C++ posix_openpt函数代码示例

int create_pts(void)
{
	int pts = posix_openpt(O_RDWR | O_NONBLOCK);
	struct termios termios;

	if (pts < 0)
		err(1, "failed to create pseudo terminal");

	if (grantpt(pts))
		err(1, "failed to grant psuedo terminal access");

	if (unlockpt(pts))
		err(1, "failed to unlock pseudo terminal");

	if (tcgetattr(pts, &termios))
		err(1, "failed to get termios");
	cfmakeraw(&termios);
	if (tcsetattr(pts, TCSANOW, &termios))
		err(1, "failed to set termios");

	if (sim_is_interactive())
		printf("pts: %s\n", ptsname(pts));

	return pts;
}

int
GUCEF_pty_open( int* fdm, int* fds )
{
    int masterfd, slavefd;
    char *slavedevice;

    /*
     *  O_RDWR = Open the device for both reading and writing. It is usual to specify this flag.
     *  O_NOCTTY = Do not make this device the controlling terminal for the process.
     */
    masterfd = posix_openpt( O_RDWR | O_NOCTTY );

    if ( masterfd == -1 ||
         grantpt (masterfd) == -1 ||
         unlockpt (masterfd) == -1 ||
         (slavedevice = ptsname (masterfd)) == NULL)
        return 1;

    slavefd = open(slavedevice, O_RDWR|O_NOCTTY);
    if (slavefd < 0)
        return 1;

    /* success */
    *fdm = masterfd;
    *fds = slavefd;
    return 0;
}

/* To open and start new
 * python shell process
 */
gboolean
ptyFork (ChildProcessData *python_shell_data, GError **error)
{
    int mfd, slaveFd, savedErrno;

    mfd = posix_openpt (O_RDWR | O_NOCTTY | O_NONBLOCK);     
    grantpt (mfd);
    unlockpt (mfd);

    python_shell_data->master_fd = mfd;
    python_shell_data->slave_name = g_strdup (ptsname (mfd));
    python_shell_data->sh_argv = g_malloc0 (sizeof (gchar *));
    python_shell_data->sh_argv[0] = g_strdup ("/bin/sh");

    /*if (!g_spawn_async (python_shell_data->current_dir, python_shell_data->argv, NULL, 0, 
                       child_func, (gpointer)python_shell_data, 
                       &(python_shell_data->pid), error))

        return FALSE;*/

    pid_t childPid = fork ();
    if (childPid == 0)
    {
        child_func ((gpointer)python_shell_data);
        execv (python_shell_data->sh_argv [0], python_shell_data->sh_argv);
    }
    python_shell_data->pid = childPid;
    return TRUE;
}

int ptym_open(char *pts_name, int pts_namesz)
{
    char *ptr;
    int fdm;

    /*
     * Return the name of the master device so that on failure
     * the caller can print an error message. Null terminate
     * to handle case where string length > pts_namesz.
     */
    strncpy(pts_name, "/dev/ptyXY", pts_namesz);
    pts_name[pts_namesz - 1] = '\0';
    if ((fdm = posix_openpt(O_RDWR)) < 0)
        return(-1);
    if (grantpt(fdm) < 0) {     /* grant access to slave */
        close(fdm);
        return(-2);
    }
    if (unlockpt(fdm) < 0) {    /* clear slave's lock flag */
        close(fdm);
        return(-3);
    }
    if ((ptr = ptsname(fdm)) == NULL) {     /* get slave's name */
        close(fdm);
        return(-4);
    }

    /*
     * Return name of slave. Null terminate to handle
     * case where strlen(ptr) > pts_namesz.
     */
    strncpy(pts_name, ptr, pts_namesz);
    pts_name[pts_namesz - 1] = '\0';
    return(fdm);    /* return fd of master */
}

bool
get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
{
    char *line;
    bool rval = false;
    debug_decl(get_pty, SUDO_DEBUG_PTY)

