374 lines
11 KiB
C
374 lines
11 KiB
C
/* Miscellaneous system calls. Author: Kees J. Bot
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* 31 Mar 2000
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* The entry points into this file are:
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* do_reboot: kill all processes, then reboot system
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* do_svrctl: process manager control
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* do_getsysinfo: request copy of PM data structure (Jorrit N. Herder)
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* do_getprocnr: lookup process slot number (Jorrit N. Herder)
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* do_memalloc: allocate a chunk of memory (Jorrit N. Herder)
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* do_memfree: deallocate a chunk of memory (Jorrit N. Herder)
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* do_getsetpriority: get/set process priority
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*/
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#include "pm.h"
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#include <minix/callnr.h>
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#include <signal.h>
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#include <sys/svrctl.h>
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#include <sys/resource.h>
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#include <minix/com.h>
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#include <string.h>
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#include "mproc.h"
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#include "param.h"
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/*===========================================================================*
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* do_allocmem *
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*===========================================================================*/
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PUBLIC int do_allocmem()
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{
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vir_clicks mem_clicks;
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phys_clicks mem_base;
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mem_clicks = (m_in.memsize + CLICK_SIZE -1 ) >> CLICK_SHIFT;
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mem_base = alloc_mem(mem_clicks);
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if (mem_base == NO_MEM) return(ENOMEM);
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mp->mp_reply.membase = (phys_bytes) (mem_base << CLICK_SHIFT);
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return(OK);
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}
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/*===========================================================================*
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* do_freemem *
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*===========================================================================*/
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PUBLIC int do_freemem()
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{
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vir_clicks mem_clicks;
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phys_clicks mem_base;
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mem_clicks = (m_in.memsize + CLICK_SIZE -1 ) >> CLICK_SHIFT;
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mem_base = (m_in.membase + CLICK_SIZE -1 ) >> CLICK_SHIFT;
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free_mem(mem_base, mem_clicks);
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return(OK);
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}
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/*===========================================================================*
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* do_getsysinfo *
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*===========================================================================*/
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PUBLIC int do_getsysinfo()
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{
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struct mproc *proc_addr;
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vir_bytes src_addr, dst_addr;
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struct kinfo kinfo;
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size_t len;
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int s;
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switch(m_in.info_what) {
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case SI_KINFO: /* kernel info is obtained via PM */
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sys_getkinfo(&kinfo);
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src_addr = (vir_bytes) &kinfo;
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len = sizeof(struct kinfo);
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break;
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case SI_PROC_ADDR: /* get address of PM process table */
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proc_addr = &mproc[0];
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src_addr = (vir_bytes) &proc_addr;
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len = sizeof(struct mproc *);
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break;
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case SI_PROC_TAB: /* copy entire process table */
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src_addr = (vir_bytes) mproc;
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len = sizeof(struct mproc) * NR_PROCS;
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break;
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default:
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return(EINVAL);
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}
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dst_addr = (vir_bytes) m_in.info_where;
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if (OK != (s=sys_datacopy(SELF, src_addr, who, dst_addr, len)))
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return(s);
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return(OK);
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}
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/*===========================================================================*
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* do_getprocnr *
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*===========================================================================*/
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PUBLIC int do_getprocnr()
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{
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register struct mproc *rmp;
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static char search_key[PROC_NAME_LEN+1];
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int key_len;
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int s;
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if (m_in.namelen > 0) { /* lookup process by name */
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key_len = MIN(m_in.namelen, PROC_NAME_LEN);
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if (OK != (s=sys_datacopy(who, (vir_bytes) m_in.addr,
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SELF, (vir_bytes) search_key, key_len)))
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return(s);
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search_key[key_len] = '\0'; /* terminate for safety */
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
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if ((rmp->mp_flags & IN_USE) &&
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strncmp(rmp->mp_name, search_key, key_len)==0) {
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mp->mp_reply.procnr = (int) (rmp - mproc);
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return(OK);
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}
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}
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return(ESRCH);
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}
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else { /* return own process number */
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mp->mp_reply.procnr = who;
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}
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return(OK);
