sigaction 的例子

为了懒省事，我用了apue.h

#include <apue.h>

void diediedie(int sig)
{
    fputs("Goodby curel word......\n",stdout);
    exit(1);
    }

int catch_signal(int sig,void(*handler)(int))
{
    struct sigaction action;
    action.sa_handler=handler;
    sigemptyset(&action.sa_mask);
    action.sa_flags=0;
    return sigaction(sig,&action,NULL);
    }

int main()
{
    if(catch_signal(SIGINT,diediedie)==-1)
    {
        fputs("Can't map the handler",stderr);
        exit(2);
        }
    char name[30];
    printf("Enter your name:");
    fgets(name,30,stdin);
    printf("Hello %s\n",name);
    if(catch_signal(SIGINT,SIG_DFL)==-1)
    {
        fputs("Can't not restore the handler to default\n",stderr);
        exit(2);
        }
    printf("Enter your name:");
    fgets(name,30,stdin);
    printf("Hello %s\n",name);


    return 0;
    }

下面是一些SIGNAL，可以用kill -l 查看signal.

SIGINT: The process was interrupted
SIGQUIT: Someone asked the process to stop and dump the memory in a core dump file
SIGFPE: Floating-point error
SIGTRAP: The debugger asks where the process is
SIGSEGV: The process try to access illegal memory
SIGWINCH: The terminal window changed size
SIGTERM: Someone just asked the kernel to kill the process.
SIGPIPE: The process wrote to a pipe that nothing

#raise() send a signal to the caller
catch_signal(SIGTERM,SIG_DEFL);        #handle SIGTERM in the default way
catch_signal(SIGINT,SIG_IGN);          #ignore the SIGINT signal
#这两个常量是定义在signal.h

这个哥们的signal系列写的不错：
http://blog.chinaunix.net/uid-24774106-id-4064447.html