/usr/include/dovecot/file-set-size.h is in dovecot-dev 1:2.2.22-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #ifndef FILE_SET_SIZE_H
#define FILE_SET_SIZE_H
/* Shrink/grow file. If file is grown, the new data is guaranteed to
be zeros. The file offset may be anywhere after this call.
Returns -1 if failed, 0 if successful. */
int file_set_size(int fd, off_t size);
/* Preallocate file to given size, without actually changing the size
reported by stat(). Returns 1 if ok, 0 if not supported by this filesystem,
-1 if error. */
int file_preallocate(int fd, off_t size);
#endif
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