{"id":4031,"date":"2025-09-10T10:19:30","date_gmt":"2025-09-10T09:19:30","guid":{"rendered":"https:\/\/workboot.fr\/ciela\/?page_id=4031"},"modified":"2025-09-11T14:02:28","modified_gmt":"2025-09-11T13:02:28","slug":"kernel-et-processus","status":"publish","type":"page","link":"https:\/\/workboot.fr\/ciela\/kernel-et-processus\/","title":{"rendered":"kernel et processus"},"content":{"rendered":"\n

Le r\u00e9pertoire \/proc <\/p>\n\n\n\n

Sous Linux (UNIX) tout est fichier <\/p>\n\n\n\n

Cela veut dire que tout est dans l’arborescence depuis la racine ! c’est la base de l’informatique<\/p>\n\n\n\n

La variable $$<\/h2>\n\n\n\n

depuis un terminal on va obtenir le PID de se terminal , Process IDentifiant ! car le terminal lui m\u00eame est un processus<\/p>\n\n\n\n

bruno@elliott:~$ echo $$\n9045\nbruno@elliott:~$ ps\n    PID TTY          TIME CMD\n   9045 pts\/2    00:00:00 bash\n   9056 pts\/2    00:00:00 ps\nbruno@elliott:~$ <\/code><\/pre>\n\n\n\n
$$<\/strong> est une variable d’environnement qui nous donne le PID <\/strong>du processus en cours ici  9045 <\/p>\n\n\n\n
au passage avec ps (la fonction qui liste les processus , sans option c’est \u00e0 partir de la ou nous sommes)<\/p>\n\n\n\n
on notera que ps est aussi un processus lanc\u00e9 et oui il se voit lui m\u00eame 9056<\/p>\n\n\n\n
bruno@elliott:~$ ps\n    PID TTY          TIME CMD\n   9045 pts\/2    00:00:00 bash\n   9169 pts\/2    00:00:00 ps<\/code><\/pre>\n\n\n\n
et normalement le kernel lui attribut un PID diff\u00e8rent .<\/p>\n\n\n\n
Et ce qui est remarquable c’est qu’il existe que le temps qu’on l\u2019utilise <\/p>\n\n\n\n
Le r\u00e9pertoire \/proc<\/h2>\n\n\n\n
Dans ce r\u00e9pertoire on y trouve tous les processus lanc\u00e9s et plus<\/p>\n\n\n\n
le 1 !! est le init ou systemd  , c’est le premier processus sur lequel tout s’appuie sur votre machine!<\/p>\n\n\n\n
bruno@elliott:~$ cat \/proc\/1\/cmdline \n\/sbin\/init<\/strong>bruno@elliott:~$ <\/code><\/pre>\n\n\n\n
ici nous c’est init!<\/p>\n\n\n\n
bruno@elliott:~$ ls \/proc\/1\/cmdline -l\n-r--r--r-- 1 root root 0 10 sept. 09:04 \/proc\/1\/cmdline\nbruno@elliott:~$ <\/code><\/pre>\n\n\n\n
on note ici que ce fichier n’est qu’en lecture , m\u00eame pour ROOT !!<\/p>\n\n\n\n
Ce sont des pseudos fichiers<\/strong>, ou des fichiers virtuels<\/strong>, qui n’existe  que dans le kernel (et non pas sur le disque)<\/p>\n\n\n\n
bruno@elliott:~$ cat \/proc\/9045\/cmdline \nbash<\/strong>bruno@elliott:~$ <\/code><\/pre>\n\n\n\n
ce deuxi\u00e8me exemple permet de voir notre bash …  a vous d’adapter a votre PID<\/p>\n\n\n\n
cat \/proc\/$$\/status<\/summary>\n
bruno@elliott:~$ cat \/proc\/$$\/status
Name: bash
Umask: 0022
State: S (sleeping)
Tgid: 9045
Ngid: 0
Pid: 9045
PPid: 8487
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
FDSize: 256
Groups: 4 20 24 25 27 29 30 33 44 46 100 101 104 106 112 114 117 126 1000
NStgid: 9045
NSpid: 9045
NSpgid: 9045
NSsid: 9045
VmPeak: 9996 kB
VmSize: 9836 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 6276 kB
VmRSS: 6272 kB
RssAnon: 1932 kB
RssFile: 4340 kB
RssShmem: 0 kB
VmData: 1948 kB
VmStk: 132 kB
VmExe: 772 kB
VmLib: 2288 kB
VmPTE: 56 kB
VmSwap: 0 kB
HugetlbPages: 0 kB
CoreDumping: 0
THP_enabled: 1
Threads: 1
SigQ: 0\/63357
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000010000
SigIgn: 0000000000384004
SigCgt: 000000004b813efb
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: 000001ffffffffff
CapAmb: 0000000000000000
NoNewPrivs: 0
Seccomp: 0
Seccomp_filters: 0
Speculation_Store_Bypass: thread vulnerable
SpeculationIndirectBranch: conditional enabled
Cpus_allowed: f
Cpus_allowed_list: 0-3
Mems_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 494
nonvoluntary_ctxt_switches: 41
bruno@elliott:~$<\/p>\n<\/details>\n\n\n\n
<\/p>\n\n\n\n
Beaucoup trop d’infos !!et \u00e7a tue l’info , non ? \ud83d\ude42<\/p>\n\n\n\n
bruno@elliott:~$ cat \/proc\/$$\/status | grep State\nState:\tS (sleeping)<\/strong>\nbruno@elliott:~$ <\/code><\/pre>\n\n\n\n
avec pipe (|) et grep on filtre que State <\/p>\n\n\n\n
et on remarque que mon processus bash dors ! il attends une action ..<\/p>\n\n\n\n
pour illustrer<\/h2>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
xcloxk    est un petit utilitaire qui nous lance une pendule (fen\u00eatre graphique)<\/p>\n\n\n\n
on voit son PID qui est 10429<\/p>\n\n\n\n
bruno@elliott:~$ kill -STOP 10429\n\n[1]+  Stopp\u00e9                 xclock\nbruno@elliott:~$ cat \/proc\/10429\/status | grep State\nState:\tT (stopped)\nbruno@elliott:~$ \n<\/code><\/pre>\n\n\n\n
on peut relancer avec<\/p>\n\n\n\n
kill -CONT 10429<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
Le r\u00e9pertoire \/proc Sous Linux (UNIX) tout est fichier Cela veut dire que tout est dans l’arborescence depuis la racine ! c’est la base de l’informatique La variable $$ depuis […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-4031","page","type-page","status-publish","hentry"],"yoast_head":"\nkernel et processus - workboot<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/workboot.fr\/ciela\/kernel-et-processus\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"kernel et processus - workboot\" \/>\n<meta property=\"og:description\" content=\"Le r\u00e9pertoire \/proc Sous Linux (UNIX) tout est fichier Cela veut dire que tout est dans l’arborescence depuis la racine ! 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