mmap2 - 映射文件或設備到內存

內容簡介

#include <sys/mman.h>

void *mmap2(void **start*, size_t length**, int** prot**,** int flags**, int** fd**, off_t** pgoffset**);**

描述

The  mmap2 () system call operates in exactly the same way as  mmap (2), except that the final argument specifies the offset into the file in 4kB units (instead of bytes). This enables applications that use a 32-bit  off_t  to map larger files (typically up to 2^44 bytes).

返回值

On success,  mmap2 () returns a pointer to the mapped area. On error -1 is returned and errno  is set appropriately.

錯誤

標籤

描述

EFAULT

Problem with getting the data from userspace.

遵循於

這個系統調用是Linux特有的。

注意

Glibc does not provide a wrapper for this system call; call it using  syscall (2).

mmap2() is available since Linux 2.3.31. It is Linux specific, and should be avoided in portable applications. On 32-bit systems, mmap2() is used to implement the mmap64() function that is part of the LFS (Large File Summit).

另請參閱

• getpagesize (2)

• mmap (2)

• mremap (2)

• msync (2)