Merge pull request #1750 from juj/no_copy_vfs_to_heap

no_copy_vfs_to_heap

1 files changed, 27 insertions, 0 deletions

diff --git a/tests/mmap_file.c b/tests/mmap_file.c
new file mode 100644
index 00000000..6eed95e0
--- /dev/null
+++ b/tests/mmap_file.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <sys/mman.h>
+#include <emscripten.h>
+#include <string.h>
+#include <assert.h>
+
+int main() {
+    printf("*\n");
+    FILE *f = fopen("data.dat", "r");
+    char *m;
+    m = (char*)mmap(NULL, 9000, PROT_READ, MAP_PRIVATE, fileno(f), 0);
+    for (int i = 0; i < 20; i++) putchar(m[i]);
+    assert(!strncmp(m, "data from the file .", 20));
+    munmap(m, 9000);
+    printf("\n");
+    m = (char*)mmap(NULL, 9000, PROT_READ, MAP_PRIVATE, fileno(f), 5);
+    for (int i = 0; i < 20; i++) putchar(m[i]);
+    assert(!strncmp(m, "from the file ......", 20));
+    munmap(m, 9000);
+    printf("\n*\n");
+
+#ifdef REPORT_RESULT
+    int result = 1;
+    REPORT_RESULT();
+#endif
+    return 0;
+}