diff --git a/bin/ps/keyword.c b/bin/ps/keyword.c
--- a/bin/ps/keyword.c
+++ b/bin/ps/keyword.c
@@ -44,7 +44,6 @@
 #include <sys/sysctl.h>
 #include <sys/user.h>
 
-#include <err.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -258,7 +257,8 @@
 	}
 	xo_emit("\n");
 	xo_close_list("key");
-	xo_finish();
+	if (xo_finish() < 0)
+		xo_err(EXIT_FAILURE, "stdout");
 }
 
 void
@@ -299,7 +299,7 @@
 				continue;
 		}
 		if ((vent = malloc(sizeof(struct varent))) == NULL)
-			errx(1, "malloc failed");
+			xo_errx(1, "malloc failed");
 		vent->header = v->header;
 		if (hp) {
 			hp = strdup(hp);
@@ -308,15 +308,15 @@
 		}
 		vent->var = malloc(sizeof(*vent->var));
 		if (vent->var == NULL)
-			errx(1, "malloc failed");
+			xo_errx(1, "malloc failed");
 		memcpy(vent->var, v, sizeof(*vent->var));
 		STAILQ_INSERT_TAIL(&varlist, vent, next_ve);
 	}
 	free(tempstr1);
 	if (STAILQ_EMPTY(&varlist)) {
-		warnx("no valid keywords; valid keywords:");
+		xo_warnx("no valid keywords; valid keywords:");
 		showkey();
-		exit(1);
+		exit(EXIT_FAILURE);
 	}
 }
 
@@ -353,7 +353,7 @@
 			rflen = strlen(v->alias) + strlen(hp) + 2;
 			realfmt = malloc(rflen);
 			if (realfmt == NULL)
-				errx(1, "malloc failed");
+				xo_errx(1, "malloc failed");
 			snprintf(realfmt, rflen, "%s=%s", v->alias, hp);
 			parsefmt(realfmt, user);
 			free(realfmt);
@@ -361,7 +361,7 @@
 		return ((VAR *)NULL);
 	}
 	if (!v) {
-		warnx("%s: keyword not found", p);
+		xo_warnx("%s: keyword not found", p);
 		eval = 1;
 	}
 	if (header)
diff --git a/bin/ps/print.c b/bin/ps/print.c
--- a/bin/ps/print.c
+++ b/bin/ps/print.c
@@ -49,7 +49,6 @@
 #include <sys/sysctl.h>
 #include <sys/vmmeter.h>
 
-#include <err.h>
 #include <grp.h>
 #include <jail.h>
 #include <langinfo.h>
diff --git a/bin/ps/ps.c b/bin/ps/ps.c
--- a/bin/ps/ps.c
+++ b/bin/ps/ps.c
@@ -61,7 +61,6 @@
 #include <sys/mount.h>
 
 #include <ctype.h>
-#include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <grp.h>
@@ -243,7 +242,7 @@
 
 	argc = xo_parse_args(argc, argv);
 	if (argc < 0)
-		exit(1);
+		exit(EXIT_FAILURE);
 
 	while ((ch = getopt(argc, argv, PS_ARGS)) != -1)
 		switch (ch) {
@@ -314,7 +313,7 @@
 			break;
 		case 'L':
 			showkey();
-			exit(0);
+			exit(EXIT_SUCCESS);
 		case 'l':
 			parsefmt(lfmt, 0);
 			_fmt = 1;
@@ -460,7 +459,7 @@
 		usage();
 	}
 	if (optfatal)
-		exit(1);		/* Error messages already printed. */
+		exit(EXIT_FAILURE);		/* Error messages already printed. */
 	if (xkeep < 0)			/* Neither -X nor -x was specified. */
 		xkeep = xkeep_implied;
 
@@ -635,8 +634,9 @@
 
 	if (nkept == 0) {
 		printheader();
-		xo_finish();
-		exit(1);
+		if (xo_finish() < 0)
+			xo_err(EXIT_FAILURE, "stdout");
+		exit(EXIT_FAILURE);
 	}
 
 	/*
@@ -720,7 +720,8 @@
 	}
 	xo_close_list("process");
 	xo_close_container("process-information");
-	xo_finish();
+	if (xo_finish() < 0)
+		xo_err(EXIT_FAILURE, "stdout");
 
 	free_list(&gidlist);
 	free_list(&jidlist);
@@ -790,14 +791,14 @@
 	int tempid;
 
 	if (*elem == '\0') {
-		warnx("Invalid (zero-length) jail id");
+		xo_warnx("Invalid (zero-length) jail id");
 		optfatal = 1;
 		return (0);		/* Do not add this value. */
 	}
 
 	tempid = jail_getid(elem);
 	if (tempid < 0) {
-		warnx("Invalid %s: %s", inf->lname, elem);
+		xo_warnx("Invalid %s: %s", inf->lname, elem);
 		optfatal = 1;
 		return (0);
 	}
@@ -1463,5 +1464,5 @@
 	    "          [-G gid[,gid...]] [-J jid[,jid...]] [-M core] [-N system]",
 	    "          [-p pid[,pid...]] [-t tty[,tty...]] [-U user[,user...]]",
 	    "       ps [--libxo] -L");
-	exit(1);
+	exit(EXIT_FAILURE);
 }