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(__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. */
  56static 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
  90err:
  91        if (sfd != -1)
  92                close(sfd);
  93        close(mfd);
  94        return -1;
  95}
  96
  97static 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
 111int 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