[Bug 791779] v4l2src: mmap64 is not available on FreeBSD

GStreamer (GNOME Bugzilla) bugzilla at gnome.org
Fri Dec 22 03:45:03 UTC 2017


https://bugzilla.gnome.org/show_bug.cgi?id=791779

Ting-Wei Lan <lantw44 at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #365739|committed                   |none
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 Attachment #365739|0                           |1
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--- Comment #12 from Ting-Wei Lan <lantw44 at gmail.com> ---
Created attachment 365868
  --> https://bugzilla.gnome.org/attachment.cgi?id=365868&action=edit
v4l2object: Don't use mmap64 if off_t is 64-bit

The difference between mmap and mmap64 is the type of 'offset' argument.
mmap64 always uses a 64-bit interger as offset, while mmap uses off_t,
whose size can vary on different operating systems or architectures.

However, not all operating systems support mmap64. Fortunately, although
FreeBSD only has mmap, its off_t is always 64-bit regardless of
architectures, so we can simply use mmap when sizeof(off_t) == 8.

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