[systemd-bugs] [Bug 56644] systemd-cgls shows 'n/a' for when piping output less or more

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56644

--- Comment #3 from Anders Olofsson <Anders.Olofsson at axis.com> ---
Created attachment 69696
  --> https://bugs.freedesktop.org/attachment.cgi?id=69696&action=edit
Patch to handle failed columns detection.

This looks like the same problem I'm having. I have attached a patch that
solves it for me.

The problem is that terminal width detection fails (fd_columns() in
src/shared/util.c) but the calling function (columns() in src/shared/util.c)
doesn't handle signed values and returns 4294967273 as the number of columns.
When the fault column number is passed along to get_process_cmdline() (in
src/shared/util.c) it fails to allocate memory for a string that wide resulting
in a null pointer that is printed as "n/a".

Fault exists in version 195 but not in 194.

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