[PATCH 3/8] ipc: implement mach_port_set_protected_payload

[Justus Winter]

* include/mach/mach_port.defs: Add mach_port_set_protected_payload.
* ipc/mach_port.c: Implement mach_port_set_protected_payload.
---
 include/mach/mach_port.defs |    9 +++++++++
 ipc/mach_port.c             |   37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/include/mach/mach_port.defs b/include/mach/mach_port.defs
index 769d892..96a5987 100644
--- a/include/mach/mach_port.defs
+++ b/include/mach/mach_port.defs
@@ -349,3 +349,12 @@ skip; /* mach_port_create_act */
 
 #endif /* MIGRATING_THREADS */
 
+/*
+ *     Only valid for receive rights.
+ *     Set the protected payload for this right to the given value.
+ */
+
+routine mach_port_set_protected_payload(
+               task            : ipc_space_t;
+               name            : mach_port_name_t;
+               payload         : natural_t);
diff --git a/ipc/mach_port.c b/ipc/mach_port.c
index 46cb4de..8b6d68a 100644
--- a/ipc/mach_port.c
+++ b/ipc/mach_port.c
@@ -1566,3 +1566,40 @@ mach_port_set_syscall_right(task, name)
 }
 #endif
 #endif /* MIGRATING_THREADS */
+
+/*
+ *     Routine:        mach_port_set_protected_payload [kernel call]
+ *     Purpose:
+ *             Changes a receive right's protected payload.
+ *     Conditions:
+ *             Nothing locked.
+ *     Returns:
+ *             KERN_SUCCESS            Set protected payload.
+ *             KERN_INVALID_TASK       The space is null.
+ *             KERN_INVALID_TASK       The space is dead.
+ *             KERN_INVALID_NAME       The name doesn't denote a right.
+ *             KERN_INVALID_RIGHT      Name doesn't denote receive rights.
+ */
+
+kern_return_t
+mach_port_set_protected_payload(
+       ipc_space_t             space,
+       mach_port_t             name,
+       unsigned long           payload)
+{
+       ipc_port_t port;
+       kern_return_t kr;
+
+       if (space == IS_NULL)
+               return KERN_INVALID_TASK;
+
+       kr = ipc_port_translate_receive(space, name, &port);
+       if (kr != KERN_SUCCESS)
+               return kr;
+       /* port is locked and active */
+
+       ipc_port_set_protected_payload(port, payload);
+
+       ip_unlock(port);
+       return KERN_SUCCESS;
+}
-- 
1.7.10.4