1  /* Define several variants of struct epoll_event from the Linux kernel,
       2     specifying various attributes that affect alignment and size.
       3   
       4     This test was developed for systems for which int is 32 bits and
       5     long long is 64 bits; it might need to be disabled for systems where
       6     either of those is not true.  */
       7  
       8  #define DESC_orig "original"
       9  struct epoll_event_orig {
      10    unsigned int events;
      11    unsigned long long data;
      12  };
      13  
      14  #ifndef SKIP_ATTRIBUTE
      15  #define DESC_structmax "maximum useful struct alignment"
      16  struct epoll_event_structmax {
      17    unsigned int events;
      18    unsigned long long data;
      19  } __attribute__ ((aligned));
      20  
      21  
      22  #define DESC_struct4 "4-byte struct alignment"
      23  struct epoll_event_struct4 {
      24    unsigned int events;
      25    unsigned long long data;
      26  } __attribute__ ((aligned(4)));
      27  
      28  #define DESC_struct8 "8-byte struct alignment"
      29  struct epoll_event_struct8 {
      30    unsigned int events;
      31    unsigned long long data;
      32  } __attribute__ ((aligned(8)));
      33  
      34  #define DESC_data4 "4-byte alignment for data"
      35  struct epoll_event_data4 {
      36    unsigned int events;
      37    unsigned long long data __attribute__ ((aligned(4)));
      38  };
      39  
      40  #define DESC_data8 "8-byte alignment for data"
      41  struct epoll_event_data8 {
      42    unsigned int events;
      43    unsigned long long data __attribute__ ((aligned(8)));
      44  };
      45  
      46  #define DESC_p "packed attribute"
      47  struct epoll_event_p {
      48    unsigned int events;
      49    unsigned long long data;
      50  } __attribute__ ((packed));
      51  
      52  #define DESC_pstruct4 "packed attribute, 4-byte struct alignment"
      53  struct epoll_event_pstruct4 {
      54    unsigned int events;
      55    unsigned long long data;
      56  } __attribute__ ((packed)) __attribute__ ((aligned(4)));
      57  
      58  #define DESC_pstruct8 "packed attribute, 8-byte struct alignment"
      59  struct epoll_event_pstruct8 {
      60    unsigned int events;
      61    unsigned long long data;
      62  } __attribute__ ((packed)) __attribute__ ((aligned(8)));
      63  
      64  #define DESC_pdata4 "packed attribute, 4-byte alignment for data"
      65  struct epoll_event_pdata4 {
      66    unsigned int events;
      67    unsigned long long data __attribute__ ((aligned(4)));
      68  } __attribute__ ((packed));
      69  
      70  #define DESC_pdata8 "packed attribute, 8-byte alignment for data"
      71  struct epoll_event_pdata8 {
      72    unsigned int events;
      73    unsigned long long data __attribute__ ((aligned(8)));
      74  } __attribute__ ((packed));
      75  #endif