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}
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/*=====================================================================*
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* do_reboot *
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*=====================================================================*/
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#define REBOOT_CODE "delay; boot"
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PUBLIC int do_reboot()
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{
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char monitor_code[32*sizeof(char *)];
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int code_len;
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int abort_flag;
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if (mp->mp_effuid != SUPER_USER) return(EPERM);
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switch (m_in.reboot_flag) {
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case RBT_HALT:
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case RBT_PANIC:
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case RBT_RESET:
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abort_flag = m_in.reboot_flag;
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break;
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case RBT_REBOOT:
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code_len = strlen(REBOOT_CODE) + 1;
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strncpy(monitor_code, REBOOT_CODE, code_len);
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abort_flag = RBT_MONITOR;
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break;
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case RBT_MONITOR:
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code_len = m_in.reboot_strlen + 1;
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if (code_len > sizeof(monitor_code)) return(EINVAL);
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if (sys_datacopy(who, (vir_bytes) m_in.reboot_code,
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PM_PROC_NR, (vir_bytes) monitor_code,
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(phys_bytes) (code_len)) != OK) return(EFAULT);
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if (monitor_code[code_len-1] != 0) return(EINVAL);
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abort_flag = RBT_MONITOR;
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break;
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default:
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return(EINVAL);
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}
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tell_fs(REBOOT,0,0,0); /* tell FS to prepare for shutdown */
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check_sig(-1, SIGKILL); /* kill all processes except init */
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/* Ask the kernel to abort. All system services, including the PM, will
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* get a HARD_STOP notification. Await the notification in the main loop.
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*/
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sys_abort(abort_flag, PM_PROC_NR, monitor_code, code_len);
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return(SUSPEND); /* don't reply to killed process */
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}
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/*=====================================================================*
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* do_getsetpriority *
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*=====================================================================*/
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PUBLIC int do_getsetpriority()
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{
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int arg_which, arg_who, arg_pri;
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int rmp_nr;
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struct mproc *rmp;
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arg_which = m_in.m1_i1;
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arg_who = m_in.m1_i2;
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arg_pri = m_in.m1_i3; /* for SETPRIORITY */
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/* Code common to GETPRIORITY and SETPRIORITY. */
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/* Only support PRIO_PROCESS for now. */
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if(arg_which != PRIO_PROCESS)
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return(EINVAL);
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if(arg_who == 0)
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rmp_nr = who;
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else
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if((rmp_nr = proc_from_pid(arg_who)) < 0)
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return(ESRCH);
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rmp = &mproc[rmp_nr];
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if(mp->mp_effuid != SUPER_USER &&
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mp->mp_effuid != rmp->mp_effuid && mp->mp_effuid != rmp->mp_realuid)
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return EPERM;
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/* If GET, that's it. */
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if(call_nr == GETPRIORITY) {
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return(rmp->mp_nice - PRIO_MIN);
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}
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/* Only root is allowed to reduce the nice level. */
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if(rmp->mp_nice > arg_pri && mp->mp_effuid != SUPER_USER)
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return(EACCES);
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/* We're SET, and it's allowed. Do it and tell kernel. */
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rmp->mp_nice = arg_pri;
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return sys_nice(rmp_nr, arg_pri);
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}
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/*=====================================================================*
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* do_svrctl *
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*=====================================================================*/
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PUBLIC int do_svrctl()
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{
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int s, req;
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vir_bytes ptr;
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#define MAX_LOCAL_PARAMS 2
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static struct {
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char name[30];
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char value[30];
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} local_param_overrides[MAX_LOCAL_PARAMS];
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static int local_params = 0;
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req = m_in.svrctl_req;
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ptr = (vir_bytes) m_in.svrctl_argp;
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/* Is the request for the kernel? Forward it, except for SYSGETENV. */
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if (((req >> 8) & 0xFF) == 'S') {
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/* Binary compatibility check. */
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if (req == SYSGETENV) {
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printf("SYSGETENV by %d (fix!)\n", who);
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req = MMGETPARAM;
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}
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else
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/* Simply forward call to the SYSTEM task. */
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return(sys_svrctl(who, req, mp->mp_effuid == SUPER_USER, ptr));
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}
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/* Control operations local to the PM. */
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switch(req) {
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case MMSETPARAM:
