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Index: lib/libkvm/kvm.c
===================================================================
--- lib/libkvm/kvm.c
+++ lib/libkvm/kvm.c
@@ -69,6 +69,9 @@
char *
kvm_geterr(kvm_t *kd)
{
+
+ if (kd == NULL)
+ return ("");
return (kd->errbuf);
}
@@ -272,6 +275,10 @@
{
int error = 0;
+ if (kd == NULL) {
+ errno = EINVAL;
+ return (-1);
+ }
if (kd->vmst != NULL)
kd->arch->ka_freevtop(kd);
if (kd->pmfd >= 0)
Index: lib/libkvm/kvm_geterr.3
===================================================================
--- lib/libkvm/kvm_geterr.3
+++ lib/libkvm/kvm_geterr.3
@@ -32,7 +32,7 @@
.\" @(#)kvm_geterr.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
-.Dd June 4, 1993
+.Dd March 15, 2017
.Dt KVM_GETERR 3
.Os
.Sh NAME
@@ -54,6 +54,15 @@
The string returned is stored in memory owned by
.Xr kvm 3
so the message should be copied out and saved elsewhere if necessary.
+.Sh RETURN VALUES
+The function
+.Fn kvm_geterr
+will return "" if
+.Fa kd
+is
+.Dv NULL
+or an error has not been captured for
+.Fa kd .
.Sh SEE ALSO
.Xr kvm 3 ,
.Xr kvm_close 3 ,
Index: lib/libkvm/kvm_open.3
===================================================================
--- lib/libkvm/kvm_open.3
+++ lib/libkvm/kvm_open.3
@@ -227,10 +227,29 @@
write the error message into
.Fa errbuf .
.Pp
+.Rv -std kvm_close
+.Sh ERRORS
The
.Fn kvm_close
-function returns 0 on success and -1 on failure.
+function may fail and set the global variable
+.Va errno
+for any of the errors specified for
+.Xr close 2 .
+.Pp
+The
+.Fn kvm_close
+function may also fail and set
+.Va errno
+if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value passed via
+.Fa *kd
+was
+.Dv NULL .
+.El
.Sh SEE ALSO
+.Xr close 2 ,
.Xr open 2 ,
.Xr kvm 3 ,
.Xr kvm_getargv 3 ,

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