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proc.h: Add PHOLD()/PRELE() macros to ensure the U area is not swapped

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while doing ptrace/procfs in it.
ptrace.h: uncomment PT_ATTACH/PT_DETACH, I am committing code to do this.
This commit is contained in:
Peter Wemm 1996-01-24 18:11:23 +00:00
parent 1f8d3d7485
commit bf5bfe45ab
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=13606
2 changed files with 9 additions and 4 deletions
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9
sys/sys/proc.h
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)proc.h 8.8 (Berkeley) 1/21/94
* $Id: proc.h,v 1.17 1995/03/16 18:16:22 bde Exp $
* $Id: proc.h,v 1.18 1995/07/13 08:48:03 davidg Exp $
*/
#ifndef _SYS_PROC_H_
@ -234,6 +234,13 @@ struct pcred {
FREE(s, M_SESSION); \
}
/* hold process U-area in memory, normally for ptrace/procfs work */
#define PHOLD(p) { \
if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) \
faultin(p); \
}
#define PRELE(p) (--(p)->p_lock)
extern struct proc *pidhash[]; /* In param.c. */
extern struct pgrp *pgrphash[]; /* In param.c. */
extern struct proc *curproc; /* Current running proc. */

4
sys/sys/ptrace.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)ptrace.h 8.2 (Berkeley) 1/4/94
* $Id: ptrace.h,v 1.3 1994/08/08 13:00:27 davidg Exp $
* $Id: ptrace.h,v 1.4 1995/03/16 18:16:23 bde Exp $
*/
#ifndef _SYS_PTRACE_H_
@ -48,10 +48,8 @@
#define PT_KILL 8 /* kill the child process */
#define PT_STEP 9 /* single step the child */
#ifdef notdef
#define PT_ATTACH 10 /* trace some running process */
#define PT_DETACH 11 /* stop tracing a process */
#endif
#define PT_FIRSTMACH 32 /* for machine-specific requests */
#include <machine/ptrace.h> /* machine-specific requests, if any */