Linux signals（一）理论、C语言捕获信号并处理

最新推荐文章于 2025-05-29 11:30:00 发布

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最新推荐文章于 2025-05-29 11:30:00 发布 · 6.3k 阅读

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#linux #signals

首先需要知道signals和interrupt是不同的。
signal属于进程通信机制的一种实现方式
（还有的实现为：Pipes、Sockets
其中Sockets又可分为： System V IPC Mechanisms、Message Queues、Semaphores、Shared Memory）
关于进程间通信，具体参见：Chapter 5
Interprocess Communication Mechanisms

而具体的不同，别人的回答是：

Interrupts can be viewed as a mean of communication between the CPU and the OS kernel. Signals can be viewed as a mean of communication between the OS kernel and OS processes.

Interrupts may be initiated by the CPU (exceptions -e.g.: divide by zero, page fault), devices (hardware interrupts -e.g.: input available), or by a CPU instruction. They are eventually managed by the CPU, which “interrupts” the current task,and invokes an 0S-kernel provided ISR/interrupt handler

Signals may be initiated by the OS kernel（下面的实例也揭示了这一点）, or by a process( kill() ). They are eventually managed by the OS kernel, which delivers them