Changeset 1a60fee in mainline

Timestamp:

2008-05-15T18:28:50Z (16 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

4452366

Parents:

e1f51712

Message:

Do not attempt to malloc() zero bytes of memory during VFS_READ at end of file.

Files:

• kernel/generic/src/ipc/sysipc.c (modified) (2 diffs)
• uspace/app/tester/vfs/vfs1.c (modified) (1 diff)

kernel/generic/src/ipc/sysipc.c

@@ -244 +244 @@
                         size_t max_size = IPC_GET_ARG2(*olddata);
                         size_t size = IPC_GET_ARG2(answer->data);
-                        if (size <= max_size) {
+                        if (size && size <= max_size) {
                                 /*
                                  * Copy the destination VA so that this piece of
@@ -259 +259 @@
                                         answer->buffer = NULL;
                                 }
+                        } else if (!size) {
+                                IPC_SET_RETVAL(answer->data, EOK);
                         } else {
                                 IPC_SET_RETVAL(answer->data, ELIMIT);

uspace/app/tester/vfs/vfs1.c

@@ -87 +87 @@
         char buf[10];
 
-        cnt = read(fd0, buf, sizeof(buf));
-        if (cnt < 0)
-                return "read() failed.\n";
-
-        if (!quiet)
-                printf("read %d bytes: \"%.*s\", fd=%d\n", cnt, cnt, buf, fd0);
+        while ((cnt = read(fd0, buf, sizeof(buf)))) {
+                if (cnt < 0)
+                        return "read() failed.\n";
+                if (!quiet)
+                        printf("read %d bytes: \"%.*s\", fd=%d\n", cnt, cnt,
+                            buf, fd0);
+        }
 
         close(fd0);