1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #include <stdio.h>
29 #include <unistd.h>
30 #include <termios.h>
31 #include <sys/ioctl.h>
32 #include <errno.h>
33 #include <string.h>
34
ptsname_r(int fd,char * buf,size_t buflen)35 int ptsname_r( int fd, char* buf, size_t buflen)
36 {
37 unsigned int pty_num;
38 char buff[64];
39 int len;
40
41 if (buf == NULL) {
42 errno = EINVAL;
43 return -1;
44 }
45
46 if ( ioctl( fd, TIOCGPTN, &pty_num ) != 0 ) {
47 errno = ENOTTY;
48 return -1;
49 }
50
51 len = snprintf( buff, sizeof(buff), "/dev/pts/%u", pty_num );
52 if (len+1 > (int)buflen) {
53 errno = ERANGE;
54 return -1;
55 }
56 memcpy( buf, buff, len+1 );
57 return 0;
58 }
59