Linux under C programming: Raise

The key to sending a signal is to let the system know which process to send the signal and what signal to send. It should be noted that the ability to send a particular signal to a process is closely related to the user's permissions. For example, only a system administrator can send a sigkill signal to terminate a process.

A system call used to send a signal.

#include <sys/types.h>     
         
#include <signal.h>     
         
#include <unistd.h>     
         
#include <sys/ time.h>     
         
int Kill (pid_t pid,int signumber);     
         
int raise (int signumber);     
         
unsigned int alarm (unsigned intseconds);     
         
int setitimer (int which,const structitimerval *value,struct itimerval *oldvalue);

Raise: Used to send a signal to the process itself. Successfully returns 0, failure returns-1.

#include <stdio.h>     
#include <signal.h>     
void func ();     
void Main ()     
{     
     charbuffer[100];     
     if (sig_err== signal (SIGINT,&FUNC))     
     {     
         printf ("signalerror!! \ n ");     
         Exit ( -1);     
     }     
     for (;;)     
     {     
         fgets (buffer,sizeof (buffer), stdin);     
         if (strcmp (buffer, "sigint\n") = = 0)     
              raise (SIGINT);     
         else 
              printf ("nocampare\n");     
     }     
         
void func ()     
{     
     printf ("hellofunc\n");     
}

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