table of contents
|READLINK(2)||System Calls Manual||READLINK(2)|
readlinkat — read value of a
Standard C Library (libc, -lc)
char *restrict path, char
*restrict buf, size_t
const char *restrict path, char
*restrict buf, size_t bufsize);
system call places the contents of the symbolic link
path in the buffer buf, which
has size bufsiz. The
readlink() system call does not append a
NUL character to buf.
system call is equivalent to
readlink() except in
the case where path specifies a relative path. In this
case the symbolic link whose content is read relative to the directory
associated with the file descriptor fd instead of the
current working directory. If
readlinkat() is passed
the special value
AT_FDCWD in the
fd parameter, the current working directory is used
and the behavior is identical to a call to
The call returns the count of characters placed in the buffer if it succeeds, or a -1 if an error occurs, placing the error code in the global variable errno.
readlink() system call will fail
- A component of the path prefix is not a directory.
- A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
- The named file does not exist.
- Search permission is denied for a component of the path prefix.
- Too many symbolic links were encountered in translating the pathname.
- The named file is not a symbolic link.
- An I/O error occurred while reading from the file system.
- Corrupted data was detected while reading from the file system.
- The buf argument extends outside the process's allocated address space.
In addition to the errors returned by the
may fail if:
readlinkat() system call follows The
Open Group Extended API Set 2 specification.
readlink() system call appeared in
system call appeared in FreeBSD 8.0.
|March 30, 2020||Debian|