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（请来拿分） 内核态驱动的中断里怎么发信号给用户程序？
来源: 互联网 发布时间：2016-03-22
本文导语: 我的一个网卡驱动，我发现在它的接收中断里不能发信号给用户程序，否则会出现错误，死机，非中断的地方可以发的。我用的函数是send_sig(sig,*task struct,priv)，这个函数的第三个参数priv有什么作用？ 谢谢！ ...
我的一个网卡驱动，我发现在它的接收中断里不能发信号给用户程序，否则会出现错误，死机，非中断的地方可以发的。我用的函数是send_sig(sig,*task struct,priv)，这个函数的第三个参数priv有什么作用？ 谢谢！
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节自 3rd.
11.2.1. The specific_send_sig_info( ) Function
The specific_send_sig_info( ) function sends a signal to a specific process. It acts on three parameters:
sig
The signal number.
info
Either the address of a siginfo_t table or one of three special values: 0 means that the signal has been sent by a User Mode process, 1 means that it has been sent by the kernel, and 2 means that is has been sent by the kernel and the signal is SIGSTOP or SIGKILL.
t
A pointer to the descriptor of the destination process.
11.2.1. The specific_send_sig_info( ) Function
The specific_send_sig_info( ) function sends a signal to a specific process. It acts on three parameters:
sig
The signal number.
info
Either the address of a siginfo_t table or one of three special values: 0 means that the signal has been sent by a User Mode process, 1 means that it has been sent by the kernel, and 2 means that is has been sent by the kernel and the signal is SIGSTOP or SIGKILL.
t
A pointer to the descriptor of the destination process.
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针对第一个问题。可能是信号级别问题？
至于第二个问题，我找到一个回答，你看看先。
kernel to user space signalling
You should find the task structure using find_task_by_pid(pid) and then deliver the signal.
You also have to take care of some locks(mostly siglock).
至于第二个问题，我找到一个回答，你看看先。
kernel to user space signalling
You should find the task structure using find_task_by_pid(pid) and then deliver the signal.
You also have to take care of some locks(mostly siglock).
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