Question

我正在尝试使用sigaction来忽略ctrl-c。代码到底有助于理解。问题是当我按ctrl-C， ^ Cctrl-c 出现而不是 ^ C 时，它不会打印立即提示。只有在我点击 Enter 之后，它才会开始打印提示。像这样：

> // run the program sigAction
$./sigAction
sigAction>^Cctrl-C
// it is waiting,waiting . Nothing happens until I hit Enter, next prompt comes up.

sigAction>

我正在寻找的结果是当我点击ctrl-C而没有按Enter键时，下一个提示应该立即出现。问题如下：

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <signal.h>
  4 #include <string.h>
  5 // implement ignoring ctrl-C
  6 void sigIntHandler(int signum) {
  7     fprintf(stderr, "ctrl-C\n" );
  8   
  9 }
 10
 11 main()
 12 {
 13
 14     struct sigaction signalAction;
 15     signalAction.sa_handler = sigIntHandler;
 16     sigemptyset(&signalAction.sa_mask);
 17     signalAction.sa_flags = SA_RESTART;
 18     sigaction(SIGINT, &signalAction, NULL);
 19     while(1) {
 20
 21         char block[4096];
 22
 23         printf("sigAction>");
 24         fflush(stdout);
 25
 26         fgets(block, 4096, stdin);
 27        
 28         if (!strcmp(block, "exit\n")) {
 29            exit(1);
 30         }
 31     } 
 32 }

当我使用gdb查看内部时，它给出了以下信息：

  (gdb) n
Single stepping until exit from function main,
which has no line number information.
sigAction>^C
Program received signal SIGINT, Interrupt.
0x00007ffff7b15d10 in __read_nocancel () from /lib64/libc.so.6
(gdb) n
Single stepping until exit from function __read_nocancel,
which has no line number information

任何想法都有帮助！提前谢谢！

使用sigaction实现ctr-c

0 个答案: