2019.03.20王苛震

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <sys/time.h>
  4 #include <signal.h>
  5 #include <string.h>
  6 #include <unistd.h>
  7
  8 #define    MAX        1024
  9
 10 typedef struct {
 11     int sec;
 12     void (*any)(void *);
 13     char *s;
 14 } alrm_st;
 15
 16 static alrm_st *p[MAX];
 17 static int flag;
 18
 19 void anytimer_alarm(int sec_cus, void (*any_cus)(void *s), void *s_cus);
 20 static void clk_first(void);
 21 static int _getpos(void);
 22 static void clk_fun(int s);
 23
 24 static void any1(void *s)
 25 {
 26     printf("%s", (char *)s);
 27     fflush(NULL);
 28 }
 29
 30 static void any2(void *s)
 31 {
 32     printf("%s", (char *)s);
 33     fflush(NULL);
 34 }
 35
 36 static void any3(void *s)
 37 {
 38     printf("%s", (char *)s);
 39     fflush(NULL);
 40 }
 41
 42 int main(void)
 43 {
 44     anytimer_alarm(3, any1, "hello");
 45     anytimer_alarm(2, any2, "world");
 46     anytimer_alarm(5, any3, "apue");
 47
 48     /*
 49      **world*hello**apue******
 50      */
 51     while (1) {
 52         write(1, "*", 1);
 53         sleep(1);
 54     }
 55
 56     return 0;
 57 }
 58
 59 void anytimer_alarm(int sec_cus, void (*any_cus)(void *s), void *s_cus)
 60 {
 61     int td = 0;
 62
 63     if (flag == 0) {　　　　//加载信号
 64         clk_first();
 65         flag == 1;
 66     }
 67     td = _getpos();　　　　//获取当前索引值
 68     if (td == -1)
 69         return;
 70
 71     p[td] = malloc(sizeof(alrm_st));　　　　//开辟静态区空间
 72     if (p[td] == NULL)
 73         return;
 74
 75     p[td]->sec = sec_cus;　　　　//配置结构体成员
 76     p[td]->any = any_cus;
 77     p[td]->s = malloc(sizeof(*s_cus));　　　　//开辟结构体存字符串的静态区空间
 78     if (p[td]->s == NULL) {
 79         free(p[td]);
 80         return;
 81     }
 82     strcpy(p[td]->s, s_cus);　　　　//拷贝参数中的字符串
 83 }
 84
 85 static void clk_first(void)　　　　//设置信号与时钟
 86 {
 87     struct itimerval val, oldval;
 88     struct sigaction act, oldact;
 89
 90     val.it_interval.tv_sec = 1;
 91     val.it_interval.tv_usec = 0;
 92     val.it_value.tv_sec = 1;
 93     val.it_value.tv_usec = 0;
 94     setitimer(ITIMER_REAL, &val, &oldval);
 95
 96     act.sa_handler = clk_fun;
 97     sigemptyset(&act.sa_mask);
 98     act.sa_flags = 0;
 99     sigaction(SIGALRM, &act, &oldact);
100 }
101
102 static int _getpos(void)　　　　//1024上限 从头分配
103 {
104     for (int i = 0; i < MAX; i++) {
105         if (p[i] == NULL) {
106             return i;
107         }
108     }
109     return -1;        //无空间
110 }
111
112 static void clk_fun(int s)　　　　//函数倒计时
113 {
114     for (int i = 0; i < MAX; i++) {
115         if (p[i] != NULL) {
116             p[i]->sec -= 1;
117             if (p[i]->sec == 0)
118                 p[i]->any(p[i]->s);
119         }
120     }
121 }

kkj@:~/apue_my/hw3$ ./clock 　　　　　　//终端编译结果
**world*hello**apue******^C

原文地址：https://www.cnblogs.com/ymfqq/p/10585874.html