Implement get_job_no() via control page

2 files changed, 8 insertions, 5 deletions

diff --git a/src/syscalls.c b/src/syscalls.c
index 0ee1a80..0950ca6 100644
--- a/src/syscalls.c
+++ b/src/syscalls.c
@@ -9,6 +9,7 @@
 #include <unistd.h>
 
 #include "litmus.h"
+#include "internal.h"
 
 /*      Syscall stub for setting RT mode and scheduling options */
 
@@ -54,7 +55,13 @@ int litmus_unlock(int od)
 
 int get_job_no(unsigned int *job_no)
 {
-        return syscall(__NR_query_job_no, job_no);
+        struct control_page* cp = get_ctrl_page();
+        if (likely(cp != NULL)) {
+                *job_no = cp->job_index;
+                return 0;
+        } else {
+                return -1;
+        }
 }
 
 int wait_for_job_release(unsigned int job_no)
diff --git a/tests/core_api.c b/tests/core_api.c
index 8cb5588..95ca69b 100644
--- a/tests/core_api.c
+++ b/tests/core_api.c
@@ -105,13 +105,9 @@ TESTCASE(accept_valid_priorities, P_FP,
 TESTCASE(job_control_non_rt, ALL,
          "reject job control for non-rt tasks")
 {
-        unsigned int job_no;
-
         SYSCALL_FAILS( EINVAL, sleep_next_period() );
 
         SYSCALL_FAILS( EINVAL, wait_for_job_release(0) );
-
-        SYSCALL_FAILS( EPERM, get_job_no(&job_no) );
 }