minix/commands/telnetd/pty.c
2009-11-09 10:26:00 +00:00

78 lines
1.7 KiB
C

/*
* TNET A server program for MINIX which implements the TCP/IP
* suite of networking protocols. It is based on the
* TCP/IP code written by Phil Karn et al, as found in
* his NET package for Packet Radio communications.
*
* Handle the allocation of a PTY.
*
* Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
*/
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include "telnetd.h"
#define DEV_DIR "/dev"
/*
* Allocate a PTY, by trying to open one repeatedly,
* until all PTY channels are done. If at that point
* no PTY is found, go into panic mode :-(
*/
int get_pty(pty_fdp, tty_namep)
int *pty_fdp;
char **tty_namep;
{
char buff[128], temp[128];
register int i, j;
int pty_fd;
static char tty_name[128];
for(i = 'p'; i < 'w'; i++) {
j = 0;
do {
sprintf(buff, "%s/pty%c%c",
DEV_DIR, i, (j < 10) ? j + '0' : j + 'a' - 10);
if (opt_d == 1) {
(void) write(2, "Testing: ", 9);
(void) write(2, buff, strlen(buff));
(void) write(2, "...: ", 5);
}
pty_fd = open(buff, O_RDWR);
if (opt_d == 1) {
if (pty_fd < 0) sprintf(temp, "error %d\r\n", errno);
else sprintf(temp, "OK\r\n");
(void) write(2, temp, strlen(temp));
}
if (pty_fd >= 0) break;
j++;
if (j == 16) break;
} while(1);
/* Did we find one? */
if (j < 16) break;
}
if (pty_fd < 0) return(-1);
if (opt_d == 1) {
sprintf(temp, "File %s, desc %d\n", buff, pty_fd);
(void) write(1, temp, strlen(temp));
}
sprintf(tty_name, "%s/tty%c%c", DEV_DIR,
i, (j < 10) ? j + '0' : j + 'a' - 10);
*pty_fdp = pty_fd;
*tty_namep = tty_name;
return(0);
}