1 files changed, 6 insertions, 3 deletions
diff --git a/src/misc/pty.c b/src/misc/pty.c
index 6ca33e31..9e201ef3 100644
--- a/src/misc/pty.c
+++ b/src/misc/pty.c
@@ -2,7 +2,9 @@
 #include <sys/ioctl.h>
 #include <stdio.h>
 #include <fcntl.h>
+#include <errno.h>
 #include "libc.h"
+#include "syscall.h"
 
 int posix_openpt(int flags)
 {
@@ -22,10 +24,11 @@ int unlockpt(int fd)
 
 int __ptsname_r(int fd, char *buf, size_t len)
 {
-	int pty;
+	int pty, err;
 	if (!buf) len = 0;
-	return -( ioctl (fd, TIOCGPTN, &pty) < 0
-		|| snprintf(buf, len, "/dev/pts/%d", pty) >= len );
+	if ((err = __syscall(SYS_ioctl, fd, TIOCGPTN, &pty))) return err;
+	if (snprintf(buf, len, "/dev/pts/%d", pty) >= len) return ERANGE;
+	return 0;
 }
 
 weak_alias(__ptsname_r, ptsname_r);