/* Open the master side of a pseudo-terminal.
- Copyright (C) 2010-2011 Free Software Foundation, Inc.
+ Copyright (C) 2010-2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
/* Specification. */
#include <stdlib.h>
-#include <fcntl.h>
#include <errno.h>
+#include <fcntl.h>
+#if defined __OpenBSD__
+# include <sys/ioctl.h>
+# include <sys/tty.h>
+#endif
+
+/* posix_openpt() is already provided on
+ glibc >= 2.2.1 (but is a stub on GNU/Hurd),
+ Mac OS X >= 10.4,
+ FreeBSD >= 5.1 (lived in src/lib/libc/stdlib/grantpt.c before 8.0),
+ NetBSD >= 3.0,
+ AIX >= 5.2, HP-UX >= 11.31, Solaris >= 10, Cygwin >= 1.7.
+ Thus, this replacement function is compiled on
+ Mac OS X 10.3, OpenBSD 4.9, Minix 3.1.8,
+ AIX 5.1, HP-UX 11.23, IRIX 6.5, OSF/1 5.1, Solaris 9,
+ Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS.
+ Among these:
+ - AIX has /dev/ptc.
+ - HP-UX 10..11, IRIX 6.5, OSF/1 5.1, Solaris 2.6..9, Cygwin 1.5
+ have /dev/ptmx.
+ - HP-UX 10..11 also has /dev/ptym/clone, but this should not be needed.
+ - OpenBSD 4.9 has /dev/ptm and the PTMGET ioctl.
+ - Minix 3.1.8 have a list of pseudo-terminal devices in /dev.
+ - On native Windows, there are no ttys at all. */
int
posix_openpt (int flags)
master = -1;
errno = ENOSYS;
-#else /* MacOS, OpenBSD, HP-UX, IRIX, Solaris 9, Cygwin 1.5 */
+#elif defined __OpenBSD__
+
+ /* On OpenBSD, master and slave of a pseudo-terminal are allocated together,
+ by opening /dev/ptm and applying the PTMGET ioctl to it. */
+ int fd;
+ struct ptmget data;
+
+ fd = open (PATH_PTMDEV, O_RDWR);
+ if (fd >= 0)
+ {
+ if (ioctl (fd, PTMGET, &data) >= 0)
+ {
+ master = data.cfd;
+ close (data.sfd);
+ close (fd);
+ }
+ else
+ {
+ int saved_errno = errno;
+ close (fd);
+ errno = saved_errno;
+ master = -1;
+ }
+ }
+ else
+ master = -1;
+
+#else /* Mac OS X, Minix, HP-UX, IRIX, OSF/1, Solaris 9, Cygwin 1.5 */
/* Most systems that lack posix_openpt() have /dev/ptmx. */
master = open ("/dev/ptmx", flags);
+ /* If all this does not work, we could try to open, one by one:
+ - On Mac OS X: /dev/pty[p-w][0-9a-f]
+ - On *BSD: /dev/pty[p-sP-S][0-9a-v]
+ - On Minix: /dev/pty[p-q][0-9a-f]
+ - On AIX: /dev/ptyp[0-9a-f]
+ - On HP-UX: /dev/pty[p-r][0-9a-f]
+ - On OSF/1: /dev/pty[p-q][0-9a-f]
+ - On Solaris: /dev/pty[p-r][0-9a-f]
+ */
+
#endif
return master;