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OS/pintos-env/pintos/lib/packed.h

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#ifndef __LIB_PACKED_H
#define __LIB_PACKED_H
/* The "packed" attribute, when applied to a structure, prevents
GCC from inserting padding bytes between or after structure
members. It must be specified at the time of the structure's
definition, normally just after the closing brace. */
#define PACKED __attribute__ ((packed))
#endif /* lib/packed.h */