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System processes can be signaled; signals are transformed in SYS_EVENT message

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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.
This commit is contained in:
Jorrit Herder
2005-07-19 12:21:36 +00:00
parent f8c380c195
commit 198c976f7e
33 changed files with 289 additions and 395 deletions
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28
kernel/proc.c
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@@ -62,19 +62,27 @@ FORWARD _PROTOTYPE( void sched, (struct proc *rp) );
FORWARD _PROTOTYPE( void pick_proc, (void) );
#if TEMP_CODE
#define BuildOldMess(m,n) \
(m).NOTIFY_SOURCE = (n)->n_source, \
(m).NOTIFY_TYPE = (n)->n_type, \
(m).NOTIFY_FLAGS = (n)->n_flags, \
(m).NOTIFY_ARG = (n)->n_arg;
#endif
#define BuildMess(m_ptr, src, dst_ptr) \
(m_ptr)->m_source = (src); \
(m_ptr)->m_type = NOTIFY_FROM(src); \
(m_ptr)->NOTIFY_TIMESTAMP = get_uptime(); \
if ((src) == HARDWARE) { \
switch (src) { \
case HARDWARE: \
(m_ptr)->NOTIFY_ARG = priv(dst_ptr)->s_int_pending; \
priv(dst_ptr)->s_int_pending = 0; \
break; \
case SYSTEM: \
(m_ptr)->NOTIFY_ARG = priv(dst_ptr)->s_sig_pending; \
priv(dst_ptr)->s_sig_pending = 0; \
break; \
}
#if (CHIP == INTEL)
@@ -123,24 +131,16 @@ message *m_ptr; /* pointer to message in the caller's space */
return(EBADSRCDST);
#if DEAD_CODE /* temporarily disabled for testing ALERT */
/* Check validity of message pointer. */
vb = (vir_bytes) m_ptr;
vlo = vb >> CLICK_SHIFT; /* vir click for bottom of message */
vhi = (vb + MESS_SIZE - 1) >> CLICK_SHIFT; /* vir click for top of msg */
#if ALLOW_GAP_MESSAGES
/* This check allows a message to be anywhere in data or stack or gap.
* It will have to be made more elaborate later for machines which
* don't have the gap mapped.
*/
vb = (vir_bytes) m_ptr;
vlo = vb >> CLICK_SHIFT; /* vir click for bottom of message */
vhi = (vb + MESS_SIZE - 1) >> CLICK_SHIFT; /* vir click for top of msg */
if (vlo < caller_ptr->p_memmap[D].mem_vir || vlo > vhi ||
vhi >= caller_ptr->p_memmap[S].mem_vir + caller_ptr->p_memmap[S].mem_len)
return(EFAULT);
#else
/* Check for messages wrapping around top of memory or outside data seg. */
if (vhi < vlo ||
vhi - caller_ptr->p_memmap[D].mem_vir >= caller_ptr->p_memmap[D].mem_len)
return(EFAULT);
#endif
#endif
/* Now check if the call is known and try to perform the request. The only
@@ -183,9 +183,11 @@ message *m_ptr; /* pointer to message in the caller's space */
break;
case NOTIFY:
result = mini_notify(caller_ptr, src_dst, m_ptr);
#if TEMP_CODE
break;
case ECHO:
kprintf("Echo message from process %s\n", proc_nr(caller_ptr));
#endif
CopyMess(caller_ptr->p_nr, caller_ptr, m_ptr, caller_ptr, m_ptr);
result = OK;
break;
@@ -197,7 +199,7 @@ message *m_ptr; /* pointer to message in the caller's space */
* be raised. The priority may have been lowered if a process consumed too
* many full quantums in a row to prevent damage from infinite loops
*/
#if DEAD_CODE /* temporarily disabled for testing ALERT */
#if DEAD_CODE /* buggy ... do unready() first! */
if ((caller_ptr->p_priority > caller_ptr->p_max_priority) &&
! (flags & NON_BLOCKING) && (result == OK)) {
caller_ptr->p_priority = caller_ptr->p_max_priority;