I have been happily using scanadf with the -S script --script-wait parameters for a couple of years.
My script converts the image data to pdf, via a call to pnmtops, piped through ps2pdf. However recently (I suspect since I updated from Fedora 17 to 19), the called script hangs, and therefore scanadf hangs. The script is hung at the pnmtops command. The pnmtops command itself is waiting for its forked "child" pnmtops output filter to complete, and it never does. Running the scan_perpage script directly works fine. Running the pnmtops command directly works fine. It is only when run from scanadf via -S that the script hangs at pnmtops. Versions: # rpm -q --info sane-backends Name : sane-backends Version : 1.0.23 Release : 13.fc19 # rpm -q --info sane-frontends Name : sane-frontends Version : 1.0.14 Release : 16.fc19 # rpm -q --info netpbm Name : netpbm Version : 10.61.02 Release : 5.fc19 Here is the output of my scan script, which calls scanadf -vv: $ scan -o output.pdf Scanning... scanadf: value for --resolution is: 300 scanadf: scanning image of size 2544x3300 pixels at 1 bits/pixel scanadf: acquiring gray frame Started script `/usr/local/bin/scan_perpage' as pid=10902 Scanned document scan-0001 pnmtops: Input maxval is 1. Postscript raster will have 1 bits per sample, so maxval = 1 pnmtops: Image will be 610.56 points wide by 792.00 points high, left edge 0.72 points from left edge of page, bottom edge 0.00 points from bottom of page; NOT turned to landscape orientation pnmtops: output filter spawned: pid 10904 pnmtops: Waiting for PID 10904 to exit Scanned 1 pages <hang> Here is the process tree at the point of the hang: 10897 32072 /bin/sh /usr/local/bin/scan -o output.pdf 10898 10897 scanadf -vvv -d fujitsu -S /usr/local/bin/scan_perpage --script-wait --resolution 300 --mode Lineart -o scan-%04d 10902 10898 /bin/bash /usr/local/bin/scan_perpage scan-0001 10903 10902 pnmtops -verbose -imagewidth 8.5 -imageheight 11 scan-0001 10904 10903 pnmtops -verbose -imagewidth 8.5 -imageheight 11 scan-0001 Process 10904 (the forked pnmtops "output filter") never finishes. An strace indicates it is waiting on a "read". I can't figure out why pnmtops hangs when called via scanadf, but when called directly it works perfectly fine. Any ideas? Regards, Raman
