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authorThomas White <taw@physics.org>2014-08-19 14:22:22 +0200
committerThomas White <taw@physics.org>2014-08-19 14:47:44 +0200
commit7ae6605846ecc70c937fca31b2133082aae055df (patch)
tree00bcacb21248f86caf91a02c55bc5178a52cd27f /lib/posix_openpt.c
parent1a532028cb2f2df6f12e518bdf6d3425bbb28b08 (diff)
Use Gnulib forkpty()
Diffstat (limited to 'lib/posix_openpt.c')
-rw-r--r--lib/posix_openpt.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/posix_openpt.c b/lib/posix_openpt.c
new file mode 100644
index 00000000..92eec2e9
--- /dev/null
+++ b/lib/posix_openpt.c
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+/* Open the master side of a pseudo-terminal.
+ Copyright (C) 2010-2014 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
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <stdlib.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)
+{
+ int master;
+
+#ifdef _AIX /* AIX */
+
+ master = open ("/dev/ptc", flags);
+
+#elif (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ /* mingw */
+
+ /* Mingw lacks pseudo-terminals altogether. */
+ master = -1;
+ errno = ENOSYS;
+
+#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;
+}