#include <sys/dirent.h>

cc = getdirentries(fd, buf, nbytes, basep)
int cc, fd;
char *buf;
int nbytes;
long *basep;

The data in the buffer is a series of dirent structures each containing the following entries:

unsigned long d_fileno;
unsigned short d_reclen;
unsigned short d_namlen;
char d_name[MAXNAMELEN + 1]; /* see below */

The d_fileno entry is a number which is unique for each distinct file in the filesystem. Files that are linked by hard links (see link(2) ) have the same d_fileno . The d_reclen entry is the length, in bytes, of the directory record. The d_name entry contains a null terminated file name. The d_namlen entry specifies the length of the file name excluding the null byte. Thus the actual size of d_name may vary from 1 to MAXNAMELEN + 1.

Entries may be separated by extra space. The d_reclen entry may be used as an offset from the start of a dirent structure to the next structure, if any.

The actual number of bytes transferred is returned. The current position pointer associated with fd is set to point to the next block of entries. The pointer may not advance by the number of bytes returned by getdirentries . A value of zero is returned when the end of the directory has been reached.

Getdirentries writes the position of the block read into the location pointed to by basep . Alternatively, the current position pointer may be set and retrieved by lseek(2) . The current position pointer should only be set to a value returned by lseek(2) , a value returned in the location pointed to by basep , or zero.

15 EBADF fd is not a valid file descriptor open for reading.

15 EFAULT Either buf or basep point outside the allocated address space.

15 EIO An I/O error occurred while reading from or writing to the file system.