From f2eafdf1057ffbd513e1238ddcb5262237825aff Mon Sep 17 00:00:00 2001
From: NotPppp1116 <264624490+NotPppp1116@users.noreply.github.com>
Date: Tue, 14 Jul 2026 16:32:05 +0100
Subject: [PATCH] hyprctl: handle partial IPC transfers (#15408)

Co-authored-by: Pppp1116 <ACCOUNT1_NOREPLY>
---
 hyprctl/src/main.cpp               | 46 ++++++++++++++++++++---------
 hyprpm/src/core/HyprlandSocket.cpp | 47 ++++++++++++++++++++----------
 2 files changed, 64 insertions(+), 29 deletions(-)

diff --git a/hyprctl/src/main.cpp b/hyprctl/src/main.cpp
index d32af74f2..ae2dfe6c0 100644
--- a/hyprctl/src/main.cpp
+++ b/hyprctl/src/main.cpp
@@ -1,6 +1,7 @@
 #include <re2/re2.h>
 
 #include <cctype>
+#include <cerrno>
 #include <netdb.h>
 #include <netinet/in.h>
 #include <cstdio>
@@ -53,6 +54,24 @@ void log(const std::string_view str) {
     std::println("{}", str);
 }
 
+static bool writeAll(const int fd, std::string_view data) {
+    size_t totalWritten = 0;
+    while (totalWritten < data.size()) {
+        const auto written = write(fd, data.data() + totalWritten, data.size() - totalWritten);
+        if (written > 0) {
+            totalWritten += sc<size_t>(written);
+            continue;
+        }
+
+        if (written < 0 && errno == EINTR)
+            continue;
+
+        return false;
+    }
+
+    return true;
+}
+
 static int getUID() {
     const auto UID   = getuid();
     const auto PWUID = getpwuid(UID);
@@ -217,9 +236,7 @@ int request(std::string_view arg, int minArgs = 0, bool needRoll = false) {
         return 4;
     }
 
-    auto sizeWritten = write(SERVERSOCKET, arg.data(), arg.size());
-
-    if (sizeWritten < 0) {
+    if (!writeAll(SERVERSOCKET, arg)) {
         log("Couldn't write (5)");
         return 5;
     }
@@ -234,21 +251,23 @@ int request(std::string_view arg, int minArgs = 0, bool needRoll = false) {
     // read all data until server closes the connection
     // this handles partial writes on the server side under high load
     while (true) {
-        sizeWritten = read(SERVERSOCKET, buffer, BUFFER_SIZE);
+        const auto sizeRead = read(SERVERSOCKET, buffer, BUFFER_SIZE);
 
-        if (sizeWritten < 0) {
+        if (sizeRead < 0) {
+            if (errno == EINTR)
+                continue;
             if (errno == EWOULDBLOCK)
                 log("Hyprland IPC didn't respond in time\n");
             log("Couldn't read (6)");
             return 6;
         }
 
-        if (sizeWritten == 0) {
+        if (sizeRead == 0) {
             // server closed connection, we're done
             break;
         }
 
-        reply += std::string(buffer, sizeWritten);
+        reply.append(buffer, sc<size_t>(sizeRead));
     }
 
     close(SERVERSOCKET);
@@ -289,25 +308,26 @@ int requestIPC(std::string_view filename, std::string_view arg) {
     arg = arg.substr(arg.find_first_of('/') + 1); // strip flags
     arg = arg.substr(arg.find_first_of(' ') + 1); // strip "hyprpaper"
 
-    auto sizeWritten = write(SERVERSOCKET, arg.data(), arg.size());
-
-    if (sizeWritten < 0) {
+    if (!writeAll(SERVERSOCKET, arg)) {
         log("Couldn't write (4)");
         return 4;
     }
     constexpr size_t BUFFER_SIZE         = 8192;
     char             buffer[BUFFER_SIZE] = {0};
 
-    sizeWritten = read(SERVERSOCKET, buffer, BUFFER_SIZE);
+    ssize_t          sizeRead = 0;
+    do {
+        sizeRead = read(SERVERSOCKET, buffer, BUFFER_SIZE);
+    } while (sizeRead < 0 && errno == EINTR);
 
-    if (sizeWritten < 0) {
+    if (sizeRead < 0) {
         log("Couldn't read (5)");
         return 5;
     }
 
     close(SERVERSOCKET);
 
-    log(std::string(buffer));
+    log(std::string(buffer, sc<size_t>(sizeRead)));
 
     return 0;
 }
diff --git a/hyprpm/src/core/HyprlandSocket.cpp b/hyprpm/src/core/HyprlandSocket.cpp
index 47142e549..2609dae29 100644
--- a/hyprpm/src/core/HyprlandSocket.cpp
+++ b/hyprpm/src/core/HyprlandSocket.cpp
@@ -1,4 +1,5 @@
 #include "HyprlandSocket.hpp"
+#include <cerrno>
 #include <pwd.h>
 #include <sys/socket.h>
 #include "../helpers/StringUtils.hpp"
@@ -10,6 +11,24 @@
 
 using namespace Hyprutils::Memory;
 
+static bool writeAll(const int fd, std::string_view data) {
+    size_t totalWritten = 0;
+    while (totalWritten < data.size()) {
+        const auto written = write(fd, data.data() + totalWritten, data.size() - totalWritten);
+        if (written > 0) {
+            totalWritten += sc<size_t>(written);
+            continue;
+        }
+
+        if (written < 0 && errno == EINTR)
+            continue;
+
+        return false;
+    }
+
+    return true;
+}
+
 static int getUID() {
     const auto UID   = getuid();
     const auto PWUID = getpwuid(UID);
@@ -54,9 +73,7 @@ std::string NHyprlandSocket::send(const std::string& cmd) {
         return "";
     }
 
-    auto sizeWritten = write(SERVERSOCKET, cmd.c_str(), cmd.length());
-
-    if (sizeWritten < 0) {
+    if (!writeAll(SERVERSOCKET, cmd)) {
         std::println("{}", failureString("Couldn't write (5)"));
         return "";
     }
@@ -65,22 +82,20 @@ std::string NHyprlandSocket::send(const std::string& cmd) {
     constexpr size_t BUFFER_SIZE         = 8192;
     char             buffer[BUFFER_SIZE] = {0};
 
-    sizeWritten = read(SERVERSOCKET, buffer, BUFFER_SIZE);
+    while (true) {
+        const auto sizeRead = read(SERVERSOCKET, buffer, BUFFER_SIZE);
+        if (sizeRead < 0) {
+            if (errno == EINTR)
+                continue;
 
-    if (sizeWritten < 0) {
-        std::println("{}", failureString("Couldn't read (6)"));
-        return "";
-    }
-
-    reply += std::string(buffer, sizeWritten);
-
-    while (sizeWritten == BUFFER_SIZE) {
-        sizeWritten = read(SERVERSOCKET, buffer, BUFFER_SIZE);
-        if (sizeWritten < 0) {
-            std::println("{}", failureString("Couldn't read (7)"));
+            std::println("{}", failureString("Couldn't read (6)"));
             return "";
         }
-        reply += std::string(buffer, sizeWritten);
+
+        if (sizeRead == 0)
+            break;
+
+        reply.append(buffer, sc<size_t>(sizeRead));
     }
 
     close(SERVERSOCKET);