struct dirent中的d_name的长度问题

时间：2009-03-26 来源：typhoon85

　　在看有关目录操作的问题时，为什么在AIX中的dirent.h中定义的　struct dirent,数组d_name[255]的长度是255,而在sun下面确是d_name[1]

我从linux的/usr/include/bits/dirent.h中找到的

struct dirent
  {
#ifndef __USE_FILE_OFFSET64
__ino_t d_ino;
__off_t d_off;
#else
__ino64_t d_ino;
__off64_t d_off;
#endif
unsigned short int d_reclen;
unsigned char d_type;
char d_name[256];          /* We must not include limits.h! */
  };

#ifdef __USE_LARGEFILE64
struct dirent64
  {
__ino64_t d_ino;
__off64_t d_off;
unsigned short int d_reclen;
unsigned char d_type;
char d_name[256];          /* We must not include limits.h! */
  };
#endif

我在AIX 下看到的定义如下：

#define _D_NAME_MAX 255

struct  dirent {
      __ulong64_t    d_offset;    /* real off after this entry */
      ino_t          d_ino;       /* inode number of entry */
      ushort_t       d_reclen;    /* length of this record */
      ushort_t       d_namlen;    /* length of string in d_name */
      char          d_name[_D_NAME_MAX+1];  /* name must be no longer than t
                                    /* redefine w/#define when name decided
};

而在sunOS下面看到的是

typedef struct dirent {
      ino_t          d_ino;       /* "inode number" of entry */
      off_t          d_off;       /* offset of disk directory entry */
      unsigned short  d_reclen;    /* length of this record */
      char          d_name[1];    /* name of file */
} dirent_t;

2008-2-28 19:46cugb_cat

man readdir
   On Linux, the dirent structure is defined as follows:

      struct dirent {
            ino_t       d_ino;    /* inode number */
            off_t       d_off;    /* offset to the next dirent */
            unsigned short d_reclen; /* length of this record */
            unsigned char  d_type;    /* type of file */
            char          d_name[256]; /* filename */
      };

相关阅读更多 +