158 lines
4.2 KiB
C
158 lines
4.2 KiB
C
/* This file contains some utility routines for PM.
|
|
*
|
|
* The entry points are:
|
|
* get_free_pid: get a free process or group id
|
|
* no_sys: called for invalid system call numbers
|
|
* find_param: look up a boot monitor parameter
|
|
* find_proc: return process pointer from pid number
|
|
* pm_isokendpt: check the validity of an endpoint
|
|
* tell_fs: send a request to FS on behalf of a process
|
|
*/
|
|
|
|
#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 <machine/archtypes.h>
|
|
#include "kernel/const.h"
|
|
#include "kernel/config.h"
|
|
#include "kernel/type.h"
|
|
#include "kernel/proc.h"
|
|
|
|
#define munmap _munmap
|
|
#define munmap_text _munmap_text
|
|
#include <sys/mman.h>
|
|
#undef munmap
|
|
#undef munmap_text
|
|
|
|
/*===========================================================================*
|
|
* 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);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* 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);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* find_proc *
|
|
*===========================================================================*/
|
|
PUBLIC struct mproc *find_proc(lpid)
|
|
pid_t lpid;
|
|
{
|
|
register struct mproc *rmp;
|
|
|
|
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
|
|
if ((rmp->mp_flags & IN_USE) && rmp->mp_pid == lpid)
|
|
return(rmp);
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* 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;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* tell_fs *
|
|
*===========================================================================*/
|
|
PUBLIC void tell_fs(rmp, m_ptr)
|
|
struct mproc *rmp;
|
|
message *m_ptr;
|
|
{
|
|
/* Send a request to VFS, without blocking.
|
|
*/
|
|
int r;
|
|
|
|
if (rmp->mp_flags & FS_CALL)
|
|
panic("tell_fs: not idle: %d", m_ptr->m_type);
|
|
|
|
r = asynsend3(VFS_PROC_NR, m_ptr, AMF_NOREPLY);
|
|
if (r != OK)
|
|
panic("unable to send to FS: %d", r);
|
|
|
|
rmp->mp_flags |= FS_CALL;
|
|
}
|
|
|
|
int unmap_ok = 0;
|
|
|
|
PUBLIC int munmap(void *addrstart, vir_bytes len)
|
|
{
|
|
if(!unmap_ok)
|
|
return ENOSYS;
|
|
|
|
return _munmap(addrstart, len);
|
|
}
|
|
|
|
PUBLIC int munmap_text(void *addrstart, vir_bytes len)
|
|
{
|
|
if(!unmap_ok)
|
|
return ENOSYS;
|
|
|
|
return _munmap_text(addrstart, len);
|
|
|
|
}
|