David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 1 | /* |
| 2 | * os-posix-lib.c |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright (c) 2010 Red Hat, Inc. |
| 6 | * |
| 7 | * QEMU library functions on POSIX which are shared between QEMU and |
| 8 | * the QEMU tools. |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 26 | * THE SOFTWARE. |
| 27 | */ |
| 28 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 29 | /* The following block of code temporarily renames the daemon() function so the |
| 30 | compiler does not see the warning associated with it in stdlib.h on OSX */ |
| 31 | #ifdef __APPLE__ |
| 32 | #define daemon qemu_fake_daemon_function |
| 33 | #include <stdlib.h> |
| 34 | #undef daemon |
| 35 | extern int daemon(int, int); |
| 36 | #endif |
| 37 | |
| 38 | #if defined(__linux__) && (defined(__x86_64__) || defined(__arm__)) |
| 39 | /* Use 2 MiB alignment so transparent hugepages can be used by KVM. |
| 40 | Valgrind does not support alignments larger than 1 MiB, |
| 41 | therefore we need special code which handles running on Valgrind. */ |
| 42 | # define QEMU_VMALLOC_ALIGN (512 * 4096) |
| 43 | #elif defined(__linux__) && defined(__s390x__) |
| 44 | /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ |
| 45 | # define QEMU_VMALLOC_ALIGN (256 * 4096) |
| 46 | #else |
| 47 | # define QEMU_VMALLOC_ALIGN getpagesize() |
| 48 | #endif |
| 49 | |
| 50 | #include "config-host.h" |
| 51 | #ifndef CONFIG_ANDROID |
| 52 | #include <glib/gprintf.h> |
| 53 | #endif |
| 54 | |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 55 | #include "config-host.h" |
David 'Digit' Turner | 34c48ff | 2013-12-15 00:25:03 +0100 | [diff] [blame] | 56 | #include "sysemu/sysemu.h" |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 57 | #include "trace.h" |
David 'Digit' Turner | d0edecb | 2013-12-17 09:32:26 +0100 | [diff] [blame] | 58 | #include "qemu/sockets.h" |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 59 | #include <sys/mman.h> |
| 60 | |
| 61 | #ifdef CONFIG_LINUX |
| 62 | #include <sys/syscall.h> |
| 63 | #endif |
| 64 | |
| 65 | int qemu_get_thread_id(void) |
| 66 | { |
| 67 | #if defined(__linux__) |
| 68 | return syscall(SYS_gettid); |
| 69 | #else |
| 70 | return getpid(); |
| 71 | #endif |
| 72 | } |
| 73 | |
| 74 | int qemu_daemon(int nochdir, int noclose) |
| 75 | { |
| 76 | return daemon(nochdir, noclose); |
| 77 | } |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 78 | |
| 79 | void *qemu_oom_check(void *ptr) |
| 80 | { |
| 81 | if (ptr == NULL) { |
| 82 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); |
| 83 | abort(); |
| 84 | } |
| 85 | return ptr; |
| 86 | } |
| 87 | |
| 88 | void *qemu_memalign(size_t alignment, size_t size) |
| 89 | { |
| 90 | void *ptr; |
| 91 | #if defined(_POSIX_C_SOURCE) && !defined(__sun__) |
| 92 | int ret; |
| 93 | ret = posix_memalign(&ptr, alignment, size); |
| 94 | if (ret != 0) { |
| 95 | fprintf(stderr, "Failed to allocate %zu B: %s\n", |
| 96 | size, strerror(ret)); |
| 97 | abort(); |
| 98 | } |
| 99 | #elif defined(CONFIG_BSD) |
| 100 | ptr = qemu_oom_check(valloc(size)); |
| 101 | #else |
| 102 | ptr = qemu_oom_check(memalign(alignment, size)); |
| 103 | #endif |
