minix/servers/pm/misc.c

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/* Miscellaneous system calls. Author: Kees J. Bot
* 31 Mar 2000
* The entry points into this file are:
* do_reboot: kill all processes, then reboot system
* do_svrctl: process manager control
* do_getsysinfo: request copy of PM data structure (Jorrit N. Herder)
* do_getprocnr: lookup process slot number (Jorrit N. Herder)
* do_memalloc: allocate a chunk of memory (Jorrit N. Herder)
* do_memfree: deallocate a chunk of memory (Jorrit N. Herder)
* do_getsetpriority: get/set process priority
*/
#include "pm.h"
#include <minix/callnr.h>
#include <signal.h>
#include <sys/svrctl.h>
#include <sys/resource.h>
#include <minix/com.h>
#include <minix/utils.h>
#include <string.h>
#include "mproc.h"
#include "param.h"
/*===========================================================================*
* do_allocmem *
*===========================================================================*/
PUBLIC int do_allocmem()
{
vir_clicks mem_clicks;
phys_clicks mem_base;
mem_clicks = (m_in.memsize + CLICK_SIZE -1 ) >> CLICK_SHIFT;
mem_base = alloc_mem(mem_clicks);
if (mem_base == NO_MEM) return(ENOMEM);
mp->mp_reply.membase = (phys_bytes) (mem_base << CLICK_SHIFT);
return(OK);
}
/*===========================================================================*
* do_freemem *
*===========================================================================*/
PUBLIC int do_freemem()
{
vir_clicks mem_clicks;
phys_clicks mem_base;
mem_clicks = (m_in.memsize + CLICK_SIZE -1 ) >> CLICK_SHIFT;
mem_base = (m_in.membase + CLICK_SIZE -1 ) >> CLICK_SHIFT;
free_mem(mem_base, mem_clicks);
return(OK);
}
/*===========================================================================*
* do_getsysinfo *
*===========================================================================*/
PUBLIC int do_getsysinfo()
{
struct mproc *proc_addr;
vir_bytes src_addr, dst_addr;
struct kinfo kinfo;
size_t len;
int s;
switch(m_in.info_what) {
case SI_KINFO: /* kernel info is obtained via PM */
sys_getkinfo(&kinfo);
src_addr = (vir_bytes) &kinfo;
len = sizeof(struct kinfo);
break;
case SI_PROC_ADDR: /* get address of PM process table */
proc_addr = &mproc[0];
src_addr = (vir_bytes) &proc_addr;
len = sizeof(struct mproc *);
break;
case SI_PROC_TAB: /* copy entire process table */
src_addr = (vir_bytes) mproc;
len = sizeof(struct mproc) * NR_PROCS;
break;
default:
return(EINVAL);
}
dst_addr = (vir_bytes) m_in.info_where;
if (OK != (s=sys_datacopy(SELF, src_addr, who, dst_addr, len)))
return(s);
return(OK);
}
/*===========================================================================*
* do_getprocnr *
*===========================================================================*/
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PUBLIC int do_getprocnr()
{
register struct mproc *rmp;
static char search_key[PROC_NAME_LEN+1];
int key_len;
int s;
if (m_in.namelen > 0) { /* lookup process by name */
key_len = MIN(m_in.namelen, PROC_NAME_LEN);
if (OK != (s=sys_datacopy(who, (vir_bytes) m_in.addr,
SELF, (vir_bytes) search_key, key_len)))
return(s);
search_key[key_len] = '\0'; /* terminate for safety */
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
if ((rmp->mp_flags & IN_USE) &&
strncmp(rmp->mp_name, search_key, key_len)==0) {
mp->mp_reply.procnr = (int) (rmp - mproc);
return(OK);
}
}
return(ESRCH);
}
else { /* return own process number */
mp->mp_reply.procnr = who;
}
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return(OK);
}
/*=====================================================================*
* do_reboot *
*=====================================================================*/
#define REBOOT_CODE "delay; boot"
PUBLIC int do_reboot()
{
char monitor_code[32*sizeof(char *)];
int code_len;
int abort_flag;
if (mp->mp_effuid != SUPER_USER) return(EPERM);
switch (m_in.reboot_flag) {
case RBT_HALT:
case RBT_PANIC:
case RBT_RESET:
abort_flag = m_in.reboot_flag;
break;
case RBT_REBOOT:
code_len = strlen(REBOOT_CODE) + 1;
strncpy(monitor_code, REBOOT_CODE, code_len);
abort_flag = RBT_MONITOR;
break;
case RBT_MONITOR:
code_len = m_in.reboot_strlen + 1;
if (code_len > sizeof(monitor_code)) return(EINVAL);
if (sys_datacopy(who, (vir_bytes) m_in.reboot_code,
PM_PROC_NR, (vir_bytes) monitor_code,
(phys_bytes) (code_len)) != OK) return(EFAULT);
if (monitor_code[code_len-1] != 0) return(EINVAL);
abort_flag = RBT_MONITOR;
break;
default:
return(EINVAL);
}
tell_fs(REBOOT,0,0,0); /* tell FS to prepare for shutdown */
check_sig(-1, SIGKILL); /* kill all processes except init */
/* Ask the kernel to abort. All system services, including the PM, will
* get a HARD_STOP notification. Await the notification in the main loop.
