学习 Linux高级编程06_B

 

Atexit1.c

#include<stdio.h> #include<stdlib.h>   void fun() {          printf("over\n"); }   main() {          atexit(fun);          printf("Process!\n"); }

 

Setlock1.c

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<fcntl.h>   main() {                    int  fd;                    struct  flock lk;                    int  r;                    //1  打开一个文件                    fd  = open("a.txt", O_RDWR)                    if(fd  == -1)                    {                             printf(":%m\n"),exit(-1);                    }                    //2  描述锁                    lk.l_type  = F_WRLCK;                    lk.l_wence  = SEEK_SET;                    lk.l_start  = 5;                   lk.l_len = 10;                    //3  加锁                    r  = fctnl(fd, F_SETLK, &lk);                    if(r  == 0)                    {                             printf("lock  success!\n");                    }                    else                    {                             printf("lock  fail!\n");                    }                    while(1);                    }

Getlock1.c

#include<stdlio.h> #include<stdlib.h> #include<unistd.h> #include<fcntl.h>   main() {          int  fd;          struct  flock lk;          int  r;                   fd  = open("a.txt", O_RDWR);          if(fd  = -1)          {                    printf("::m\n"),  exit(-1);          }          r  = fcntl(fd, F_GETLK, &lk);          if(r  == 0)          {                    printf("get  lock success!\n");          }          if(lk.l_type  == F_WRLCK)          {                    printf("write  lock\n");          }          printf("start:  %d, len: %d \n", lk.l_start, lk.l_len);          }

 

Singnaldeal.c

#include<unistd.h> #include<stdio.h> #include<signal.h>   main() {          while(1)          {                    printf("processing  exec");                    sleep(1);          } }

Ctrl+c 发出的就是信号2 SIGINT

#include<unistd.h> #include<stdio.h> #include<signal.h>   void handle(int s) {          printf("This  is a signal happens"); }   main() {          signal(SIGINT,handle);          while(1)          {                    printf("processing  exec");                    sleep(1);          } }

#include<unistd.h> #include<stdio.h> #include<signal.h>   main() {          while(1)          {                    printf("processing  exec %d", getpid());                    sleep(1);          } }

#include<stdio.h> #include<signal.h>   main() {          while(1)          {                    kill(22535,SIGINT);                    sleep(2);          }          }

 

Alarm1.c

#include<stdio.h> #include<signal.h>   void deal(int s) {          printf("get  up\n"); }   main() {          signal(SIGALRM,  deal);          alerm(5);                   while(1)          {          } }

#include<stdio.h> #include<signal.h> #include<sys/time.h>   void deal(int s) {          printf("get  up\n"); }   main() {          struct  itimerval v={0};          signal(SIGALRM,  deal);                   v.it_value.tv_sec  = 3;          v.it_interval.tv_sec  =1;          setitimer(ITIMER_REAL,  &v, 0);                   while(1)          {                    printf("          } }

 

Demo2.c

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<fcntl.h> #include<signal.h> #include<curses.h> #include<math.h> //rand() #include<time.h>   int num, i; WINDOW *wtime, *wnumb; main() {          initscr();  //LINES COLS初始          curs_set0);  //隐藏光标          //绘制窗体          wnumb  = derwin(stdscr, 3, 11, (LINES-3)/2, (COLS-11)/2);          //初始化屏幕，占用行，列。在屏幕中的位置          wtime  = derwin(stdscr, 3, 10, 1, (COLS-10));          //添加边框          box(wnumb,  0, 0);          box(wtime,  0, 0);          //刷屏          refresh();          wrefresh(wtime);          wrefresh(wnumb);          while(1)          {                    num  = 0;                    for(i  = 0; i < 7; i ++)                    {                             num  = num*10 + rand()%10;                    }                    mvwprintw(wnumb,  1, 2, "%07", num);                    refresh();                    wrefresh(wnumb);                    wrefresh(wtime);                                       unsleep(10000);                             }          endwin(); }

