linux::kernelsort(3pm) [debian man page]
Linux::KernelSort(3pm) User Contributed Perl Documentation Linux::KernelSort(3pm) NAME
Linux::KernelSort - Perl extension for sorting and comparing Linux kernel versions. The expected kernel version naming convention is the same naming convetion demonstrated by http://www.kernel.org. NOTE: Currently, only the 2.6.x series of kernels (including -rc's, -git's, and -mm's) are properly evaluated. SYNOPSIS
use Linux::KernelSort; my $kernel = new Linux::KernelSort; my $ret; my $version1 = "2.6.19"; my $version2 = "2.6.19-rc2-git7"; $ret = $kernel->compare($version1, $version2); if ($ret == 0) { print "$version1 and $version2 are the same version "; } elsif ($ret > 0) { print "$version1 is newer than $version2 "; } else { print "$version1 is older than $version2 "; } my @kernel_list = ( '2.6.15', '2.6.18', '2.6.18-rc2', '2.6.18-rc2-git2', '2.6.18-mm1', '2.6.18-rc2-mm1' ); my @sorted_list = $kernel->sort(@kernel_list); print join( ', ', @sorted_list ); DESCRIPTION
Linux::KernelSort is intended to sort a list of kernel versions into ascending order. It also provides the capability to compare two ker- nel versions and determine if one version is newer, older, or the same as the other version. FUNCTIONS
version_check() Purpose: Verify the version is valid and follows the proper naming convention demonstrated by http://www.kernel.org Input: A string containing the kernel version Return: 0 if version is valid 1 if version is invalid rank() Purpose: Generate a ranking for a given kernel version Input: A string containing the kernel version which follows the proper naming convention demonstrated by http://www.kernel.org Return: Kernel ranking compare() Purpose: Compare two kernel versions Input: Strings ($kernel1, $kernel2) each containing a kernel version which follows the proper naming conventaion demonstrated by http://www.kernel.org Return -1 if $kernel1 < $kernel2 (ie $kernel1 is older than $kernel2) 0 if $kernel1 == $kernel2 (ie $kernel1 is the same version as $kernel2) 1 if $kernel1 > $kernel2 (ie $kernel1 is newer than $kernel2) sort() Purpose: Sort a list of kernel versions in ascending order. Uses shell sort algorithm. Input: Array of strings containing kernel versions which follows the proper naming convention demonstrated by http://www.kernel.org Return: Sorted array AUTHOR
Leann Ogasawara <lt>ogasawara@osdl.org<gt> COPYRIGHT AND LICENSE
Linux-KernelSort is Copyright (c) 2006, by Leann Ogasawara. All rights reserved. You may distribute this code under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl README file. perl v5.8.8 2008-02-23 Linux::KernelSort(3pm)
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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); 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)