feat: add inherited sessions and desktop session teardown

template/docs/syscalls.md

@@ -36,6 +36,8 @@ int      spawn(const char* path, const char* args);   // Spawn child, inheriting
 int      waitpid(int pid);                            // Wait for process to exit
 int      kill(int pid);                               // Kill a process
 int      proclist(ProcInfo* buf, int max);             // List all processes (returns count)
+int      setsession();                                // Start a new inherited process session
+int      killsession(int sessionId);                  // Kill live members; repeat until zero
 ```
 
 **`ProcInfo` struct:**

template/sysroot/include/Api/Syscall.hpp

@@ -125,6 +125,8 @@ namespace montauk::abi {
     // User management
     static constexpr uint64_t SYS_SETUSER       = 92;
     static constexpr uint64_t SYS_GETUSER       = 93;
+    static constexpr uint64_t SYS_SETSESSION    = 174;
+    static constexpr uint64_t SYS_KILLSESSION   = 175;
     static constexpr uint64_t SYS_FRENAME       = 94;
     static constexpr uint64_t SYS_GETCWD        = 95;
     static constexpr uint64_t SYS_CHDIR         = 96;

template/sysroot/include/libc/montauk.h

@@ -76,6 +76,8 @@ extern "C" {
 #define MTK_SYS_GETENVIRON         171
 #define MTK_SYS_SETENVIRON         172
 #define MTK_SYS_SPAWN_ENV          173
+#define MTK_SYS_SETSESSION         174
+#define MTK_SYS_KILLSESSION        175
 #define MTK_SYS_CHILDIO_READ       50
 #define MTK_SYS_CHILDIO_WRITE      51
 #define MTK_SYS_CHILDIO_WRITEKEY   52
@@ -423,6 +425,14 @@ static inline int mtk_kill(int pid) {
     return (int)_mtk_syscall1(MTK_SYS_KILL, (long)pid);
 }
 
+static inline int mtk_setsession(void) {
+    return (int)_mtk_syscall0(MTK_SYS_SETSESSION);
+}
+
+static inline int mtk_killsession(int session_id) {
+    return (int)_mtk_syscall1(MTK_SYS_KILLSESSION, (long)session_id);
+}
+
 static inline int mtk_proclist(mtk_procinfo *buf, int max) {
     return (int)_mtk_syscall2(MTK_SYS_PROCLIST, (long)buf, (long)max);
 }

template/sysroot/include/montauk/syscall.h

@@ -456,6 +456,12 @@ namespace montauk {
     inline int kill(int pid) {
         return (int)syscall1(montauk::abi::SYS_KILL, (uint64_t)pid);
     }
+    inline int setsession() {
+        return (int)syscall0(montauk::abi::SYS_SETSESSION);
+    }
+    inline int killsession(int sessionId) {
+        return (int)syscall1(montauk::abi::SYS_KILLSESSION, (uint64_t)sessionId);
+    }
     inline int devlist(montauk::abi::DevInfo* buf, int max) {
         return (int)syscall2(montauk::abi::SYS_DEVLIST, (uint64_t)buf, (uint64_t)max);
     }