
XCloseDisplay(d);
(*P_XCloseDisplay)(d);
return 0;
}

// clipboard_write writes the given buf of size n as type typ.
// if start is provided, the value of start will be changed to 1 to indicate
// if the write is availiable for reading.
int clipboard_write(char *typ, unsigned char *buf, size_t n, uintptr_t handle) {
if (!initX11()) {
return -1;
}

Display* d = NULL;
for (int i = 0; i < 42; i++) {
d = XOpenDisplay(0);
d = (*P_XOpenDisplay)(0);
if (d == NULL) {
continue;
}
Expand All @@ -50,26 +100,25 @@ int clipboard_write(char *typ, unsigned char *buf, size_t n, uintptr_t handle) {
syncStatus(handle, -1);
return -1;
}

Window w = XCreateSimpleWindow(d, DefaultRootWindow(d), 0, 0, 1, 1, 0, 0, 0);
Window w = (*P_XCreateSimpleWindow)(d, (*P_XDefaultRootWindow)(d), 0, 0, 1, 1, 0, 0, 0);

// Use False because these may not available for the first time.
Atom sel = XInternAtom(d, "CLIPBOARD", False);
Atom atomString = XInternAtom(d, "UTF8_STRING", False);
Atom atomImage = XInternAtom(d, "image/png", False);
Atom targetsAtom = XInternAtom(d, "TARGETS", False);
Atom sel = (*P_XInternAtom)(d, "CLIPBOARD", 0);
Atom atomString = (*P_XInternAtom)(d, "UTF8_STRING", 0);
Atom atomImage = (*P_XInternAtom)(d, "image/png", 0);
Atom targetsAtom = (*P_XInternAtom)(d, "TARGETS", 0);

// Use True to makesure the requested type is a valid type.
Atom target = XInternAtom(d, typ, True);
Atom target = (*P_XInternAtom)(d, typ, 1);
if (target == None) {
XCloseDisplay(d);
(*P_XCloseDisplay)(d);
syncStatus(handle, -2);
return -2;
}

XSetSelectionOwner(d, sel, w, CurrentTime);
if (XGetSelectionOwner(d, sel) != w) {
XCloseDisplay(d);
(*P_XSetSelectionOwner)(d, sel, w, CurrentTime);
if ((*P_XGetSelectionOwner)(d, sel) != w) {
(*P_XCloseDisplay)(d);
syncStatus(handle, -3);
return -3;
}
Expand All @@ -83,13 +132,13 @@ int clipboard_write(char *typ, unsigned char *buf, size_t n, uintptr_t handle) {
notified = 1;
}

XNextEvent(d, &event);
(*P_XNextEvent)(d, &event);
switch (event.type) {
case SelectionClear:
// For debugging:
// printf("x11write: lost ownership of clipboard selection.\n");
// fflush(stdout);
XCloseDisplay(d);
(*P_XCloseDisplay)(d);
return 0;
case SelectionNotify:
// For debugging:
Expand All @@ -114,24 +163,24 @@ int clipboard_write(char *typ, unsigned char *buf, size_t n, uintptr_t handle) {
ev.property = xsr->property;

if (ev.target == atomString && ev.target == target) {
R = XChangeProperty(ev.display, ev.requestor, ev.property,
R = (*P_XChangeProperty)(ev.display, ev.requestor, ev.property,
atomString, 8, PropModeReplace, buf, n);
} else if (ev.target == atomImage && ev.target == target) {
R = XChangeProperty(ev.display, ev.requestor, ev.property,
R = (*P_XChangeProperty)(ev.display, ev.requestor, ev.property,
atomImage, 8, PropModeReplace, buf, n);
} else if (ev.target == targetsAtom) {
// Reply atoms for supported targets, other clients should
// request the clipboard again and obtain the data if their
// implementation is correct.
Atom targets[] = { atomString, atomImage };
R = XChangeProperty(ev.display, ev.requestor, ev.property,
R = (*P_XChangeProperty)(ev.display, ev.requestor, ev.property,
XA_ATOM, 32, PropModeReplace,
(unsigned char *)&targets, sizeof(targets)/sizeof(Atom));
} else {
ev.property = None;
}