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<fcntl.h> #include<signal.h> #include<curses.h> #include<math.h> //rand() #include<time.h> #include<sys/time.h> #include<string.h> //bzero   int num, i; WINDOW *wtime, *wnumb;   void showtime(int s) {          time_t  tt;//long          struct  tm *t;          if(s  == SIGALRM)          {                    tt  = time(0);                    t  = localtime(&tt);                    mvwprintw(wtime,  1, 1, "%02d:%02d:%02d", t->tm_hour, t->tm_min, t->tm_sec);                    refresh();                    wrefresh(wtime);                    wrefresh(wnumb);          } }   main() {          struct  itimerval  val;          bzero(&val,  sizeof(struct itimerval)); //初始为0          val.it_value.tv_sec  = 0; //延时时间          val.it_value.tv_usec  = 1;          val.it_interval.tv_sec  = 1; //间隔时间          initscr();  //LINES COLS初始                   //绑定信号          signal(SIGALRM,  showtime);                   curs_set0);  //隐藏光标          //绘制窗体          wnumb  = derwin(stdscr, 3, 11, (LINES-3)/2, (COLS-11)/2);          //初始化屏幕，占用行，列。在屏幕中的位置          wtime  = derwin(stdscr, 3, 10, 1, (COLS-10));          //添加边框          box(wnumb,  0, 0);          box(wtime,  0, 0);                   setitimer(ITIMER_REAL,  &val, 0);//初始化屏幕后调用定时器                   //刷屏          refresh();          wrefresh(wtime);          wrefresh(wnumb);          while(1)          {                    num  = 0;                    for(i  = 0; i < 7; i ++)                    {                             num  = num*10 + rand()%10;                    }                    mvwprintw(wnumb,  1, 2, "%07", num);                    refresh();                    wrefresh(wnumb);                    wrefresh(wtime);                                       unsleep(10000);                             }          endwin(); }

 

Demo3.c

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<string.h> #include<signal.h> #include<curses.h> #include<math.h>   WINDOW *w; int num, i; main() {          initscr();          w  = derwin(stdscr, 3, 11, (LINES - 3)/2, (COLS - 11));          box(w,  0, 0);          refresh();          wrefresh(w);          while(1)          {                    num  =0;                    for(i  = 0; i < 7; i ++)                    {                             num  = num * 10 + rand()%10;                    }                    mvwprintw(w,  1, 2, "%07d", num);                    refresh();                    wrefresh(w);                    usleep(1000);                     }          endwin(); }

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<string.h> #include<signal.h> #include<curses.h> #include<math.h>   WINDOW *w; int num, i;   int isstop = 0; void handle(int s) {          if(s  == SIGUSR1)          {                    if(isstop  == 0)                    {                             isstop  = 1;                    }                    else                    {                             isstop  = 0;                    }          } }   main() {          initscr();          curs_set(0);  //0隐藏光标 1,2显示光标          keypad(stdscr,  TRUE); //支持功能键          keypad(w,  TRUE); //支持功能键          noecho();  //关闭回显          w  = derwin(stdscr, 3, 11, (LINES - 3)/2, (COLS - 11));          box(w,  0, 0);          refresh();          wrefresh(w);                   if(fork())          {                    signal(SIGUSR1,  handle);                    while(1)                    {                             if(isstop  == 1)                             {                                      pause();  //                             }                             num  =0;                             for(i  = 0; i < 7; i ++)                             {                                      num  = num * 10 + rand()%10;                             }                             mvwprintw(w,  1, 2, "%07d", num);                             refresh();                             wrefresh(w);                             usleep(1000);                               }          }          else  //子进程          {                    //等待输入                    int  ch;                    while(1)                    {                             ch  = getch();                             if(ch  == KEY_ENTER)                             {                                      kill(getppid(),  SIGUSR1) //getppid() 得到父进程ID                             }                    }          }                            endwin(); }

 

Demotest.c

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<signal.h> #include<math.h> #include<curses.h>   WINDOW *w; int num;   main() {          initscr();          curs_set(0);  //隐藏光标          noecho();  //禁止输入回显          w  = derwin(stdscr, 3, 11, (LINES- 3)/2, (COLS - 11)/2); //创建子窗体          box(w,  0, 0); //给子窗体家边框          refresh();          wrefresh(w);          //显示7位随机数          while(1)          {                    num  = random() % 100000000;                    mvwprintw(w,  1, 2, "%07d", num);                    refresh();                    wrefresh(w);                    usleep(10000);          }                   endwin(); }

