fix: make KF6 Pty build on Redox

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/kde/kf6-pty/source/src/kpty.cpp

@@ -439,7 +439,7 @@ void KPty::setCTty()
     setsid();
 
     // make our slave pty the new controlling terminal.
-    ioctl(d->slaveFd, TIOCSCTTY, 0);
+    ioctl(d->slaveFd, TIOCSCTTY, nullptr);
 
     // make our new process group the foreground group on the pty
     int pgrp = getpid();
@@ -448,6 +448,15 @@ void KPty::setCTty()
 
 void KPty::login(const char *user, const char *remotehost)
 {
+#ifdef __redox__
+    // Redox provides PTY allocation and terminal attributes, but it does not yet
+    // expose a utmp/wtmp database API. Keep KPty functional while making login
+    // accounting an explicit no-op on this target rather than referencing
+    // incomplete libc utmp declarations.
+    Q_UNUSED(user);
+    Q_UNUSED(remotehost);
+    return;
+#else
 #ifdef UTEMPTER_PATH
     Q_D(KPty);
 
@@ -533,10 +542,15 @@ void KPty::login(const char *user, const char *remotehost)
 #endif
 #endif
 #endif
+#endif
 }
 
 void KPty::logout()
 {
+#ifdef __redox__
+    // See KPty::login(): there is no Redox utmp/wtmp backend to update yet.
+    return;
+#else
 #ifdef UTEMPTER_PATH
     Q_D(KPty);
 
@@ -612,6 +626,7 @@ void KPty::logout()
 #endif
 #endif
 #endif
+#endif
 }
 
 bool KPty::tcGetAttr(struct ::termios *ttmode) const

local/recipes/kde/kf6-pty/source/src/kptydevice.cpp

@@ -17,6 +17,7 @@
 #include <KLocalizedString>
 
 #include <cerrno>
+#include <ctime>
 #include <fcntl.h>
 #include <signal.h>
 #include <sys/ioctl.h>
@@ -42,6 +43,18 @@
 
 #define KMAXINT ((int)(~0U >> 1))
 
+static void currentTimeval(struct timeval *tv)
+{
+#ifdef __redox__
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    tv->tv_sec = ts.tv_sec;
+    tv->tv_usec = ts.tv_nsec / 1000;
+#else
+    gettimeofday(tv, nullptr);
+#endif
+}
+
 /////////////////////////////////////////////////////
 // Helper. Remove when QRingBuffer becomes public. //
 /////////////////////////////////////////////////////
@@ -365,7 +378,7 @@ bool KPtyDevicePrivate::doWait(int msecs, bool reading)
         tv.tv_sec = msecs / 1000;
         tv.tv_usec = (msecs % 1000) * 1000;
 #ifndef Q_OS_LINUX
-        gettimeofday(&etv, nullptr);
+        currentTimeval(&etv);
         timeradd(&tv, &etv, &etv);
 #endif
         tvp = &tv;
@@ -387,7 +400,7 @@ bool KPtyDevicePrivate::doWait(int msecs, bool reading)
 
 #ifndef Q_OS_LINUX
         if (tvp) {
-            gettimeofday(&tv, nullptr);
+            currentTimeval(&tv);
             timersub(&etv, &tv, &tv);
             if (tv.tv_sec < 0) {
                 tv.tv_sec = tv.tv_usec = 0;