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.
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_EXEC
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (process that did exec call)
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#if DEAD_CODE
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* m1_i3: PR_TRACING (flag to indicate tracing is on/ off)
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#endif
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* m1_p1: PR_STACK_PTR (new stack pointer)
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* m1_p2: PR_NAME_PTR (pointer to program name)
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* m1_p3: PR_IP_PTR (new instruction pointer)
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*/
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#include "../system.h"
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#include <signal.h>
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#if USE_EXEC
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/*===========================================================================*
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* do_exec *
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*===========================================================================*/
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PUBLIC int do_exec(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
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register struct proc *rp;
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reg_t sp; /* new sp */
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phys_bytes phys_name;
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char *np;
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rp = proc_addr(m_ptr->PR_PROC_NR);
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#if DEAD_CODE
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if (m_ptr->PR_TRACING) cause_sig(m_ptr->PR_PROC_NR, SIGTRAP);
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#endif
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sp = (reg_t) m_ptr->PR_STACK_PTR;
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rp->p_reg.sp = sp; /* set the stack pointer */
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#if (CHIP == M68000)
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rp->p_splow = sp; /* set the stack pointer low water */
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#ifdef FPP
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/* Initialize fpp for this process */
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fpp_new_state(rp);
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#endif
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#endif
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#if (CHIP == INTEL) /* wipe extra LDT entries */
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kmemset(&rp->p_ldt[EXTRA_LDT_INDEX], 0,
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(LDT_SIZE - EXTRA_LDT_INDEX) * sizeof(rp->p_ldt[0]));
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#endif
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rp->p_reg.pc = (reg_t) m_ptr->PR_IP_PTR; /* set pc */
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rp->p_rts_flags &= ~RECEIVING; /* PM does not reply to EXEC call */
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if (rp->p_rts_flags == 0) lock_ready(rp);
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/* Save command name for debugging, ps(1) output, etc. */
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phys_name = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->PR_NAME_PTR,
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(vir_bytes) P_NAME_LEN - 1);
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if (phys_name != 0) {
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phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) P_NAME_LEN - 1);
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for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
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*np = 0; /* mark end */
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} else {
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kstrncpy(rp->p_name, "<unset>", P_NAME_LEN);
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}
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return(OK);
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}
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#endif /* USE_EXEC */
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