signal

1. linux 下各信号的解释：  man 7 signal

       Signal     Value     Action   Comment

       -------------------------------------------------------------------------

       SIGHUP        1       Term    Hangup detected on controlling terminal

                                     or death of controlling process

       SIGINT        2       Term    Interrupt from keyboard

       SIGQUIT       3       Core    Quit from keyboard

       SIGILL        4       Core    Illegal Instruction

       SIGABRT       6       Core    Abort signal from abort(3)

       SIGFPE        8       Core    Floating point exception

       SIGKILL       9       Term    Kill signal

       SIGSEGV      11       Core    Invalid memory reference

       SIGPIPE      13       Term    Broken pipe: write to pipe with no readers

       SIGALRM      14       Term    Timer signal from alarm(2)

       SIGTERM      15       Term    Termination signal

       SIGUSR1   30,10,16    Term    User-defined signal 1

       SIGUSR2   31,12,17    Term    User-defined signal 2

       SIGCHLD   20,17,18    Ign     Child stopped or terminated

       SIGCONT   19,18,25            Continue if stopped

       SIGSTOP   17,19,23    Stop    Stop process

       SIGTSTP   18,20,24    Stop    Stop typed at tty

       SIGTTIN   21,21,26    Stop    tty input for background process

       SIGTTOU   22,22,27    Stop    tty output for background process

 

SIGPIPE      13       Term    Broken pipe: write to pipe with no readers

 

注意：

The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.

 

2. 编写程序处理自己程序接收到信号量的反应

       #include <signal.h>

 

       typedef void (*sighandler_t)(int);

 

       sighandler_t signal(int signum, sighandler_t handler);