читать запись в каталоге (read directory entry)
Имя (Name)
readdir - read directory entry
Синопсис (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.
Описание (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superseded by getdents(2).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.
Возвращаемое значение (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.
Ошибки (Error)
EBADF Invalid file descriptor fd.
EFAULT Argument points outside the calling process's address
space.
EINVAL Result buffer is too small.
ENOENT No such directory.
ENOTDIR
File descriptor does not refer to a directory.
Стандарты (Conforming to)
This system call is Linux-specific.
Примечание (Note)
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.
Смотри также (See also)
getdents(2), readdir(3)
