вернуть путь к записи каталога (return a directory entry's path)
Имя (Name)
lookup_dcookie - return a directory entry's path
Синопсис (Synopsis)
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(SYS_lookup_dcookie, uint64_t cookie, char *buffer,
size_t len);
Note: glibc provides no wrapper for lookup_dcookie(),
necessitating the use of syscall(2).
Описание (Description)
Look up the full path of the directory entry specified by the
value cookie. The cookie is an opaque identifier uniquely
identifying a particular directory entry. The buffer given is
filled in with the full path of the directory entry.
For lookup_dcookie() to return successfully, the kernel must
still hold a cookie reference to the directory entry.
Возвращаемое значение (Return value)
On success, lookup_dcookie() returns the length of the path
string copied into the buffer. On error, -1 is returned, and
errno is set to indicate the error.
Ошибки (Error)
EFAULT The buffer was not valid.
EINVAL The kernel has no registered cookie/directory entry
mappings at the time of lookup, or the cookie does not
refer to a valid directory entry.
ENAMETOOLONG
The name could not fit in the buffer.
ENOMEM The kernel could not allocate memory for the temporary
buffer holding the path.
EPERM The process does not have the capability CAP_SYS_ADMIN
required to look up cookie values.
ERANGE The buffer was not large enough to hold the path of the
directory entry.
Версии (Versions)
Available since Linux 2.5.43. The ENAMETOOLONG error return was
added in 2.5.70.
Стандарты (Conforming to)
lookup_dcookie() is Linux-specific.
Примечание (Note)
lookup_dcookie() is a special-purpose system call, currently used
only by the oprofile(1) profiler. It relies on a kernel driver
to register cookies for directory entries.
The path returned may be suffixed by the string " (deleted)" if
the directory entry has been removed.
Смотри также (See also)
oprofile(1)
