fixup! Implement isatty

src/platform/src/linux/mod.rs

@@ -3,6 +3,8 @@ use core::{mem, ptr};
 use errno;
 use types::*;
 
+const TIOCGWINSZ: u32 = 0x5413;
+
 const AT_FDCWD: c_int = -100;
 const AT_EMPTY_PATH: c_int = 0x1000;
 const AT_REMOVEDIR: c_int = 0x200;
@@ -215,9 +217,15 @@ pub fn getuid() -> uid_t {
 }
 
 pub fn ioctl(fd: c_int, request: c_ulong, out: *mut c_void) -> c_int {
+    // TODO: Somehow support varargs to syscall??
     e(unsafe { syscall!(IOCTL, fd, request, out) }) as c_int
 }
 
+pub fn isatty(fd: c_int) -> c_int {
+    let mut winsize = winsize::default();
+    (ioctl(fd, TIOCGWINSZ as c_ulong, &mut winsize as *mut _ as *mut c_void) == 0) as c_int
+}
+
 pub fn kill(pid: pid_t, sig: c_int) -> c_int {
     e(unsafe { syscall!(KILL, pid, sig) }) as c_int
 }

src/platform/src/redox/mod.rs

@@ -470,6 +470,15 @@ pub fn getuid() -> uid_t {
     e(syscall::getuid()) as pid_t
 }
 
+pub fn isatty(fd: c_int) -> c_int {
+    syscall::dup(fd as usize, b"termios")
+        .map(|fd| {
+            let _ = syscall::close(fd);
+            1
+        })
+        .unwrap_or(0)
+}
+
 pub fn kill(pid: pid_t, sig: c_int) -> c_int {
     e(syscall::kill(pid, sig as usize)) as c_int
 }

src/platform/src/types.rs

@@ -188,3 +188,12 @@ pub struct dirent {
     pub d_type: c_uchar,
     pub d_name: [c_char; 256]
 }
+
+#[repr(C)]
+#[derive(Default)]
+pub struct winsize {
+    ws_row: c_ushort,
+    ws_col: c_ushort,
+    ws_xpixel: c_ushort,
+    ws_ypixel: c_ushort
+}