198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
76 lines
2.8 KiB
C
Executable file
76 lines
2.8 KiB
C
Executable file
#ifndef PRIV_H
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#define PRIV_H
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/* Declaration of the system privileges structure. It defines flags, system
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* call masks, an synchronous alarm timer, I/O privileges, pending hardware
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* interrupts and notifications, and so on.
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* System processes each get their own structure with properties, whereas all
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* user processes share one structure. This setup provides a clear separation
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* between common and privileged process fields and is very space efficient.
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*
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* Created: Jul 1, 2005 Jorrit N. Herder
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*/
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#include <minix/com.h>
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#include "protect.h"
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#include "const.h"
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#include "type.h"
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struct priv {
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proc_nr_t s_proc_nr; /* number of associated process */
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sys_id_t s_id; /* index of this system structure */
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char s_flags; /* PREEMTIBLE, BILLABLE, etc. */
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char s_call_mask; /* allowed system call traps */
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sys_map_t s_send_mask; /* allowed send destinations */
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long s_sys_mask; /* allowed kernel calls */
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sys_map_t s_notify_pending; /* bit map with pending notifications */
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short s_int_pending; /* pending hardware interrupts */
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sigset_t s_sig_pending; /* pending signals */
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timer_t s_alarm_timer; /* synchronous alarm timer */
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struct far_mem s_farmem[NR_REMOTE_SEGS]; /* remote memory map */
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reg_t *s_stack_guard; /* stack guard word for kernel tasks */
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};
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/* Guard word for task stacks. */
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#define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
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/* Bits for the system property flags. */
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#define PREEMPTIBLE 0x01 /* kernel tasks are not preemptible */
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#define RDY_Q_HEAD 0x02 /* add to queue head instead of tail */
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#define BILLABLE 0x04 /* some processes are not billable */
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#define SYS_PROC 0x10 /* system processes are privileged */
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/* Magic system structure table addresses. */
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#define BEG_PRIV_ADDR (&priv[0])
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#define END_PRIV_ADDR (&priv[NR_SYS_PROCS])
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#define priv_addr(i) (ppriv_addr)[(i)]
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#define priv_id(rp) ((rp)->p_priv->s_id)
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#define priv(rp) ((rp)->p_priv)
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#define id_to_nr(id) priv_addr(id)->s_proc_nr;
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#define nr_to_id(nr) priv(proc_addr(nr))->s_id;
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/* The system structures table and pointers to individual table slots. The
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* pointers allow faster access because now a process entry can be found by
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* indexing the psys_addr array, while accessing an element i requires a
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* multiplication with sizeof(struct sys) to determine the address.
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*/
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EXTERN struct priv priv[NR_SYS_PROCS]; /* system properties table */
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EXTERN struct priv *ppriv_addr[NR_SYS_PROCS]; /* direct slot pointers */
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/* Unprivileged user processes all share the same privilege structure. */
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#define USER_PRIV_ID 0
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/* Make sure the system can boot. The following sanity check verifies that
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* the system privileges table is large enough for the number of processes
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* in the boot image.
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*/
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#if (NR_BOOT_PROCS > NR_SYS_PROCS)
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#error NR_SYS_PROCS must be larger than NR_BOOT_PROCS
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#endif
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#endif /* PRIV_H */
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