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 "config-host.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 #endif
  51
  52 #ifdef __sun__
  53 /* Once Solaris has openpty(), this is going to be removed. */
  54 static int openpty(int *amaster, int *aslave, char *name,
  55                    struct termios *termp, struct winsize *winp)
  56 {
  57         const char *slave;
  58         int mfd = -1, sfd = -1;
  59
  60         *amaster = *aslave = -1;
  61
  62         mfd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
  63         if (mfd < 0)
  64                 goto err;
  65
  66         if (grantpt(mfd) == -1 || unlockpt(mfd) == -1)
  67                 goto err;
  68
  69         if ((slave = ptsname(mfd)) == NULL)
  70                 goto err;
  71
  72         if ((sfd = open(slave, O_RDONLY | O_NOCTTY)) == -1)
  73                 goto err;
  74
  75         if (ioctl(sfd, I_PUSH, "ptem") == -1 ||
  76             (termp != NULL && tcgetattr(sfd, termp) < 0))
  77                 goto err;
  78
  79         if (amaster)
  80                 *amaster = mfd;
  81         if (aslave)
  82                 *aslave = sfd;
  83         if (winp)
  84                 ioctl(sfd, TIOCSWINSZ, winp);
  85
  86         return 0;
  87
  88 err:
  89         if (sfd != -1)
  90                 close(sfd);
  91         close(mfd);
  92         return -1;
  93 }
  94
  95 static void cfmakeraw (struct termios *termios_p)
  96 {
  97         termios_p->c_iflag &=
  98                 ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
  99         termios_p->c_oflag &= ~OPOST;
 100         termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
 101         termios_p->c_cflag &= ~(CSIZE|PARENB);
 102         termios_p->c_cflag |= CS8;
 103
 104         termios_p->c_cc[VMIN] = 0;
 105         termios_p->c_cc[VTIME] = 0;
 106 }
 107 #endif
 108
 109 int qemu_openpty_raw(int *aslave, char *pty_name)
 110 {
 111     int amaster;
 112     struct termios tty;
 113 #if defined(__OpenBSD__) || defined(__DragonFly__)
 114     char pty_buf[PATH_MAX];
 115 #define q_ptsname(x) pty_buf
 116 #else
 117     char *pty_buf = NULL;
 118 #define q_ptsname(x) ptsname(x)
 119 #endif
 120
 121     if (openpty(&amaster, aslave, pty_buf, NULL, NULL) < 0) {
 122         return -1;
 123     }
 124
 125     /* Set raw attributes on the pty. */
 126     tcgetattr(*aslave, &tty);
 127     cfmakeraw(&tty);
 128     tcsetattr(*aslave, TCSAFLUSH, &tty);
 129
 130     if (pty_name) {
 131         strcpy(pty_name, q_ptsname(amaster));
 132     }
 133
 134     return amaster;
 135 }