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> lstat(2)
> readlinkat(2)
> stat(2)
> symlink(2)
> path_resolution(7)
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man page of readlink

readlink: read value of a symbolic link


readlink - read value of a symbolic link


#include <unistd.h> 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 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _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 pathname. ENAMETOOLONG A pathname, or a component of a pathname, was too long. ENOENT The named file does not exist. ENOMEM Insufficient kernel memory was available. ENOTDIR A component of the path prefix is not a directory.


4.4BSD (readlink() first 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), symlink(7)
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at //www.kernel.org/doc/man-pages/. READLINK(2)

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