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(__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 }