116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* This file contains some utility routines for PM.
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*
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* The entry points are:
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* find_param: look up a boot monitor parameter
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* get_free_pid: get a free process or group id
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* allowed: see if an access is permitted
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* no_sys: called for invalid system call numbers
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* panic: PM has run aground of a fatal error
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* get_stack_ptr: get stack pointer of given process
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* proc_from_pid: return process pointer from pid number
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*/
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#include "pm.h"
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#include <sys/stat.h>
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/endpoint.h>
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#include <fcntl.h>
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#include <signal.h> /* needed only because mproc.h needs it */
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#include "mproc.h"
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#include "param.h"
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#include <minix/config.h>
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#include <timers.h>
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#include <string.h>
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#include <archconst.h>
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#include <archtypes.h>
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#include "../../kernel/const.h"
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#include "../../kernel/config.h"
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#include "../../kernel/type.h"
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#include "../../kernel/proc.h"
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/*===========================================================================*
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* get_free_pid *
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*===========================================================================*/
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PUBLIC pid_t get_free_pid()
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{
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static pid_t next_pid = INIT_PID + 1; /* next pid to be assigned */
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register struct mproc *rmp; /* check process table */
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int t; /* zero if pid still free */
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/* Find a free pid for the child and put it in the table. */
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do {
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t = 0;
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next_pid = (next_pid < NR_PIDS ? next_pid + 1 : INIT_PID + 1);
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
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if (rmp->mp_pid == next_pid || rmp->mp_procgrp == next_pid) {
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t = 1;
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break;
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}
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} while (t); /* 't' = 0 means pid free */
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return(next_pid);
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}
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/*===========================================================================*
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* no_sys *
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*===========================================================================*/
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PUBLIC int no_sys()
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{
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/* A system call number not implemented by PM has been requested. */
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printf("PM: in no_sys, call nr %d from %d\n", call_nr, who_e);
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return(ENOSYS);
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}
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/*===========================================================================*
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* find_param *
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*===========================================================================*/
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PUBLIC char *find_param(name)
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const char *name;
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{
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register const char *namep;
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register char *envp;
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for (envp = (char *) monitor_params; *envp != 0;) {
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for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
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;
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if (*namep == '\0' && *envp == '=')
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return(envp + 1);
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while (*envp++ != 0)
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;
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}
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return(NULL);
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}
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/*===========================================================================*
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* proc_from_pid *
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*===========================================================================*/
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PUBLIC int proc_from_pid(mp_pid)
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pid_t mp_pid;
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{
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int rmp;
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for (rmp = 0; rmp < NR_PROCS; rmp++)
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if (mproc[rmp].mp_pid == mp_pid)
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return rmp;
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return -1;
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}
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/*===========================================================================*
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* pm_isokendpt *
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*===========================================================================*/
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PUBLIC int pm_isokendpt(int endpoint, int *proc)
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{
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*proc = _ENDPOINT_P(endpoint);
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if(*proc < -NR_TASKS || *proc >= NR_PROCS)
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return EINVAL;
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if(*proc >= 0 && endpoint != mproc[*proc].mp_endpoint)
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return EDEADSRCDST;
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if(*proc >= 0 && !(mproc[*proc].mp_flags & IN_USE))
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return EDEADSRCDST;
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return OK;
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}
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