Process identifier
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Identifiant de processus
L'identifiant de processus ou PID (Process IDentifier) est un code unique attribué sur les systèmes Unix ou Windows à tout processus lors de son démarrage. Il permet ainsi d'identifier le processus dans la plupart des commandes s'appliquant sur un processus donné (comme kill).
Sous Linux le premier programme démarré, init, a le PID 1. Les processus suivants incrémentent le numéro pour arriver à 32768 par défaut (réglable avec /proc/sys/kernel/pid_max) pour repartir de 2 en évitant les PID déjà utilisés.
L'identifiant de processus parent ou PPID ou (Parent Process IDentifier) d'un processus est, dans les systèmes UNIX, le PID du processus ayant initié sa création (via l'appel système fork).
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