void seekdir(DIR *dirp, long loc);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
seekdir(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
The seekdir() function sets the location in the directory stream from
which the next readdir(2) call will start. The loc argument should be
a value returned by a previous call to telldir(3).
The seekdir() function returns no value.
Multithreading (see pthreads(7))
The seekdir() function is thread-safe.
In glibc up to version 2.1.1, the type of the loc argument was off_t.
POSIX.1-2001 specifies long, and this is the type used since glibc
2.1.2. See telldir(3) for information on why you should be careful in
making any assumptions about the value in this argument.
lseek(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scan-
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