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readlink (2)
  • readlink (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • readlink (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • readlink (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • readlink (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • >> readlink (2) ( Solaris man: Системные вызовы )
  • readlink (2) ( FreeBSD man: Системные вызовы )
  • readlink (2) ( Русские man: Системные вызовы )
  • readlink (2) ( Linux man: Системные вызовы )
  • readlink (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    readlink - read the contents of a symbolic link
     
    

    SYNOPSIS

    #include <unistd.h>
    
    ssize_t readlink(const char *restrict path,
        char *restrict buf, size_t bufsiz);
    

     

    DESCRIPTION

    The readlink() function places the contents of the symbolic link referred to by path in the buffer buf which has size bufsiz. If the number of bytes in the symbolic link is less than bufsiz, the contents of the remainder of buf are left unchanged. If the buf argument is not large enough to contain the link content, the first bufsize bytes are placed in buf.  

    RETURN VALUES

    Upon successful completion, readlink() returns the count of bytes placed in the buffer. Otherwise, it returns -1, leaves the buffer unchanged, and sets errno to indicate the error.  

    ERRORS

    The readlink() function will fail if:

    EACCES

    Search permission is denied for a component of the path prefix of path.

    EFAULT

    path or buf points to an illegal address.

    EINVAL

    The path argument names a file that is not a symbolic link.

    EIO

    An I/O error occurred while reading from the file system.

    ENOENT

    A component of path does not name an existing file or path is an empty string.

    ELOOP

    A loop exists in symbolic links encountered during resolution of the path argument.

    ENAMETOOLONG

    The length of path exceeds {PATH_MAX}, or a pathname component is longer than {NAME_MAX} while _POSIX_NO_TRUNC is in effect.

    ENOTDIR

    A component of the path prefix is not a directory.

    ENOSYS

    The file system does not support symbolic links.

    The readlink() function may fail if:

    EACCES

    Read permission is denied for the directory.

    ELOOP

    More than {SYMLOOP_MAX} symbolic links were encountered in resolving path.

    ENAMETOOLONG

    As a result of encountering a symbolic link in resolution of the path argument, the length of the substituted pathname string exceeded {PATH_MAX}.

     

    USAGE

    Portable applications should not assume that the returned contents of the symbolic link are null-terminated.  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    stat(2), symlink(2), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    USAGE
    ATTRIBUTES
    SEE ALSO


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