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| author | Ulrich Drepper <drepper@redhat.com> | 2010-03-24 14:59:43 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2010-03-24 14:59:43 -0700 |
| commit | 085f930b8f263a0e0c87b5189c73f23c6991c556 (patch) | |
| tree | 9a9ad5e36bd2696b5f1a15303af6e7e92176dc33 /sysdeps/unix/sysv/linux/mmap64.c | |
| parent | 7749bf5fe6ac0464db10a3a17a31121517f92530 (diff) | |
| download | glibc-085f930b8f263a0e0c87b5189c73f23c6991c556.tar.gz glibc-085f930b8f263a0e0c87b5189c73f23c6991c556.tar.xz glibc-085f930b8f263a0e0c87b5189c73f23c6991c556.zip | |
Allow variable shift values in mmap2.
Diffstat (limited to 'sysdeps/unix/sysv/linux/mmap64.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/mmap64.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/mmap64.c b/sysdeps/unix/sysv/linux/mmap64.c index d3c68cd106..85c801d501 100644 --- a/sysdeps/unix/sysv/linux/mmap64.c +++ b/sysdeps/unix/sysv/linux/mmap64.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1999,2000,2001,2002,2006 Free Software Foundation, Inc. +/* Copyright (C) 1999,2000,2001,2002,2006,2010 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Jakub Jelinek <jakub@redhat.com>, 1999. @@ -30,8 +30,13 @@ #ifdef __NR_mmap2 /* This is always 12, even on architectures where PAGE_SHIFT != 12. */ -# ifndef MMAP2_PAGE_SHIFT -# define MMAP2_PAGE_SHIFT 12 +# if MMAP2_PAGE_SHIFT == -1 +static int page_shift; +# else +# ifndef MMAP2_PAGE_SHIFT +# define MMAP2_PAGE_SHIFT 12 +# endif +# define page_shift MMAP2_PAGE_SHIFT # endif # ifndef __ASSUME_MMAP2_SYSCALL @@ -44,7 +49,15 @@ void * __mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset) { #ifdef __NR_mmap2 - if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) +# ifdef MMAP2_PAGE_SHIFT == -1 + if (page_shift == 0) + { + int page_size = getpagesize (); + while ((1 << ++page_shift) != page_size) + ; + } +# endif + if (offset & ((1 << page_shift) - 1)) { __set_errno (EINVAL); return MAP_FAILED; |