使用EXEC（）给予和放大器，我们可以启动一个后台进程;作为参数？ [英] Can we start a background process using exec() giving & as an argument?

问题描述

如果没有，我们怎么能启动一个后台进程用C？

If not, how can we start a background process in C?

推荐答案

在Unix中，执行exec（）只是故事的一部分。

In Unix, exec() is only part of the story.

的exec（）用于启动当前进程中的一个新的二进制。这意味着，当前在当前进程运行二进制将不再运行。

exec() is used to start a new binary within the current process. That means that the binary that is currently running in the current process will no longer be running.

所以，你调用exec（）之前，你要调用fork（）来创建一个新的过程，以便您当前的二进制可以继续运行。

So, before you call exec(), you want to call fork() to create a new process so your current binary can continue running.

通常情况下，能有当前的二进制等待新的进程退出，你调用wait *（）家族的一员。这个函数将会把当前的进程睡眠直到你等待的过程就完成了。

Normally, to have the current binary wait for the new process to exit, you call one of the wait*() family. That function will put the current process to sleep until the process you are waiting is done.

因此​​，为了创造一个背景的过程，当前的进程应该只跳过呼叫等待。

So in order to create a "background" process, your current process should just skip the call to wait.

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