How the fork() System Call Actually Works in Linux

2026-10-28来源 dev.toEnglish

The fork() System Call 

pid_t pid = fork(); if (pid == 0) { printf("I am the child!\n"); } else { printf("I am the parent of %d!\n", pid); }

⚡ Copy-on-Write (COW)

Rather than copying gigabytes of RAM during fork(), the kernel marks all page table entries as read-only. A page is physically cloned only when one process attempts to write to it.

Explore the full interactive process lifecycle on Binary Dose.

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