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 anderrno is set appropriately.
|EFAULT||Problem with getting the data from userspace.|
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).