Read data of a page frame (linux) make freeze the system
Hello,
I'm writing a linux driver that reading the data of a page frame of an process. But when I use it, it make immediately freeze the system. Can you help me? Thank for reading my question!
Yea i was wondering how i would mount, and create a FAT directory that way i can save files in the FAT directory in a windows system and be able to access them on Linux systems. Or if there is any other way to share files between Linux and Windows. Any responds will help... thanks! (2 Replies)
Hi,
I wrote a kernel module that did a virtual network protocol and library that provide interface for application use to interact with the kernel module by ioctl actions.
insmod the module and unload the module, there will be no problem. But once I call the library with my example... (0 Replies)
Hi,
My SCO server freezes suddenly. I just want to know if there any tools / commands availble that can find which is causing the freeze?
Any help on this would be greatly appreciated.
Regards,
Ravikumar R (4 Replies)
Hi,
I wrote a program, to read from a master terminal.
However, the 'read' system call keeps returning the same data endlessly (I expected it to read once and then block).
What will cause t data to be flushed, after 1 read?
#include <stdio.h>
#include <string.h>
#include <sys/types.h>... (1 Reply)
Hi,
In order to have a sand box machine that I could use to test some system changes before going to production state, I'd like to duplicate a working system to a virtual one. Ideally, I'd like to manage to do it this way :
- Make a full system backup excluding the user file system (this... (7 Replies)
Hi,
I have requirement for automation, wanna confirm whether is it possible in shell scripting.
1) Need to read data from excel sheet
2) And upload the details in html page
I know first requirement is possible by converting excel into csv form, but not sure about the second one.
If... (6 Replies)
I have downloaded and installed a library called htslib for specific bioinformatic use but not for the system (I'm using Ubuntu 18.04). Only parts of the library is needed for my exercise to parse data in a type called VCF format (basically tab-delimited file but contains many information in... (14 Replies)
Discussion started by: yifangt
14 Replies
LEARN ABOUT SUSE
query_module
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);
DESCRIPTION
query_module() requests information from the kernel about loadable modules. 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 opera-
tion specified by which. Some operations require name to identify a currently 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 kernel source file include/linux/mod-
ule.h). ret is set to the size of the module_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 minimum size needed.
ENOSYS query_module() is not supported in this version of the kernel.
CONFORMING TO
query_module() is Linux-specific.
NOTES
This system call is only present on Linux up until kernel 2.4; it was removed in Linux 2.6. Some of the information that was available via
query_module() can be obtained from /proc/modules, /proc/kallsyms, and /sys/modules.
SEE ALSO create_module(2), delete_module(2), get_kernel_syms(2), init_module(2)COLOPHON
This page is part of release 3.25 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 2007-06-03 QUERY_MODULE(2)