minix/servers/pm/utility.c
Ben Gras 448376ee7e . use library function to parse memory string
. remove unused variables and some other gcc warnings
2007-02-16 15:55:20 +00:00

169 lines
5 KiB
C

/* This file contains some utility routines for PM.
*
* The entry points are:
* find_param: look up a boot monitor parameter
* get_free_pid: get a free process or group id
* allowed: see if an access is permitted
* no_sys: called for invalid system call numbers
* panic: PM has run aground of a fatal error
* get_mem_map: get memory map of given process
* get_stack_ptr: get stack pointer of given process
* proc_from_pid: return process pointer from pid number
*/
#include "pm.h"
#include <sys/stat.h>
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/endpoint.h>
#include <fcntl.h>
#include <signal.h> /* needed only because mproc.h needs it */
#include "mproc.h"
#include "param.h"
#include <minix/config.h>
#include <timers.h>
#include <string.h>
#include <archconst.h>
#include <archtypes.h>
#include "../../kernel/const.h"
#include "../../kernel/config.h"
#include "../../kernel/type.h"
#include "../../kernel/proc.h"
/*===========================================================================*
* get_free_pid *
*===========================================================================*/
PUBLIC pid_t get_free_pid()
{
static pid_t next_pid = INIT_PID + 1; /* next pid to be assigned */
register struct mproc *rmp; /* check process table */
int t; /* zero if pid still free */
/* Find a free pid for the child and put it in the table. */
do {
t = 0;
next_pid = (next_pid < NR_PIDS ? next_pid + 1 : INIT_PID + 1);
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
if (rmp->mp_pid == next_pid || rmp->mp_procgrp == next_pid) {
t = 1;
break;
}
} while (t); /* 't' = 0 means pid free */
return(next_pid);
}
/*===========================================================================*
* no_sys *
*===========================================================================*/
PUBLIC int no_sys()
{
/* A system call number not implemented by PM has been requested. */
printf("PM: in no_sys, call nr %d from %d\n", call_nr, who_e);
return(ENOSYS);
}
/*===========================================================================*
* panic *
*===========================================================================*/
PUBLIC void panic(who, mess, num)
char *who; /* who caused the panic */
char *mess; /* panic message string */
int num; /* number to go with it */
{
/* An unrecoverable error has occurred. Panics are caused when an internal
* inconsistency is detected, e.g., a programming error or illegal value of a
* defined constant. The process manager decides to exit.
*/
printf("PM panic (%s): %s", who, mess);
if (num != NO_NUM) printf(": %d",num);
printf("\n");
/* Exit PM. */
sys_exit(SELF);
}
/*===========================================================================*
* find_param *
*===========================================================================*/
PUBLIC char *find_param(name)
const char *name;
{
register const char *namep;
register char *envp;
for (envp = (char *) monitor_params; *envp != 0;) {
for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
;
if (*namep == '\0' && *envp == '=')
return(envp + 1);
while (*envp++ != 0)
;
}
return(NULL);
}
/*===========================================================================*
* get_mem_map *
*===========================================================================*/
PUBLIC int get_mem_map(proc_nr, mem_map)
int proc_nr; /* process to get map of */
struct mem_map *mem_map; /* put memory map here */
{
struct proc p;
int s;
if ((s=sys_getproc(&p, proc_nr)) != OK)
return(s);
memcpy(mem_map, p.p_memmap, sizeof(p.p_memmap));
return(OK);
}
/*===========================================================================*
* get_stack_ptr *
*===========================================================================*/
PUBLIC int get_stack_ptr(proc_nr_e, sp)
int proc_nr_e; /* process to get sp of */
vir_bytes *sp; /* put stack pointer here */
{
struct proc p;
int s;
if ((s=sys_getproc(&p, proc_nr_e)) != OK)
return(s);
*sp = p.p_reg.sp;
return(OK);
}
/*===========================================================================*
* proc_from_pid *
*===========================================================================*/
PUBLIC int proc_from_pid(mp_pid)
pid_t mp_pid;
{
int rmp;
for (rmp = 0; rmp < NR_PROCS; rmp++)
if (mproc[rmp].mp_pid == mp_pid)
return rmp;
return -1;
}
/*===========================================================================*
* pm_isokendpt *
*===========================================================================*/
PUBLIC int pm_isokendpt(int endpoint, int *proc)
{
*proc = _ENDPOINT_P(endpoint);
if(*proc < -NR_TASKS || *proc >= NR_PROCS)
return EINVAL;
if(*proc >= 0 && endpoint != mproc[*proc].mp_endpoint)
return EDEADSRCDST;
if(*proc >= 0 && !(mproc[*proc].mp_flags & IN_USE))
return EDEADSRCDST;
return OK;
}