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(__GLIBC__) |
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 | /* Once Solaris has openpty(), this is going to be removed. */ |
56 | static int openpty(int *amaster, int *aslave, char *name, |
57 | struct termios *termp, struct winsize *winp) |
58 | { |
59 | const char *slave; |
60 | int mfd = -1, sfd = -1; |
61 | |
62 | *amaster = *aslave = -1; |
63 | |
64 | mfd = open("/dev/ptmx" , O_RDWR | O_NOCTTY); |
65 | if (mfd < 0) |
66 | goto err; |
67 | |
68 | if (grantpt(mfd) == -1 || unlockpt(mfd) == -1) |
69 | goto err; |
70 | |
71 | if ((slave = ptsname(mfd)) == NULL) |
72 | goto err; |
73 | |
74 | if ((sfd = open(slave, O_RDONLY | O_NOCTTY)) == -1) |
75 | goto err; |
76 | |
77 | if (ioctl(sfd, I_PUSH, "ptem" ) == -1 || |
78 | (termp != NULL && tcgetattr(sfd, termp) < 0)) |
79 | goto err; |
80 | |
81 | if (amaster) |
82 | *amaster = mfd; |
83 | if (aslave) |
84 | *aslave = sfd; |
85 | if (winp) |
86 | ioctl(sfd, TIOCSWINSZ, winp); |
87 | |
88 | return 0; |
89 | |
90 | err: |
91 | if (sfd != -1) |
92 | close(sfd); |
93 | close(mfd); |
94 | return -1; |
95 | } |
96 | |
97 | static void cfmakeraw (struct termios *termios_p) |
98 | { |
99 | termios_p->c_iflag &= |
100 | ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON); |
101 | termios_p->c_oflag &= ~OPOST; |
102 | termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); |
103 | termios_p->c_cflag &= ~(CSIZE|PARENB); |
104 | termios_p->c_cflag |= CS8; |
105 | |
106 | termios_p->c_cc[VMIN] = 0; |
107 | termios_p->c_cc[VTIME] = 0; |
108 | } |
109 | #endif |
110 | |
111 | int qemu_openpty_raw(int *aslave, char *pty_name) |
112 | { |
113 | int amaster; |
114 | struct termios tty; |
115 | #if defined(__OpenBSD__) || defined(__DragonFly__) |
116 | char pty_buf[PATH_MAX]; |
117 | #define q_ptsname(x) pty_buf |
118 | #else |
119 | char *pty_buf = NULL; |
120 | #define q_ptsname(x) ptsname(x) |
121 | #endif |
122 | |
123 | if (openpty(&amaster, aslave, pty_buf, NULL, NULL) < 0) { |
124 | return -1; |
125 | } |
126 | |
127 | /* Set raw attributes on the pty. */ |
128 | tcgetattr(*aslave, &tty); |
129 | cfmakeraw(&tty); |
130 | tcsetattr(*aslave, TCSAFLUSH, &tty); |
131 | |
132 | if (pty_name) { |
133 | strcpy(pty_name, q_ptsname(amaster)); |
134 | } |
135 | |
136 | return amaster; |
137 | } |
138 | |