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e8210ece | 1 | /* Copyright (C) 1998, 1999, 2004 Free Software Foundation, Inc. |
6591c335 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
6591c335 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6591c335 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
6591c335 | 19 | |
00bc5db0 | 20 | #include <errno.h> |
6591c335 | 21 | #include <fcntl.h> |
00bc5db0 | 22 | #include <limits.h> |
6591c335 UD |
23 | #include <pty.h> |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <termios.h> | |
27 | #include <unistd.h> | |
28 | #include <sys/types.h> | |
29 | ||
6591c335 | 30 | |
00bc5db0 UD |
31 | /* Return the result of ptsname_r in the buffer pointed to by PTS, |
32 | which should be of length BUF_LEN. If it is too long to fit in | |
33 | this buffer, a sufficiently long buffer is allocated using malloc, | |
34 | and returned in PTS. 0 is returned upon success, -1 otherwise. */ | |
35 | static int | |
36 | pts_name (int fd, char **pts, size_t buf_len) | |
37 | { | |
38 | int rv; | |
39 | char *buf = *pts; | |
40 | ||
41 | for (;;) | |
42 | { | |
43 | char *new_buf; | |
44 | ||
45 | if (buf_len) | |
46 | { | |
47 | rv = ptsname_r (fd, buf, buf_len); | |
48 | ||
49 | if (rv != 0 || memchr (buf, '\0', buf_len)) | |
50 | /* We either got an error, or we succeeded and the | |
51 | returned name fit in the buffer. */ | |
52 | break; | |
53 | ||
54 | /* Try again with a longer buffer. */ | |
55 | buf_len += buf_len; /* Double it */ | |
56 | } | |
57 | else | |
58 | /* No initial buffer; start out by mallocing one. */ | |
59 | buf_len = 128; /* First time guess. */ | |
60 | ||
61 | if (buf != *pts) | |
62 | /* We've already malloced another buffer at least once. */ | |
63 | new_buf = realloc (buf, buf_len); | |
64 | else | |
65 | new_buf = malloc (buf_len); | |
66 | if (! new_buf) | |
67 | { | |
68 | rv = -1; | |
69 | __set_errno (ENOMEM); | |
70 | break; | |
71 | } | |
72 | buf = new_buf; | |
73 | } | |
74 | ||
75 | if (rv == 0) | |
76 | *pts = buf; /* Return buffer to the user. */ | |
77 | else if (buf != *pts) | |
78 | free (buf); /* Free what we malloced when returning an error. */ | |
79 | ||
80 | return rv; | |
81 | } | |
82 | ||
83 | /* Create pseudo tty master slave pair and set terminal attributes | |
84 | according to TERMP and WINP. Return handles for both ends in | |
85 | AMASTER and ASLAVE, and return the name of the slave end in NAME. */ | |
6591c335 | 86 | int |
00bc5db0 UD |
87 | openpty (int *amaster, int *aslave, char *name, struct termios *termp, |
88 | struct winsize *winp) | |
6591c335 | 89 | { |
00bc5db0 UD |
90 | #ifdef PATH_MAX |
91 | char _buf[PATH_MAX]; | |
92 | #else | |
93 | char _buf[512]; | |
94 | #endif | |
95 | char *buf = _buf; | |
96 | int master, slave; | |
6591c335 | 97 | |
00bc5db0 UD |
98 | master = getpt (); |
99 | if (master == -1) | |
6591c335 UD |
100 | return -1; |
101 | ||
00bc5db0 UD |
102 | if (grantpt (master)) |
103 | goto fail; | |
104 | ||
105 | if (unlockpt (master)) | |
106 | goto fail; | |
6591c335 | 107 | |
00bc5db0 UD |
108 | if (pts_name (master, &buf, sizeof (_buf))) |
109 | goto fail; | |
6591c335 | 110 | |
6d8ec2b1 | 111 | slave = open (buf, O_RDWR | O_NOCTTY); |
00bc5db0 UD |
112 | if (slave == -1) |
113 | { | |
114 | if (buf != _buf) | |
115 | free (buf); | |
6591c335 | 116 | |
00bc5db0 UD |
117 | goto fail; |
118 | } | |
6591c335 UD |
119 | |
120 | /* XXX Should we ignore errors here? */ | |
00bc5db0 UD |
121 | if(termp) |
122 | tcsetattr (slave, TCSAFLUSH, termp); | |
123 | if (winp) | |
124 | ioctl (slave, TIOCSWINSZ, winp); | |
125 | ||
126 | *amaster = master; | |
127 | *aslave = slave; | |
128 | if (name != NULL) | |
129 | strcpy (name, buf); | |
6591c335 | 130 | |
00bc5db0 UD |
131 | if (buf != _buf) |
132 | free (buf); | |
133 | return 0; | |
6d8ec2b1 | 134 | |
00bc5db0 UD |
135 | fail: |
136 | close (master); | |
6591c335 UD |
137 | return -1; |
138 | } | |
e8210ece | 139 | libutil_hidden_def (openpty) |