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minix/servers/pm/misc.c
Tomas Hruby 6e25ad8b0a Use of all NIL_* defines converted to NULL
2010-05-10 13:26:00 +00:00

632 lines
18 KiB
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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_procstat: request process status (Jorrit N. Herder)
* do_getsysinfo: request copy of PM data structure (Jorrit N. Herder)
* do_getprocnr: lookup process slot number (Jorrit N. Herder)
* do_getepinfo: get the pid/uid/gid of a process given its endpoint
* do_getsetpriority: get/set process priority
* do_svrctl: process manager control
*/
#define brk _brk
#include "pm.h"
#include <minix/callnr.h>
#include <signal.h>
#include <sys/svrctl.h>
#include <sys/resource.h>
#include <sys/utsname.h>
#include <minix/com.h>
#include <minix/config.h>
#include <minix/sysinfo.h>
#include <minix/type.h>
#include <minix/vm.h>
#include <string.h>
#include <machine/archtypes.h>
#include <lib.h>
#include <assert.h>
#include "mproc.h"
#include "param.h"
#include "kernel/proc.h"
PUBLIC struct utsname uts_val = {
"Minix", /* system name */
"noname", /* node/network name */
OS_RELEASE, /* O.S. release (e.g. 1.5) */
OS_VERSION, /* O.S. version (e.g. 10) */
"xyzzy", /* machine (cpu) type (filled in later) */
#if __i386
"i386", /* architecture */
#else
#error /* oops, no 'uname -mk' */
#endif
};
PRIVATE char *uts_tbl[] = {
uts_val.arch,
NULL, /* No kernel architecture */
uts_val.machine,
NULL, /* No hostname */
uts_val.nodename,
uts_val.release,
uts_val.version,
uts_val.sysname,
NULL, /* No bus */ /* No bus */
};
#if ENABLE_SYSCALL_STATS
PUBLIC unsigned long calls_stats[NCALLS];
#endif
FORWARD _PROTOTYPE( int getpciinfo, (struct pciinfo *pciinfo) );
/*===========================================================================*
* do_procstat *
*===========================================================================*/
PUBLIC int do_procstat()
{
/* For the moment, this is only used to return pending signals to
* system processes that request the PM for their own status.
*
* Future use might include the FS requesting for process status of
* any user process.
*/
/* This call should be removed, or made more general. */
if (m_in.stat_nr == SELF) {
mp->mp_reply.sig_set = mp->mp_sigpending;
sigemptyset(&mp->mp_sigpending);
}
else {
return(ENOSYS);
}
return(OK);
}
/*===========================================================================*
* do_sysuname *
*===========================================================================*/
PUBLIC int do_sysuname()
{
/* Set or get uname strings. */
int r;
size_t n;
char *string;
#if 0 /* for updates */
char tmp[sizeof(uts_val.nodename)];
static short sizes[] = {
0, /* arch, (0 = read-only) */
0, /* kernel */
0, /* machine */
0, /* sizeof(uts_val.hostname), */
sizeof(uts_val.nodename),
0, /* release */
0, /* version */
0, /* sysname */
};
#endif
if ((unsigned) m_in.sysuname_field >= _UTS_MAX) return(EINVAL);
string = uts_tbl[m_in.sysuname_field];
if (string == NULL)
return EINVAL; /* Unsupported field */
switch (m_in.sysuname_req) {
case _UTS_GET:
/* Copy an uname string to the user. */
n = strlen(string) + 1;
if (n > m_in.sysuname_len) n = m_in.sysuname_len;
r = sys_vircopy(SELF, D, (phys_bytes) string,
mp->mp_endpoint, D, (phys_bytes) m_in.sysuname_value,
(phys_bytes) n);
if (r < 0) return(r);
break;
#if 0 /* no updates yet */
case _UTS_SET:
/* Set an uname string, needs root power. */
len = sizes[m_in.sysuname_field];
