minix/kernel/system/do_sysctl.c

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/* The kernel call implemented in this file:
* m_type: SYS_SYSCTL
*
* The parameters for this kernel call are:
* SYSCTL_CODE request
* and then request-specific arguments in SYSCTL_ARG1 and SYSCTL_ARG2.
*/
#include "../system.h"
/*===========================================================================*
* do_sysctl *
*===========================================================================*/
PUBLIC int do_sysctl(struct proc * caller, message * m_ptr)
{
vir_bytes len, buf;
static char mybuf[DIAG_BUFSIZE];
int s, i, proc_nr;
switch (m_ptr->SYSCTL_CODE) {
case SYSCTL_CODE_DIAG:
buf = (vir_bytes) m_ptr->SYSCTL_ARG1;
len = (vir_bytes) m_ptr->SYSCTL_ARG2;
if(len < 1 || len > DIAG_BUFSIZE) {
kprintf("do_sysctl: diag for %d: len %d out of range\n",
caller->p_endpoint, len);
return EINVAL;
}
if((s=data_copy_vmcheck(caller, caller->p_endpoint, buf, SYSTEM,
(vir_bytes) mybuf, len)) != OK) {
kprintf("do_sysctl: diag for %d: len %d: copy failed: %d\n",
caller->p_endpoint, len, s);
return s;
}
for(i = 0; i < len; i++)
kputc(mybuf[i]);
kputc(END_OF_KMESS);
return OK;
case SYSCTL_CODE_STACKTRACE:
if(!isokendpt(m_ptr->SYSCTL_ARG2, &proc_nr))
return EINVAL;
proc_stacktrace(proc_addr(proc_nr));
return OK;
default:
kprintf("do_sysctl: invalid request %d\n", m_ptr->SYSCTL_CODE);
return(EINVAL);
}
minix_panic("do_sysctl: can't happen", NO_NUM);
return(OK);
}