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Top Forums Programming can a linux kernel module call libc functions? Post 302573075 by otheus on Saturday 12th of November 2011 07:29:34 PM
Old 11-12-2011
No, absolutely not. There are internal, kernel-specific functions for some of those. If you're asking this question, you must absolutely read the O'Reilley published book on writing Linux device drivers.
 

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modload(1M)						  System Administration Commands					       modload(1M)

NAME
modload - load a kernel module SYNOPSIS
modload [-p] [-e exec_file] filename DESCRIPTION
The modload command loads the loadable module filename into the running system. filename is an object file produced by ld -r. If filename is an absolute pathname then the file specified by that absolute path is loaded. If filename does not begin with a slash (/), then the path to load filename is relative to the current directory unless the -p option is specified. The kernel's modpath variable can be set using the /etc/system file. The default value of the kernel's modpath variable is set to the path where the operating system was loaded. Typically this is /kernel /usr/kernel. For example, the following command looks for ./drv/foo: example# modload drv/foo The following command looks for /kernel/drv/foo and then /usr/kernel/drv/foo: example# modload -p drv/foo OPTIONS
The following options are supported: -e exec_file Specify the name of a shell script or executable image file that is executed after the module is successfully loaded. The first argument passed is the module ID (in decimal). The other argument is module specific. The module specific information is: the block and character major numbers for drivers, the system call number for system calls, or, for other module types, the index into the appropriate kernel table. See modinfo(1M) -p Use the kernel's internal modpath variable as the search path for the module. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
ld(1), add_drv(1M), kernel(1M), modinfo(1M), modunload(1M), system(4), attributes(5), modldrv(9S), modlinkage(9S), modlstrmod(9S), mod- ule_info(9S) Writing Device Drivers NOTES
Use add_drv(1M) to add device drivers, not modload. See Writing Device Drivers for procedures on adding device drivers. SunOS 5.10 1 Dec 1993 modload(1M)
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