library function to retrieve kernel proc table and sanity check it

include/minix/const.h

@@ -187,4 +187,7 @@
 #define VERBOSEBOOT_MAX   3
 #define VERBOSEBOOTVARNAME "verbose"
 
+/* magic value to put in struct proc entries for sanity checks. */
+#define PMAGIC 0xC0FFEE1
+
 #endif /* _MINIX_CONST_H */

include/minix/sysinfo.h

@@ -6,6 +6,7 @@
 #include <minix/type.h>
 
 _PROTOTYPE( int getsysinfo, (endpoint_t who, int what, void *where)       );
+_PROTOTYPE( int minix_getkproctab, (void *pr, int nprocs, int assert));
 _PROTOTYPE( ssize_t getsysinfo_up, (endpoint_t who, int what, size_t size,
 	void *where));
 

kernel/proc.h

@@ -1,6 +1,8 @@
 #ifndef PROC_H
 #define PROC_H
 
+#include <minix/const.h>
+
 #ifndef __ASSEMBLY__
 
 /* Here is the declaration of the process table.  It contains all process
@@ -102,7 +104,6 @@ struct proc {
   } p_vmrequest;
 
   int p_found;	/* consistency checking variables */
-#define PMAGIC 0xC0FFEE1
   int p_magic;		/* check validity of proc pointers */
 
 #if DEBUG_TRACE

lib/libc/other/_getsysinfo.c

@@ -1,9 +1,23 @@
+
 #include <lib.h>
+#include <unistd.h>
+#include <timers.h>
 #include <minix/endpoint.h>
 #define getsysinfo	_getsysinfo
 #define getsysinfo_up	_getsysinfo_up
 #include <minix/sysinfo.h>
+#include <minix/const.h>
 
+#include <minix/ipc.h>
+#include <minix/com.h>
+#include <minix/sysinfo.h>
+#include <minix/config.h>
+#include <minix/type.h>
+#include <minix/const.h>
+#include <stdio.h>
+
+#include <machine/archtypes.h>
+#include "../../../kernel/proc.h"
 
 PUBLIC int getsysinfo(who, what, where)
 endpoint_t who;			/* from whom to request info */
@@ -17,6 +31,35 @@ void *where;			/* where to put it */
   return(0);
 }
 
+PUBLIC int minix_getkproctab(void *vpr, int nprocs, int assert)
+{
+	int r, i, fail = 0;
+	struct proc *pr = vpr;
+
+	if((r=getsysinfo(PM_PROC_NR, SI_KPROC_TAB, pr)) < 0)
+		return r;
+
+	for(i = 0; i < nprocs; i++) {
+		if(pr[i].p_magic != PMAGIC) {
+			fail = 1;
+			break;
+		}
+	}
+
+	if(!fail)
+		return 0;
+
+	if(assert) {
+		fprintf(stderr, "%s: process table failed sanity check.\n", getprogname());
+		fprintf(stderr, "is kernel out of sync?\n");
+		exit(1);
+	}
+
+	errno = ENOSYS;
+
+	return -1;
+}
+
 /* Unprivileged variant of getsysinfo. */
 PUBLIC ssize_t getsysinfo_up(who, what, size, where)
 endpoint_t who;			/* from whom to request info */