Messages in this thread | | | Subject | Re: Is there a "make hole" (truncate in middle) syscall? | From | Philippe Troin <> | Date | 04 Dec 2003 17:04:48 -0800 |
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Peter Chubb <peter@chubb.wattle.id.au> writes:
> >>>>> "Rob" == Rob Landley <rob@landley.net> writes: > > Rob> You can make a file with a hole by seeking past it and never > Rob> writing to that bit, but is there any way to punch a hole in a > Rob> file after the fact? (I mean other with lseek and write. Having > Rob> a sparse file as the result....) > > SVr4 has fcntl(fd, F_FREESP, flock) that frees the space covered by > the struct flock in the file. Linux doesn't have this, at least in > the baseline kernels.
However most SVr4 (at least Solaris and HP-UX) only implement FREESP when the freed space is at the file's tail. In other words, FREESP can only be used to implement ftruncate().
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