1 /* 2 * QEMU low level functions 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #include <stdlib.h> 25 #include <stdio.h> 26 #include <stdarg.h> 27 #include <string.h> 28 #include <errno.h> 29 #include <unistd.h> 30 #include <fcntl.h> 31 32 /* Needed early for CONFIG_BSD etc. */ 33 #include "config-host.h" 34 35 #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) 36 #include <sys/mman.h> 37 #endif 38 39 #ifdef CONFIG_SOLARIS 40 #include <sys/types.h> 41 #include <sys/statvfs.h> 42 /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for 43 discussion about Solaris header problems */ 44 extern int madvise(caddr_t, size_t, int); 45 #endif 46 47 #ifdef _WIN32 48 #include <windows.h> 49 #elif defined(CONFIG_BSD) 50 #include <stdlib.h> 51 #else 52 #include <malloc.h> 53 #endif 54 55 #ifdef CONFIG_ANDROID 56 #ifdef WIN32 57 #include <winsock2.h> 58 #include <stdint.h> 59 typedef int32_t socklen_t; 60 #else 61 #include <sys/socket.h> 62 #endif 63 #endif /* CONFIG_ANDROID */ 64 65 #include "qemu-common.h" 66 #include "sysemu.h" 67 #include "qemu_socket.h" 68 69 int qemu_madvise(void *addr, size_t len, int advice) 70 { 71 if (advice == QEMU_MADV_INVALID) { 72 errno = EINVAL; 73 return -1; 74 } 75 #if defined(CONFIG_MADVISE) 76 return madvise(addr, len, advice); 77 #elif defined(CONFIG_POSIX_MADVISE) 78 return posix_madvise(addr, len, advice); 79 #else 80 errno = EINVAL; 81 return -1; 82 #endif 83 } 84 85 86 /* 87 * Opens a file with FD_CLOEXEC set 88 */ 89 int qemu_open(const char *name, int flags, ...) 90 { 91 int ret; 92 int mode = 0; 93 94 if (flags & O_CREAT) { 95 va_list ap; 96 97 va_start(ap, flags); 98 mode = va_arg(ap, int); 99 va_end(ap); 100 } 101 102 #ifdef O_CLOEXEC 103 ret = open(name, flags | O_CLOEXEC, mode); 104 #else 105 ret = open(name, flags, mode); 106 if (ret >= 0) { 107 qemu_set_cloexec(ret); 108 } 109 #endif 110 111 return ret; 112 } 113 114 /* 115 * A variant of write(2) which handles partial write. 116 * 117 * Return the number of bytes transferred. 118 * Set errno if fewer than `count' bytes are written. 119 * 120 * This function don't work with non-blocking fd's. 121 * Any of the possibilities with non-bloking fd's is bad: 122 * - return a short write (then name is wrong) 123 * - busy wait adding (errno == EAGAIN) to the loop 124 */ 125 ssize_t qemu_write_full(int fd, const void *buf, size_t count) 126 { 127 ssize_t ret = 0; 128 ssize_t total = 0; 129 130 while (count) { 131 ret = write(fd, buf, count); 132 if (ret < 0) { 133 if (errno == EINTR) 134 continue; 135 break; 136 } 137 138 count -= ret; 139 buf += ret; 140 total += ret; 141 } 142 143 return total; 144 } 145 146 /* 147 * Opens a socket with FD_CLOEXEC set 148 */ 149 int qemu_socket(int domain, int type, int protocol) 150 { 151 int ret; 152 153 #ifdef SOCK_CLOEXEC 154 ret = socket(domain, type | SOCK_CLOEXEC, protocol); 155 if (ret != -1 || errno != EINVAL) { 156 return ret; 157 } 158 #endif 159 ret = socket(domain, type, protocol); 160 if (ret >= 0) { 161 qemu_set_cloexec(ret); 162 } 163 164 return ret; 165 } 166 167 /* 168 * Accept a connection and set FD_CLOEXEC 169 */ 170 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) 171 { 172 int ret; 173 174 #ifdef CONFIG_ACCEPT4 175 ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); 176 if (ret != -1 || errno != ENOSYS) { 177 return ret; 178 } 179 #endif 180 ret = accept(s, addr, addrlen); 181 if (ret >= 0) { 182 qemu_set_cloexec(ret); 183 } 184 185 return ret; 186 } 187 188 #ifdef WIN32 189 int asprintf( char **, char *, ... ); 190 int vasprintf( char **, char *, va_list ); 191 192 int vasprintf( char **sptr, char *fmt, va_list argv ) 193 { 194 int wanted = vsnprintf( *sptr = NULL, 0, fmt, argv ); 195 if( (wanted > 0) && ((*sptr = malloc( 1 + wanted )) != NULL) ) 196 return vsprintf( *sptr, fmt, argv ); 197 198 return wanted; 199 } 200 201 int asprintf( char **sptr, char *fmt, ... ) 202 { 203 int retval; 204 va_list argv; 205 va_start( argv, fmt ); 206 retval = vasprintf( sptr, fmt, argv ); 207 va_end( argv ); 208 return retval; 209 } 210 #endif 211
