Changeset 12fdd28 in mainline

Timestamp:

2006-05-29T17:08:19Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

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

Children:

ad37437

Parents:

a449065

Message:

Better SYS_IO

File:

• generic/src/syscall/syscall.c (modified) (1 diff)

generic/src/syscall/syscall.c

@@ -48 +48 @@
 #include <sysinfo/sysinfo.h>
 
+/** Print using kernel facility
+ *
+ * Some simulators can print only through kernel. Userspace can use
+ * this syscall to facilitate it.
+ */
 static __native sys_io(int fd, const void * buf, size_t count) 
 {
-//      return count; /*Syscall deprecated*/
-        // TODO: buf sanity checks and a lot of other stuff ...
+        size_t i;
+        char *data;
+        int rc;
 
-        size_t i;
+        if (count > PAGE_SIZE)
+                return ELIMIT;
+
+        data = malloc(count, 0);
+        if (!data)
+                return ENOMEM;
         
+        rc = copy_from_uspace(data, buf, count);
+        if (rc) {
+                free(data);
+                return rc;
+        }
+
         for (i = 0; i < count; i++)
-                putchar(((char *) buf)[i]);
+                putchar(data[i]);
+        free(data);
         
         return count;