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chroot (2)
  • chroot (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • chroot (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • chroot (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • chroot (2) ( Solaris man: Системные вызовы )
  • >> chroot (2) ( FreeBSD man: Системные вызовы )
  • chroot (2) ( Русские man: Системные вызовы )
  • chroot (2) ( Linux man: Системные вызовы )
  • chroot (8) ( FreeBSD man: Команды системного администрирования )
  • chroot (8) ( Linux man: Команды системного администрирования )
  • Ключ chroot обнаружен в базе ключевых слов.

  • BSD mandoc
     

    NAME

    
    
    chroot
    
     - change root directory
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <unistd.h>
    int chroot (const char *dirname);
     

    DESCRIPTION

    The Fa dirname argument is the address of the pathname of a directory, terminated by an ASCII NUL. The chroot ();
    system call causes Fa dirname to become the root directory, that is, the starting point for path searches of pathnames beginning with `/'

    In order for a directory to become the root directory a process must have execute (search) access for that directory.

    It should be noted that chroot ();
    has no effect on the process's current directory.

    This call is restricted to the super-user.

    Depending on the setting of the `kern.chroot_allow_open_directories' sysctl variable, open filedescriptors which reference directories will make the chroot ();
    fail as follows:

    If `kern.chroot_allow_open_directories' is set to zero, chroot ();
    will always fail with Er EPERM if there are any directories open.

    If `kern.chroot_allow_open_directories' is set to one (the default), chroot ();
    will fail with Er EPERM if there are any directories open and the process is already subject to the chroot ();
    system call.

    Any other value for `kern.chroot_allow_open_directories' will bypass the check for open directories

    Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate an error.  

    ERRORS

    The chroot ();
    system call will fail and the root directory will be unchanged if:

    Bq Er ENOTDIR
    A component of the path name is not a directory.
    Bq Er EPERM
    The effective user ID is not the super-user, or one or more filedescriptors are open directories.
    Bq Er ENAMETOOLONG
    A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
    Bq Er ENOENT
    The named directory does not exist.
    Bq Er EACCES
    Search permission is denied for any component of the path name.
    Bq Er ELOOP
    Too many symbolic links were encountered in translating the pathname.
    Bq Er EFAULT
    The Fa dirname argument points outside the process's allocated address space.
    Bq Er EIO
    An I/O error occurred while reading from or writing to the file system.

     

    SEE ALSO

    chdir(2), jail(2)  

    HISTORY

    The chroot ();
    system call appeared in BSD 4.2  

    BUGS

    If the process is able to change its working directory to the target directory, but another access control check fails (such as a check for open directories, or a MAC check), it is possible that this system call may return an error, with the working directory of the process left changed.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    ERRORS
    SEE ALSO
    HISTORY
    BUGS


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