table of contents
readdir(2) | System Calls Manual | readdir(2) |
NAME¶
readdir - read directory entry
LIBRARY¶
Standard C library (libc, -lc)
SYNOPSIS¶
#include <sys/syscall.h> /* Definition of SYS_* constants */ #include <unistd.h>
int syscall(SYS_readdir, unsigned int fd, struct old_linux_dirent *dirp, unsigned int count);
Note: There is no definition of struct old_linux_dirent; see NOTES.
DESCRIPTION¶
This is not the function you are interested in. Look at readdir(3) for the POSIX conforming C library interface. This page documents the bare kernel system call interface, which is superseded by getdents(2).
readdir() reads one old_linux_dirent structure from the directory referred to by the file descriptor fd into the buffer pointed to by dirp. The argument count is ignored; at most one old_linux_dirent structure is read.
The old_linux_dirent structure is declared (privately in Linux kernel file fs/readdir.c) as follows:
struct old_linux_dirent {
unsigned long d_ino; /* inode number */
unsigned long d_offset; /* offset to this old_linux_dirent */
unsigned short d_namlen; /* length of this d_name */
char d_name[1]; /* filename (null-terminated) */ }
d_ino is an inode number. d_offset is the distance from the start of the directory to this old_linux_dirent. d_reclen is the size of d_name, not counting the terminating null byte ('\0'). d_name is a null-terminated filename.
RETURN VALUE¶
On success, 1 is returned. On end of directory, 0 is returned. On error, -1 is returned, and errno is set to indicate the error.
ERRORS¶
VERSIONS¶
You will need to define the old_linux_dirent structure yourself. However, probably you should use readdir(3) instead.
This system call does not exist on x86-64.
STANDARDS¶
Linux.
SEE ALSO¶
2024-06-15 | Linux man-pages 6.9.1 |