作业--2.22 王成明

main.c

 1 #include <stdio.h>
 2 #include <unistd.h>
 3 
 4 #include "myalarm.h"
 5 
 6 int main(void)
 7 {
 8     anytimer_alarm(3, any1, "hello");
 9     anytimer_alarm(2, any2, "world");
10     anytimer_alarm(5, any3, "apue");
11     /*
12      **world*hello**apue******
13      */
14     while (1) {
15         write(1, "*", 1);
16         sleep(1);
17     }
18     return 0;
19 }

myalrm.c

  1 #include <stdio.h>
  2 #include <signal.h>
  3 #include <stdlib.h>
  4 #include <sys/time.h>
  5 #include <unistd.h>
  6 #include <errno.h>
  7 
  8 #include "myalarm.h"
  9 
 10 int inited=0;
 11 
 12 typedef struct anyalarm
 13 {
 14     int sec;
 15      void (*fcntl)(void *);
 16     char *str;
 17 }ANYALRM;
 18 
 19 ANYALRM *alr[ALRSIZE];
 20 static struct sigaction oldact;
 21 static struct itimerval olditv;
 22 
 23 static void alrm_handler(int s)
 24 {
 25     for(int i=0;alr[i]!=NULL;i++){
 26         alr[i]->sec-=1;
 27         if(alr[i]->sec == 0){
 28             alr[i]->fcntl(alr[i]->str);
 29             free(alr[i]);
 30         }
 31     }
 32     
 33 }
 34 
 35 void moduler_load()
 36 {
 37     struct sigaction act;
 38     struct itimerval itv;
 39 
 40     act.sa_handler = alrm_handler;
 41     act.sa_flags = 0;
 42     sigemptyset(&act.sa_mask);
 43     sigaction(SIGALRM, &act, &oldact);
 44 
 45     itv.it_interval.tv_sec = 1;
 46     itv.it_interval.tv_usec = 0;
 47     itv.it_value.tv_sec = 1;
 48     itv.it_value.tv_usec = 0;
 49     setitimer(ITIMER_REAL, &itv, &olditv);
 50 
 51     atexit(moduler_unload);
 52 }
 53 
 54 // 信号行为和时钟的恢复
 55 void moduler_unload()
 56 {
 57     sigaction(SIGALRM, &oldact, NULL);
 58     setitimer(ITIMER_REAL, &olditv, NULL);
 59 }
 60 
 61 void any1(void *s)
 62 {
 63     printf("%s\n",(char *)s);
 64 }
 65 
 66 void any2(void *s)
 67 {
 68     printf("%s\n",(char *)s);
 69 }
 70 
 71 void any3(void *s)
 72 {
 73     printf("%s\n",(char *)s);
 74 }
 75 
 76 int alr_init(int sec, void (*fcntl)(void *),char *str)
 77 {
 78     ANYALRM *alrm=NULL;
 79     //第一次调用
 80     if(inited == 0){
 81         moduler_load();
 82         inited=1;
 83     }
 84     alrm=malloc(sizeof(ANYALRM));
 85     if(alrm == NULL){
 86         fprintf(stderr,"malloc is failed!\n");
 87     }
 88     alrm->sec=sec;
 89     alrm->fcntl=fcntl;
 90     alrm->str=str;
 91     for(int i=0;i<ALRSIZE;i++){
 92         if(alr[i] == NULL)
 93         {
 94             alr[i]=alrm;
 95             return i;
 96         }
 97     }
 98     return -1;
 99 
100 }
101 
102 void anytimer_alarm(int sec, void (*fcntl)(void *),char *str)
103 {
104     if(alr_init(sec,fcntl,str) < 0){
105         fprintf(stderr,"alr_init failed\n");
106         return ;
107     }
108 //    printf("------------anytime_alarm---------\n");
109 }

myalarm.h

 1 #ifndef __MYALARM_H
 2 #define __MYALARM_H
 3 
 4 #define ALRSIZE 1024
 5 
 6 void any1(void *s);
 7 void any2(void *s);
 8 void any3(void *s);
 9 
10 void anytimer_alarm(int sec, void (*fcntl)(void *),char *str);
11 
12 int alr_init(int sec, void (*fcntl)(void *),char *str);
13 
14 
15 void alarm_handler(int s);
16 
17 int alr_init(int sec,void (*fcntl)(void *),char *str);
18 
19 void moduler_load(void);
20 
21 void moduler_unload(void);
22 
23 #endif

makefile

 1 main : main.o myalarm.o
 2     gcc main.o myalarm.o -o main
 3 clean :
 4     rm -rf *.o main

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