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Hi,

I'm using IRAF 2.16 on OS X Yosemite, and I've got an issue when I try to overwrite on fits already existing. (ERROR: Cannot open file (/tmp///.IMT504)). I've checked on the forum and haven't found any solution yet (which was working).

My problem occurs when I use "imarith" or "doslit" task and don't specify an output (or if output = input).
I'm currently trying to complete the doslit tutorial (I'm kind of new to IRAF), so apparently everything should work quite smoothly, I guess. Here is my complete error message :

Change wavelength coordinate assignments? (yes|no|NO): no
ERROR: Cannot open file (/tmp///.IMT504)
"logfile=logfile)"
line 97: doslit$sarcrefs.cl (hidden task)
called as: `sarcrefs (arcref1=fdemoarc1, crval=INDEF, cdelt=INDEF, done=tmp$iraf1574ba, log1=logfile, log2=STDOUT)'
"sarcrefs (arcref1, crval, cdelt, done, log1, log2)"
line 189: doslit$sproc.cl (hidden task)
called as: `sproc (objects=tmp$iraf1574w, arcs1=tmp$iraf1574x, arctable=, standards=tmp$iraf1574y, crval=INDEF, cdelt=INDEF, dispcor=yes, extcor=yes, fluxcal=yes, resize=yes, clean=yes, splot=yes, redo=no, update=no, quicklook=no, batch=no, listonly=no)'
"resize, clean, splot, redo, update, quicklook, batch, listonly)"
line 54: doslit$doslit.cl
called as: `doslit ()'

I already have checked access permissions to /tmp and files in it, and " cl\$this->_split2($m[0]) show tmp " gives me "/tmp/".

If anyone has any clue about it, feel free to share ! Thanks in advance for any enlightenment.

Cheers,
Jean-Gabriel

This was reported once or twice before but never actually resolved. It is almost certain that the error about the /tmp/.IMTnnn file is bogus, i.e. it's not something a task like IMARITH/DOSLIT would open (it is the unix socket for image display) but in the various layers of the IRAF kernel it is possible this error message percolated up from some lower-level system call

A task like IMARITH has the prospect of overwriting the input image by writing a temp image of the result and then moving it image back to the input file so an error in writing to /tmp (is the partition full? are there other temp files) may be the real problem and the error message is just getting unwrapped incorrectly. You can explicitly remove the /tmp/.IMT* files to see whether a more informative error appears.

Thank you for your answer !

The solution to my problem seemed to be hidden here : https://iraf.net/forum/viewtopic.php?showtopic=1468688

I added this line "export IMTDEV=inet:5137" to my .bashrc and my error message vanished. I don't know if it is linked, or if I rebooted enough my computer to make it work

Thank you again for your help !

Jean-Gab