Extend the support for exempting processes from being killed when swap is

exhausted.
- Add a new protect(1) command that can be used to set or revoke protection
  from arbitrary processes.  Similar to ktrace it can apply a change to all
  existing descendants of a process as well as future descendants.
- Add a new procctl(2) system call that provides a generic interface for
  control operations on processes (as opposed to the debugger-specific
  operations provided by ptrace(2)).  procctl(2) uses a combination of
  idtype_t and an id to identify the set of processes on which to operate
  similar to wait6().
- Add a PROC_SPROTECT control operation to manage the protection status
  of a set of processes.  MADV_PROTECT still works for backwards
  compatability.
- Add a p_flag2 to struct proc (and a corresponding ki_flag2 to kinfo_proc)
  the first bit of which is used to track if P_PROTECT should be inherited
  by new child processes.

Reviewed by:	kib, jilles (earlier version)
Approved by:	re (delphij)
MFC after:	1 month

2 files changed, 14 insertions, 0 deletions

diff --git a/usr.bin/kdump/kdump.c b/usr.bin/kdump/kdump.c
index c49b45b..e3e6927 100644
--- a/usr.bin/kdump/kdump.c
+++ b/usr.bin/kdump/kdump.c
@@ -1161,6 +1161,18 @@ ktrsyscall(struct ktr_syscall *ktr, u_int flags)
 				ip++;
 				narg--;
 				break;
+			case SYS_procctl:
+				putchar('(');
+				idtypename(*ip, decimal);
+				c = ',';
+				ip++;
+				narg--;
+				print_number(ip, narg, c);
+				putchar(',');
+				procctlcmdname(*ip);
+				ip++;
+				narg--;
+				break;
 			}
 		}
 		while (narg > 0) {
diff --git a/usr.bin/kdump/mksubr b/usr.bin/kdump/mksubr
index 7fd42b7..1859086 100644
--- a/usr.bin/kdump/mksubr
+++ b/usr.bin/kdump/mksubr
@@ -169,6 +169,7 @@ cat <<_EOF_
 #include <netinet/in.h>
 #include <sys/param.h>
 #include <sys/mount.h>
+#include <sys/procctl.h>
 #include <sys/ptrace.h>
 #include <sys/resource.h>
 #include <sys/reboot.h>
@@ -465,6 +466,7 @@ auto_or_type     "mountflagsname"      "MNT_[A-Z]+[[:space:]]+0x[0-9]+"
 auto_switch_type "msyncflagsname"      "MS_[A-Z]+[[:space:]]+0x[0-9]+"                "sys/mman.h"
 auto_or_type     "nfssvcname"          "NFSSVC_[A-Z0-9]+[[:space:]]+0x[0-9]+"            "nfs/nfssvc.h"
 auto_switch_type "prioname"            "PRIO_[A-Z]+[[:space:]]+[0-9]"                 "sys/resource.h"
+auto_switch_type "procctlcmdname"      "PROC_[A-Z]+[[:space:]]+[0-9]"                 "sys/procctl.h"
 auto_switch_type "ptraceopname"        "PT_[[:alnum:]_]+[[:space:]]+[0-9]+"           "sys/ptrace.h"
 auto_switch_type "quotactlname"        "Q_[A-Z]+[[:space:]]+0x[0-9]+"                 "ufs/ufs/quota.h"
 auto_or_type     "rebootoptname"       "RB_[A-Z]+[[:space:]]+0x[0-9]+"                "sys/reboot.h"