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

#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
            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.