[cups-devel] [MOD] STR #4726: If filter or backend errors, in the error_log entry exit status and error message do not correspond

[Till Kamppeter]

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[STR New]

I am testing the printing on an ARM system and CUPS does not succeed to
start the /usr/lib/cups/backend/ipps executable, erroring out with status
127 which is by the standards "Command not found" (does not only occur wen
the referenced executable file does not exist but also when its interpreter
according to the shebang or a library needed by it is missing). The
error_log gives an entry like this:

D [06/Oct/2015:08:51:08 -0300] [Job 5] PID 3979
(/usr/lib/cups/backend/ipps) stopped with status 127 (File too large)

with the text description of the error being "File too large". I was
wondering a lot that it even appeared with a 1-byte-long job.

Looking into the source code reveals that this text does not correspond
with the exit status:

File scheduler/main.c, function process_children():

[...]
        if (code > 100)
          cupsdLogJob(job, CUPSD_LOG_DEBUG,
                      "PID %d (%s) stopped with status %d (%s)", pid, name,
                      code, strerror(code - 100));
[...]

The numeric code is straightly shown: code -> status %d
But the text is of code - 100: strerror(code - 100) -> (%s)

So the text is of exit status 27 here.

Link: https://www.cups.org/str.php?L4726
Version: 2.0.2
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