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 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
