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Write more memory mapping tests

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Microsoft claims to support COW but it's probably not true.
This commit is contained in:
Justine Tunney 2021-02-04 18:24:33 -08:00
parent 74d48f7cb6
commit 2fdc19e7a7
6 changed files with 83 additions and 29 deletions
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16
test/libc/runtime/mmap_test.c
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@ -120,6 +120,22 @@ TEST(mmap, fileOffset) {
EXPECT_NE(-1, close(fd));
}
TEST(mmap, mapPrivate_writesDontChangeFile) {
int fd;
char *map, buf[5];
ASSERT_NE(-1, (fd = open("foo", O_CREAT | O_RDWR, 0644)));
EXPECT_NE(-1, ftruncate(fd, FRAMESIZE));
EXPECT_NE(-1, pwrite(fd, "hello", 5, 0));
ASSERT_NE(MAP_FAILED, (map = mmap(NULL, FRAMESIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE, fd, 0)));
memcpy(map, "there", 5);
EXPECT_NE(-1, msync(map, FRAMESIZE, MS_SYNC));
EXPECT_NE(-1, munmap(map, FRAMESIZE));
EXPECT_NE(-1, pread(fd, buf, 5, 0));
EXPECT_EQ(0, memcmp(buf, "hello", 5), "%#.*s", 5, buf);
EXPECT_NE(-1, close(fd));
}
TEST(isheap, nullPtr) {
ASSERT_FALSE(isheap(NULL));
}