READLINK(2) Linux Programmer's Manual READLINK(2)
readlink - read value of a symbolic link
ssize_t readlink(const char *path, char *buf, size_t bufsiz);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
readlink(): _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
_POSIX_C_SOURCE >= 200112L
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.
On success, readlink() returns the number of bytes placed in buf. On
error, -1 is returned and errno is set to indicate the error.
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), sym-
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Linux 2007-07-26 READLINK(2)