139 lines
4.0 KiB
C
139 lines
4.0 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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* get_free_pid: get a free process or group id
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* find_param: look up a boot monitor parameter
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* find_proc: return process pointer from pid number
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* nice_to_priority convert nice level to priority queue
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* pm_isokendpt: check the validity of an endpoint
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* tell_vfs: send a request to VFS on behalf of a process
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*/
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#include "pm.h"
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#include <sys/resource.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 <minix/config.h>
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#include <minix/timers.h>
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#include <machine/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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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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* find_param *
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*===========================================================================*/
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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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* find_proc *
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*===========================================================================*/
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struct mproc *find_proc(lpid)
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pid_t lpid;
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{
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register struct mproc *rmp;
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
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if ((rmp->mp_flags & IN_USE) && rmp->mp_pid == lpid)
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return(rmp);
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return(NULL);
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}
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/*===========================================================================*
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* nice_to_priority *
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*===========================================================================*/
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int nice_to_priority(int nice, unsigned* new_q)
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{
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if (nice < PRIO_MIN || nice > PRIO_MAX) return(EINVAL);
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*new_q = MAX_USER_Q + (nice-PRIO_MIN) * (MIN_USER_Q-MAX_USER_Q+1) /
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(PRIO_MAX-PRIO_MIN+1);
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/* Neither of these should ever happen. */
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if ((signed) *new_q < MAX_USER_Q) *new_q = MAX_USER_Q;
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if (*new_q > MIN_USER_Q) *new_q = MIN_USER_Q;
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return (OK);
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}
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/*===========================================================================*
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* pm_isokendpt *
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*===========================================================================*/
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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 < 0 || *proc >= NR_PROCS)
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return EINVAL;
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if (endpoint != mproc[*proc].mp_endpoint)
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return EDEADEPT;
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if (!(mproc[*proc].mp_flags & IN_USE))
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return EDEADEPT;
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return OK;
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}
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/*===========================================================================*
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* tell_vfs *
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*===========================================================================*/
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void tell_vfs(rmp, m_ptr)
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struct mproc *rmp;
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message *m_ptr;
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{
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/* Send a request to VFS, without blocking.
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*/
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int r;
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if (rmp->mp_flags & VFS_CALL)
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panic("tell_vfs: not idle: %d", m_ptr->m_type);
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r = asynsend3(VFS_PROC_NR, m_ptr, AMF_NOREPLY);
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if (r != OK)
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panic("unable to send to VFS: %d", r);
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rmp->mp_flags |= VFS_CALL;
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}
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