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OPENDIR(3) Linux Programmer's Manual OPENDIR(3)
opendir - open a directory
DIR *opendir(const char *name);
The opendir() function opens a directory stream corresponding to the
directory name, and returns a pointer to the directory stream. The
stream is positioned at the first entry in the directory.
The opendir() function returns a pointer to the directory stream. On
error, NULL is returned, and errno is set appropriately.
EACCES Permission denied.
EMFILE Too many file descriptors in use by process.
ENFILE Too many files are currently open in the system.
ENOENT Directory does not exist, or name is an empty string.
ENOMEM Insufficient memory to complete the operation.
name is not a directory.
The underlying file descriptor of the directory stream can be obtained
SVr4, 4.3BSD, POSIX.1-2001.
open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3),
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