_kbhit() for linux

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传送门：http://cboard.cprogramming.com/c-programming/63166-kbhit-linux.html

#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <termios.h>#include <unistd.h>#include <fcntl.h> int kbhit(void){  struct termios oldt, newt;  int ch;  int oldf;   tcgetattr(STDIN_FILENO, &oldt);  newt = oldt;  newt.c_lflag &= ~(ICANON | ECHO);  tcsetattr(STDIN_FILENO, TCSANOW, &newt);  oldf = fcntl(STDIN_FILENO, F_GETFL, 0);  fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);   ch = getchar();   tcsetattr(STDIN_FILENO, TCSANOW, &oldt);  fcntl(STDIN_FILENO, F_SETFL, oldf);   if(ch != EOF)  {    ungetc(ch, stdin);    return 1;  }   return 0;}  main( int argc, char** argv ){    char *input = argv[0];    int nomor = argc;    pid_t pid = 0;    /* set stuff up */    /* accept command line args */         pid = fork();    if( pid == 0 ){        /* this is the "background" process.  Execute process loop here */        int x=0;            while(1)        {            if(kbhit())              printf("you hit keyboard");        }    }    else {        /* "foreground" process exits */        exit(0);    }}

具体含义，有的解释是等待键盘输入；但此处用意为在 ios下使用while( !kbhit()) 控制openal的音效的循环播放.

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