3 files changed, 51 insertions, 0 deletions
diff --git a/api/error.h b/api/error.h
index de7d4b2..af85bd9 100644
--- a/api/error.h
+++ b/api/error.h
@@ -18,5 +18,8 @@
 #define EOVERFLOW 15
 #define EBADCALL 16
 #define EPERM 17
+#define EBADPROC 18
+#define ENOMAIL 19
+#define ETIMEOUT 20
 
 #endif
diff --git a/api/process.h b/api/process.h
new file mode 100644
index 0000000..080e001
--- /dev/null
+++ b/api/process.h
@@ -0,0 +1,8 @@
+#ifndef _JOVE_API_PROCESS_H
+#define _JOVE_API_PROCESS_H 1
+
+#include <stdint.h>
+
+typedef intmax_t pid_t;
+
+#endif
diff --git a/api/syscall.h b/api/syscall.h
index a116177..2502621 100644
--- a/api/syscall.h
+++ b/api/syscall.h
@@ -4,6 +4,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "process.h"
 #include "obj.h"
 
 /* General syscall behavior:
@@ -123,6 +124,45 @@ struct syscall_pagedir_unmap
     objpath_part_t none_path[];
 };
 
+/**JOVE_OBJ_PCB syscalls.
+ * */
+
+enum
+{
+    _SYSCALL_PCB_NONE = 0,
+    SYSCALL_PCB_YIELD,
+    SYSCALL_PCB_SEND,
+    SYSCALL_PCB_RECV
+};
+
+#define SYSCALL_PERM_PCB_YIELD (JOVE_PERM_WRITE)
+#define SYSCALL_PERM_PCB_SEND (JOVE_PERM_MUTATE)
+#define SYSCALL_PERM_PCB_RECV (JOVE_PERM_MUTATE)
+
+#define SYSCALL_PERM_PCB_SEND_TGT (JOVE_PERM_MUTATE)
+#define SYSCALL_PERM_PCB_RECV_DST (JOVE_PERM_MUTATE)
+
+struct syscall_pcb_yield 
+{
+    pid_t yield_target;
+};
+
+struct syscall_pcb_send
+{
+    pid_t send_target;
+    uintmax_t send_timeout;
+    uint16_t send_path_length;
+    objpath_part_t send_path[];
+};
+
+struct syscall_pcb_recv
+{
+    pid_t recv_target;
+    uintmax_t recv_timeout;
+    uint16_t recv_path_length;
+    objpath_part_t recv_path[];
+};
+
 /**JOVE_OBJ_INITRD_FILE syscalls
  * */