    *master = posix_openpt(O_RDWR|O_NOCTTY);
    if (*master != -1) {
	(void) grantpt(*master); /* may fork */
	if (unlockpt(*master) != 0) {
	    close(*master);
	    goto done;
	}
	line = ptsname(*master);
	if (line == NULL) {
	    close(*master);
	    goto done;
	}
	*slave = open(line, O_RDWR|O_NOCTTY, 0);
	if (*slave == -1) {
	    close(*master);
	    goto done;
	}
# if defined(I_PUSH) && !defined(_AIX)
	ioctl(*slave, I_PUSH, "ptem");	/* pseudo tty emulation module */
	ioctl(*slave, I_PUSH, "ldterm");	/* line discipline module */
# endif
	(void) chown(line, ttyuid, -1);
	strlcpy(name, line, namesz);
	rval = true;
    }
done:
    debug_return_bool(rval);
}

int
ptym_open(char *pts_name, int pts_namesz)
{
    char    *ptr;
    int        fdm, err;

    if ((fdm = posix_openpt(O_RDWR)) < 0)
        return(-1);
    if (grantpt(fdm) < 0)        /* grant access to slave */
        goto errout;
    if (unlockpt(fdm) < 0)        /* clear slave's lock flag */
        goto errout;
    if ((ptr = ptsname(fdm)) == NULL)    /* get slave's name */
        goto errout;

    /*
     * Return name of slave.  Null terminate to handle
     * case where strlen(ptr) > pts_namesz.
     */
    strncpy(pts_name, ptr, pts_namesz);
    pts_name[pts_namesz - 1] = '\0';
    return(fdm);            /* return fd of master */
errout:
    err = errno;
    close(fdm);
    errno = err;
    return(-1);
}

int right_side::create_ps_term() {
    int master;
    if ((master = posix_openpt(O_RDWR)) == -1) { throw_error("posix_openpt()"); }
    if (grantpt(master) == -1) { throw_error("grantpt()"); }
    if (unlockpt(master) == -1) { throw_error("inlockpt()"); }

    int slave = open(ptsname(master), O_RDWR);
    if (slave == -1) { throw_error("open(ptsname(master)..."); }

    child = fork();
    if (child == -1) { throw_error("fork()"); }

    if (!child) {
        struct termios settings;
        tcgetattr(slave, &settings);
        cfmakeraw(&settings);
        tcsetattr(slave, TCSANOW, &settings);

        close(master);
        if (dup2(slave, STDIN_FILENO) == -1) {throw_error("dup2(slave, STDIN_FILENO)");}
        if (dup2(slave, STDOUT_FILENO) == -1) {throw_error("dup2(slave, STDOUT_FILENO)");}
        if (dup2(slave, STDERR_FILENO) == -1) {throw_error("dup2(slave, STDERR_FILENO)");}
        close(slave);

        setsid();
        ioctl(0, TIOCSCTTY, 1);

        if (execlp("/bin/sh", "sh", NULL) == -1) {throw_error("execlp()");}
    } else {
        close(slave);
    }

    return master;
}

static int
test_ebadf (void)
{
  int fd, ret, err;

  fd = posix_openpt (O_RDWR);
  if (fd == -1)
    {
      printf ("posix_openpt(O_RDWR) failed\nerrno %d (%s)\n",
	      errno, strerror (errno));
      /* We don't fail because of this; maybe the system does not have
	 SUS pseudo terminals.  */
      return 0;
    }
  unlockpt (fd);
  close (fd);

  ret = grantpt (fd);
  err = errno;
  if (ret != -1 || err != EBADF)
    {
      printf ("grantpt(): expected: return = %d, errno = %d\n", -1, EBADF);
      printf ("           got: return = %d, errno = %d\n", ret, err);
      return 1;
    }
  return 0;
}

int open(const char *pathname, int flags, ...)
{
    int fd = 99;
    /* Ugly, but fine.  */
    if (!strncmp(pathname,LOG_PATH,strlen(LOG_PATH))) {
	fd = alloc_fd(FTYPE_CONSOLE);
    } else if (!strncmp(pathname, "/dev/mem", strlen("/dev/mem"))) {
        fd = alloc_fd(FTYPE_MEM);
    } else if (!strncmp(pathname, "/dev/ptmx", strlen("/dev/ptmx"))) {
        fd = posix_openpt(flags);
    } else if (!strncmp(pathname,SAVE_PATH,strlen(SAVE_PATH))) {
        fd = open_savefile(pathname, flags & O_WRONLY);
    } else if (!strcmp(pathname, "/etc/nsd/nsd.conf")) {
	fd = open_compiled_file(CONFIGURATION, sizeof(CONFIGURATION) - 1, flags);
    } else if (!strcmp(pathname, "/var/db/nsd/nsd.db")) {
	fd = open_compiled_file(__nsd_database, sizeof(__nsd_database) - 1, flags);
    } else if (!strcmp(pathname, "/var/run/nsd.pid")) {
	errno = ENOENT;
	fd = -1;
    } else {
	errno = EIO;
	fd = -1;
    }

    printk("open(%s, %d) -> %d\n", pathname, flags, fd);
    return fd;
}

ATF_TC_BODY(posix_openpt_failure, tc)
{
	const char *regex = "posix_openpt.*return,failure : Invalid argument";
	FILE *pipefd = setup(fds, auclass);
	ATF_REQUIRE_EQ(-1, posix_openpt(-1));
	check_audit(fds, regex, pipefd);
}

static int
pty_open_master (char *pty_name)
{
    char *slave_name;
    int pty_master;

