带有LEGACY_MAP_MASK的MAP_SHARED_VALIDATE在mmap中产生EINVAL错误

问题描述

我了解到MAP_SHARED_VALIDATE将返回EOPNOTSUPP，并且当存在未知标志时，mmap（）将会失败，但是，当我使用LEGACY_MAP_MASK（所有均为有效标志）时，mmap（）将失败。

#define LEGACY_MAP_MASK (MAP_SHARED \
        | MAP_PRIVATE \
        | MAP_FIXED\
        | MAP_ANONYMOUS \
        | MAP_DENYWRITE \
        | MAP_EXECUTABLE \
        | MAP_UNINITIALIZED \
        | MAP_GROWSDOWN \
        | MAP_LOCKED \
        | MAP_NORESERVE \
        | MAP_POPULATE \
        | MAP_NONBLOCK \
        | MAP_STACK \
        | MAP_HUGETLB \
        | MAP_32BIT \
        | MAP_HUGE_2MB \

static int fd_file;
static void *mapped_address;

#define TEST_FILE "sample"
#define TEST_FILE_SIZE 1024
#define TEST_FILE_MODE 0600

fd_file = open(TEST_FILE,O_CREAT | O_RDWR,TEST_FILE_MODE);
mapped_address = mmap(NULL,TEST_FILE_SIZE,PROT_READ | PROT_WRITE,LEGACY_MAP_MASK |                  MAP_SHARED_VALIDATE,fd_file,0);
if (mapped_address == MAP_FAILED)
  printf("Oops mmap() failed");

错误：

mmap( ) failed with the unexpected error: EINVAL (22)

================================================ ====================

编辑：在评论回复后：

#define LEGACY_MAP_MASK (MAP_SHARED \
        | MAP_PRIVATE \
        | MAP_DENYWRITE \
        | MAP_EXECUTABLE \
        | MAP_UNINITIALIZED \
        | MAP_LOCKED \
        | MAP_NORESERVE \
        | MAP_POPULATE \
        | MAP_NONBLOCK \
        | MAP_STACK \
        | MAP_32BIT \
        | MAP_HUGE_2MB \
        | MAP_HUGE_1GB)

mapped_address = mmap(NULL,LEGACY_MAP_MASK | MAP_SHARED_VALIDATE,0);

mmap( ) is successful,

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