Changeset 23602

Timestamp:

2008-04-21 14:41:09 (6 months ago)

Author:

zarzycki@…

Message:

<rdar://problem/5836108> Need launchd 'trykill' SPI

Location:

trunk/launchd/src

Files:

• launchd_core_logic.c (modified) (2 diffs)
• liblaunch_private.h (modified) (1 diff)
• libvproc.c (modified) (1 diff)
• libvproc_private.h (modified) (1 diff)

trunk/launchd/src/launchd_core_logic.c

@@ -702 +702 @@
         }
 
+        if (j->kill_via_shmem && (tmp = launch_data_new_bool(true))) {
+                uint32_t tmp_cnt = -1;
+
+                launch_data_dict_insert(r, tmp, LAUNCH_JOBKEY_ENABLETRANSACTIONS);
+
+                if (j->shmem) {
+                        tmp_cnt = j->shmem->vp_shmem_transaction_cnt;
+                }
+
+                if (j->sent_kill_via_shmem) {
+                        tmp_cnt++;
+                }
+
+                if ((tmp = launch_data_new_integer(tmp_cnt))) {
+                        launch_data_dict_insert(r, tmp, LAUNCH_JOBKEY_TRANSACTIONCOUNT);
+                }
+        }
+
         if (j->session_create && (tmp = launch_data_new_bool(true))) {
                 launch_data_dict_insert(r, tmp, LAUNCH_JOBKEY_SESSIONCREATE);
@@ -5709 +5727 @@
                         return 0;
                 }
+        } else if (sig == VPROC_MAGIC_TRYKILL_SIGNAL) {
+                if (!j->kill_via_shmem) {
+                        return BOOTSTRAP_NOT_PRIVILEGED;
+                }
+
+                if (!j->shmem) {
+                        j->sent_kill_via_shmem = true;
+                        job_assumes(j, runtime_kill(otherj->p, SIGKILL) != -1);
+                        return 0;
+                }
+
+                if (__sync_bool_compare_and_swap(&j->shmem->vp_shmem_transaction_cnt, 0, -1)) {
+                        j->shmem->vp_shmem_flags |= VPROC_SHMEM_EXITING;
+                        j->sent_kill_via_shmem = true;
+                        job_assumes(j, runtime_kill(otherj->p, SIGKILL) != -1);
+                        return 0;
+                }
+
+                return BOOTSTRAP_NOT_PRIVILEGED;
         } else if (otherj->p) {
                 job_assumes(j, runtime_kill(otherj->p, sig) != -1);

trunk/launchd/src/liblaunch_private.h

@@ -47 +47 @@
 #define LAUNCH_KEY_BATCHQUERY           "BatchQuery"
 
+#define LAUNCH_JOBKEY_TRANSACTIONCOUNT  "TransactionCount"
 #define LAUNCH_JOBKEY_QUARANTINEDATA    "QuarantineData"
 #define LAUNCH_JOBKEY_SANDBOXPROFILE    "SandboxProfile"

trunk/launchd/src/libvproc.c

@@ -133 +133 @@
 _vproc_transaction_try_exit(int status)
 {
-        typeof(vproc_shmem->vp_shmem_transaction_cnt) newval;
-
         if (unlikely(vproc_shmem == NULL)) {
                 return;
         }
 
-        vproc_shmem->vp_shmem_flags |= VPROC_SHMEM_EXITING;
-
-        newval = __sync_sub_and_fetch(&vproc_shmem->vp_shmem_transaction_cnt, 1);
-
-        if (newval < 0) {
+        if (__sync_bool_compare_and_swap(&vproc_shmem->vp_shmem_transaction_cnt, 0, -1)) {
+                vproc_shmem->vp_shmem_flags |= VPROC_SHMEM_EXITING;
                 _exit(status);
         }

trunk/launchd/src/libvproc_private.h

@@ -32 +32 @@
 #pragma GCC visibility push(default)
 
-/* DO NOT use this. This is a hack for launchctl */
-#define VPROC_MAGIC_UNLOAD_SIGNAL 0x4141504C
+/* DO NOT use this. This is a hack for 'launchctl' */
+#define VPROC_MAGIC_UNLOAD_SIGNAL       0x4141504C
+/* DO NOT use this. This is a hack for 'loginwindow' */
+#define VPROC_MAGIC_TRYKILL_SIGNAL      0x6161706C
 
 typedef enum {