/usr/include/ntirpc/misc/opr.h is in libntirpc-dev 1.4.4-1.
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 | #ifndef OPR_H
#define OPR_H 1
#define opr_containerof(ptr, structure, member) \
((structure *)((char *)(ptr)-(char *)(&((structure *)NULL)->member)))
#endif /* OPR_H */
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