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    Command:

    delete_module

    
    
    

    SYNOPSIS

           int delete_module(const char *name, int flags);
    
           Note: There is no glibc wrapper for this system call; see NOTES.
    
    
    

    DESCRIPTION

           The  delete_module() system call attempts to remove the unused loadable
           module entry identified by name.  If the module has an  exit  function,
           then  that function is executed before unloading the module.  The flags
           argument is used  to  modify  the  behavior  of  the  system  call,  as
           described below.  This system call requires privilege.
    
           Module removal is attempted according to the following rules:
    
           1.  If  there  are  other loaded modules that depend on (i.e., refer to
               symbols defined in) this module, then the call fails.
    
           2.  Otherwise, if the reference count for the module (i.e., the  number
               of  processes  currently using the module) is zero, then the module
               is immediately unloaded.
    
           3.  If a module has  a  nonzero  reference  count,  then  the  behavior
               depends on the bits set in flags.  In normal usage (see NOTES), the
               O_NONBLOCK flag is always specified, and the O_TRUNC flag may addi-
               tionally be specified.
    
               The various combinations for flags have the following effect:
    
               flags == O_NONBLOCK
                      The call returns immediately, with an error.
    
               flags == (O_NONBLOCK | O_TRUNC)
                      The module is unloaded immediately, regardless of whether it
                      has a nonzero reference count.
    
               (flags & O_NONBLOCK) == 0
                      If flags does not specify O_NONBLOCK,  the  following  steps
                      occur:
    
                      *  The  module  is marked so that no new references are per-
                         mitted.
    
                      *  If the module's reference count is nonzero, the caller is
                         placed  in  an uninterruptible sleep state (TASK_UNINTER-
                         RUPTIBLE) until the reference count  is  zero,  at  which
                         point the call unblocks.
    
                      *  The module is unloaded in the usual way.
    
           The  O_TRUNC  flag has one further effect on the rules described above.
           By default, if a module has an init function but no exit function, then
           an  attempt  to  remove  the module will fail.  However, if O_TRUNC was
                  tion but has no exit function, and O_TRUNC was not specified  in
                  flags.
    
           EFAULT name  refers  to  a  location  outside  the process's accessible
                  address space.
    
           ENOENT No module by that name exists.
    
           EPERM  The caller was not privileged (did not have  the  CAP_SYS_MODULE
                  capability), or module unloading is disabled (see /proc/sys/ker-
                  nel/modules_disabled in proc(5)).
    
           EWOULDBLOCK
                  Other modules depend on this module; or, O_NONBLOCK  was  speci-
                  fied in flags, but the reference count of this module is nonzero
                  and O_TRUNC was not specified in flags.
    
    
    

    CONFORMING TO

           delete_module() is Linux-specific.
    
    
    

    NOTES

           Glibc does not provide a wrapper for this system call;  call  it  using
           syscall(2).
    
           The  uninterruptible sleep that may occur if O_NONBLOCK is omitted from
           flags is considered undesirable, because the sleeping process  is  left
           in  an  unkillable  state.   As  at Linux 3.7, specifying O_NONBLOCK is
           optional, but in future kernels it is likely to become mandatory.
    
       Linux 2.4 and earlier
           In Linux 2.4 and earlier, the system call took only one argument:
    
              int delete_module(const char *name);
    
           If name is NULL, all unused modules marked auto-clean are removed.
    
           Some further details of differences in the behavior of  delete_module()
           in  Linux  2.4  and  earlier are not currently explained in this manual
           page.
    
    
    

    SEE ALSO

           create_module(2),  init_module(2),  query_module(2),   lsmod(8),   mod-
           probe(8), rmmod(8)
    
    
    

    Linux 2012-11-08 DELETE_MODULE(2)

    
    
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