diff --git a/src/tests/vm/mmap-remove.c b/src/tests/vm/mmap-remove.c new file mode 100644 index 0000000000000000000000000000000000000000..5f7444d99b7a25ccc8260d0d9cd6e05a95c287d5 --- /dev/null +++ b/src/tests/vm/mmap-remove.c @@ -0,0 +1,43 @@ +/* Deletes and closes file that is mapped into memory + and verifies that it can still be read through the mapping. */ + +#include <string.h> +#include <syscall.h> +#include "tests/vm/sample.inc" +#include "tests/lib.h" +#include "tests/main.h" + +void +test_main (void) +{ + char *actual = (char *) 0x10000000; + int handle; + mapid_t map; + size_t i; + + /* Map file. */ + CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\""); + CHECK ((map = mmap (handle, actual)) != MAP_FAILED, "mmap \"sample.txt\""); + + /* Close file and delete it. */ + close (handle); + CHECK (remove ("sample.txt"), "remove \"sample.txt\""); + CHECK (open ("sample.txt") == -1, "try to open \"sample.txt\""); + + /* Create a new file in hopes of overwriting data from the old + one, in case the file system has incorrectly freed the + file's data. */ + CHECK (create ("another", 4096 * 10), "create \"another\""); + + /* Check that mapped data is correct. */ + if (memcmp (actual, sample, strlen (sample))) + fail ("read of mmap'd file reported bad data"); + + /* Verify that data is followed by zeros. */ + for (i = strlen (sample); i < 4096; i++) + if (actual[i] != 0) + fail ("byte %zu of mmap'd region has value %02hhx (should be 0)", + i, actual[i]); + + munmap (map); +}