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Openai/6911cc4b-5d54-800b-88ae-dc7ac6ff2d3d
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=== User: fork 函数的返回值有三种情况：0 表示当前代码正在子进程中执行。非零正整数 返回的是新创建的子进程的进程标识符 PID。-1 表示进程创建失败。 === fork() 函数的返回值有三种情况：0 表示当前代码正在子进程中执行。非零正整数 返回的是新创建的子进程的进程标识符 (PID)。-1 表示进程创建失败。
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