补充课后作业

ch10/homework/kehou3.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/socket.h>
+
+int main(int argc, char *argv[])
+{
+    pid_t pid;
+    int sockfd = socket(PF_INET, SOCK_STREAM, 0);
+
+    pid = fork();
+    if(pid == 0)
+    {
+        printf("Child sockfd: %d \n", sockfd);
+    }
+    else
+    {
+        printf("Parent sockfd: %d \n", sockfd);
+    }
+    return 0;
+}
+
+/*
+结果：
+Parent sockfd: 3 
+Child sockfd: 3 
+*/

ch10/homework/kehou5.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+
+void ctrl_handling(int sig);
+
+int main(int argc, char *argv[])
+{
+    struct sigaction act;
+    act.sa_handler = ctrl_handling;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = 0;
+    sigaction(SIGINT, &act, 0);//输入ctrl+c发出信号
+    
+    while(1)
+    {
+        sleep(1);
+        puts("美好的一天！");
+    }
+    return 0;
+}
+
+void ctrl_handling(int sig)
+{
+    char c;
+    if(sig == SIGINT)
+    {
+        fputs("Do you want to exit(Y to exit)?", stdout);
+        scanf("%c", &c);
+        if(c == 'y' || c == 'Y')
+            exit(1);
+    }
+}