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readlink - read value of a symbolic link
ssize_t readlink(const char *path, char *buf, size_t bufsiz);
readlink() places the contents of the symbolic link path in the buffer
buf, which has size bufsiz. readlink() does not append a null byte to
buf. It will truncate the contents (to a length of bufsiz characters),
in case the buffer is too small to hold all of the contents.
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 errno.
EACCES Search permission is denied for a component of the path prefix.
(See also path_resolution(7).)
EFAULT buf extends outside the process’s allocated address space.
EINVAL bufsiz is not positive.
EINVAL The named file is not a symbolic link.
EIO An I/O error occurred while reading from the file system.
ELOOP Too many symbolic links were encountered in translating the
A pathname, or a component of a pathname, was too long.
ENOENT The named file does not exist.
ENOMEM Insufficient kernel memory was available.
A component of the path prefix is not a directory.
4.4BSD (the readlink() function call appeared in 4.2BSD), POSIX.1-2001.
In versions of glibc up to and including glibc 2.4, the return type of
readlink() was declared as int. Nowadays, the return type is declared
as ssize_t, as (newly) required in POSIX.1-2001.
lstat(2), readlinkat(2), stat(2), symlink(2), path_resolution(7)