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annotate lib/openpty.c @ 15972:167933697036

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openpty: Update comments. * lib/openpty.c: Add comments about Minix.
author Bruno Haible <bruno@clisp.org>
date Thu, 20 Oct 2011 11:44:11 +0200
parents 97fc9a21a8fb
children ca99be30d00b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Open a pseudo-terminal.
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97fc9a21a8fb maint: update almost all copyright ranges to include 2011
Jim Meyering <meyering@redhat.com>
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2 Copyright (C) 2010-2011 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 <pty.h>
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21
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22 #if HAVE_OPENPTY
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23
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80d3dab738c0 Fix comments.
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24 /* Provide a wrapper with the prototype of glibc-2.8 and newer. */
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25 # undef openpty
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26 int
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27 rpl_openpty (int *amaster, int *aslave, char *name,
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28 struct termios const *termp, struct winsize const *winp)
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29 {
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30 /* Cast away const, for implementations with weaker prototypes. */
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31 return openpty (amaster, aslave, name, (struct termios *) termp,
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32 (struct winsize *) winp);
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33 }
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34
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35 #else /* AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, mingw */
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36
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37 # include <fcntl.h>
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38 # include <string.h>
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39 # include <sys/ioctl.h>
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40 # include <termios.h>
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41 # include <unistd.h>
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42 # if defined __sun || defined __hpux /* Solaris, HP-UX */
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43 # include <stropts.h>
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44 # endif
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45
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46 int
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47 openpty (int *amaster, int *aslave, char *name,
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48 struct termios const *termp, struct winsize const *winp)
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49 {
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50 int master;
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51 char *slave_name;
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52 int slave;
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53
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54 # if HAVE__GETPTY /* IRIX */
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55
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56 slave_name = _getpty (&master, O_RDWR, 0622, 0);
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57 if (slave_name == NULL)
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58 return -1;
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59
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60 # else /* AIX 5.1, HP-UX 11, Solaris 10, mingw */
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61
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62 # if HAVE_POSIX_OPENPT /* Solaris 10 */
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63
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64 master = posix_openpt (O_RDWR | O_NOCTTY);
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65 if (master < 0)
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66 return -1;
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67
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68 # else /* AIX 5.1, HP-UX 11, Solaris 9, mingw */
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69
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70 # ifdef _AIX /* AIX */
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71
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72 master = open ("/dev/ptc", O_RDWR | O_NOCTTY);
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73 if (master < 0)
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74 return -1;
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75
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76 # else /* HP-UX 11, Solaris 9, mingw */
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77
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78 /* HP-UX, Solaris have /dev/ptmx.
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79 HP-UX also has /dev/ptym/clone, but this should not be needed.
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80 Linux also has /dev/ptmx, but Linux already has openpty().
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81 MacOS X also has /dev/ptmx, but MacOS X already has openpty().
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82 OSF/1 also has /dev/ptmx and /dev/ptmx_bsd, but OSF/1 already has
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83 openpty(). */
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84 master = open ("/dev/ptmx", O_RDWR | O_NOCTTY);
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85 if (master < 0)
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86 return -1;
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87
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88 # endif
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89
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90 # endif
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91
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92 /* If all this does not work, we could try to open, one by one:
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93 - On MacOS X: /dev/pty[p-w][0-9a-f]
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94 - On *BSD: /dev/pty[p-sP-S][0-9a-v]
15972
167933697036 openpty: Update comments.
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95 - On Minix: /dev/pty[p-q][0-9a-f]
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96 - On AIX: /dev/ptyp[0-9a-f]
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97 - On HP-UX: /dev/pty[p-r][0-9a-f]
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98 - On OSF/1: /dev/pty[p-q][0-9a-f]
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99 - On Solaris: /dev/pty[p-r][0-9a-f]
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100 */
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101 # endif
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102
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103 /* This call does not require a dependency to the 'grantpt' module,
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104 because AIX, HP-UX, IRIX, Solaris all have the grantpt() function. */
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105 if (grantpt (master))
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106 goto fail;
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107
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108 /* This call does not require a dependency to the 'unlockpt' module,
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109 because AIX, HP-UX, IRIX, Solaris all have the unlockpt() function. */
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110 if (unlockpt (master))
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111 goto fail;
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112
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113 # if !HAVE__GETPTY /* !IRIX */
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114 slave_name = ptsname (master);
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115 if (slave_name == NULL)
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116 goto fail;
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117 # endif
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118
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119 slave = open (slave_name, O_RDWR | O_NOCTTY);
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diff changeset
120 if (slave == -1)
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
121 goto fail;
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
122
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
123 # if defined __sun || defined __hpux /* Solaris, HP-UX */
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
124 if (ioctl (slave, I_PUSH, "ptem") < 0
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
125 || ioctl (slave, I_PUSH, "ldterm") < 0
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
126 # if defined __sun
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
127 || ioctl (slave, I_PUSH, "ttcompat") < 0
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
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128 # endif
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
129 )
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
130 {
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
131 close (slave);
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
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132 goto fail;
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
133 }
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
134 # endif
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
135
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
136 /* XXX Should we ignore errors here? */
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
137 if (termp)
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
138 tcsetattr (slave, TCSAFLUSH, termp);
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
139 if (winp)
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
140 ioctl (slave, TIOCSWINSZ, winp);
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
141
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
142 *amaster = master;
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
143 *aslave = slave;
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
144 if (name != NULL)
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
145 strcpy (name, slave_name);
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
146
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
147 return 0;
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
148
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
149 fail:
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
150 close (master);
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
151 return -1;
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
152 }
64faceabf217 openpty: Provide replacement on AIX, HP-UX, IRIX, Solaris.
Bruno Haible <bruno@clisp.org>
parents: 13006
diff changeset
153
13006
b89998923de3 forkpty, openpty: prefer glibc's const-safe prototype
Eric Blake <eblake@redhat.com>
parents:
diff changeset
154 #endif