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getcwd/getwd : È¡µÃĿǰËùÔÚĿ¼  
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char * getcwd(char *buf,size_t size);  
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#include   
char *getwd(char *buf);  
getwdÊǸöΣÏյĺ¯Êý£¬Ò»°ã¶¼»áÇ¿ÁÒ½¨Òé²»ÒªÓã¬ÒòΪÄúÎÞ·¨È·¶¨×µÄĿ¼³¤¶ÈΪ¶àÉÙ¡£PATH_MAX¶¨ÒåÁË×µÄ·¾¶³¤¶È¡£ÔÚLinuxÏÂËùÒÔÌṩÕâ¸öº¯ÊýÖ÷ÒªÊÇÒòΪ¡¸´«Í³¡¹¡£  
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//»ñȡϵͳĿ¼×î´ó³¤¶È
long pathconf(char* path, int flag);
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chdir/fchdir/chroot : ¸Ä±äĿǰËùÔÚĿ¼  
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#include   
int chdir(const char * pathname);  
int fchdir(int fd);  
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if(chdir("..")==-1){
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        return 1;
    }
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#include   
int chroot(const char * path);  
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/*
  Name: SndKit.c
  Copyright: GPLv2
  Author: rockins(ybc2084@163.com)
  Date: 15-10-06 18:22
  Description: implent raw sound record/play
  run: ./SndKit [-h] [-d device] [-c channel] [-b bits] [-f hz] [-l len] <-r|-p file>
  e.g.:
  ./SndKit ......

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# ./configure --prefix=/usr/local/terry_yu/cvs
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