Kill命令模拟1

#include<sys/types.h>
#include<signal.h>
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>

int main(int argc,char* argv[])
{
    pid_t pid_id=0;
    char* pid;
    if(argc!=2)
    {
        fprintf(stderr,"Usage: kill pid \n");
        exit(1);
    }
    pid=argv[1];
    while((*pid)!=‘\0‘)
    {
        pid_id=pid_id*10+(*pid-48);
        pid++;
    }
    if(kill(pid_id,SIGINT))
    {
        fprintf(stderr,"Could not kill pid %d \n",pid_id);
        exit(1);
    }
    else
    {
        printf("Kill the pid %d successfully!\n",pid_id);
    }
    exit(0);
}