Linux procfs question!

I want to implement ps command using only the files of Linux procfs, how can I do it?

I want to print it out similar to psaux on Linux, but I look forward to hearing from mastersㅜ<


root@raspberrypi:/proc# ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.1  0.4   5420  3964 ?        Ss   14:16   0:04 /sbin/init
root         2  0.0  0.0      0     0 ?        S    14:16   0:00 [kthreadd]
root         3  0.0  0.0      0     0 ?        S    14:16   0:00 [ksoftirqd/0]
root         5  0.0  0.0      0     0 ?        S<   14:16   0:00 [kworker/0:0H]
root         7  0.0  0.0      0     0 ?        S    14:16   0:00 [rcu_sched]
root         8  0.0  0.0      0     0 ?        S    14:16   0:00 [rcu_bh]
root         9  0.0  0.0      0     0 ?        S    14:16   0:00 [migration/0]
root        10  0.0  0.0      0     0 ?        S    14:16   0:00 [migration/1]
root        11  0.0  0.0      0     0 ?        S    14:16   0:00 [ksoftirqd/1]
root        13  0.0  0.0      0     0 ?        S<   14:16   0:00 [kworker/1:0H]
root        14  0.0  0.0      0     0 ?        S    14:16   0:00 [migration/2]
root        15  0.0  0.0      0     0 ?        S    14:16   0:00 [ksoftirqd/2]
root        17  0.0  0.0      0     0 ?        S<   14:16   0:00 [kworker/2:0H]
root        18  0.0  0.0      0     0 ?        S    14:16   0:00 [migration/3]
root        19  0.0  0.0      0     0 ?        S    14:16   0:00 [ksoftirqd/3]
root        21  0.0  0.0      0     0 ?        S<   14:16   0:00 [kworker/3:0H]
root        22  0.0  0.0      0     0 ?        S<   14:16   0:00 [khelper]
root        23  0.0  0.0      0     0 ?        S    14:16   0:00 [kdevtmpfs]
root        24  0.0  0.0      0     0 ?        S<   14:16   0:00 [netns]
root        25  0.0  0.0      0     0 ?        S<   14:16   0:00 [perf]

linux

2022-09-22 22:05

1 Answers

(Amendment) To obtain from /proc, understand the path pattern "/proc/[number]/[partial path]"procman page documentation first.

Partial path

status file

stat file: process information

3193 (VBoxHeadless) S 3135 3193 3134 0 -1 4202496 360568 0 406 0 3041427 6421688 0 0 20 0 25 0 3228 2759557120 302185 18446744073709551615 4194304 4218588 140736234964176 140736234950688 139806890640307 0 8192 4096 73728 18446744073709551615 0 0 17 12 0 0 8 0 0

statm file : This file is memory usage information.

905095 532797 529991 6 0 312198 0

2022-09-22 22:05

If you have any answers or tips

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