1OPENDIR(3) Linux Programmer's Manual OPENDIR(3)
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6 opendir, fdopendir - open a directory
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9 #include <sys/types.h>
10 #include <dirent.h>
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12 DIR *opendir(const char *name);
13 DIR *fdopendir(int fd);
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15 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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17 fdopendir():
18 Since glibc 2.10:
19 _POSIX_C_SOURCE >= 200809L
20 Before glibc 2.10:
21 _GNU_SOURCE
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24 The opendir() function opens a directory stream corresponding to the
25 directory name, and returns a pointer to the directory stream. The
26 stream is positioned at the first entry in the directory.
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28 The fdopendir() function is like opendir(), but returns a directory
29 stream for the directory referred to by the open file descriptor fd.
30 After a successful call to fdopendir(), fd is used internally by the
31 implementation, and should not otherwise be used by the application.
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34 The opendir() and fdopendir() functions return a pointer to the direc‐
35 tory stream. On error, NULL is returned, and errno is set appropri‐
36 ately.
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39 EACCES Permission denied.
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41 EBADF fd is not a valid file descriptor opened for reading.
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43 EMFILE The per-process limit on the number of open file descriptors has
44 been reached.
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46 ENFILE The system-wide limit on the total number of open files has been
47 reached.
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49 ENOENT Directory does not exist, or name is an empty string.
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51 ENOMEM Insufficient memory to complete the operation.
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53 ENOTDIR
54 name is not a directory.
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57 fdopendir() is available in glibc since version 2.4.
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60 For an explanation of the terms used in this section, see
61 attributes(7).
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63 ┌───────────────────────┬───────────────┬─────────┐
64 │Interface │ Attribute │ Value │
65 ├───────────────────────┼───────────────┼─────────┤
66 │opendir(), fdopendir() │ Thread safety │ MT-Safe │
67 └───────────────────────┴───────────────┴─────────┘
69 opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001.
70 fdopendir() is specified in POSIX.1-2008.
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73 Filename entries can be read from a directory stream using readdir(3).
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75 The underlying file descriptor of the directory stream can be obtained
76 using dirfd(3).
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78 The opendir() function sets the close-on-exec flag for the file
79 descriptor underlying the DIR *. The fdopendir() function leaves the
80 setting of the close-on-exec flag unchanged for the file descriptor,
81 fd. POSIX.1-200x leaves it unspecified whether a successful call to
82 fdopendir() will set the close-on-exec flag for the file descriptor,
83 fd.
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86 open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3),
87 seekdir(3), telldir(3)
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90 This page is part of release 5.04 of the Linux man-pages project. A
91 description of the project, information about reporting bugs, and the
92 latest version of this page, can be found at
93 https://www.kernel.org/doc/man-pages/.
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97GNU 2017-09-15 OPENDIR(3)