From 4fd0f2056082441a4503f6bfcb787a7c15754518 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Tue, 22 Oct 2019 10:22:22 -0400
Subject: fix errno for posix_openpt with no free ptys available

linux fails the open with ENOSPC, but POSIX mandates EAGAIN.
---
 src/misc/pty.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/misc/pty.c b/src/misc/pty.c
index b9cb5eaa..a0577147 100644
--- a/src/misc/pty.c
+++ b/src/misc/pty.c
@@ -7,7 +7,9 @@
 
 int posix_openpt(int flags)
 {
-	return open("/dev/ptmx", flags);
+	int r = open("/dev/ptmx", flags);
+	if (r < 0 && errno == ENOSPC) errno = EAGAIN;
+	return r;
 }
 
 int grantpt(int fd)
-- 
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