ftruncate(2) for System V.3.2 needed

[Pat Myrto]

In article <02KJ02SJ3cms01 at amdahl.uts.amdahl.com>, kucharsk at uts.amdahl.com (William Kucharski) writes:
< 
<  ... [ Most of posted source deleted ] ...
<                 /*
<                  * This relies on the UNDOCUMENTED F_FREESP argument to
<                  * fcntl(2), which truncates the file so that it ends at the
<                  * position indicated by fl.l_start.
<                  *
<                  * Will minor miracles never cease?
<                  */
< 
< 		if (fcntl(fd, F_FREESP, &fl) < 0)
< 			return(-1);

This ioctl() call looks like something that would be interesting to
try, however, the value of F_FREESP is not to be found in *ANY* of the
includes on my site - could someome perhaps indicate what numerical
value F_FREESP is supposed to be on USG type systems?
Thanks...

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