kernel/system/do_sysctl.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_SYSCTL
   3  *
   4  * The parameters for this kernel call are:
   5  *      SYSCTL_CODE     request
   6  * and then request-specific arguments in SYSCTL_ARG1 and SYSCTL_ARG2.
   7  */
   8
   9 #include "kernel/system.h"
  10
  11
  12 /*===========================================================================*
  13  *                              do_sysctl                                    *
  14  *===========================================================================*/
  15 int do_sysctl(struct proc * caller, message * m_ptr)
  16 {
  17   vir_bytes len, buf;
  18   static char mybuf[DIAG_BUFSIZE];
  19   int s, i, proc_nr;
  20
  21   switch (m_ptr->SYSCTL_CODE) {
  22     case SYSCTL_CODE_DIAG:
  23         buf = (vir_bytes) m_ptr->SYSCTL_ARG1;
  24         len = (vir_bytes) m_ptr->SYSCTL_ARG2;
  25         if(len < 1 || len > DIAG_BUFSIZE) {
  26                 printf("do_sysctl: diag for %d: len %d out of range\n",
  27                         caller->p_endpoint, len);
  28                 return EINVAL;
  29         }
  30         if((s=data_copy_vmcheck(caller, caller->p_endpoint, buf, KERNEL,
  31                                         (vir_bytes) mybuf, len)) != OK) {
  32                 printf("do_sysctl: diag for %d: len %d: copy failed: %d\n",
  33                         caller->p_endpoint, len, s);
  34                 return s;
  35         }
  36         for(i = 0; i < len; i++)
  37                 kputc(mybuf[i]);
  38         kputc(END_OF_KMESS);
  39         return OK;
  40     case SYSCTL_CODE_STACKTRACE:
  41         if(!isokendpt(m_ptr->SYSCTL_ARG2, &proc_nr))
  42                 return EINVAL;
  43         proc_stacktrace(proc_addr(proc_nr));
  44         return OK;
  45     default:
  46         printf("do_sysctl: invalid request %d\n", m_ptr->SYSCTL_CODE);
  47         return(EINVAL);
  48   }
  49 }
  50