minix/kernel/system/proctl.c
2005-04-29 15:36:43 +00:00

223 lines
6.7 KiB
C

/* The system call implemented in this file:
* m_type: SYS_FORK
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (child's process table slot)
* m1_i2: PR_PPROC_NR (parent, process that forked)
* m1_i3: PR_PID (child pid received from PM)
*/
#include "../kernel.h"
#include "../system.h"
#include "../sendmask.h"
#include <signal.h>
#if (CHIP == INTEL)
#include "../protect.h"
#endif
INIT_ASSERT
/*===========================================================================*
* do_fork *
*===========================================================================*/
PUBLIC int do_fork(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Handle sys_fork(). PR_PPROC_NR has forked. The child is PR_PROC_NR. */
#if (CHIP == INTEL)
reg_t old_ldt_sel;
#endif
register struct proc *rpc;
struct proc *rpp;
rpp = proc_addr(m_ptr->PR_PPROC_NR);
assert(isuserp(rpp));
rpc = proc_addr(m_ptr->PR_PROC_NR);
assert(isemptyp(rpc));
/* Copy parent 'proc' struct to child. */
#if (CHIP == INTEL)
old_ldt_sel = rpc->p_ldt_sel; /* stop this being obliterated by copy */
#endif
*rpc = *rpp; /* copy 'proc' struct */
#if (CHIP == INTEL)
rpc->p_ldt_sel = old_ldt_sel;
#endif
rpc->p_nr = m_ptr->PR_PROC_NR; /* this was obliterated by copy */
rpc->p_flags |= NO_MAP; /* inhibit the process from running */
rpc->p_flags &= ~(PENDING | SIG_PENDING | P_STOP);
/* Only 1 in group should have PENDING, child does not inherit trace status*/
sigemptyset(&rpc->p_pending);
rpc->p_pendcount = 0;
rpc->p_reg.retreg = 0; /* child sees pid = 0 to know it is child */
rpc->user_time = 0; /* set all the accounting times to 0 */
rpc->sys_time = 0;
rpc->child_utime = 0;
rpc->child_stime = 0;
return(OK);
}
/* The system call implemented in this file:
* m_type: SYS_NEWMAP
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (install new map for this process)
* m1_p1: PR_MEM_PTR (pointer to memory map)
*/
/*===========================================================================*
* do_newmap *
*===========================================================================*/
PUBLIC int do_newmap(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Handle sys_newmap(). Fetch the memory map from PM. */
register struct proc *rp;
phys_bytes src_phys;
int caller; /* whose space has the new map (usually PM) */
int k; /* process whose map is to be loaded */
int old_flags; /* value of flags before modification */
struct mem_map *map_ptr; /* virtual address of map inside caller (PM) */
/* Extract message parameters and copy new memory map from PM. */
caller = m_ptr->m_source;
k = m_ptr->PR_PROC_NR;
map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
if (!isokprocn(k)) return(EINVAL);
rp = proc_addr(k); /* ptr to entry of user getting new map */
/* Copy the map from PM. */
src_phys = umap_local(proc_addr(caller), D, (vir_bytes) map_ptr,
sizeof(rp->p_memmap));
assert(src_phys != 0);
phys_copy(src_phys,vir2phys(rp->p_memmap),(phys_bytes)sizeof(rp->p_memmap));
#if (CHIP != M68000)
alloc_segments(rp);
#else
pmmu_init_proc(rp);
#endif
old_flags = rp->p_flags; /* save the previous value of the flags */
rp->p_flags &= ~NO_MAP;
if (old_flags != 0 && rp->p_flags == 0) lock_ready(rp);
return(OK);
}
/* The system call implemented in this file:
* m_type: SYS_EXEC
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (process that did exec call)
* m1_i3: PR_TRACING (flag to indicate tracing is on/ off)
* m1_p1: PR_STACK_PTR (new stack pointer)
* m1_p2: PR_NAME_PTR (pointer to program name)
* m1_p3: PR_IP_PTR (new instruction pointer)
*/
/*===========================================================================*
* do_exec *
*===========================================================================*/
PUBLIC int do_exec(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
register struct proc *rp;
reg_t sp; /* new sp */
phys_bytes phys_name;
char *np;
#define NLEN (sizeof(rp->p_name)-1)
rp = proc_addr(m_ptr->PR_PROC_NR);
assert(isuserp(rp));
if (m_ptr->PR_TRACING) cause_sig(m_ptr->PR_PROC_NR, SIGTRAP);
sp = (reg_t) m_ptr->PR_STACK_PTR;
rp->p_reg.sp = sp; /* set the stack pointer */
#if (CHIP == M68000)
rp->p_splow = sp; /* set the stack pointer low water */
#ifdef FPP
/* Initialize fpp for this process */
fpp_new_state(rp);
#endif
#endif
#if (CHIP == INTEL) /* wipe extra LDT entries */
kmemset(&rp->p_ldt[EXTRA_LDT_INDEX], 0,
(LDT_SIZE - EXTRA_LDT_INDEX) * sizeof(rp->p_ldt[0]));
#endif
rp->p_reg.pc = (reg_t) m_ptr->PR_IP_PTR; /* set pc */
rp->p_flags &= ~RECEIVING; /* PM does not reply to EXEC call */
if (rp->p_flags == 0) lock_ready(rp);
/* Save command name for debugging, ps(1) output, etc. */
phys_name = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->PR_NAME_PTR,
(vir_bytes) NLEN);
if (phys_name != 0) {
phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) NLEN);
for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
*np = 0;
}
return(OK);
}
/* The system call implemented in this file:
* m_type: SYS_XIT
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (slot number of exiting process)
* m1_i2: PR_PPROC_NR (slot number of parent process)
*/
/*===========================================================================*
* do_xit *
*===========================================================================*/
PUBLIC int do_xit(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Handle sys_exit. A user process has exited (the PM sent the request).
*/
register struct proc *rp, *rc;
struct proc *np, *xp;
int exit_proc_nr;
/* Get a pointer to the process that exited. */
exit_proc_nr = m_ptr->PR_PROC_NR;
if (exit_proc_nr == SELF) exit_proc_nr = m_ptr->m_source;
if (! isokprocn(exit_proc_nr)) return(EINVAL);
rc = proc_addr(exit_proc_nr);
/* If this is a user process and the PM passed in a valid parent process,
* accumulate the child times at the parent.
*/
if (isuserp(rc) && isokprocn(m_ptr->PR_PPROC_NR)) {
rp = proc_addr(m_ptr->PR_PPROC_NR);
lock();
rp->child_utime += rc->user_time + rc->child_utime;
rp->child_stime += rc->sys_time + rc->child_stime;
unlock();
}
/* Now call the routine to clean up of the process table slot. This cancels
* outstanding timers, possibly removes the process from the message queues,
* and resets important process table fields.
*/
clear_proc(exit_proc_nr);
return(OK); /* tell PM that cleanup succeeded */
}