if (mp->mp_effuid != 0 || len == 0) return(EPERM);
n = len < m_in.sysuname_len ? len : m_in.sysuname_len;
if (n <= 0) return(EINVAL);
r = sys_vircopy(mp->mp_endpoint, D, (phys_bytes) m_in.sysuname_value,
SELF, D, (phys_bytes) tmp, (phys_bytes) n);
if (r < 0) return(r);
tmp[n-1] = 0;
strcpy(string, tmp);
break;
#endif
default:
return(EINVAL);
}
/* Return the number of bytes moved. */
return(n);
}
/*===========================================================================*
* do_getsysinfo *
*===========================================================================*/
PUBLIC int do_getsysinfo()
{
struct mproc *proc_addr;
vir_bytes src_addr, dst_addr;
struct kinfo kinfo;
struct loadinfo loadinfo;
struct pciinfo pciinfo;
static struct proc proctab[NR_PROCS+NR_TASKS];
size_t len;
int s, r;
/* This call leaks important information (the contents of registers). */
if (mp->mp_effuid != 0)
{
printf("PM: unauthorized call of do_getsysinfo by proc %d '%s'\n",
mp->mp_endpoint, mp->mp_name);
sys_sysctl_stacktrace(mp->mp_endpoint);
return EPERM;
}
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;
case SI_KPROC_TAB: /* copy entire process table */
if((r=sys_getproctab(proctab)) != OK)
return r;
src_addr = (vir_bytes) proctab;
len = sizeof(proctab);
break;
case SI_LOADINFO: /* loadinfo is obtained via PM */
sys_getloadinfo(&loadinfo);
src_addr = (vir_bytes) &loadinfo;
len = sizeof(struct loadinfo);
break;
case SI_PCI_INFO: /* PCI info is obtained via PM */
if ((r=getpciinfo(&pciinfo)) != OK)
return r;
src_addr = (vir_bytes) &pciinfo;
len = sizeof(struct pciinfo);
break;
#if ENABLE_SYSCALL_STATS
case SI_CALL_STATS:
src_addr = (vir_bytes) calls_stats;
len = sizeof(calls_stats);
break;
#endif
default:
return(EINVAL);
}
dst_addr = (vir_bytes) m_in.info_where;
if (OK != (s=sys_datacopy(SELF, src_addr, who_e, dst_addr, len)))
return(s);
return(OK);
}
/*===========================================================================*
* do_getsysinfo_up *
*===========================================================================*/
PUBLIC int do_getsysinfo_up()
{
vir_bytes src_addr, dst_addr;
struct loadinfo loadinfo;
size_t len, real_len;
u64_t idle_tsc;
int s;
switch(m_in.SIU_WHAT) {
case SIU_LOADINFO: /* loadinfo is obtained via PM */
if ((s = sys_getloadinfo(&loadinfo)) != OK)
return s;
src_addr = (vir_bytes) &loadinfo;
real_len = sizeof(struct loadinfo);
break;
case SIU_SYSTEMHZ:
src_addr = (vir_bytes) &system_hz;
real_len = sizeof(system_hz);
break;
case SIU_IDLETSC:
if ((s = sys_getidletsc(&idle_tsc)) != OK)
return s;
src_addr = (vir_bytes) &idle_tsc;
real_len = sizeof(idle_tsc);
break;
default:
return(EINVAL);
}
/* Let application know what the length was. */
len = real_len;
if(len > m_in.SIU_LEN)
len = m_in.SIU_LEN;
dst_addr = (vir_bytes) m_in.SIU_WHERE;
if (OK != (s=sys_datacopy(SELF, src_addr, who_e, dst_addr, len)))
return(s);
return(real_len);
}
/*===========================================================================*
* do_getprocnr *
*===========================================================================*/
PUBLIC int do_getprocnr()
{
register struct mproc *rmp;
static char search_key[PROC_NAME_LEN+1];
int key_len;
int s;
/* This call should be moved to DS. */
if (mp->mp_effuid != 0)
{
/* For now, allow non-root processes to request their own endpoint. */
if (m_in.pid < 0 && m_in.namelen == 0) {
mp->mp_reply.PM_ENDPT = who_e;
mp->mp_reply.PM_PENDPT = NONE;
return OK;
}
printf("PM: unauthorized call of do_getprocnr by proc %d\n",
