进程和信号的简单例子

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>

static void sig_int(int);

int main(void){
   char buf[100];
   pid_t pid;
   int status;

   if(signal(SIGINT,sig_int) == SIG_ERR)
       printf("signal error");

   printf("$ ");
   while(fgets(buf,100,stdin) != NULL){
       if(buf[strlen(buf)-1] == '
')
           buf[strlen(buf)-1]=0;

       if( (pid = fork()) < 0){
           printf("fork error
");
       }else if(pid == 0){
           execlp(buf,buf,(char *)0);
           printf("couldn't execute:%s
",buf);
           exit(127);
       }

       if(pid = waitpid(pid,&status,0) < 0)
           printf("waitpid error
");

       printf("$ ");
   }
   exit(0);
}

void sig_int(int signo){
    printf("interrupt
");
    printf("$ ");
    fflush(NULL);
}

运行结果：