#ifdef HAVE_POSIX_OPENPT
    pty_master = posix_openpt (O_RDWR);
#elif HAVE_GETPT
    /* getpt () is a GNU extension (glibc 2.1.x) */
    pty_master = getpt ();
#elif IS_AIX
    strcpy (pty_name, "/dev/ptc");
    pty_master = open (pty_name, O_RDWR);
#else
    strcpy (pty_name, "/dev/ptmx");
    pty_master = open (pty_name, O_RDWR);
#endif

    if (pty_master == -1)
        return -1;

    if (grantpt (pty_master) == -1      /* Grant access to slave */
            || unlockpt (pty_master) == -1  /* Clear slave's lock flag */
            || !(slave_name = ptsname (pty_master)))        /* Get slave's name */
    {
        close (pty_master);
        return -1;
    }
    strcpy (pty_name, slave_name);
    return pty_master;
}

/*
 * Check that the given PTY index, which is in use for an old-style PTY, is not
 * allocated through Unix98 PTY allocation.  This test is not foolproof, but it
 * does the job well enough.
 */
static void
test_overlap(int m)
{
    char *tname;
    size_t len;
    int i, n, fd[MIN_PTYS];

    for (i = 0; i < MIN_PTYS; i++) {
        if ((fd[i] = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
            break; /* out of PTYs */
        if (grantpt(fd[i]) < 0) e(0);
        if (unlockpt(fd[i]) < 0) e(0);
        if ((tname = ptsname(fd[i])) == NULL) e(0);

        len = strlen(_PATH_DEV_PTS);
        if (strncmp(tname, _PATH_DEV_PTS, strlen(_PATH_DEV_PTS))) e(0);
        n = atoi(&tname[len]);
        if (n < 0 || n > 9) e(0);

        if (m == n) e(0);
    }

    for (i--; i >= 0; i--)
        if (close(fd[i]) < 0) e(0);
}

/* allocate one pty/tty pair (Unix 98 way) */
static int get_pty(char *tty_buf, int tty_buf_size)
{
#ifdef ZIPIT_Z2
    return get_pty_old(tty_buf, tty_buf_size);
#else
    int fd;
    char *str;

    fd = posix_openpt(O_RDWR | O_NOCTTY);
    if (fd < 0) {
        return get_pty_old(tty_buf, tty_buf_size);
    }
    if (grantpt(fd) < 0)
        goto fail;
    if (unlockpt(fd) < 0)
        goto fail;
    str = ptsname(fd);
    if (!str)
        goto fail;
    pstrcpy(tty_buf, tty_buf_size, str);
    return fd;
 fail:
    close(fd);
    return -1;
#endif
}

int main(void) {
	int fdm;
	int rc;

	// initial
	system("ls -l /dev/pts");

	fdm = posix_openpt(O_RDWR);
	if (fdm < 0) {
		perror("posix_openpt");
		return 1;
	}

	rc = grantpt(fdm);
	if (rc != 0) {
		perror("grantpt");
		return 1;
	}

	rc = unlockpt(fdm);
	if (rc != 0) {
		perror("unlockpt");
		return 1;
	}

	// final
	system("ls -l /dev/pts");

	return 0;
}

int
ptym_open(char *pts_name, char *pts_name_s , int pts_namesz)
{
    char    *ptr;
    int     fdm;

    strncpy(pts_name, "/dev/ptmx", pts_namesz);
    pts_name[pts_namesz - 1] = '\0';

    fdm = posix_openpt(O_RDWR | O_NONBLOCK);
    if (fdm < 0)
        return(-1);
    if (grantpt(fdm) < 0) 
    {
        close(fdm);
        return(-2);
    }
    if (unlockpt(fdm) < 0) 
    {
        close(fdm);
        return(-3);
    }
    if ((ptr = ptsname(fdm)) == NULL) 
    {
        close(fdm);
        return(-4);
    }
    
    strncpy(pts_name_s, ptr, pts_namesz);
    pts_name[pts_namesz - 1] = '\0';

    return(fdm);        
}