if ((R & 2) == 0) XSendEvent(d, ev.requestor, 0, 0, (XEvent *)&ev);
if ((R & 2) == 0) (*P_XSendEvent)(d, ev.requestor, 0, 0, (XEvent *)&ev);
break;
}
}
Expand All @@ -140,6 +189,10 @@ int clipboard_write(char *typ, unsigned char *buf, size_t n, uintptr_t handle) {
// read_data reads the property of a selection if the target atom matches
// the actual atom.
unsigned long read_data(XSelectionEvent *sev, Atom sel, Atom prop, Atom target, char **buf) {
if (!initX11()) {
return -1;
}

unsigned char *data;
Atom actual;
int format;
Expand All @@ -149,7 +202,7 @@ unsigned long read_data(XSelectionEvent *sev, Atom sel, Atom prop, Atom target,
return 0;
}

int ret = XGetWindowProperty(sev->display, sev->requestor, sev->property,
int ret = (*P_XGetWindowProperty)(sev->display, sev->requestor, sev->property,
0L, (~0L), 0, AnyPropertyType, &actual, &format, &size, &n, &data);
if (ret != Success) {
return 0;
Expand All @@ -159,8 +212,8 @@ unsigned long read_data(XSelectionEvent *sev, Atom sel, Atom prop, Atom target,
*buf = (char *)malloc(size * sizeof(char));
memcpy(*buf, data, size*sizeof(char));
}
XFree(data);
XDeleteProperty(sev->display, sev->requestor, sev->property);
(*P_XFree)(data);
(*P_XDeleteProperty)(sev->display, sev->requestor, sev->property);
return size * sizeof(char);
}

Expand All @@ -169,9 +222,13 @@ unsigned long read_data(XSelectionEvent *sev, Atom sel, Atom prop, Atom target,
//
// The caller of this function should responsible for the free of the buf.
unsigned long clipboard_read(char* typ, char **buf) {
if (!initX11()) {
return -1;
}

Display* d = NULL;
for (int i = 0; i < 42; i++) {
d = XOpenDisplay(0);
d = (*P_XOpenDisplay)(0);
if (d == NULL) {
continue;
}
Expand All @@ -181,27 +238,27 @@ unsigned long clipboard_read(char* typ, char **buf) {
return -1;
}

Window w = XCreateSimpleWindow(d, DefaultRootWindow(d), 0, 0, 1, 1, 0, 0, 0);
Window w = (*P_XCreateSimpleWindow)(d, (*P_XDefaultRootWindow)(d), 0, 0, 1, 1, 0, 0, 0);

// Use False because these may not available for the first time.
Atom sel = XInternAtom(d, "CLIPBOARD", False);
Atom prop = XInternAtom(d, "GOLANG_DESIGN_DATA", False);
Atom sel = (*P_XInternAtom)(d, "CLIPBOARD", False);
Atom prop = (*P_XInternAtom)(d, "GOLANG_DESIGN_DATA", False);

// Use True to makesure the requested type is a valid type.
Atom target = XInternAtom(d, typ, True);
Atom target = (*P_XInternAtom)(d, typ, True);
if (target == None) {
XCloseDisplay(d);
(*P_XCloseDisplay)(d);
return -2;
}

XConvertSelection(d, sel, target, prop, w, CurrentTime);
(*P_XConvertSelection)(d, sel, target, prop, w, CurrentTime);
XEvent event;
for (;;) {
XNextEvent(d, &event);
(*P_XNextEvent)(d, &event);
if (event.type != SelectionNotify) continue;
break;
}
unsigned long n = read_data((XSelectionEvent *)&event.xselection, sel, prop, target, buf);
XCloseDisplay(d);
(*P_XCloseDisplay)(d);
return n;
}
}
5 changes: 1 addition & 4 deletions clipboard_linux.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -10,14 +10,11 @@
package clipboard

/*
#cgo LDFLAGS: -lX11
#cgo LDFLAGS: -ldl
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <stdatomic.h>

int clipboard_test();
int clipboard_write(
Expand Down