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运行tail|grep后按下Ctrl-C的过程中发生了什么
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运行tail|grep后按下Ctrl-C的过程中发生了什么 - 暗无天日
运行tail|grep后按下Ctrl-C的过程中发生了什么
从 https://ubuntuforums.org/showthread.php?t=1761120&s=bbaf101ffbcc9abdb032d90cff01fc36 中看到的，记录一下
在shell中运行 tail|grep 时发生了什么
运行tail
- shell调用fork产生子进程
- 重置信号处理函数为SIG_DFL
- 产生新的进程组，并将子进程设置为该进程组的leader
- exec tail
运行grep
- shell调用fork产生子进程
- 重置信号处理函数为SIG_DFL
- 将进程加入到
tail产生的进程组中 - exec tail
将新产生的进程组放到前台，控制终端
- tcsetpgrp(STDIN_FILENO, tail进程组);
当按下Ctrl-c时发生了什么
根据 setpgrp manual page 的说法，按下 Ctrl-c 后:
- 终端产生
SIGINT信号 - 前台进程组中的所有进程都会接收到
SIGINT信号然后退出(默认动作) - shell通过调用
waitpid清理进程表中子进程信息
2018-08-16
2018-08-16
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