1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Alex Hornung <ahornung@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 #include "namespace.h" 35 #include <sys/types.h> 36 #include <fcntl.h> 37 #include <dirent.h> 38 #include <stdlib.h> 39 #include <termios.h> 40 #include <unistd.h> 41 #include <string.h> 42 #include <paths.h> 43 #include <errno.h> 44 #include <limits.h> 45 #include <machine/stdint.h> 46 #include <sys/stat.h> 47 #include <sys/ioctl.h> 48 #include "reentrant.h" 49 #include "un-namespace.h" 50 51 #include "libc_private.h" 52 53 #define TTYNAME_DEVFS_COMPAT 1 54 55 static char ptsname_buf[sizeof(_PATH_DEV) + NAME_MAX]; 56 57 static once_t ptsname_init_once = ONCE_INITIALIZER; 58 static thread_key_t ptsname_key; 59 static int ptsname_keycreated = 0; 60 61 static int 62 __isptmaster(int fd) 63 { 64 int error; 65 66 error = _ioctl(fd, TIOCISPTMASTER); 67 if ((error) && (errno != EBADF)) 68 errno = EINVAL; 69 70 return error; 71 } 72 73 static void 74 ptsname_keycreate(void) 75 { 76 ptsname_keycreated = (thr_keycreate(&ptsname_key, free) == 0); 77 } 78 79 char * 80 ptsname(int fd) 81 { 82 int error; 83 size_t used; 84 char *buf; 85 86 error = __isptmaster(fd); 87 if (error) 88 return (NULL); 89 90 if (thr_main() != 0) 91 buf = ptsname_buf; 92 else { 93 if (thr_once(&ptsname_init_once, ptsname_keycreate) != 0 || 94 !ptsname_keycreated) 95 return (NULL); 96 if ((buf = thr_getspecific(ptsname_key)) == NULL) { 97 if ((buf = malloc(sizeof ptsname_buf)) == NULL) 98 return (NULL); 99 if (thr_setspecific(ptsname_key, buf) != 0) { 100 free(buf); 101 return (NULL); 102 } 103 } 104 } 105 106 strcpy(buf, "/dev/"); 107 used = strlen(buf); 108 109 if (((error = fdevname_r(fd, buf+used, sizeof(ptsname_buf)-used))) != 0) { 110 errno = error; 111 return (NULL); 112 } 113 114 buf[used+2] = 's'; 115 116 return (buf); 117 } 118 119 int 120 posix_openpt(int oflag) 121 { 122 return _open("/dev/ptmx", oflag); 123 } 124 125 int 126 unlockpt(int fd) 127 { 128 return __isptmaster(fd); 129 } 130 131 int 132 grantpt(int fd) 133 { 134 return __isptmaster(fd); 135 } 136