[jayhemnani9910]

pgrep --older N (and pkill/pidwait, which share the matcher) should select processes that have been running for at least N seconds. It compared N with the process's start time, which /proc//stat gives in clock ticks since boot, so on any machine up for more than N/100 seconds every process matched:

$ sleep 100 & sleep 2.5
$ pgrep --older 5 -x sleep      # procps-ng 4.0.4: nothing; main: lists the 2.5 s old sleep

The matcher now reads the time since boot (/proc/uptime) and the clock tick rate (sysconf(_SC_CLK_TCK)) once, and keeps a process when now - start_time >= N * ticks. Without --older nothing changes.

Against procps-ng 4.0.4 with a 2.5 s old process: --older 0/1/2 match, --older 3/5/99999999 don't, on both. --older 60 -x systemd gives the same processes. A huge N saturates instead of overflowing.

Test test_older_compares_process_age: a just-spawned sleep is listed with --older 0 and not with --older 60 (fails on main). cargo test: 225 pass (224 on main), cargo clippy --all-targets -- -D warnings clean.

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[codecov]

Codecov Report

❌ Patch coverage is 37.50000% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.45%. Comparing base (67832aa) to head (f223b37).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/pgrep/src/process_matcher.rs	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #821      +/-   ##
==========================================
+ Coverage   19.20%   19.45%   +0.24%     
==========================================
  Files          68       68              
  Lines       10156    10257     +101     
  Branches      546      552       +6     
==========================================
+ Hits         1950     1995      +45     
- Misses       8206     8262      +56     

Flag	Coverage Δ
macos_latest	6.75% <0.00%> (+<0.01%)	⬆️
ubuntu_latest	19.81% <38.70%> (+0.25%)	⬆️
windows_latest	0.02% <0.00%> (ø)

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