在console下按Ctrl－C后确实发送了SIGINT信号，但是gdb里的缺省设置将会导致由GDB截获的该信息，调试的应用程序无法接受到该信号。
有两种方法可以使调试的应用程序接受到信号：
（1）改变gdb信号处理的设置
比如,以下设置会告诉gdb在接收到SIGINT时不要停止、打印出来、传递给调试目标程序
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(gdb) handle SIGINT nostop print pass
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) y
Signal Stop Print Pass to program Description
SIGINT No Yes Yes Interrupt
(gdb)
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（2）使用gdb命令直接向调试的应用程序发送信号
首先在你希望发送信号的语句处设置断点，然后运行程序，当停止到断点所在位置后，用gdb的signal命令发送信号给调试目标程序
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(gdb) signal SIGINT
Continuing with signal SIGINT.
Breakpoint 1, handler (signal=2) at main.cpp:15
15 printf( "Signal handler.../n ");
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