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. new kernel call sysctl for generic unprivileged system operations;

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now used for printing diagnostic messages through the kernel message
   buffer. this lets processes print diagnostics without sending messages
   to tty and log directly, simplifying the message protocol a lot and
   reducing difficulties with deadlocks and other situations in which
   diagnostics are blackholed (e.g. grants don't work). this makes
   DIAGNOSTICS(_S), ASYN_DIAGNOSTICS and DIAG_REPL obsolete, although tty
   and log still accept the codes for 'old' binaries. This also simplifies
   diagnostics in several servers and drivers - only tty needs its own
   kputc() now.
 . simplifications in vfs, and some effort to get the vnode references
   right (consistent) even during shutdown. m_mounted_on is now NULL
   for root filesystems (!) (the original and new root), a less awkward
   special case than 'm_mounted_on == m_root_node'. root now has exactly
   one reference, to root, if no files are open, just like all other
   filesystems. m_driver_e is unused.
This commit is contained in:
Ben Gras
2009-01-26 17:43:59 +00:00
parent 4984a86f32
commit 3cc092ff06
38 changed files with 243 additions and 531 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/system/Makefile
View File

@@ -43,6 +43,7 @@ OBJECTS = \
$(SYSTEM)(do_privctl.o) \
$(SYSTEM)(do_segctl.o) \
$(SYSTEM)(do_safecopy.o) \
$(SYSTEM)(do_sysctl.o) \
$(SYSTEM)(do_getksig.o) \
$(SYSTEM)(do_endksig.o) \
$(SYSTEM)(do_kill.o) \
@@ -151,6 +152,9 @@ $(SYSTEM)(do_privctl.o): do_privctl.c
$(SYSTEM)(do_safecopy.o): do_safecopy.c
$(CC) do_safecopy.c
$(SYSTEM)(do_sysctl.o): do_sysctl.c
$(CC) do_sysctl.c
$(SYSTEM)(do_segctl.o): do_segctl.c
$(CC) do_segctl.c

58
kernel/system/do_sysctl.c Normal file
View File

@@ -0,0 +1,58 @@
/* 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"
#include "../vm.h"
/*===========================================================================*
* do_sysctl *
*===========================================================================*/
PUBLIC int do_sysctl(m_ptr)
register message *m_ptr; /* pointer to request message */
{
phys_bytes ph;
vir_bytes len, buf;
static char mybuf[DIAG_BUFSIZE];
struct proc *caller;
int s, i;
caller = proc_addr(who_p);
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((ph=umap_local(caller, D, buf, len)) == 0)
return EFAULT;
CHECKRANGE_OR_SUSPEND(caller, ph, len, 1);
if((s=data_copy(who_e, 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;
break;
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);
}