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case MMGETPARAM: {
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struct sysgetenv sysgetenv;
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char search_key[64];
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char *val_start;
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size_t val_len;
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size_t copy_len;
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/* Copy sysgetenv structure to PM. */
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if (sys_datacopy(who, ptr, SELF, (vir_bytes) &sysgetenv,
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sizeof(sysgetenv)) != OK) return(EFAULT);
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/* Set a param override? */
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if(req == MMSETPARAM) {
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if(local_params >= MAX_LOCAL_PARAMS) return ENOSPC;
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if(sysgetenv.keylen <= 0 || sysgetenv.keylen >= sizeof(local_param_overrides[local_params].name)
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|| sysgetenv.vallen <= 0 || sysgetenv.vallen >= sizeof(local_param_overrides[local_params].value))
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return EINVAL;
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if ((s = sys_datacopy(who, (vir_bytes) sysgetenv.key,
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SELF, (vir_bytes) local_param_overrides[local_params].name,
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sysgetenv.keylen)) != OK)
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return s;
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if ((s = sys_datacopy(who, (vir_bytes) sysgetenv.val,
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SELF, (vir_bytes) local_param_overrides[local_params].value,
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sysgetenv.keylen)) != OK)
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return s;
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local_param_overrides[local_params].name[sysgetenv.keylen] = '\0';
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local_param_overrides[local_params].value[sysgetenv.vallen] = '\0';
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local_params++;
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return OK;
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}
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if (sysgetenv.keylen == 0) { /* copy all parameters */
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val_start = monitor_params;
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val_len = sizeof(monitor_params);
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}
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else { /* lookup value for key */
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int p;
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/* Try to get a copy of the requested key. */
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if (sysgetenv.keylen > sizeof(search_key)) return(EINVAL);
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if ((s = sys_datacopy(who, (vir_bytes) sysgetenv.key,
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SELF, (vir_bytes) search_key, sysgetenv.keylen)) != OK)
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return(s);
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/* Make sure key is null-terminated and lookup value.
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* First check local overrides.
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*/
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search_key[sysgetenv.keylen-1]= '\0';
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for(p = 0; p < local_params; p++) {
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if(!strcmp(search_key, local_param_overrides[p].name)) {
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val_start = local_param_overrides[p].value;
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break;
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}
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}
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if(p >= local_params && (val_start = find_param(search_key)) == NULL)
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return(ESRCH);
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val_len = strlen(val_start) + 1;
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}
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/* See if it fits in the client's buffer. */
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if (val_len > sysgetenv.vallen)
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return E2BIG;
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/* Value found, make the actual copy (as far as possible). */
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copy_len = MIN(val_len, sysgetenv.vallen);
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if ((s=sys_datacopy(SELF, (vir_bytes) val_start,
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who, (vir_bytes) sysgetenv.val, copy_len)) != OK)
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return(s);
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return OK;
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}
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case MMSIGNON: {
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#if DEAD_CODE
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/* A user process becomes a task. Simulate an exit by
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* releasing a waiting parent and disinheriting children.
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*/
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struct mproc *rmp;
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pid_t pidarg;
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if (mp->mp_effuid != SUPER_USER) return(EPERM);
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rmp = &mproc[mp->mp_parent];
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tell_fs(EXIT, who, 0, 0);
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pidarg = rmp->mp_wpid;
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if ((rmp->mp_flags & WAITING) && (pidarg == -1
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|| pidarg == mp->mp_pid || -pidarg == mp->mp_procgrp))
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{
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/* Wake up the parent. */
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rmp->mp_reply.reply_res2 = 0;
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setreply(mp->mp_parent, mp->mp_pid);
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rmp->mp_flags &= ~WAITING;
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}
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/* Disinherit children. */
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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_parent == who) {
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rmp->mp_parent = INIT_PROC_NR;
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}
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}
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#endif
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return(OK); }
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#if ENABLE_SWAP
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case MMSWAPON: {
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struct mmswapon swapon;
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if (mp->mp_effuid != SUPER_USER) return(EPERM);
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if (sys_datacopy(who, (phys_bytes) ptr,
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PM_PROC_NR, (phys_bytes) &swapon,
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(phys_bytes) sizeof(swapon)) != OK) return(EFAULT);
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return(swap_on(swapon.file, swapon.offset, swapon.size)); }
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case MMSWAPOFF: {
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if (mp->mp_effuid != SUPER_USER) return(EPERM);
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return(swap_off()); }
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#endif /* SWAP */
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default:
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return(EINVAL);
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}
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}
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