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readlink(2)
readlink(2) System Calls readlink(2)
NAME
readlink, readlinkat - read the contents of a symbolic link
SYNOPSIS
#include <unistd.h>
ssize_t readlink(const char *restrict path, char *restrict buf,
size_t bufsiz);
ssize_t readlinkat(int fd, const char *restrict path,
char *restrict buf, size_t bufsiz);
DESCRIPTION
The readlink() function places the contents of the symbolic link re‐
ferred to by path in the buffer buf which has size bufsiz. If the num‐
ber of bytes in the symbolic link is less than bufsiz, the contents of
the remainder of buf are left unchanged. If the buf argument is not
large enough to contain the link content, the first bufsiz bytes are
placed in buf.
Upon successful completion, readlink() marks for update the last data
access timestamp of the symbolic link.
The readlinkat() function is equivalent to the readlink() function ex‐
cept in the case where path specifies a relative path. In this case the
symbolic link whose content is read is relative to the directory asso‐
ciated with the file descriptor fd instead of the current working di‐
rectory. If the file descriptor was opened without O_SEARCH, the func‐
tion checks whether directory searches are permitted using the current
permissions of the directory underlying the file descriptor. If the
file descriptor was opened with O_SEARCH, the function does not perform
the check.
If readlinkat() is passed the special value AT_FDCWD in the fd parame‐
ter, the current working directory is used and the behavior is identi‐
cal to a call to readlink().
RETURN VALUES
Upon successful completion, readlink() and readlinkat() return the
count of bytes placed in the buffer. Otherwise, it returns −1, leaves
the buffer unchanged, and sets errno to indicate the error.
ERRORS
The readlink() and readlinkat() functions will fail if:
EACCES Search permission is denied for a component of the path
prefix of path.
EFAULT path or buf points to an illegal address.
EINVAL The path argument names a file that is not a symbolic
link.
EIO An I/O error occurred while reading from the file sys‐
tem.
ENOENT A component of path does not name an existing file or
path is an empty string.
ELOOP A loop exists in symbolic links encountered during res‐
olution of the path argument.
ENAMETOOLONG The length of path exceeds {PATH_MAX}, or a pathname
component is longer than {NAME_MAX} while
_POSIX_NO_TRUNC is in effect.
ENOTDIR A component of the path prefix is not a directory.
ENOSYS The file system does not support symbolic links.
The readlinkat() function will fail if:
EACCES fd was not opened with O_SEARCH and the permissions of the
directory underlying fd do not permit directory searches.
EBADF The path argument does not specify an absolute path and the
fd argument is neither AT_FDCWD nor a valid file descriptor
open for reading or searching.
The readlink() and readlinkat() functions may fail if:
EACCES Read permission is denied for the directory.
ELOOP More than {SYMLOOP_MAX} symbolic links were encountered
in resolving path.
ENAMETOOLONG As a result of encountering a symbolic link in resolu‐
tion of the path argument, the length of the substi‐
tuted pathname string exceeded {PATH_MAX}.
The readlinkat() function may fail if:
ENOTDIR The path argument is not an absolute path and fd is neither
AT_FDCWD nor a file descriptor associated with a directory.
USAGE
Portable applications should not assume that the returned contents of
the symbolic link are null-terminated.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelAsync-Signal-
Safe _ StandardSee standards(7).
SEE ALSO
readlink(1), resolvepath(2), stat(2), symlink(2), realpath(3C), attrib‐
utes(7), standards(7)
HISTORY
The readlinkat() function was added to Solaris in the Solaris 11.0 re‐
lease.
The readlink() function has been included in all Sun and Oracle re‐
leases of Solaris.
Oracle Solaris 11.4 30 Jan 2023 readlink(2)