www.pudn.com > telnet.rar > pty_fun.c, change:2013-01-28,size:3858b

#include "pty_fun.h"    
 
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 lenth > pts_namesz  
     * */   
   
    strncpy(pts_name, "/dev/ptmx", pts_namesz);   
    pts_name[pts_namesz - 1] = '\0';   
   
    fdm = posix_openpt(O_RDWR);   
    if (fdm < 0)   
        return OPEN_PTY_ERR;   
    if (grantpt(fdm) < 0)   
    {   
        close(fdm);   
        return GRANT_PTY_ERR;   
    }   
    if (unlockpt(fdm) < 0)   
    {   
        close(fdm);   
        return UNLOCK_PTY_ERR;   
    }   
    //if ((ptr = ptsname(fdm)) == NULL)   
    if ((ptr = ptsname(fdm)) == NULL)   
    {   
        close(fdm);   
        return GET_PTYS_NAME_ERR;   
    }   
    strncpy(pts_name, ptr, pts_namesz);   
    pts_name[pts_namesz - 1] = '\0';   
   
    return fdm;   
   
}   
   
int ptys_open(char *pts_name)   
{   
    int fds;   
    if ((fds = open(pts_name, O_RDWR|O_NONBLOCK|O_CREAT)) < 0)   
        return OPEN_PTYS_ERR;   
    return fds;   
}   
   
int pty_fork(int *ptrfdm, char *slave_name, int slave_namesz,   
        const struct termios *slave_termiors,   
        const struct winsize *slave_winsize, pid_t *ppid)   
{   
    int fdm, fds;   
    pid_t pid;   
    char pts_name[20];   
   
    if ((fdm = ptym_open(pts_name, sizeof(pts_name))) < 0)   
    {   
        return fdm;   
    }   
   
    if (slave_name != NULL)   
    {   
        strncpy(slave_name, pts_name, slave_namesz);   
        slave_name[slave_namesz - 1] = '\0';   
    }   
   
    if ((pid = fork()) < 0)   
    {   
        return FORK_ERR;   
    }   
    else if (pid == 0)   
    {   
        if (setsid() < 0)   
        {   
            return SETSID_ERR;   
        }   
	//printf("112222pts_name = %s\n", pts_name); 
 
        if ((fds = ptys_open(pts_name)) < 0)   
        {   
        	printf("1122errr\n"); 
		fflush(NULL); 
            close(fdm);   
            return OPEN_PTYS_ERR;   
        }   
	//printf("fds = %d\n",fds); 
	//fflush(NULL); 
#ifdef TIOCSCTTY    
        if (ioctl(fds, TIOCSCTTY, (char *) 0) < 0)   
            return TIOCSCTTY_ERR;   
#endif    
	//      if (slave_termiors != NULL)    
	//      {    
	//          if (tcsetattr(fds, TCSANOW, slave_termiors) < 0)    
	//              return INIT_ATTR_ERR;    
	//      }    
	//      if (slave_winsize != NULL)    
	//      {    
	//          if (ioctl(fds, TIOCSWINSZ, slave_winsize) < 0)    
	//              return INIT_ATTR_ERR;    
	//      }    
 
	#if 0 
	close(0); 
	close(1); 
	close(2); 
	#endif 
 	#if 0 
       if (dup2(fds, STDIN_FILENO) != STDIN_FILENO)   
           return DUP_STDIN_ERR;   
        if (dup2(fds, STDOUT_FILENO) != STDOUT_FILENO)   
            return DUP_STDOUT_ERR;   
        if (dup2(fds, STDERR_FILENO) != STDERR_FILENO)   
            return DUP_STDERR_ERR;   
	#endif 
	#if 1 
       if (dup2(fds, 0) != STDIN_FILENO)  
	   	printf("STDIN_FILENO = %d\n", STDIN_FILENO); 
         //  return DUP_STDIN_ERR;   
        if (dup2(fds, 1) != STDOUT_FILENO)   
				   	printf("STDOUT_FILENO = %d\n", STDOUT_FILENO); 
          //  return DUP_STDOUT_ERR;   
        if (dup2(fds, 2) != STDERR_FILENO)   
				   	printf("STDERR_FILENO = %d\n", STDERR_FILENO); 
          //  return DUP_STDERR_ERR;   
	#endif 
	#if 0 
        if (fds != STDIN_FILENO && fds != STDOUT_FILENO && fds != STDERR_FILENO)   
        {   
        	printf("111STDERR_FILENO = %d\n", STDERR_FILENO); 
            close(fds);   
        }   
	#endif 
		printf("333fds = %dxxxxxxxxx\n", fds); 
        *ppid = 0;   
        return 0;   
   
    }   
    else   
    {   
        *ptrfdm =fdm;   
        *ppid = pid;   
        return 0;   
    }   
}