1IM_IOCHECK(3)              Library Functions Manual              IM_IOCHECK(3)
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NAME

6       im_pincheck,  im_poutcheck,  im_piocheck - checks image descriptors for
7       PIO
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SYNOPSIS

10       #include <vips/vips.h>
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12       int im_pincheck( in )
13       IMAGE *in;
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15       int im_poutcheck( out )
16       IMAGE *out;
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18       int im_piocheck( in, out)
19       IMAGE *in, *out;
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DESCRIPTION

22       im_pincheck(3) checks that an image  descriptor  is  suitable  for  PIO
23       input.  If  the  descriptor  is  IM_OPENOUT and the descriptor has been
24       written to, it is automatically `rewound,' that is, it  is  closed  and
25       reopened as an IM_MMAPIN descriptor.
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27       im_poutcheck(3) checks that a descriptor is suitable for PIO output.
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29       im_piocheck(3)   simply   calls   in_pincheck(3)   for   image  in  and
30       im_poutcheck(3) for image out.
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RETURN VALUE

33       All functions returns 0 on success and -1 on error.
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SEE ALSO

36       im_generate(3),  im_open(3).  `VIPS  Library  Programmers'  Guide,'  in
37       accompanying documentation.
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40       National Gallery
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AUTHOR

43       J. Cupitt - 23/7/93
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47                                 11 April 1990                   IM_IOCHECK(3)
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