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compositor: implement wayland socket handover (#6930)

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* compositor: implement wayland socket handover

This commit implements the compositor side of the Wayland socket
handover protocol as described in the [KDE Wiki]. The CLI options are
chosen so that they are compatible with Kwin.

[KDE Wiki]: https://invent.kde.org/plasma/kwin/-/wikis/Restarting

* main: verify that --wayland-fd is a valid file descriptor

* main: fail if only one of --socket and --wayland-fd is passed
This commit is contained in:
Ferdinand Bachmann
2024-07-20 00:37:20 +02:00
committed by GitHub
parent 8e15f91c24
commit efccf25fcc
5 changed files with 74 additions and 12 deletions
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30
src/Compositor.cpp
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@@ -27,6 +27,7 @@
#include <hyprutils/string/String.hpp>
using namespace Hyprutils::String;
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/resource.h>
@@ -533,19 +534,28 @@ void CCompositor::prepareFallbackOutput() {
wlr_headless_add_output(headless, 1920, 1080);
}
void CCompositor::startCompositor() {
void CCompositor::startCompositor(std::string socketName, int socketFd) {
initAllSignals();
// get socket, avoid using 0
for (int candidate = 1; candidate <= 32; candidate++) {
const auto CANDIDATESTR = ("wayland-" + std::to_string(candidate));
const auto RETVAL = wl_display_add_socket(m_sWLDisplay, CANDIDATESTR.c_str());
if (!socketName.empty() && socketFd != -1) {
fcntl(socketFd, F_SETFD, FD_CLOEXEC);
const auto RETVAL = wl_display_add_socket_fd(m_sWLDisplay, socketFd);
if (RETVAL >= 0) {
m_szWLDisplaySocket = CANDIDATESTR;
Debug::log(LOG, "wl_display_add_socket for {} succeeded with {}", CANDIDATESTR, RETVAL);
break;
} else {
Debug::log(WARN, "wl_display_add_socket for {} returned {}: skipping candidate {}", CANDIDATESTR, RETVAL, candidate);
m_szWLDisplaySocket = socketName;
Debug::log(LOG, "wl_display_add_socket_fd for {} succeeded with {}", socketName, RETVAL);
} else
Debug::log(WARN, "wl_display_add_socket_fd for {} returned {}: skipping", socketName, RETVAL);
} else {
// get socket, avoid using 0
for (int candidate = 1; candidate <= 32; candidate++) {
const auto CANDIDATESTR = ("wayland-" + std::to_string(candidate));
const auto RETVAL = wl_display_add_socket(m_sWLDisplay, CANDIDATESTR.c_str());
if (RETVAL >= 0) {
m_szWLDisplaySocket = CANDIDATESTR;
Debug::log(LOG, "wl_display_add_socket for {} succeeded with {}", CANDIDATESTR, RETVAL);
break;
} else
Debug::log(WARN, "wl_display_add_socket for {} returned {}: skipping candidate {}", CANDIDATESTR, RETVAL, candidate);
}
}