From mmunmap man pages:. Assuming all the parameters are correctly given, Then it will not fail. This flag is ignored. Use of this option is discouraged. The actual reads from disk are performed in a “lazy” manner, after a specific location is accessed. If the binary image itself is position independent, two things can happen: This makes it possible to unmap part of the stack and have the kernel magically remap it with a zero page upon the next access.
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munmap()函数 Unix/Linux – Unix/Linux系统调用
Alexandre Lavoie 7, 3 22 As mentioned previously, we need to know the distance of the freed chunk and the target region to unmap the target while also taking care of page alignment. While this circumvents the stack cache problem of the other direction, avoiding crashes might prove linuux be tricky, if the thread is scheduled to run in the meantime. The file may not actually.
For example, for munmap this may mean that the address range from addr and continuing for a length of len is outside the valid range allowed for a process. Note that some items appear on both lists. Sign up or log in Sign up using Google. But if you pass pointer you got from mmapand correct size, then it will not fail.
LINUX KERNEL INTERNALS: mmap() and munmap()
munnmap For a file that is. If addr is NULL, then the kernel chooses the address at which to. In emergency situations, you may invoke syscalls from inside external processes by using gdb: This may mean wasted bytes at the beginning and end of the allocation, so the leading and trailing space is returned via free. Linux error from munmap Ask Question.
Don’t clear anonymous pages. The value zero or NULL is not a valid starting address. Sign up or log in Sign up using Google.
Assuming all the parameters are correctly given, for example, see the following code snippet. Post as a guest Name.
For a file that is not a multiple of the page size, the remaining memory is zeroed when mapped, and writes to that region are not written out to the file.
My munmpa is that this is caused by the way vm areas are split by munmap but then again, out of my depth here.