fix errno for posix_openpt with no free ptys available

linux fails the open with ENOSPC, but POSIX mandates EAGAIN.

diff --git a/src/misc/pty.c b/src/misc/pty.c
index b9cb5ea..a057714 100644 (file)
--- 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)