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feat: add is_terminal_attached syscall

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daniel
2026-08-27 18:11:21 +02:00
parent 8afadb44cb
commit c8264b92a9
11 changed files with 46 additions and 3 deletions
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kernel/src/Api/Syscall.cpp
+4 -1
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@@ -626,6 +626,8 @@ namespace montauk::abi {
return 0;
}
case SYS_TERMINAL_ATTACHED:
return Sys_TerminalAttached();
default:
return -1;
}
@@ -652,7 +654,8 @@ namespace montauk::abi {
Hal::WriteMSR(Hal::IA32_FMASK, 0x200);
Kt::KernelLogStream(Kt::OK, "Syscall") << "SYSCALL/SYSRET initialized (LSTAR="
<< kcp::hex << (uint64_t)SyscallEntry << kcp::dec << ", 171 syscall slots)";
<< kcp::hex << (uint64_t)SyscallEntry << kcp::dec << ", "
<< (SYS_TERMINAL_ATTACHED + 1) << " syscall slots)";
}
}
kernel/src/Api/Syscall.hpp
+3
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@@ -160,6 +160,9 @@ namespace montauk::abi {
/* Userspace log */
static constexpr uint64_t SYS_LOG_WRITE = 176;
/* Process terminal attachment */
static constexpr uint64_t SYS_TERMINAL_ATTACHED = 177;
// Audio control commands (for SYS_AUDIOCTL).
//
// Commands 0..3 act on the stream named by the handle argument.
kernel/src/Api/Terminal.hpp
+5
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@@ -12,6 +12,11 @@
namespace montauk::abi {
static int Sys_TerminalAttached() {
auto* proc = Sched::GetCurrentProcessPtr();
return proc != nullptr && proc->redirected && proc->ioOutHandle >= 0;
}
static void Sys_Print(const char* text) {
auto* proc = Sched::GetCurrentProcessPtr();
if (proc && proc->redirected) {
programs/include/Api/Syscall.hpp
+1
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@@ -240,6 +240,7 @@ namespace montauk::abi {
static constexpr uint64_t SYS_SPAWN_ENV = 173;
static constexpr uint64_t SYS_LOG_WRITE = 176; // (logMessage) -> 0
static constexpr uint64_t SYS_TERMINAL_ATTACHED = 177; // () -> 1 when connected to a userspace terminal
// Tunable parameters (for SYS_SDR_SETPARAM / SYS_SDR_GETPARAM).
static constexpr int SDR_PARAM_FREQ = 0; // center frequency, Hz
programs/include/libc/montauk.h
+5
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@@ -200,6 +200,7 @@ extern "C" {
#define MTK_SYS_SETSESSION 174
#define MTK_SYS_KILLSESSION 175
#define MTK_SYS_LOG_WRITE 176
#define MTK_SYS_TERMINAL_ATTACHED 177
/* @SYSCALLS-END */
#define MTK_SOCK_TCP 1
@@ -419,6 +420,10 @@ static inline int mtk_getpid(void) {
return (int)_mtk_syscall0(MTK_SYS_GETPID);
}
static inline int mtk_terminal_attached(void) {
return (int)_mtk_syscall0(MTK_SYS_TERMINAL_ATTACHED) != 0;
}
static inline int mtk_spawn(const char *path, const char *args) {
return (int)_mtk_syscall2(MTK_SYS_SPAWN, (long)path, (long)args);
}
programs/include/montauk/syscall.h
+5
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@@ -438,6 +438,11 @@ namespace montauk {
return syscall1(montauk::abi::SYS_LOG_WRITE, (uint64_t)logMessage);
}
// True when stdout is connected to a redirected userspace terminal.
inline bool terminal_attached() {
return syscall0(montauk::abi::SYS_TERMINAL_ATTACHED) != 0;
}
// I/O redirection
inline int spawn_redir(const char* path, const char* args = nullptr) {
return (int)syscall2(montauk::abi::SYS_SPAWN_REDIR, (uint64_t)path, (uint64_t)args);
programs/man/syscalls.2
+9
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@@ -422,6 +422,10 @@
Read from the kernel ring log buffer.
int64_t montauk::read_log(char* buf, uint64_t size);
.B SYS_LOG_WRITE (176)
Append a userspace message to the system log.
int64_t montauk::write_log(const char* message);
.SH I/O REDIRECTION
Used by the terminal app and similar programs to run a child
process with its console I/O captured instead of going directly
@@ -447,6 +451,11 @@
Tell a redirected child its terminal dimensions changed.
int montauk::childio_settermsz(int childPid, int cols, int rows);
.B SYS_TERMINAL_ATTACHED (177)
Return 1 when the calling process has a redirected userspace
terminal output stream, otherwise return 0.
bool montauk::terminal_attached();
.SH WINDOW SERVER
Window server syscalls are used by GUI programs to create and
drive an on-screen window (see montauk/Window.hpp for the
template/docs/syscalls.md
+1
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@@ -32,6 +32,7 @@ void exit(int code); // Terminate process (nore
void yield(); // Yield CPU to scheduler
void sleep_ms(uint64_t ms); // Sleep for milliseconds
int getpid(); // Get current process ID
bool terminal_attached(); // Whether stdout is connected to a userspace terminal
int spawn(const char* path, const char* args); // Spawn child, inheriting environment
int waitpid(int pid); // Wait for process to exit
int kill(int pid); // Kill a process
template/sysroot/include/Api/Syscall.hpp
+1
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@@ -240,6 +240,7 @@ namespace montauk::abi {
static constexpr uint64_t SYS_SPAWN_ENV = 173;
static constexpr uint64_t SYS_LOG_WRITE = 176; // (logMessage) -> 0
static constexpr uint64_t SYS_TERMINAL_ATTACHED = 177; // () -> 1 when connected to a userspace terminal
// Tunable parameters (for SYS_SDR_SETPARAM / SYS_SDR_GETPARAM).
static constexpr int SDR_PARAM_FREQ = 0; // center frequency, Hz
template/sysroot/include/libc/montauk.h
+5
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@@ -200,6 +200,7 @@ extern "C" {
#define MTK_SYS_SETSESSION 174
#define MTK_SYS_KILLSESSION 175
#define MTK_SYS_LOG_WRITE 176
#define MTK_SYS_TERMINAL_ATTACHED 177
/* @SYSCALLS-END */
#define MTK_SOCK_TCP 1
@@ -419,6 +420,10 @@ static inline int mtk_getpid(void) {
return (int)_mtk_syscall0(MTK_SYS_GETPID);
}
static inline int mtk_terminal_attached(void) {
return (int)_mtk_syscall0(MTK_SYS_TERMINAL_ATTACHED) != 0;
}
static inline int mtk_spawn(const char *path, const char *args) {
return (int)_mtk_syscall2(MTK_SYS_SPAWN, (long)path, (long)args);
}
template/sysroot/include/montauk/syscall.h
+5
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@@ -438,6 +438,11 @@ namespace montauk {
return syscall1(montauk::abi::SYS_LOG_WRITE, (uint64_t)logMessage);
}
// True when stdout is connected to a redirected userspace terminal.
inline bool terminal_attached() {
return syscall0(montauk::abi::SYS_TERMINAL_ATTACHED) != 0;
}
// I/O redirection
inline int spawn_redir(const char* path, const char* args = nullptr) {
return (int)syscall2(montauk::abi::SYS_SPAWN_REDIR, (uint64_t)path, (uint64_t)args);