进程和信号的简单例子

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <unistd.h>
 4 #include <stdlib.h>
 5 #include <sys/wait.h>
 6 
 7 static void sig_int(int);
 8 
 9 int main(void){
10    char buf[100];
11    pid_t pid;
12    int status;
13 
14    if(signal(SIGINT,sig_int) == SIG_ERR)
15        printf("signal error");
16 
17    printf("$ ");
18    while(fgets(buf,100,stdin) != NULL){
19        if(buf[strlen(buf)-1] == ‘\n‘)
20            buf[strlen(buf)-1]=0;
21 
22        if( (pid = fork()) < 0){
23            printf("fork error\n");
24        }else if(pid == 0){
25            execlp(buf,buf,(char *)0);
26            printf("couldn‘t execute:%s\n",buf);
27            exit(127);
28        }
29 
30        if(pid = waitpid(pid,&status,0) < 0)
31            printf("waitpid error\n");
32 
33        printf("$ ");
34    }
35    exit(0);
36 }
37 
38 void sig_int(int signo){
39     printf("interrupt\n");
40     printf("$ ");
41     fflush(NULL);
42 }