minix/kernel/system/do_abort.c
Jorrit Herder 0946d128cd - Kernel call handlers cleaned up. More strict checking of input parameters.
- Moved generic_handler() from system.c to system/do_irqctl.c.
- Set privileges of system processes somewhat stricter.
2005-07-29 15:26:23 +00:00

50 lines
1.6 KiB
C

/* The system call implemented in this file:
* m_type: SYS_ABORT
*
* The parameters for this system call are:
* m1_i1: ABRT_HOW (how to abort, possibly fetch monitor params)
* m1_i2: ABRT_MON_PROC (proc nr to get monitor params from)
* m1_i3: ABRT_MON_LEN (length of monitor params)
* m1_p1: ABRT_MON_ADDR (virtual address of params)
*/
#include "../system.h"
#include <unistd.h>
#if USE_ABORT
/*===========================================================================*
* do_abort *
*===========================================================================*/
PUBLIC int do_abort(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Handle sys_abort. MINIX is unable to continue. This can originate in the
* PM (normal abort or panic) or FS (panic), or TTY (after CTRL-ALT-DEL).
*/
int how = m_ptr->ABRT_HOW;
int proc_nr;
int length;
phys_bytes src_phys;
/* See if the monitor is to run the specified instructions. */
if (how == RBT_MONITOR) {
proc_nr = m_ptr->ABRT_MON_PROC;
if (! isokprocn(proc_nr)) return(EINVAL);
length = m_ptr->ABRT_MON_LEN + 1;
if (length > kinfo.params_size) return(E2BIG);
src_phys = numap_local(proc_nr,(vir_bytes)m_ptr->ABRT_MON_ADDR,length);
if (! src_phys) return(EFAULT);
/* Parameters seem ok, copy them and prepare shutting down. */
phys_copy(src_phys, kinfo.params_base, (phys_bytes) length);
}
/* Now prepare to shutdown MINIX. */
prepare_shutdown(how);
return(OK); /* pro-forma (really EDISASTER) */
}
#endif /* USE_ABORT */