Messages in this thread | | | Date | Fri, 29 Jun 2007 14:52:22 -0500 | From | William Tambe <> | Subject | Concerning a post that you made about expandable anonymous shared mappings |
| |
I read a post that you made about not being able to expand anonymous shared mapping with mremap(). And I am actually having that issue now.
You made the post in 2004 and we are now in 2007. I would like to know if that feature was added because the code below always fail with bus error on my machine. I use glibc 2.5
Thank you for helping.
#define _GNU_SOURCE #include <sys/mman.h> #include <unistd.h>
#include <stdio.h>
main() { void *ptr; if ((ptr=mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_SHARED|MAP_GROWSDOWN, 0, 0)) == -1) { printf("failed to mmap\n"); return; }
if ((ptr=mremap(ptr, 4096, 8192, MREMAP_MAYMOVE)) == -1) { printf("failed to mremap\n"); return; }
//why does this failed. I am well in the interval [4096, 8192] *(unsigned int *)(ptr + 4096 + 8)= 10; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |