Get information about the next matching filename
#include <sys/types.h> #include <dirent.h> int readdir_r( DIR * dirp, struct dirent * entry, struct dirent ** result );
- A pointer to the directory stream to be read.
- A pointer to a dirent structure where the function can store the directory entry.
- The address of a location where the function can store a pointer to the information found.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
If _POSIX_THREAD_SAFE_FUNCTIONS is defined, readdir_r() initializes the dirent structure referenced by entry with the directory entry at the current position in the directory stream referred to by dirp, and stores a pointer to this structure in result.
The storage pointed by entry must be large enough for a dirent structure with the s_name member an array of char containing at least NAME_MAX plus one element.
The struct dirent structure doesn't include space for the pathname; you must provide it. For example:
struct dirent *entry; entry = malloc( offsetof(struct dirent, d_name) + NAME_MAX + 1 );
Some filesystems support names that are longer than the value of NAME_MAX. You can use pathconf() with _PC_NAME_MAX to determine the maximum number of bytes (not including the terminating null) allowed in a file name for a particular filesystem.
- The dirp argument doesn't refer to an open directory stream.
- One of the values in the structure to be returned can't be represented correctly.
Last modified: 2013-12-23