This is pty_sgttyb.c in view mode; [Download] [Up]
/* pty_bsd.c - routines to allocate ptys - BSD version
Written by: Don Libes, NIST, 2/6/90
Design and implementation of this program was paid for by U.S. tax
dollars. Therefore it is public domain. However, the author and NIST
would appreciate credit if this program or parts of it are used.
*/
#include <stdio.h> /* tmp for debugging */
#include <sys/types.h>
#include <sys/stat.h>
/*** #include <sys/ioctl.h> ***/
#include <sys/file.h>
#include <signal.h>
#include <setjmp.h>
#include <errno.h>
#include "exp_conf.h"
#include "exp_rename.h"
#include "exp_tty.h"
#include "exp_pty.h"
extern int errno;
void debuglog();
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
static char master_name[] = "/dev/ptyXX"; /* master */
static char slave_name[] = "/dev/ttyXX"; /* slave */
static char *tty_type; /* ptr to char [pt] denoting
whether it is a pty or tty */
static char *tty_bank; /* ptr to char [p-z] denoting
which bank it is */
static char *tty_num; /* ptr to char [0-f] denoting
which number it is */
static void
pty_stty(s,name)
char *s; /* args to stty */
char *name; /* name of pty */
{
int cc;
#define MAX_ARGLIST 10240
char buf[MAX_ARGLIST]; /* overkill is easier */
/* tell Saber to shut up over confusion of sprintf return type */
/*SUPPRESS 701*/
sprintf(buf,"stty %s < %s > %s",s,name,name);
debuglog("getptyslave: system(\"%s\") = ",buf);
cc = system(buf);
debuglog("%d\n",cc);
}
int exp_dev_tty; /* file descriptor to /dev/tty or -1 if none */
int knew_dev_tty; /* true if we had our hands on /dev/tty at any time */
#define GET_TTYTYPE 0
#define SET_TTYTYPE 1
static void
ttytype(request,fd,ttycopy,ttyinit,s)
int request;
int fd;
/* following are used only if request == SET_TTYTYPE */
int ttycopy; /* if true, copy from /dev/tty */
int ttyinit; /* if true, initialize to sane state */
char *s; /* stty args */
{
static struct tchars tc; /* special characters */
static struct ltchars lc; /* local special characters */
static struct winsize win; /* window size */
static int lb; /* local modes */
static int l; /* line discipline */
if (request == GET_TTYTYPE) {
if (-1 == ioctl(fd, TIOCGETP, (char *)&exp_tty_original)
|| -1 == ioctl(fd, TIOCGETC, (char *)&tc)
|| -1 == ioctl(fd, TIOCGETD, (char *)&l)
|| -1 == ioctl(fd, TIOCGLTC, (char *)&lc)
|| -1 == ioctl(fd, TIOCLGET, (char *)&lb)
|| -1 == ioctl(fd, TIOCGWINSZ, (char *)&win)) {
knew_dev_tty = FALSE;
exp_dev_tty = -1;
}
} else { /* type == SET_TTYTYPE */
if (ttycopy && knew_dev_tty) {
(void) ioctl(fd, TIOCSETP, (char *)&exp_tty_original);
(void) ioctl(fd, TIOCSETC, (char *)&tc);
(void) ioctl(fd, TIOCSLTC, (char *)&lc);
(void) ioctl(fd, TIOCLSET, (char *)&lb);
(void) ioctl(fd, TIOCSETD, (char *)&l);
(void) ioctl(fd, TIOCSWINSZ, (char *)&win);
}
#ifdef __SABER__
#undef DFLT_STTY
#define DFLT_STTY "sane"
#endif
if (ttyinit) {
/* overlay parms originally supplied by Makefile */
debuglog("getptyslave: (default) stty %s\n",DFLT_STTY);
pty_stty(DFLT_STTY,slave_name);
}
/* lastly, give user chance to override any terminal parms */
if (s) {
debuglog("getptyslave: (user-requested) stty %s\n",s);
pty_stty(s,slave_name);
}
}
}
void
init_pty()
{
tty_type = & slave_name[strlen("/dev/")];
tty_bank = &master_name[strlen("/dev/pty")];
tty_num = &master_name[strlen("/dev/ptyp")];
exp_dev_tty = open("/dev/tty",O_RDWR);
#if experimental
/* code to allocate force expect to get a controlling tty */
/* even if it doesn't start with one (i.e., under cron). */
/* This code is not necessary, but helpful for testing odd things. */
if (exp_dev_tty == -1) {
/* give ourselves a controlling tty */
int master = getptymaster();
fcntl(master,F_SETFD,1); /* close-on-exec */
setpgrp(0,0);
close(0);
close(1);
getptyslave(get_var("stty_init"));
close(2);
fcntl(0,F_DUPFD,2); /* dup 0 onto 2 */
}
#endif
knew_dev_tty = (exp_dev_tty != -1);
if (knew_dev_tty) ttytype(GET_TTYTYPE,exp_dev_tty,0,0,(char *)0);
}
/* returns fd of master end of pseudotty */
int
getptymaster()
{
int master = -1;
char *hex, *bank;
struct stat statbuf;
if (exp_pty_test_start() == -1) return -1;
for (bank = "pqrstuvwxyzPQRSTUVWXYZ";*bank;bank++) {
*tty_bank = *bank;
*tty_num = '0';
if (stat(master_name, &statbuf) < 0) break;
for (hex = "0123456789abcdef";*hex;hex++) {
*tty_num = *hex;
/* generate slave name from master */
strcpy(slave_name,master_name);
*tty_type = 't';
master = exp_pty_test(master_name,slave_name,
*tty_bank,*tty_num);
if (master >= 0) goto done;
}
}
done:
exp_pty_test_end();
return(master);
}
int
getptyslave(ttycopy,ttyinit,stty_args)
int ttycopy;
int ttyinit;
char *stty_args;
{
int slave;
if (0 > (slave = open(slave_name, O_RDWR))) return(-1);
/* sanity check - if slave not 0, skip rest of this and return */
/* to what will later be detected as an error in caller */
if (0 != slave) return(slave);
fcntl(0,F_DUPFD,1); /* duplicate 0 onto 1 to prepare for stty */
ttytype(SET_TTYTYPE,slave,ttycopy,ttyinit,stty_args);
(void) exp_pty_unlock();
return(slave);
}
#if 0
opendevtty()
{
int fd;
int p;
errorlog("--opendevtty--\n");
errorlog("pid = %d\n",getpid());
errorlog("pgrp = %d\n",getpgrp(0));
ioctl(0,TIOCGPGRP,&p);
errorlog("tgrp(0) = %d\n",p);
if (-1 == (fd = open("/dev/tty",2))) {
perror("open"); errorlog("sanity open failed\n");
} else errorlog("sanity open succeeded\n");
}
#endif
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.