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READLINK(2)                Linux Programmer's Manual               READLINK(2)



NAME
       readlink - read value of a symbolic link

SYNOPSIS
       #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 || _POSIX_C_SOURCE >= 200112L

DESCRIPTION
       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.

RETURN VALUE
       On success, readlink() returns the number of bytes placed in buf.  On error, -1  is
       returned and errno is set to indicate the error.

ERRORS
       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.

CONFORMING TO
       4.4BSD (the readlink() function call appeared in 4.2BSD), POSIX.1-2001.

NOTES
       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.

SEE ALSO
       lstat(2), readlinkat(2), stat(2), symlink(2), path_resolution(7), symlink(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2007-07-26                       READLINK(2)

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