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readlink - read value of a symbolic link
Standard C Library (libc, -lc)
readlink(const char *path, char *buf, int bufsiz);
The readlink() 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.
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.
The readlink() system call will fail if:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or
an entire path name exceeded 1023 characters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the
[ELOOP] Too many symbolic links were encountered in
translating the pathname.
[EINVAL] The named file is not a symbolic link.
[EIO] An I/O error occurred while reading from the file
[EFAULT] The buf argument extends outside the process’s
allocated address space.
lstat(2), stat(2), symlink(2), symlink(7)
The readlink() system call appeared in 4.2BSD.