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DIR *opendir(const char *name);
DIR *fdopendir(int fd);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
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 fdopendir() function is like opendir(), but returns a directory
stream for the directory referred to by the open file descriptor fd.
After a successful call to fdopendir(), fd is used internally by the
implementation, and should not otherwise be used by the application.
The opendir() and fdopendir() functions return a pointer to the direc-
tory stream. On error, NULL is returned, and errno is set appropri-
EACCES Permission denied.
EBADF fd is not a valid file descriptor opened for reading.
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.
fdopendir() is available in glibc since version 2.4.
opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001.
fdopendir() is specified in POSIX.1-2008.
GNU 2010-06-20 OPENDIR(3)