[Bug 1839329] Re: pgrep: Use POSIX _SC_ARG_MAX for maximum pgrep -f command line length

[Eric Desrochers]

The '-a' flag[0] which should lis the full cmd line seems to be in
limited to 4096 chars[1] which in most case is more than enough, but not
the case for java processes with long classpaths for instance as
describe in the bug description.


[0]       -a, --list-full
              List the full command line as well as the process ID.  (pgrep only.)

[1] pgrep.c
     44 
     45 #define CMDSTRSIZE 4096
     46

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Title:
  pgrep: Use POSIX _SC_ARG_MAX for maximum pgrep -f command line length

Status in procps package in Ubuntu:
  In Progress
Status in procps source package in Xenial:
  New
Status in procps source package in Bionic:
  New
Status in procps source package in Disco:
  New

Bug description:
  [Impact]
  The pgrep -f and pkill -f commands are unable to find processes strings in processes which are beyond the 4096th character. This often happens with Java command lines with long classpaths on the command line.

  [Test Case]
  A quick test to reproduce this is to vi a file using a filename over 4k (e.g. vi $(seq 1 1250| paste -s -d'_')_foo.txt) and leave vi running; then try running pgrep -af 'foo.txt' to find it.

  [Potential Regression[

  [Other Infos]
  This bug is a mirror of what has already been reported in GitLab, through the merge request #85 [1], and has been previously reported at the merge request #80 [2], with no response/reply.

  Let me know if further information is needed, at this point, to
  proceed.  Thanks!

  [1] https://gitlab.com/procps-ng/procps/merge_requests/85
  [2] https://gitlab.com/procps-ng/procps/merge_requests/80

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