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| author |  Nikolaus Rath <Nikolaus@rath.org> | 2017-05-25 12:48:27 -0700 |
|---|---|---|
| committer | Nikolaus Rath <Nikolaus@rath.org> | 2017-05-25 12:48:27 -0700 |
| commit | 8641db4af724682fb1c922cbecf6c7e1dfe1a71c (patch) | |
| tree | 9cd0a67a03c112a9b003cec8ebb02c8dd3af876e /example | |
| parent | 179fa13b40387645e722089873079488f9dbe3d8 (diff) | |
passthrough_ll: document that fuse_ino_t and uintptr_t sizes must match
We can consider changing the code to drop the requirement if it
turns out that there's a system where this isn't given.
Fixes issue #167.
Diffstat (limited to 'example')
| -rw-r--r-- | example/passthrough_ll.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/example/passthrough_ll.c b/example/passthrough_ll.c index ac566ad..772a822 100644 --- a/example/passthrough_ll.c +++ b/example/passthrough_ll.c @@ -47,6 +47,19 @@ #include <errno.h> #include <err.h> +/* We are re-using pointers to our `struct lo_inode` and `struct + lo_dirp` elements as inodes. This means that we require uintptr_t + and fuse_ino_t to have the same size. The following incantation + defines a compile time assert for this requirement. */ +#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 6) && !defined __cplusplus +_Static_assert(sizeof(fuse_ino_t) == sizeof(uintptr_t), "fuse: off_t must be 64bit"); +#else +struct _uintptr_to_must_hold_fuse_ino_t_dummy_struct \ + { unsigned _uintptr_to_must_hold_fuse_ino_t: + ((sizeof(fuse_ino_t) == sizeof(uintptr_t)) ? 1 : -1); }; +#endif + + /* Compat stuff. Doesn't make it work, just makes it compile. */ #ifndef HAVE_FSTATAT #warning fstatat(2) needed by this program |