util/qemu-openpty.c

   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. */
  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
 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
 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 }