*/
sys_abort(abort_flag, PM_PROC_NR, monitor_code, code_len);
return(SUSPEND); /* don't reply to killed process */
}
/*=====================================================================*
* do_getsetpriority *
*=====================================================================*/
PUBLIC int do_getsetpriority()
{
int arg_which, arg_who, arg_pri;
int rmp_nr;
struct mproc *rmp;
arg_which = m_in.m1_i1;
arg_who = m_in.m1_i2;
arg_pri = m_in.m1_i3; /* for SETPRIORITY */
/* Code common to GETPRIORITY and SETPRIORITY. */
/* Only support PRIO_PROCESS for now. */
if(arg_which != PRIO_PROCESS)
return EINVAL;
if(arg_who == 0)
rmp_nr = who;
else
if((rmp_nr = proc_from_pid(arg_who)) < 0)
return ESRCH;
rmp = &mproc[rmp_nr];
if(mp->mp_effuid != SUPER_USER &&
mp->mp_effuid != rmp->mp_effuid && mp->mp_effuid != rmp->mp_realuid)
return EPERM;
/* If GET, that's it. */
if(call_nr == GETPRIORITY) {
return rmp->mp_nice - PRIO_MIN;
}
/* Only root is allowed to reduce the nice level. */
if(rmp->mp_nice > arg_pri && mp->mp_effuid != SUPER_USER)
return EACCES;
/* We're SET, and it's allowed. Do it and tell kernel. */
rmp->mp_nice = arg_pri;
return sys_setpriority(rmp_nr, arg_pri);
}
/*=====================================================================*
* do_svrctl *
*=====================================================================*/
PUBLIC int do_svrctl()
{
int s, req;
vir_bytes ptr;
req = m_in.svrctl_req;
ptr = (vir_bytes) m_in.svrctl_argp;
/* Is the request for the kernel? Forward it, except for SYSGETENV. */
if (((req >> 8) & 0xFF) == 'S') {
/* Binary compatibility check. */
if (req == SYSGETENV) {
printf("SYSGETENV by %d (fix!)\n", who);
req = MMGETPARAM;
}
else
/* Simply forward call to the SYSTEM task. */
return(sys_svrctl(who, req, mp->mp_effuid == SUPER_USER, ptr));
}
/* Control operations local to the PM. */
switch(req) {
case MMGETPARAM: {
struct sysgetenv sysgetenv;
char search_key[64];
char *val_start;
size_t val_len;
size_t copy_len;
/* Copy sysgetenv structure to PM. */
if (sys_datacopy(who, ptr, SELF, (vir_bytes) &sysgetenv,
sizeof(sysgetenv)) != OK) return(EFAULT);
if (sysgetenv.keylen == 0) { /* copy all parameters */
val_start = monitor_params;
val_len = sizeof(monitor_params);
}
else { /* lookup value for key */
/* Try to get a copy of the requested key. */
if (sysgetenv.keylen > sizeof(search_key)) return(EINVAL);
if ((s = sys_datacopy(who, (vir_bytes) sysgetenv.key,
SELF, (vir_bytes) search_key, sysgetenv.keylen)) != OK)
return(s);
/* Make sure key is null-terminated and lookup value. */
search_key[sysgetenv.keylen-1]= '\0';
if ((val_start = find_param(search_key)) == NULL)
return(ESRCH);
val_len = strlen(val_start) + 1;
}
/* See if it fits in the client's buffer. */
if (val_len > sysgetenv.vallen)
return E2BIG;
/* Value found, make the actual copy (as far as possible). */
copy_len = MIN(val_len, sysgetenv.vallen);
if ((s=sys_datacopy(SELF, (vir_bytes) val_start,
who, (vir_bytes) sysgetenv.val, copy_len)) != OK)
return(s);
return OK;
}
case MMSIGNON: {
/* A user process becomes a task. Simulate an exit by
* releasing a waiting parent and disinheriting children.
*/
struct mproc *rmp;
pid_t pidarg;
if (mp->mp_effuid != SUPER_USER) return(EPERM);
rmp = &mproc[mp->mp_parent];
tell_fs(EXIT, who, 0, 0);
pidarg = rmp->mp_wpid;
if ((rmp->mp_flags & WAITING) && (pidarg == -1
|| pidarg == mp->mp_pid || -pidarg == mp->mp_procgrp))
{
/* Wake up the parent. */
rmp->mp_reply.reply_res2 = 0;
setreply(mp->mp_parent, mp->mp_pid);
rmp->mp_flags &= ~WAITING;
}
/* Disinherit children. */
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
if ((rmp->mp_flags & IN_USE) && rmp->mp_parent == who) {
rmp->mp_parent = INIT_PROC_NR;
}
}
/* Become like PM and FS. */
mp->mp_pid = mp->mp_procgrp = 0;
mp->mp_parent = 0;
return(OK); }
#if ENABLE_SWAP
case MMSWAPON: {
struct mmswapon swapon;
if (mp->mp_effuid != SUPER_USER) return(EPERM);
if (sys_datacopy(who, (phys_bytes) ptr,
PM_PROC_NR, (phys_bytes) &swapon,
(phys_bytes) sizeof(swapon)) != OK) return(EFAULT);
return(swap_on(swapon.file, swapon.offset, swapon.size)); }
case MMSWAPOFF: {
if (mp->mp_effuid != SUPER_USER) return(EPERM);
return(swap_off()); }
#endif /* SWAP */
default:
return(EINVAL);
}
}