mp->mp_endpoint);
sys_sysctl_stacktrace(mp->mp_endpoint);
return EPERM;
}
#if 0
printf("PM: do_getprocnr(%d) call from endpoint %d, %s\n",
m_in.pid, mp->mp_endpoint, mp->mp_name);
#endif
if (m_in.pid >= 0) { /* lookup process by pid */
if ((rmp = find_proc(m_in.pid)) != NULL) {
mp->mp_reply.PM_ENDPT = rmp->mp_endpoint;
#if 0
printf("PM: pid result: %d\n", rmp->mp_endpoint);
#endif
return(OK);
}
return(ESRCH);
} else if (m_in.namelen > 0) { /* lookup process by name */
key_len = MIN(m_in.namelen, PROC_NAME_LEN);
if (OK != (s=sys_datacopy(who_e, (vir_bytes) m_in.PMBRK_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 | EXITING)) == IN_USE) &&
strncmp(rmp->mp_name, search_key, key_len)==0) {
mp->mp_reply.PM_ENDPT = rmp->mp_endpoint;
return(OK);
}
}
return(ESRCH);
} else { /* return own/parent process number */
#if 0
printf("PM: endpt result: %d\n", mp->mp_reply.PM_ENDPT);
#endif
mp->mp_reply.PM_ENDPT = who_e;
mp->mp_reply.PM_PENDPT = mproc[mp->mp_parent].mp_endpoint;
}
return(OK);
}
/*===========================================================================*
* do_getepinfo *
*===========================================================================*/
PUBLIC int do_getepinfo()
{
register struct mproc *rmp;
endpoint_t ep;
/* This call should be moved to DS. */
if (mp->mp_effuid != 0)
{
printf("PM: unauthorized call of do_getepinfo by proc %d\n",
mp->mp_endpoint);
sys_sysctl_stacktrace(mp->mp_endpoint);
return EPERM;
}
ep= m_in.PM_ENDPT;
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
if ((rmp->mp_flags & IN_USE) && (rmp->mp_endpoint == ep)) {
mp->mp_reply.reply_res2 = rmp->mp_effuid;
mp->mp_reply.reply_res3 = rmp->mp_effgid;
return(rmp->mp_pid);
}
}
/* Process not found */
return(ESRCH);
}
/*===========================================================================*
* do_reboot *
*===========================================================================*/
PUBLIC int do_reboot()
{
message m;
/* Check permission to abort the system. */
if (mp->mp_effuid != SUPER_USER) return(EPERM);
/* See how the system should be aborted. */
abort_flag = (unsigned) m_in.reboot_flag;
if (abort_flag >= RBT_INVALID) return(EINVAL);
if (RBT_MONITOR == abort_flag) {
int r;
if(m_in.reboot_strlen >= sizeof(monitor_code))
return EINVAL;
if((r = sys_datacopy(who_e, (vir_bytes) m_in.reboot_code,
SELF, (vir_bytes) monitor_code, m_in.reboot_strlen)) != OK)
return r;
monitor_code[m_in.reboot_strlen] = '\0';
}
else
monitor_code[0] = '\0';
/* Order matters here. When FS is told to reboot, it exits all its
* processes, and then would be confused if they're exited again by
* SIGKILL. So first kill, then reboot.
*/
check_sig(-1, SIGKILL, FALSE /* ksig*/); /* kill all users except init */
sys_stop(INIT_PROC_NR); /* stop init, but keep it around */
/* Tell FS to reboot */
m.m_type = PM_REBOOT;
tell_fs(&mproc[FS_PROC_NR], &m);
return(SUSPEND); /* don't reply to caller */
}
/*===========================================================================*
* do_getsetpriority *
*===========================================================================*/
PUBLIC int do_getsetpriority()
{
int r, arg_which, arg_who, arg_pri, new_q;
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 = mp;
else
if ((rmp = find_proc(arg_who)) == NULL)
return(ESRCH);
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.
*
* The value passed in is currently between PRIO_MIN and PRIO_MAX.
* We have to scale this between MIN_USER_Q and MAX_USER_Q to match
* the kernel's scheduling queues.
