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dirfd(3c)
Standard C Library Functions dirfd(3C)
NAME
dirfd - get directory stream file descriptor
SYNOPSIS
#include <dirent.h>
int dirfd(DIR *dir);
DESCRIPTION
The dirfd() function returns the file descriptor associated with the
directory stream dir.
This file descriptor is the one used internally by the directory stream
operations. See opendir(3C), closedir(3C), readdir(3C), rewinddir(3C),
seekdir(3C), telldir(3C). The file descriptor is automatically closed
when closedir() is called for the directory stream dir or when one of
the exec functions is called. See exec(2).
The file descriptor can safely be used only by functions that do not
depend on or alter the file position, such as fstat(2) and fchdir(2).
Closing the file descriptor with close(2) or modifying the file posi‐
tion by means other than the directory stream operations listed above
causes undefined behavior to occur when one of the directory stream
operations is subsequently called with the directory stream dir.
RETURN VALUES
Upon successful completion, the dirfd() function returns an open file
descriptor for the directory associated with the directory stream dir.
ERRORS
There are no defined error returns. Passing an invalid directory stream
as an argument to the dirfd() function results in undefined behavior.
USAGE
The dirfd() function is intended to be used to obtain a file descriptor
for use with the fchdir() function.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSafe
SEE ALSO
close(2), exec(2), fchdir(2), fstat(2), closedir(3C), opendir(3C),
readdir(3C), rewinddir(3C), seekdir(3C), telldir(3C), attributes(7)
Oracle Solaris 11.4 24 Oct 2007 dirfd(3C)