csignal头文件声明了函数raise()以处理特定信号。 Signal在程序中学习了一些异常行为，并调用了信号处理程序。它用于检查是否将调用默认处理程序或将其忽略。
句法：
int raise ( int signal_ )参数：该函数接受单个参数sig ，该参数指定人为引发的信号。它可以接受任何6 C标准信号。
定义的信号类型
- SIGILL
- SIGINT
- 西格斯
- SIGTERM
- SIGABRT
- 信息系统
返回值：返回非零值，信号中无错误，否则返回零。该函数返回具有不同定义信号的不同非零元素。
下面的程序说明了上述方法：
程序1：
// C++ program to illustrate the
// raise() function when SIGABRT is passed
#include
#include
using namespace std;
sig_atomic_t s_value = 0;
void handle(int signal_)
{
s_value = signal_;
}
int main()
{
signal(SIGABRT, handle);
cout << "Before called Signal = " << s_value << endl;
raise(SIGABRT);
cout << "After called Signal = " << s_value << endl;
return 0;
}
输出：
Before called Signal = 0
After called Signal = 6
程式2：
// C++ program to illustrate the
// raise() function when SIGINT is passed
#include
#include
using namespace std;
sig_atomic_t s_value = 0;
void handle(int signal_)
{
s_value = signal_;
}
int main()
{
signal(SIGINT, handle);
cout << "Before called Signal = " << s_value << endl;
raise(SIGINT);
cout << "After called Signal = " << s_value << endl;
return 0;
}
输出：
Before called Signal = 0
After called Signal = 2
程序3：
// C++ program to illustrate the
// raise() function when SIGTERM is passed
#include
#include
using namespace std;
sig_atomic_t s_value = 0;
void handle(int signal_)
{
s_value = signal_;
}
int main()
{
signal(SIGTERM, handle);
cout << "Before called Signal = " << s_value << endl;
raise(SIGTERM);
cout << "After called Signal = " << s_value << endl;
return 0;
}
输出：
Before called Signal = 0
After called Signal = 15
计划4：
// C++ program to illustrate the
// raise() function when SIGSEGV is passed
#include
#include
using namespace std;
sig_atomic_t s_value = 0;
void handle(int signal_)
{
s_value = signal_;
}
int main()
{
signal(SIGSEGV, handle);
cout << "Before called Signal = " << s_value << endl;
raise(SIGSEGV);
cout << "After called Signal = " << s_value << endl;
return 0;
}
输出：
Before called Signal = 0
After called Signal = 11
计划5：
// C++ program to illustrate the
// raise() function when SIGFPE is passed
#include
#include
using namespace std;
sig_atomic_t s_value = 0;
void handle(int signal_)
{
s_value = signal_;
}
int main()
{
signal(SIGFPE, handle);
cout << "Before called Signal = " << s_value << endl;
raise(SIGFPE);
cout << "After called Signal = " << s_value << endl;
return 0;
}
输出：
Before called Signal = 0
After called Signal = 8
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