LXR qemu/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. */
  58static 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
  92err:
  93        if (sfd != -1)
  94                close(sfd);
  95        close(mfd);
  96        return -1;
  97}
  98#endif
  99
 100static 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
 114int 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