1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "namespace.h" 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <sys/ioctl.h> 44 #include <sys/filio.h> 45 #include <fcntl.h> 46 #include <dirent.h> 47 #include <stdlib.h> 48 #include <termios.h> 49 #include <unistd.h> 50 #include <string.h> 51 #include <paths.h> 52 #include <pthread.h> 53 #include "un-namespace.h" 54 55 #include "libc_private.h" 56 57 static char ttyname_buf[sizeof(_PATH_DEV) + MAXNAMLEN]; 58 59 static pthread_mutex_t ttyname_lock = PTHREAD_MUTEX_INITIALIZER; 60 static pthread_key_t ttyname_key; 61 static int ttyname_init = 0; 62 63 char * 64 ttyname_r(int fd, char *buf, size_t len) 65 { 66 struct stat sb; 67 char *rval; 68 struct fiodgname_arg fgn; 69 70 rval = NULL; 71 *buf = '\0'; 72 73 /* Must be a terminal. */ 74 if (!isatty(fd)) 75 return (rval); 76 /* Must be a character device. */ 77 if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode)) 78 return (rval); 79 /* Must have enough room */ 80 if (len <= sizeof(_PATH_DEV)) 81 return (rval); 82 83 strcpy(buf, _PATH_DEV); 84 fgn.len = len - strlen(buf); 85 fgn.buf = buf + strlen(buf); 86 if (!_ioctl(fd, FIODGNAME, &fgn)) 87 return(buf); 88 devname_r(sb.st_rdev, S_IFCHR, 89 buf + strlen(buf), sizeof(buf) - strlen(buf)); 90 return (buf); 91 } 92 93 char * 94 ttyname(int fd) 95 { 96 char *buf; 97 98 if (__isthreaded == 0) 99 return (ttyname_r(fd, ttyname_buf, sizeof ttyname_buf)); 100 101 if (ttyname_init == 0) { 102 _pthread_mutex_lock(&ttyname_lock); 103 if (ttyname_init == 0) { 104 if (_pthread_key_create(&ttyname_key, free)) { 105 _pthread_mutex_unlock(&ttyname_lock); 106 return (NULL); 107 } 108 ttyname_init = 1; 109 } 110 _pthread_mutex_unlock(&ttyname_lock); 111 } 112 113 /* Must have thread specific data field to put data */ 114 if ((buf = _pthread_getspecific(ttyname_key)) == NULL) { 115 if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) { 116 if (_pthread_setspecific(ttyname_key, buf) != 0) { 117 free(buf); 118 return (NULL); 119 } 120 } else { 121 return (NULL); 122 } 123 } 124 return (ttyname_r(fd, buf, sizeof(_PATH_DEV) + MAXNAMLEN)); 125 } 126 127