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readlinkat() - Unix, Linux System Call
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NAME
readlinkat - read value of a symbolic link relative to a directory file descriptor
SYNOPSIS
#include <unistd.h>
int readlinkat(int dirfd, const char *path
", char *" buf ", size_t " bufsiz );
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DESCRIPTION
The
readlinkat() system call operates in exactly the same way as
readlink(2),
except for the differences described in this manual page.
If the pathname given in
path is relative, then it is interpreted relative to the directory
referred to by the file descriptor
dirfd (rather than relative to the current working directory of
the calling process, as is done by
readlink(2)
for a relative pathname).
If the pathname given in
path is relative and
dirfd is the special value
AT_FDCWD, then
path is interpreted relative to the current working
directory of the calling process (like
readlink(2)).
If the pathname given in
path is absolute, then
dirfd is ignored.
RETURN VALUE
On success,
readlinkat() returns 0.
On error, -1 is returned and
errno is set to indicate the error.
ERRORS
The same errors that occur for
readlink(2)
can also occur for
readlinkat(). The following additional errors can occur for
readlinkat():
Tag | Description |
EBADF |
dirfd is not a valid file descriptor.
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ENOTDIR | |
path is a relative path and
dirfd is a file descriptor referring to a file other than a directory.
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NOTES
See
openat(2)
for an explanation of the need for
readlinkat(). CONFORMING TO
This system call is non-standard but is proposed
for inclusion in a future revision of POSIX.1.
VERSIONS
readlinkat() was added to Linux in kernel 2.6.16.
SEE ALSO
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