Add a /bin/tty command that prints the current tty.

Also fix ttyname() syscall to include "/dev/" in the name.

Kernel/VirtualConsole.cpp

@@ -400,7 +400,7 @@ void VirtualConsole::onTTYWrite(byte ch)
 
 String VirtualConsole::ttyName() const
 {
-    char buf[8];
-    ksprintf(buf, "tty%u", m_index);
+    char buf[16];
+    ksprintf(buf, "/dev/tty%u", m_index);
     return String(buf);
 }

Kernel/sync.sh

@@ -18,6 +18,7 @@ cp ../Userland/clear mnt/bin/clear
 cp ../Userland/tst mnt/bin/tst
 cp ../Userland/mm mnt/bin/mm
 cp ../Userland/kill mnt/bin/kill
+cp ../Userland/tty mnt/bin/tty
 sh sync-local.sh
 cp kernel.map mnt/
 umount mnt

Userland/.gitignore

@@ -15,3 +15,4 @@ clear
 tst
 mm
 kill
+tty

Userland/Makefile

@@ -13,7 +13,8 @@ OBJS = \
        clear.o \
        tst.o \
        mm.o \
-       kill.o
+       kill.o \
+       tty.o
 
 APPS = \
        id \
@@ -30,7 +31,8 @@ APPS = \
        clear \
        tst \
        mm \
-       kill
+       kill \
+       tty
 
 ARCH_FLAGS =
 STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
@@ -95,6 +97,9 @@ mm: mm.o
 kill: kill.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+tty: tty.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 

Userland/sh.cpp

@@ -11,6 +11,7 @@
 struct GlobalState {
     String cwd;
     String username;
+    const char* ttyname_short { nullptr };
     char ttyname[32];
     char hostname[32];
 };
@@ -160,7 +161,7 @@ static void greeting()
         perror("uname");
         return;
     }
-    printf("\n%s/%s on %s\n\n", uts.sysname, uts.machine, g->ttyname);
+    printf("\n%s/%s on %s\n\n", uts.sysname, uts.machine, g->ttyname_short);
 }
 
 int main(int, char**)
@@ -172,6 +173,8 @@ int main(int, char**)
     rc = ttyname_r(0, g->ttyname, sizeof(g->ttyname));
     if (rc < 0)
         perror("ttyname_r");
+    else
+        g->ttyname_short = strrchr(g->ttyname, '/') + 1;
     {
         auto* pw = getpwuid(getuid());
         if (pw)

Userland/tty.cpp

@@ -0,0 +1,13 @@
+#include <LibC/stdio.h>
+#include <LibC/unistd.h>
+
+int main(int, char**)
+{
+    char* tty = ttyname(0);
+    if (!tty) {
+        perror("Error");
+        return 1;
+    }
+    printf("%s\n", tty);
+    return 0;
+}