minix/kernel/system/do_unused.c

/* This file provides a catch-all handler for unused kernel calls. A kernel 
 * call may be unused when it is not defined or when it is disabled in the
 * kernel's configuration.
 */
#include "../system.h"

/*===========================================================================*
 *			          do_unused				     *
 *===========================================================================*/
PUBLIC int do_unused(struct proc * caller, message * m_ptr)
{
  kprintf("SYSTEM: got unused request %d from %d\n",
		  m_ptr->m_type, m_ptr->m_source);
  return(EBADREQUEST);			/* illegal message type */
}
Al's system call -> kernel call renaming 2005-10-14 10:58:59 +02:00			`/* This file provides a catch-all handler for unused kernel calls. A kernel`
Various small cleanups and comments added. 2005-08-05 11:41:15 +02:00			`* call may be unused when it is not defined or when it is disabled in the`
			`* kernel's configuration.`
			`*/`
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability. 2005-07-14 17:12:12 +02:00			`#include "../system.h"`

			`/===========================================================================`
			`* do_unused *`
			`===========================================================================/`
This patch removes the global variables who_p and who_e from the kernel (sys task). The main reason is that these would have to become cpu local variables on SMP. Once the system task is not a task but a genuine part of the kernel there is even less reason to have these extra variables as proc_ptr will already contain all neccessary information. In addition converting who_e to the process pointer and back again all the time will be avoided. Although proc_ptr will contain all important information, accessing it as a cpu local variable will be fairly expensive, hence the value would be assigned to some on stack local variable. Therefore it is better to add the 'caller' argument to the syscall handlers to pass the value on stack anyway. It also clearly denotes on who's behalf is the syscall being executed. This patch also ANSIfies the syscall function headers. Last but not least, it also fixes a potential bug in virtual_copy_f() in case the check is disabled. So far the function in case of a failure could possible reuse an old who_p in case this function had not been called from the system task. virtual_copy_f() takes the caller as a parameter too. In case the checking is disabled, the caller must be NULL and non NULL if it is enabled as we must be able to suspend the caller. 2010-02-03 10:04:48 +01:00			`PUBLIC int do_unused(struct proc * caller, message * m_ptr)`
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability. 2005-07-14 17:12:12 +02:00			`{`
This patch removes the global variables who_p and who_e from the kernel (sys task). The main reason is that these would have to become cpu local variables on SMP. Once the system task is not a task but a genuine part of the kernel there is even less reason to have these extra variables as proc_ptr will already contain all neccessary information. In addition converting who_e to the process pointer and back again all the time will be avoided. Although proc_ptr will contain all important information, accessing it as a cpu local variable will be fairly expensive, hence the value would be assigned to some on stack local variable. Therefore it is better to add the 'caller' argument to the syscall handlers to pass the value on stack anyway. It also clearly denotes on who's behalf is the syscall being executed. This patch also ANSIfies the syscall function headers. Last but not least, it also fixes a potential bug in virtual_copy_f() in case the check is disabled. So far the function in case of a failure could possible reuse an old who_p in case this function had not been called from the system task. virtual_copy_f() takes the caller as a parameter too. In case the checking is disabled, the caller must be NULL and non NULL if it is enabled as we must be able to suspend the caller. 2010-02-03 10:04:48 +01:00			`kprintf("SYSTEM: got unused request %d from %d\n",`
			`m_ptr->m_type, m_ptr->m_source);`
Moved "Changes" comments from system/do_....c to system.h. All changes are now in a single header file. 2005-08-10 12:23:55 +02:00			`return(EBADREQUEST); /* illegal message type */`
Reorganized system call library; uses separate file per call now. New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability. 2005-07-14 17:12:12 +02:00			`}`