[FS] Pipes

libc/file_io.c

@@ -69,3 +69,9 @@ SYSCALL_DEF(ioctl)
   kernel_debug("==> IOCTL - unsupported request:%lx\n", request);
   return -1;
 }
+
+SYSCALL_DEF(pipe)
+{
+  SYSCALL_INIT(int *, fd);
+  return kernel_syscall(SYS_PIPE, fd);
+}

libc/syscall_num.h

@@ -14,3 +14,5 @@
 #define SYS_FORK  0x008
 #define SYS_EXIT  0x009
 #define SYS_WAIT  0x00A
+
+#define SYS_PIPE 0x00B