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http://www.openchess.org/noitatsko/programming/ (2001-05-24 16:47:48)
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POSIX IPC 
reliable/unreliable 
reentrant 
pending 
sending signals 
catching signals 
manipulating 
signal definitions 
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ÐźÅsingals
ÐźŵĴ¦Àí¿ÉÒÔÓÃÒ»´óÕÂÀ´Ð´£¬Éæ¼°µÄ²ãÃæÒ²»áÉîÈëÕû¸ö×÷ҵϵͳÖУ¬ÎÒ²¢²»´òËãÕâÑù×ö£¬ÒòΪÄú¿ÉÄÜ»áÔ½¸ãÔ½ÃÔºý¡£ÕâÀïÎÒÖ»¸æËßÄúÈçºÎ½ÓÉÏÐźţ¬ÔÚʵÓõIJãÃæÉÏ£¬ÕâÑù±ãºÜ¹»ÓÃÁË¡£Äú¿ÉÒÔÏÈÀûÓÃÕâЩ»ù±¾µÄ¼¼ÇÉÀ´×«Ð´³Ìʽ£¬µÈµ½ÓнøÒ»²½¸ßµÈÓ¦ÓõÄÐèҪʱ£¬ÕÒÒ»±¾½ÏÉîÈëµÄUNIX Programming½Ì²Ä£¬×¨ÃÅÑо¿signalµÄд·¨¡£ 
Ò»°ã¼òµ¥µÄsignalд·¨ÈçÏÂ: 
void mysignal(int signo) 
{ 
  /* my signal handler */ 
} 
void initsignal(void) 
{ 
  struct sigaction act; 
  act.sa_handler = mysignal; 
  act.sa_flags   = 0; 
  sigemptyset(&act.sa_mask); 
  sigaction(SIGHUP,&act,NULL); 
  sigaction(SIGINT,&act,NULL); 
  sigaction(SIGQUIT,&act,NULL); 
  sigaction(SIGILL,&act,NULL); 
  sigaction(SIGTERM,&act,NULL); 
} 
  
ÀýÒ»: lock.c
ÔÚforkµÄÀýÈýÖÐÌáµ½£¬ÔÚdaemon±»É±µôʱ£¬ÐèÒªÔÚÀ뿪ǰ£¬½«/var/run/lock.pidɾ³ý¡£ÕâÀïÎÒÃÇ¿ÉÒÔÀûÓÃsignalÀ´´¦ÀíÕâ¼þÊ¡£ 
#include
#include
#include
#include
#define LOCK_FILE "/var/run/lock.pid"
void quit(int signo)
{
printf("Receive signal %d\n",signo);
unlink(LOCK_FILE);
exit