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<signal.h> #include<math.h> #include<curses.h>   WINDOW *w; int num; int isstop = 0;   void handle(int s) {          if(s  == SIGUSR1)          {                    if(isstop  == 1)                    {                             isstop  = 0;                    }                    else                    {                             isstop = 1;                    }          } } main() {          initscr();          curs_set(0);  //隐藏光标          noecho();  //禁止输入回显          w  = derwin(stdscr, 3, 11, (LINES- 3)/2, (COLS - 11)/2); //创建子窗体          box(w,  0, 0); //给子窗体家边框          refresh();          wrefresh(w);          //显示7位随机数          if(fork())          {                    signal(SIGUSR1,  handle);                    while(1)                    {                             if(isstop  == 1)                             {                                      pause();  //pause会被信号中断停止                             }                             num  = random() % 100000000;                             mvwprintw(w,  1, 2, "%07d", num);                             refresh();                             wrefresh(w);                             usleep(10000);                    }          }          else          {                    //处理按键                    while(1)                    {                             getch();                             kill(getppid(),  SIGUSR1);                    }          }                            endwin(); }

 

 

Signal5.c

#include<unistd.h> #include<stdio.h> #include<signal.h>   void handle(int s) {          printf("This  is a signal happens");          sleep(5); }   main() {          signal(SIGINT,handle);          while(1)          {          } }

Kill5.c

#include<stdio.h> #include<signal.h>   main() {          int  i;          for(i  = 0; i < 5; i ++)          {                    kill(3207,SIGINT);                    sleep(2);          } }

 

Mask1.c

#include<stdio.h> #include<signal.h>   main() {          int  sum = 0;          int  i;          for(i  = 1; i <= 10; i ++)          {                    sum  += i;                    sleep(1);          }          printf("sum  =%d", sum);          printf("Over\n"); }

#include<stdio.h> #include<signal.h>   main() {          int  sum = 0;          int  i;          sigset_t  sigs; //信号集合          sigemptyset(&sigs);  //初始化清空          sigaddset(&sigs,  SIGINT);          sigprocmask(SIG_BLOCK,  &sigs, 0);          for(i  = 1; i <= 10; i ++)          {                    sum  += i;                    sleep(1);          }          printf("sum  =%d", sum);          sigprocmask(SIG_UNBOLOCK,  &sigs, 0);          printf("Over\n"); }

#include<stdio.h> #include<signal.h>   main() {          int  sum = 0;          int  i;          sigset_t  sigs, sigp; //信号集合          sigemptyset(&sigs);  //初始化清空          sigemptyset(&sigp);          sigaddset(&sigs,  SIGINT);          sigprocmask(SIG_BLOCK,  &sigs, 0);          for(i  = 1; i <= 10; i ++)          {                    sum  += i;                    sigpending(&sigp);                    if(sigismember(&sigp,SIGINT))                    {                             printf("sigp  in\n");                    }                    sleep(1);          }          printf("sum  =%d", sum);          sigprocmask(SIG_UNBOLOCK,  &sigs, 0);          printf("Over\n"); }

#include<stdio.h> #include<signal.h>   void h(int s) {          printf("is  not pingbi signal happend!\n"); }   #main {          sigset_t  sigs;          signal(SIGUSR1,  h);                   sigemptyset(&sigs);          sigaddset(&sigs,  2);          printf("pingbi  start!\n");          sigsuspend(&sigs);          printf("pingbi  end!\n");          }

#include<stdio.h> #include<signal.h> void h(int s) {          printf("chou  kong chuli"); } main() {          int  sum = 0;          int  i;          sigset_t  sigs, sigp, sigq; //信号集合          sigemptyset(&sigs);  //初始化清空          sigemptyset(&sigp);          sigemptyset(&sigq);          sigaddset(&sigs,  SIGINT);          sigprocmask(SIG_BLOCK,  &sigs, 0);          for(i  = 1; i <= 10; i ++)          {                    sum  += i;                    sigpending(&sigp);                    if(sigismember(&sigp,SIGINT))                    {                             printf("sigp  in\n");                             suspend(&sigq);                             //使原来屏蔽信号无效，开放原来信号                             //使新的信号屏蔽                             //当某个信号处理函数处理完毕                             //sigsuspend恢复原来屏蔽信号，返回                    }                    sleep(1);          }          printf("sum  =%d", sum);          sigprocmask(SIG_UNBOLOCK,  &sigs, 0);          printf("Over\n"); }