*
* TODO: This assumes that we are the scheduler, this will be changed
* once the scheduler gets factored out of PM to its own server
*/
if (arg_pri < PRIO_MIN || arg_pri > PRIO_MAX) return(EINVAL);
new_q = MAX_USER_Q + (arg_pri-PRIO_MIN) * (MIN_USER_Q-MAX_USER_Q+1) /
(PRIO_MAX-PRIO_MIN+1);
if (new_q < MAX_USER_Q) new_q = MAX_USER_Q; /* shouldn't happen */
if (new_q > MIN_USER_Q) new_q = MIN_USER_Q; /* shouldn't happen */
rmp->mp_max_priority = rmp->mp_priority = new_q;
if ((r = schedule_process(rmp)))
return(r);
rmp->mp_nice = arg_pri;
return(OK);
}
/*===========================================================================*
* do_svrctl *
*===========================================================================*/
PUBLIC int do_svrctl()
{
int s, req;
vir_bytes ptr;
#define MAX_LOCAL_PARAMS 2
static struct {
char name[30];
char value[30];
} local_param_overrides[MAX_LOCAL_PARAMS];
static int local_params = 0;
req = m_in.svrctl_req;
ptr = (vir_bytes) m_in.svrctl_argp;
/* Is the request indeed for the MM? */
if (((req >> 8) & 0xFF) != 'M') return(EINVAL);
/* Control operations local to the PM. */
switch(req) {
case MMSETPARAM:
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_e, ptr, SELF, (vir_bytes) &sysgetenv,
sizeof(sysgetenv)) != OK) return(EFAULT);
/* Set a param override? */
if (req == MMSETPARAM) {
if (local_params >= MAX_LOCAL_PARAMS) return ENOSPC;
if (sysgetenv.keylen <= 0
|| sysgetenv.keylen >=
sizeof(local_param_overrides[local_params].name)
|| sysgetenv.vallen <= 0
|| sysgetenv.vallen >=
sizeof(local_param_overrides[local_params].value))
return EINVAL;
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
SELF, (vir_bytes) local_param_overrides[local_params].name,
sysgetenv.keylen)) != OK)
return s;
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.val,
SELF, (vir_bytes) local_param_overrides[local_params].value,
sysgetenv.vallen)) != OK)
return s;
local_param_overrides[local_params].name[sysgetenv.keylen] = '\0';
local_param_overrides[local_params].value[sysgetenv.vallen] = '\0';
local_params++;
return OK;
}
if (sysgetenv.keylen == 0) { /* copy all parameters */
val_start = monitor_params;
val_len = sizeof(monitor_params);
}
else { /* lookup value for key */
int p;
/* Try to get a copy of the requested key. */
if (sysgetenv.keylen > sizeof(search_key)) return(EINVAL);
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
SELF, (vir_bytes) search_key, sysgetenv.keylen)) != OK)
return(s);
/* Make sure key is null-terminated and lookup value.
* First check local overrides.
*/
search_key[sysgetenv.keylen-1]= '\0';
for(p = 0; p < local_params; p++) {
if (!strcmp(search_key, local_param_overrides[p].name)) {
val_start = local_param_overrides[p].value;
break;
}
}
if (p >= local_params && (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_e, (vir_bytes) sysgetenv.val, copy_len)) != OK)
return(s);
return OK;
}
default:
return(EINVAL);
}
}
/*===========================================================================*
* _brk *
*===========================================================================*/
extern char *_brksize;
PUBLIC int brk(brk_addr)
char *brk_addr;
{
int r;
/* PM wants to call brk() itself. */
if((r=vm_brk(PM_PROC_NR, brk_addr)) != OK) {
#if 0
printf("PM: own brk(%p) failed: vm_brk() returned %d\n",
brk_addr, r);
#endif
return -1;
}
_brksize = brk_addr;
return 0;
}
/*===========================================================================*
* getpciinfo *
*===========================================================================*/
PRIVATE int getpciinfo(pciinfo)
struct pciinfo *pciinfo;
{
int devind, r;
struct pciinfo_entry *entry;
char *name;
u16_t vid, did;
/* look up PCI process number */
pci_init();
/* start enumerating devices */
entry = pciinfo->pi_entries;
r = pci_first_dev(&devind, &vid, &did);
while (r)
{
/* fetch device name */
name = pci_dev_name(vid, did);
if (!name)
name = "";
/* store device information in table */
assert((char *) entry < (char *) (pciinfo + 1));
entry->pie_vid = vid;
entry->pie_did = did;
strncpy(entry->pie_name, name, sizeof(entry->pie_name));
entry->pie_name[sizeof(entry->pie_name) - 1] = 0;
entry++;
/* continue with the next device */
r = pci_next_dev(&devind, &vid, &did);
}
/* store number of entries */
pciinfo->pi_count = entry - pciinfo->pi_entries;
return OK;
}
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