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Message type for SYS_FORK

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Change-Id: Ibcf4fdfec51129b2be3d667ec07aea0f42e3fd89
This commit is contained in:
Lionel Sambuc
2014-05-26 11:42:00 +02:00
parent 2027f8bc78
commit cc0c1fbd75
4 changed files with 39 additions and 19 deletions
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27
kernel/system/do_fork.c
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@@ -2,10 +2,11 @@
* m_type: SYS_FORK
*
* The parameters for this kernel call are:
* m1_i1: PR_ENDPT (parent, process that forked)
* m1_i2: PR_SLOT (child's process table slot)
* m1_p1: PR_MEM_PTR (new memory map for the child)
* m1_i3: PR_FORK_FLAGS (fork flags)
* m_lsys_krn_sys_fork.endpt (parent, process that forked)
* m_lsys_krn_sys_fork.slot (child's process table slot)
* m_lsys_krn_sys_fork.flags (fork flags)
* m_krn_lsys_sys_fork.endpt (endpoint of the child)
* m_krn_lsys_sys_fork.msgaddr (new memory map for the child)
*/
#include "kernel/system.h"
@@ -24,7 +25,10 @@
*===========================================================================*/
int do_fork(struct proc * caller, message * m_ptr)
{
/* Handle sys_fork(). PR_ENDPT has forked. The child is PR_SLOT. */
/* Handle sys_fork().
* m_lsys_krn_sys_fork.endpt has forked.
* The child is m_lsys_krn_sys_fork.slot.
*/
#if defined(__i386__)
char *old_fpu_save_area_p;
#endif
@@ -34,11 +38,11 @@ int do_fork(struct proc * caller, message * m_ptr)
int p_proc;
int namelen;
if(!isokendpt(m_ptr->PR_ENDPT, &p_proc))
if(!isokendpt(m_ptr->m_lsys_krn_sys_fork.endpt, &p_proc))
return EINVAL;
rpp = proc_addr(p_proc);
rpc = proc_addr(m_ptr->PR_SLOT);
rpc = proc_addr(m_ptr->m_lsys_krn_sys_fork.slot);
if (isemptyp(rpp) || ! isemptyp(rpc)) return(EINVAL);
assert(!(rpp->p_misc_flags & MF_DELIVERMSG));
@@ -64,7 +68,7 @@ int do_fork(struct proc * caller, message * m_ptr)
#endif
if(++gen >= _ENDPOINT_MAX_GENERATION) /* increase generation */
gen = 1; /* generation number wraparound */
rpc->p_nr = m_ptr->PR_SLOT; /* this was obliterated by copy */
rpc->p_nr = m_ptr->m_lsys_krn_sys_fork.slot; /* this was obliterated by copy */
rpc->p_endpoint = _ENDPOINT(gen, rpc->p_nr); /* new endpoint of slot */
rpc->p_reg.retreg = 0; /* child sees pid = 0 to know it is child */
@@ -102,11 +106,11 @@ int do_fork(struct proc * caller, message * m_ptr)
}
/* Calculate endpoint identifier, so caller knows what it is. */
m_ptr->PR_ENDPT = rpc->p_endpoint;
m_ptr->PR_FORK_MSGADDR = (char *) rpp->p_delivermsg_vir;
m_ptr->m_krn_lsys_sys_fork.endpt = rpc->p_endpoint;
m_ptr->m_krn_lsys_sys_fork.msgaddr = rpp->p_delivermsg_vir;
/* Don't schedule process in VM mode until it has a new pagetable. */
if(m_ptr->PR_FORK_FLAGS & PFF_VMINHIBIT) {
if(m_ptr->m_lsys_krn_sys_fork.flags & PFF_VMINHIBIT) {
RTS_SET(rpc, RTS_VMINHIBIT);
}
@@ -128,4 +132,3 @@ int do_fork(struct proc * caller, message * m_ptr)
}
#endif /* USE_FORK */