1<dirent.h>(0P) POSIX Programmer's Manual <dirent.h>(0P)
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6 dirent.h - format of directory entries
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9 #include <dirent.h>
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12 The internal format of directories is unspecified.
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14 The <dirent.h> header shall define the following type:
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16 DIR A type representing a directory stream.
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19 It shall also define the structure dirent which shall include the fol‐
20 lowing members:
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23 ino_t d_ino File serial number.
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25 char d_name[] Name of entry.
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27 The type ino_t shall be defined as described in <sys/types.h> .
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29 The character array d_name is of unspecified size, but the number of
30 bytes preceding the terminating null byte shall not exceed {NAME_MAX}.
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32 The following shall be declared as functions and may also be defined as
33 macros. Function prototypes shall be provided.
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36 int closedir(DIR *);
37 DIR *opendir(const char *);
38 struct dirent *readdir(DIR *);
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40 int readdir_r(DIR *restrict, struct dirent *restrict,
41 struct dirent **restrict);
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43 void rewinddir(DIR *);
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45 void seekdir(DIR *, long);
46 long telldir(DIR *);
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49 The following sections are informative.
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52 None.
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55 Information similar to that in the <dirent.h> header is contained in a
56 file <sys/dir.h> in 4.2 BSD and 4.3 BSD. The equivalent in these imple‐
57 mentations of struct dirent from this volume of IEEE Std 1003.1-2001 is
58 struct direct. The filename was changed because the name <sys/dir.h>
59 was also used in earlier implementations to refer to definitions
60 related to the older access method; this produced name conflicts. The
61 name of the structure was changed because this volume of
62 IEEE Std 1003.1-2001 does not completely define what is in the struc‐
63 ture, so it could be different on some implementations from struct
64 direct.
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66 The name of an array of char of an unspecified size should not be used
67 as an lvalue. Use of:
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70 sizeof(d_name)
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72 is incorrect; use:
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75 strlen(d_name)
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77 instead.
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79 The array of char d_name is not a fixed size. Implementations may need
80 to declare struct dirent with an array size for d_name of 1, but the
81 actual number of characters provided matches (or only slightly exceeds)
82 the length of the filename.
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85 None.
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88 <sys/types.h>, the System Interfaces volume of IEEE Std 1003.1-2001,
89 closedir(), opendir(), readdir(), readdir_r(), rewinddir(), seekdir(),
90 telldir()
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93 Portions of this text are reprinted and reproduced in electronic form
94 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
95 -- Portable Operating System Interface (POSIX), The Open Group Base
96 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
97 Electrical and Electronics Engineers, Inc and The Open Group. In the
98 event of any discrepancy between this version and the original IEEE and
99 The Open Group Standard, the original IEEE and The Open Group Standard
100 is the referee document. The original Standard can be obtained online
101 at http://www.opengroup.org/unix/online.html .
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105IEEE/The Open Group 2003 <dirent.h>(0P)