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

NAME
       query_module - query the kernel for various bits pertaining to modules
SYNOPSIS
       #include <linux/module.h>
       int query_module(const char *name, int which, void *buf,
                        size_t bufsize, size_t *ret);
       Note: There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
       Note: This system call is present only in kernels before Linux 2.6.
       query_module() requests information from the kernel about loadable mod-
       ules.  The returned information is placed in the buffer pointed  to  by
       buf.   The caller must specify the size of buf in bufsize.  The precise
       nature and format of the returned information depend on  the  operation
       specified  by  which.   Some operations require name to identify a cur-
       rently loaded module, some allow name to be NULL, indicating the kernel
       proper.
       The following values can be specified for which:
       0      Returns success, if the kernel supports query_module().  Used to
              probe for availability of the system call.
       QM_MODULES
              Returns the names of all loaded modules.   The  returned  buffer
              consists of a sequence of null-terminated strings; ret is set to
              the number of modules.
       QM_DEPS
              Returns the names of all modules used by the  indicated  module.
              The  returned  buffer  consists of a sequence of null-terminated
              strings; ret is set to the number of modules.
       QM_REFS
              Returns the names of all modules  using  the  indicated  module.
              This is the inverse of QM_DEPS.  The returned buffer consists of
              a sequence of null-terminated strings; ret is set to the  number
              of modules.
       QM_SYMBOLS
              Returns  the  symbols  and  values exported by the kernel or the
              indicated module.  The returned buffer is an array of structures
              of the following form
                  struct module_symbol {
                      unsigned long value;
                      unsigned long name;
                  };
              followed  by  null-terminated strings.  The value of name is the
              character offset of the string relative to the start of buf; ret
              is set to the number of symbols.
       QM_INFO
              Returns  miscellaneous  information  about the indicated module.
              The output buffer format is:
                  struct module_info {
                      unsigned long address;
                      unsigned long size;
                      unsigned long flags;
                  };
              where address is the kernel address at which the module resides,
              size  is the size of the module in bytes, and flags is a mask of
              MOD_RUNNING, MOD_AUTOCLEAN, etc.,  that  indicates  the  current
              status   of  the  module  (see  the  Linux  kernel  source  file
              include/linux/module.h).  ret is set to the  size  of  the  mod-
              ule_info structure.
RETURN VALUE
       On  success,  zero  is returned.  On error, -1 is returned and errno is
       set appropriately.
ERRORS
       EFAULT At least one of name, buf, or  ret  was  outside  the  program's
              accessible address space.
       EINVAL Invalid  which;  or  name is NULL (indicating "the kernel"), but
              this is not permitted with the specified value of which.
       ENOENT No module by that name exists.
       ENOSPC The buffer size provided was too small.  ret is set to the mini-
              mum size needed.
       ENOSYS query_module()  is  not  supported in this version of the kernel
              (e.g., the kernel is version 2.6 or later).
VERSIONS
       This system call is present on Linux only up until kernel 2.4;  it  was
       removed in Linux 2.6.
CONFORMING TO
       query_module() is Linux-specific.
NOTES
       Some  of the information that was formerly available via query_module()
       can be obtained from /proc/modules, /proc/kallsyms, and the files under
       the directory /sys/module.
       Glibc  does not provide a wrapper for this system call; in the unlikely
       event that you need to use it on an old kernel, use syscall(2).
SEE ALSO
       create_module(2), delete_module(2), get_kernel_syms(2), init_module(2),
       lsmod(8), modinfo(8)
COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux                             2013-01-27                   QUERY_MODULE(2)