我该如何通过将取消SIGINT忽略的包装程序启动后台进程？

问题描述

我想从 bash 启动后台进程，以便随后可以向其发送SIGINT信号（例如：通过 kill 或 htop ）。我该怎么做？

I want to launch a background process from bash in such a way that I can then send SIGINT signals to it (eg: via kill or htop). How do I do that?

默认情况下，在后台启动进程时， SIGINT 和 SIGQUIT 被忽略（请参阅）。

By default, when a process is launched in the backround, SIGINT and SIGQUIT are ignored (see this question).

推荐答案

如果执行了该过程（不仅是子shell，而是基于二进制文件），则可以通过包装程序运行该程序，该包装程序将撤消SIGINT / SIGQUIT忽略：

If the process is execed (=isn't just a subshell but is based on binary), you can run it through a wrapper that'll undo the SIGINT/SIGQUIT ignore:

reset_sigint.c：

reset_sigint.c:

#include <signal.h>
#include <unistd.h>
int main(int C, char**V)
{
    sigaction(SIGINT,&(struct sigaction){.sa_handler=SIG_DFL}, 0);
    execvp(V[1],V+1);
    return 127;
}

为防止SIGINT / SIGQUIT，更一般地忽略作为命令运行的任何进程在外壳中，您可以使用 set -m 在

To prevent the SIGINT/SIGQUIT ignore more generically for any process run as a command in the shell, you can run it with set -m on

sh -c 'set -m; ( sleep 10 )& ps -p $! -o ignored'
#compare with: sh -c '( sleep 10 )& ps -p $! -o ignored'

，但这会在一个单独的进程组中将命令作为（可能是不希望的）副作用。

but that'll run the command in a separate process group as a (possibly undesirable) sideffect.

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