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annotate lib/posix_openpt.c @ 16229:daac1ca4c436

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inttypes: Modernize. * lib/inttypes.in.h (strtoimax, strtoumax): Use the C++ safe idioms. * modules/inttypes-incomplete (Depends-on): Add snippet/c++defs. (Makefile.am): Update inttypes.h rule.
author Bruno Haible <bruno@clisp.org>
date Thu, 05 Jan 2012 18:42:08 +0100
parents 8250f2777afc
children 498a2211d839
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1 /* Open the master side of a pseudo-terminal.
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2 Copyright (C) 2010-2012 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include <stdlib.h>
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21
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22 #include <errno.h>
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23 #include <fcntl.h>
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24 #if defined __OpenBSD__
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25 # include <sys/ioctl.h>
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26 # include <sys/tty.h>
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27 #endif
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28
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29 /* posix_openpt() is already provided on
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30 glibc >= 2.2.1 (but is a stub on GNU/Hurd),
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31 MacOS X >= 10.4,
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32 FreeBSD >= 5.1 (lived in src/lib/libc/stdlib/grantpt.c before 8.0),
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33 NetBSD >= 3.0,
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34 AIX >= 5.2, HP-UX >= 11.31, Solaris >= 10, Cygwin >= 1.7.
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35 Thus, this replacement function is compiled on
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36 MacOS X 10.3, OpenBSD 4.9, Minix 3.1.8,
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37 AIX 5.1, HP-UX 11.23, IRIX 6.5, OSF/1 5.1, Solaris 9,
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38 Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS.
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39 Among these:
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40 - AIX has /dev/ptc.
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41 - HP-UX 10..11, IRIX 6.5, OSF/1 5.1, Solaris 2.6..9, Cygwin 1.5
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42 have /dev/ptmx.
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43 - HP-UX 10..11 also has /dev/ptym/clone, but this should not be needed.
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44 - OpenBSD 4.9 has /dev/ptm and the PTMGET ioctl.
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45 - Minix 3.1.8 have a list of pseudo-terminal devices in /dev.
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46 - On native Windows, there are no ttys at all. */
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47
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48 int
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49 posix_openpt (int flags)
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50 {
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51 int master;
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52
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53 #ifdef _AIX /* AIX */
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54
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55 master = open ("/dev/ptc", flags);
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56
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57 #elif (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ /* mingw */
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58
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59 /* Mingw lacks pseudo-terminals altogether. */
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60 master = -1;
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61 errno = ENOSYS;
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62
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63 #elif defined __OpenBSD__
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64
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65 /* On OpenBSD, master and slave of a pseudo-terminal are allocated together,
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66 by opening /dev/ptm and applying the PTMGET ioctl to it. */
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67 int fd;
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68 struct ptmget data;
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69
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70 fd = open (PATH_PTMDEV, O_RDWR);
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71 if (fd >= 0)
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72 {
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73 if (ioctl (fd, PTMGET, &data) >= 0)
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74 {
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75 master = data.cfd;
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76 close (data.sfd);
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77 close (fd);
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78 }
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79 else
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80 {
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81 int saved_errno = errno;
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82 close (fd);
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83 errno = saved_errno;
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84 master = -1;
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85 }
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86 }
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87 else
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88 master = -1;
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89
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90 #else /* MacOS X, Minix, HP-UX, IRIX, OSF/1, Solaris 9, Cygwin 1.5 */
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91
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92 /* Most systems that lack posix_openpt() have /dev/ptmx. */
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93 master = open ("/dev/ptmx", flags);
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94
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95 /* If all this does not work, we could try to open, one by one:
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96 - On MacOS X: /dev/pty[p-w][0-9a-f]
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97 - On *BSD: /dev/pty[p-sP-S][0-9a-v]
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98 - On Minix: /dev/pty[p-q][0-9a-f]
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99 - On AIX: /dev/ptyp[0-9a-f]
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100 - On HP-UX: /dev/pty[p-r][0-9a-f]
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101 - On OSF/1: /dev/pty[p-q][0-9a-f]
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102 - On Solaris: /dev/pty[p-r][0-9a-f]
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103 */
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104
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105 #endif
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106
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107 return master;
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108 }