mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 23:00:22 +00:00
17 lines
705 B
C
17 lines
705 B
C
|
/* As default architectures with sizeof (off_t) < sizeof (off64_t) the mmap is
|
||
|
|
implemented with __SYS_mmap2 syscall and the offset is represented in
|
||
|
|
multiples of page size. For offset larger than
|
||
|
|
'1 << (page_shift + 8 * sizeof (off_t))' (that is, 1<<44 on system with
|
||
|
|
page size of 4096 bytes) the system call silently truncates the offset.
|
||
|
|
For this case, glibc mmap implementation returns EINVAL. */
|
||
|
|
|
||
|
|
/* Return the maximum value expected as offset argument in mmap64 call. */
|
||
|
|
static inline uint64_t
|
||
|
|
mmap64_maximum_offset (long int page_shift)
|
||
|
|
{
|
||
|
|
if (sizeof (off_t) < sizeof (off64_t))
|
||
|
|
return (UINT64_C(1) << (page_shift + (8 * sizeof (off_t)))) - 1;
|
||
|
|
else
|
||
|
|
return UINT64_MAX;
|
||
|
|
}
|