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opendir -> readdir -> closedir
#include <dirent.h>
DIR *opendir(const char *dirname);
#include <dirent.h>
struct dirent *readdir(DIR *dirp);
#include <dirent.h>
int closedir(DIR *dirp);
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opendirÓÃÓÚ´ò¿ªÄ¿Â¼£¬ÊÇÀàËÆÓÚÁ÷µÄÄÇÖÖ·½Ê½£¬·µ»ØÒ»¸öÖ¸ÏòDIR½á¹¹ÌåµÄÖ¸ÕëËûµÄ²ÎÊý*dirnameÊÇÒ»¸ö×Ö·ûÊý×é»òÕß×Ö·û´®³£Á¿,
readdirº¯ÊýÓÃÓÚ¶ÁȡĿ¼£¬ËûÖ»ÓÐÒ»¸ö²ÎÊý£¬Õâ¸ö²ÎÊýÖ÷opendir·µ»ØµÄ½á¹¹ÌåÖ¸Õ룬»òÕ߽оä±ú¸üÈÝÒ×Àí½âЩ°É¡£Õâ¸öº¯ÊýÒ²·µ»ØÒ»¸ö½á¹¹ÌåÖ¸Õë dirent *
direntµÄ½á¹¹Èç϶¨Òå
                   struct dirent
                   {
                       long d_ino;                      /* inode number */
                       off_t d_off;                     /* offset to this dirent */
                       unsigned short d_reclen;         /* length of this d_name */
                       char d_name [NAME_MAX+1];        /* file name (null-terminated) */
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Table 1. Process mapping
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Linux
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CreateProcess()
CreateProcessAsUser()
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