Merge pull request #435 from mmcco/freebsd

Improve error reporting on FreeBSD libkvm call

freebsd/FreeBSDProcessList.c

@@ -14,7 +14,9 @@ in the source distribution for its full text.
 #include <sys/types.h>
 #include <sys/sysctl.h>
 #include <sys/user.h>
+#include <err.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <string.h>
 
 /*{
@@ -86,12 +88,12 @@ static int kernelFScale;
 
 
 ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidWhiteList, uid_t userId) {
+ size_t len;
+ char errbuf[_POSIX2_LINE_MAX];
  FreeBSDProcessList* fpl = xCalloc(1, sizeof(FreeBSDProcessList));
  ProcessList* pl = (ProcessList*) fpl;
  ProcessList_init(pl, Class(FreeBSDProcess), usersTable, pidWhiteList, userId);
 
- size_t len;
-
  // physical memory in system: hw.physmem
  // physical page size: hw.pagesize
  // usable pagesize : vm.stats.vm.v_page_size
@@ -178,8 +180,10 @@ ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidWhiteList, ui
  kernelFScale = 2048;
  }
 
- fpl->kd = kvm_open(NULL, "/dev/null", NULL, 0, NULL);
- assert(fpl->kd);
+ fpl->kd = kvm_openfiles(NULL, "/dev/null", NULL, 0, errbuf);
+ if (fpl->kd == NULL) {
+ errx(1, "kvm_open: %s", errbuf);
+ }
 
  return pl;
 }