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28 .\" @(#)directory.3 8.1 (Berkeley) 6/4/93
44 .Nd directory operations
51 .Fn opendir "const char *filename"
53 .Fn fdopendir "int fd"
55 .Fn readdir "DIR *dirp"
57 .Fn readdir_r "DIR *dirp" "struct dirent *entry" "struct dirent **result"
59 .Fn telldir "DIR *dirp"
61 .Fn seekdir "DIR *dirp" "long loc"
63 .Fn rewinddir "DIR *dirp"
65 .Fn closedir "DIR *dirp"
72 opens the directory named by
78 returns a pointer to be used to identify the
80 in subsequent operations.
85 cannot be accessed, or if it cannot
87 enough memory to hold the whole thing.
91 function is equivalent to the
93 function except that the directory is specified by a file descriptor
95 rather than by a name.
96 The file offset associated with the file descriptor at the time of the call
97 determines which entries are returned.
99 Upon successful return from
101 the file descriptor is under the control of the system,
102 and if any attempt is made to close the file descriptor,
103 or to modify the state of the associated description other than by means
110 the behavior is undefined.
113 the file descriptor is closed.
116 flag is set on the file descriptor by a successful call to
122 returns a pointer to the next directory entry.
125 upon reaching the end of the directory or detecting an invalid
132 provides the same functionality as
134 but the caller must provide a directory
136 buffer to store the results in.
137 If the read succeeds,
141 upon reaching the end of the directory
148 returns 0 on success or an error number to indicate failure.
153 returns the current location associated with the named
154 .Em directory stream .
157 are good only for the lifetime of the
161 from which they are derived.
162 If the directory is closed and then
163 reopened, prior values returned by
165 will no longer be valid.
170 sets the position of the next
173 .Em directory stream .
174 The new position reverts to the one associated with the
178 operation was performed.
183 resets the position of the named
185 to the beginning of the directory.
192 and frees the structure associated with the
195 returning 0 on success.
196 On failure, \-1 is returned and the global variable
198 is set to indicate the error.
203 returns the integer file descriptor associated with the named
204 .Em directory stream ,
208 Sample code which searches a directory for entry ``name'' is:
209 .Bd -literal -offset indent
212 while ((dp = readdir(dirp)) != NULL)
213 if (dp->d_namlen == len && !strcmp(dp->d_name, name)) {
214 (void)closedir(dirp);
217 (void)closedir(dirp);
236 functions appeared in