65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_FORK
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (child's process table slot)
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* m1_i2: PR_PPROC_NR (parent, process that forked)
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* m1_i3: PR_PID (child pid received from MM)
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*/
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#include "../kernel.h"
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#include "../system.h"
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#include <signal.h>
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#include "../sendmask.h"
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INIT_ASSERT
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/*===========================================================================*
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* do_fork *
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*===========================================================================*/
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PUBLIC int do_fork(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_fork(). PR_PPROC_NR has forked. The child is PR_PROC_NR. */
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#if (CHIP == INTEL)
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reg_t old_ldt_sel;
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#endif
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register struct proc *rpc;
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struct proc *rpp;
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rpp = proc_addr(m_ptr->PR_PPROC_NR);
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assert(isuserp(rpp));
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rpc = proc_addr(m_ptr->PR_PROC_NR);
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assert(isemptyp(rpc));
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/* Copy parent 'proc' struct to child. */
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#if (CHIP == INTEL)
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old_ldt_sel = rpc->p_ldt_sel; /* stop this being obliterated by copy */
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#endif
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*rpc = *rpp; /* copy 'proc' struct */
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#if (CHIP == INTEL)
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rpc->p_ldt_sel = old_ldt_sel;
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#endif
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rpc->p_nr = m_ptr->PR_PROC_NR; /* this was obliterated by copy */
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rpc->p_flags |= NO_MAP; /* inhibit the process from running */
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rpc->p_flags &= ~(PENDING | SIG_PENDING | P_STOP);
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/* Only 1 in group should have PENDING, child does not inherit trace status*/
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sigemptyset(&rpc->p_pending);
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rpc->p_pendcount = 0;
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rpc->p_reg.retreg = 0; /* child sees pid = 0 to know it is child */
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rpc->user_time = 0; /* set all the accounting times to 0 */
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rpc->sys_time = 0;
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rpc->child_utime = 0;
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rpc->child_stime = 0;
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return(OK);
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}
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