1 /*
2 * qemu-openpty.c
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2010 Red Hat, Inc.
6 *
7 * Wrapper function qemu_openpty() implementation.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 * THE SOFTWARE.
26 */
27
28 /*
29 * This is not part of oslib-posix.c because this function
30 * uses openpty() which often in -lutil, and if we add this
31 * dependency to oslib-posix.o, every app will have to be
32 * linked with -lutil.
33 */
34
35 #include "qemu/osdep.h"
36 #include "qemu-common.h"
37
38 #if defined HAVE_PTY_H
39 # include <pty.h>
40 #elif defined CONFIG_BSD
41 # include <termios.h>
42 # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
43 # include <libutil.h>
44 # else
45 # include <util.h>
46 # endif
47 #elif defined CONFIG_SOLARIS
48 # include <termios.h>
49 # include <stropts.h>
50 #else
51 # include <termios.h>
52 #endif
53
54 #ifdef __sun__
55
56 #if !defined(HAVE_OPENPTY)
57 /* Once illumos has openpty(), this is going to be removed. */
openpty(int * amaster,int * aslave,char * name,struct termios * termp,struct winsize * winp)58 static int openpty(int *amaster, int *aslave, char *name,
59 struct termios *termp, struct winsize *winp)
60 {
61 const char *slave;
62 int mfd = -1, sfd = -1;
63
64 *amaster = *aslave = -1;
65
66 mfd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
67 if (mfd < 0)
68 goto err;
69
70 if (grantpt(mfd) == -1 || unlockpt(mfd) == -1)
71 goto err;
72
73 if ((slave = ptsname(mfd)) == NULL)
74 goto err;
75
76 if ((sfd = open(slave, O_RDONLY | O_NOCTTY)) == -1)
77 goto err;
78
79 if (ioctl(sfd, I_PUSH, "ptem") == -1 ||
80 (termp != NULL && tcgetattr(sfd, termp) < 0))
81 goto err;
82
83 if (amaster)
84 *amaster = mfd;
85 if (aslave)
86 *aslave = sfd;
87 if (winp)
88 ioctl(sfd, TIOCSWINSZ, winp);
89
90 return 0;
91
92 err:
93 if (sfd != -1)
94 close(sfd);
95 close(mfd);
96 return -1;
97 }
98 #endif
99
cfmakeraw(struct termios * termios_p)100 static void cfmakeraw (struct termios *termios_p)
101 {
102 termios_p->c_iflag &=
103 ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
104 termios_p->c_oflag &= ~OPOST;
105 termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
106 termios_p->c_cflag &= ~(CSIZE|PARENB);
107 termios_p->c_cflag |= CS8;
108
109 termios_p->c_cc[VMIN] = 0;
110 termios_p->c_cc[VTIME] = 0;
111 }
112 #endif
113
qemu_openpty_raw(int * aslave,char * pty_name)114 int qemu_openpty_raw(int *aslave, char *pty_name)
115 {
116 int amaster;
117 struct termios tty;
118 #if defined(__OpenBSD__) || defined(__DragonFly__)
119 char pty_buf[PATH_MAX];
120 #define q_ptsname(x) pty_buf
121 #else
122 char *pty_buf = NULL;
123 #define q_ptsname(x) ptsname(x)
124 #endif
125
126 if (openpty(&amaster, aslave, pty_buf, NULL, NULL) < 0) {
127 return -1;
128 }
129
130 /* Set raw attributes on the pty. */
131 tcgetattr(*aslave, &tty);
132 cfmakeraw(&tty);
133 tcsetattr(*aslave, TCSAFLUSH, &tty);
134
135 if (pty_name) {
136 strcpy(pty_name, q_ptsname(amaster));
137 }
138
139 return amaster;
140 }
141