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 <machine/stdint.h> 45 #include <sys/stat.h> 46 #include <sys/ioctl.h> 47 #include "reentrant.h" 48 #include "un-namespace.h" 49 50 #include "libc_private.h" 51 52 #define TTYNAME_DEVFS_COMPAT 1 53 54 static char ptsname_buf[sizeof(_PATH_DEV) + NAME_MAX]; 55 56 static once_t ptsname_init_once = ONCE_INITIALIZER; 57 static thread_key_t ptsname_key; 58 static int ptsname_keycreated = 0; 59 60 static int 61 __isptmaster(int fd) 62 { 63 int error; 64 65 error = _ioctl(fd, TIOCISPTMASTER); 66 if ((error) && (errno != EBADF)) 67 errno = EINVAL; 68 69 return error; 70 } 71 72 static void 73 ptsname_keycreate(void) 74 { 75 ptsname_keycreated = (thr_keycreate(&ptsname_key, free) == 0); 76 } 77 78 char * 79 ptsname(int fd) 80 { 81 int error; 82 size_t used; 83 char *buf; 84 85 error = __isptmaster(fd); 86 if (error) 87 return (NULL); 88 89 if (thr_main() != 0) 90 buf = ptsname_buf; 91 else { 92 if (thr_once(&ptsname_init_once, ptsname_keycreate) != 0 || 93 !ptsname_keycreated) 94 return (NULL); 95 if ((buf = thr_getspecific(ptsname_key)) == NULL) { 96 if ((buf = malloc(sizeof ptsname_buf)) == NULL) 97 return (NULL); 98 if (thr_setspecific(ptsname_key, buf) != 0) { 99 free(buf); 100 return (NULL); 101 } 102 } 103 } 104 105 strcpy(buf, "/dev/"); 106 used = strlen(buf); 107 108 if (((error = fdevname_r(fd, buf+used, sizeof(ptsname_buf)-used))) != 0) { 109 errno = error; 110 return (NULL); 111 } 112 113 buf[used+2] = 's'; 114 115 return (buf); 116 } 117 118 int 119 posix_openpt(int oflag) 120 { 121 return open("/dev/ptmx", oflag); 122 } 123 124 int 125 unlockpt(int fd) 126 { 127 return __isptmaster(fd); 128 } 129 130 int 131 grantpt(int fd) 132 { 133 return __isptmaster(fd); 134 } 135