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ntp 4.2.6p5

    1: /*
    2:  * Defines for the "clk" timestamping STREAMS module
    3:  */
    4: 
    5: #if defined(sun)
    6: #include <sys/ioccom.h>
    7: #else
    8: #include <sys/ioctl.h>
    9: #endif
   10: 
   11: /*
   12:  * First, we need to define the maximum size of the set of
   13:  * characters to timestamp. 32 is MORE than enough.
   14:  */
   15: 
   16: #define CLK_MAXSTRSIZE 32
   17: struct clk_tstamp_charset {		/* XXX to use _IOW not _IOWN */
   18: 	char	val[CLK_MAXSTRSIZE];
   19: };
   20: 
   21: /*
   22:  * ioctl(fd, CLK_SETSTR, (char*)c );
   23:  *
   24:  * will tell the driver that any char in the null-terminated
   25:  * string c should be timestamped. It is possible, though
   26:  * unlikely that this ioctl number could collide with an
   27:  * existing one on your system. If so, change the 'K'
   28:  * to some other letter. However, once you've compiled
   29:  * the kernel with this include file, you should NOT
   30:  * change this file.
   31:  */
   32: 
   33: #if defined(__STDC__)			/* XXX avoid __STDC__=0 on SOLARIS */
   34: #define CLK_SETSTR _IOW('K', 01, struct clk_tstamp_charset)
   35: #else
   36: #define CLK_SETSTR _IOW(K, 01, struct clk_tstamp_charset)
   37: #endif
   38: