Changeset 95c675b in mainline for uspace/lib/c/generic/perm.c

Timestamp:

2017-10-17T13:11:35Z (8 years ago)

Author:

Ondřej Hlavatý <aearsis@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

60af4cdb

Parents:

dbf32b1 (diff), a416d070 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge mainline

File:

• uspace/lib/c/generic/perm.c (moved) (moved from uspace/lib/c/include/rwlock.h ) (2 diffs)

uspace/lib/c/generic/perm.c

@@ -1 +1 @@
 /*
- * Copyright (c) 2008 Jakub Jermar
+ * Copyright (c) 2006 Jakub Jermar
  * All rights reserved.
  *
@@ -31 +31 @@
  */
 /**
- * @file
- * @brief       This file contains rwlock API and provides its fake
- *              implementation based on futexes.
+ * @file  perm.c
+ * @brief Functions to grant/revoke permissions to/from a task.
  */
 
-#ifndef LIBC_RWLOCK_H_
-#define LIBC_RWLOCK_H_
+#include <perm.h>
+#include <task.h>
+#include <libc.h>
+#include <types/common.h>
 
-#include <atomic.h>
-#include <futex.h>
+/** Grant permissions to a task.
+ *
+ * @param id    Destination task ID.
+ * @param perms Permissions to grant.
+ *
+ * @return Zero on success or a value from @ref errno.h on failure.
+ *
+ */
+int perm_grant(task_id_t id, unsigned int perms)
+{
+#ifdef __32_BITS__
+        sysarg64_t arg = (sysarg64_t) id;
+        return __SYSCALL2(SYS_PERM_GRANT, (sysarg_t) &arg, (sysarg_t) perms);
+#endif
+        
+#ifdef __64_BITS__
+        return __SYSCALL2(SYS_PERM_GRANT, (sysarg_t) id, (sysarg_t) perms);
+#endif
+}
 
-typedef atomic_t rwlock_t;
-
-#define RWLOCK_INITIALIZE(rwlock)       \
-    rwlock_t rwlock = FUTEX_INITIALIZER
-
-#define rwlock_initialize(rwlock)       futex_initialize((rwlock), 1)
-#define rwlock_read_lock(rwlock)        futex_lock((rwlock))
-#define rwlock_write_lock(rwlock)       futex_lock((rwlock))
-#define rwlock_read_unlock(rwlock)      futex_unlock((rwlock))
-#define rwlock_write_unlock(rwlock)     futex_unlock((rwlock))
-
+/** Revoke permissions from a task.
+ *
+ * @param id    Destination task ID.
+ * @param perms Permissions to revoke.
+ *
+ * @return Zero on success or a value from @ref errno.h on failure.
+ *
+ */
+int perm_revoke(task_id_t id, unsigned int perms)
+{
+#ifdef __32_BITS__
+        sysarg64_t arg = (sysarg64_t) id;
+        return __SYSCALL2(SYS_PERM_REVOKE, (sysarg_t) &arg, (sysarg_t) perms);
 #endif
+        
+#ifdef __64_BITS__
+        return __SYSCALL2(SYS_PERM_REVOKE, (sysarg_t) id, (sysarg_t) perms);
+#endif
+}
 
 /** @}