Advanced Programming in the UNIX® Environment

ptg10805159

Section 19.3 Opening Pseudo-Terminal Devices 725

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

ptys_open(char *pts_name)

{

int fds;

#if defined(SOLARIS)

int err, setup;

#endif

if ((fds = open(pts_name, O_RDWR)) < 0)

return(-1);

#if defined(SOLARIS)

/*

*Check if stream is already set up by autopush facility.

*/

if ((setup = ioctl(fds, I_FIND, "ldterm")) < 0)

goto errout;

if (setup == 0) {

if (ioctl(fds, I_PUSH, "ptem") < 0)

goto errout;

if (ioctl(fds, I_PUSH, "ldterm") < 0)

goto errout;