2 files changed, 2 insertions, 0 deletions
diff --git a/userland/libc/include/syscall.h b/userland/libc/include/syscall.h
index 32d7b33..135c669 100644
--- a/userland/libc/include/syscall.h
+++ b/userland/libc/include/syscall.h
@@ -38,6 +38,7 @@
 #define SYS_SIGACTION 30
 #define SYS_CHDIR 31
 #define SYS_GETCWD 32
+#define SYS_ISATTY 33
 
 int syscall(uint32_t eax, uint32_t ebx, uint32_t ecx, uint32_t edx,
             uint32_t esi, uint32_t edi);
diff --git a/userland/libc/include/unistd.h b/userland/libc/include/unistd.h
index 89c48d0..d8c8b9d 100644
--- a/userland/libc/include/unistd.h
+++ b/userland/libc/include/unistd.h
@@ -23,4 +23,5 @@ void msleep(uint32_t ms); // not standard
 uint32_t uptime(void);    // not standard
 int chdir(const char *path);
 char *getcwd(char *buf, size_t size);
+int isatty(int fd);
 #endif