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Ïà¹Øº¯Êý signal£¬sleep
±íÍ·Îļþ #include<unistd.h>
¶¨Ò庯Êý unsigned int alarm(unsigned int seconds);
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·¶Àý #include<unistd.h>
#include<signal.h>
void handler() {
printf("hello\n");
}
main()
{
int i;
signal(SIGALRM,handler);
alarm(5);
for(i=1;i<7;i++){
printf("sleep %d ...\n",i);
sleep(1);
}
}
Ö´ÐÐ sleep 1 ...
sleep 2 ...
sleep 3 ...
sleep 4 ...
sleep 5 ...
hello
sleep 6 ...
¡¡
kill£¨´«ËÍÐźŸøÖ¸¶¨µÄ½ø³Ì£©
Ïà¹Øº¯Êý raise£¬signal
±íÍ·Îļþ #include<sys/types.h>
#include<signal.h>
¶¨Ò庯Êý int kill(pid_t pid,int sig);
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ESRCH ²ÎÊýpid ËùÖ¸¶¨µÄ½ø³Ì»ò½ø³Ì×é²»´æÔÚ
EPERM ȨÏÞ²»¹»ÎÞ·¨´«ËÍÐźŸøÖ¸¶¨½ø³Ì
·¶Àý #include<unistd.h>
#include<signal.h>
#include<sys/types.h>
#include<sys/wait.h>
main()
{
pid_t pid;
int status;
if(!(pid= fork())){
printf("Hi I am child process!\n");
sleep(10);
return;
}
else{
printf("send signal to child process (%d) \n",pid);
sleep(1);
kill(pid ,SIGABRT);
wait(&status);
if(WIFSIGNALED(status))
printf("chile process receive signal %d\n",WTERMSIG(status));
}
}
Ö´ÐÐ sen signal to child process(3170)
Hi I am child process!
child process receive signal 6
pause£¨Èýø³ÌÔÝÍ£Ö±µ½ÐźųöÏÖ£©
Ïà¹Øº¯Êý kill£¬signal£¬sleep
±íÍ·Îļþ #include<unistd.h>
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