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

    NAME

    realpath - resolve a pathname
     
    

    SYNOPSIS

    #include <stdlib.h>

    char *realpath(const char *restrict file_name,
           char *restrict
    resolved_name);
     

    DESCRIPTION

    The realpath() function shall derive, from the pathname pointed to by file_name, an absolute pathname that names the same file, whose resolution does not involve '.' , '..' , or symbolic links. The generated pathname shall be stored as a null-terminated string, up to a maximum of {PATH_MAX} bytes, in the buffer pointed to by resolved_name.

    If resolved_name is a null pointer, the behavior of realpath() is implementation-defined.  

    RETURN VALUE

    Upon successful completion, realpath() shall return a pointer to the resolved name. Otherwise, realpath() shall return a null pointer and set errno to indicate the error, and the contents of the buffer pointed to by resolved_name are undefined.  

    ERRORS

    The realpath() function shall fail if:

    EACCES
    Read or search permission was denied for a component of file_name.
    EINVAL
    The file_name argument is a null pointer.
    EIO
    An error occurred while reading from the file system.
    ELOOP
    A loop exists in symbolic links encountered during resolution of the path argument.
    ENAMETOOLONG
    The length of the file_name argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.
    ENOENT
    A component of file_name does not name an existing file or file_name points to an empty string.
    ENOTDIR
    A component of the path prefix is not a directory.

    The realpath() function may fail if:

    ELOOP
    More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the path argument.
    ENAMETOOLONG
    Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}.
    ENOMEM
    Insufficient storage space is available.

    The following sections are informative.  

    EXAMPLES

     

    Generating an Absolute Pathname

    The following example generates an absolute pathname for the file identified by the symlinkpath argument. The generated pathname is stored in the actualpath array.

    
    #include <stdlib.h>
    ...
    char *symlinkpath = "/tmp/symlink/file";
    char actualpath [PATH_MAX+1];
    char *ptr;
    
    
    ptr = realpath(symlinkpath, actualpath);
    
    
     

    APPLICATION USAGE

    None.  

    RATIONALE

    Since the maximum pathname length is arbitrary unless {PATH_MAX} is defined, an application generally cannot supply a resolved_name buffer with size {{PATH_MAX}+1}.  

    FUTURE DIRECTIONS

    In the future, passing a null pointer to realpath() for the resolved_name argument may be defined to have realpath() allocate space for the generated pathname.  

    SEE ALSO

    getcwd() , sysconf() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    Generating an Absolute Pathname
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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