devicemapper-sys 0.3.3

Low level bindings for devicemapper
Documentation 
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#include <sys/sem.h>

union semun {
    int   val;               /* Value for SETVAL */
    struct semid_ds *buf;    /* Buffer for IPC_STAT, IPC_SET */
    unsigned short  *array;  /* Array for GETALL, SETALL */
    struct seminfo  *__buf;  /* Buffer for IPC_INFO
                                (Linux-specific) */
};