Struct axsignal::action::SigAction

#[repr(C)]
pub struct SigAction {
    pub sa_handler: usize,
    pub sa_flags: SigActionFlags,
    pub restorer: usize,
    pub sa_mask: usize,
}

The structure of the signal action

Fields

sa_handler: usize

信号处理函数的地址

1. 如果是上述特殊值 SIG_DFL 或 SIG_IGN，则按描述处理
2. 若flags没有指定SA_SIGINFO，则函数原型为 fn(sig: SignalNo) -> ()，对应C语言原型为 void (*sa_handler)(int)
3. 若flags指定了SA_SIGINFO，则函数原型为 fn(sig: SignalNo, info: &SigInfo, ucontext: &mut UContext) -> ()， 对应C语言原型为 void (*sa_sigaction)(int, siginfo_t *, void *)。

其中，SigInfo和SignalNo的定义见siginfo.rs和signal_no.rs。 UContext即是处理信号时内核保存的用户态上下文，它存储在用户地址空间，会在调用sig_return时被恢复，定义见ucontext.rs。

sa_flags: SigActionFlags

信号处理的flags

restorer: usize

信号处理的跳板页地址，存储了sig_return的函数处理地址 仅在SA_RESTORER标志被设置时有效

sa_mask: usize

该信号处理函数的信号掩码

Implementations

impl SigAction

pub fn get_storer(&self) -> Option<usize>

get the restorer address of the signal action

When the SA_RESTORER flag is set, the restorer address is valid

or it will return None, and the core will set the restore address as the signal trampoline

Trait Implementations

impl Clone for SigAction

fn clone(&self) -> SigAction

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SigAction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for SigAction