| 104 | //trace_qemu_memalign(alignment, size, ptr); |
| 105 | return ptr; |
| 106 | } |
| 107 | |
| 108 | /* alloc shared memory pages */ |
| 109 | void *qemu_vmalloc(size_t size) |
| 110 | { |
| 111 | return qemu_memalign(getpagesize(), size); |
| 112 | } |
| 113 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 114 | /* alloc shared memory pages */ |
| 115 | void *qemu_anon_ram_alloc(size_t size) |
| 116 | { |
| 117 | size_t align = QEMU_VMALLOC_ALIGN; |
| 118 | size_t total = size + align - getpagesize(); |
| 119 | void *ptr = mmap(0, total, PROT_READ | PROT_WRITE, |
| 120 | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); |
| 121 | size_t offset = QEMU_ALIGN_UP((uintptr_t)ptr, align) - (uintptr_t)ptr; |
| 122 | |
| 123 | if (ptr == MAP_FAILED) { |
| 124 | return NULL; |
| 125 | } |
| 126 | |
| 127 | ptr += offset; |
| 128 | total -= offset; |
| 129 | |
| 130 | if (offset > 0) { |
| 131 | munmap(ptr - offset, offset); |
| 132 | } |
| 133 | if (total > size) { |
| 134 | munmap(ptr + size, total - size); |
| 135 | } |
| 136 | |
| 137 | //trace_qemu_anon_ram_alloc(size, ptr); |
| 138 | return ptr; |
| 139 | } |
| 140 | |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 141 | void qemu_vfree(void *ptr) |
| 142 | { |
| 143 | //trace_qemu_vfree(ptr); |
| 144 | free(ptr); |
| 145 | } |
| 146 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 147 | void qemu_anon_ram_free(void *ptr, size_t size) |
| 148 | { |
| 149 | //trace_qemu_anon_ram_free(ptr, size); |
| 150 | if (ptr) { |
| 151 | munmap(ptr, size); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | void qemu_set_block(int fd) |
| 156 | { |
| 157 | int f; |
| 158 | f = fcntl(fd, F_GETFL); |
| 159 | fcntl(fd, F_SETFL, f & ~O_NONBLOCK); |
| 160 | } |
| 161 | |
| 162 | void qemu_set_nonblock(int fd) |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 163 | { |
| 164 | int f; |
| 165 | f = fcntl(fd, F_GETFL); |
| 166 | fcntl(fd, F_SETFL, f | O_NONBLOCK); |
| 167 | } |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 168 | |
| 169 | int socket_set_fast_reuse(int fd) |
| 170 | { |
| 171 | #ifdef CONFIG_ANDROID |
| 172 | return socket_set_xreuseaddr(fd); |
| 173 | #else |
| 174 | int val = 1, ret; |
| 175 | |
| 176 | ret = qemu_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, |
| 177 | (const char *)&val, sizeof(val)); |
| 178 | |
| 179 | assert(ret == 0); |
| 180 | |
| 181 | return ret; |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 182 | #endif |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 183 | } |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 184 | |
| 185 | void qemu_set_cloexec(int fd) |
| 186 | { |
| 187 | int f; |
| 188 | f = fcntl(fd, F_GETFD); |
| 189 | fcntl(fd, F_SETFD, f | FD_CLOEXEC); |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Creates a pipe with FD_CLOEXEC set on both file descriptors |
| 194 | */ |
| 195 | int qemu_pipe(int pipefd[2]) |
| 196 | { |
| 197 | int ret; |
| 198 | |
| 199 | #ifdef CONFIG_PIPE2 |
| 200 | ret = pipe2(pipefd, O_CLOEXEC); |
| 201 | if (ret != -1 || errno != ENOSYS) { |
| 202 | return ret; |
| 203 | } |
| 204 | #endif |
| 205 | ret = pipe(pipefd); |
| 206 | if (ret == 0) { |
| 207 | qemu_set_cloexec(pipefd[0]); |
| 208 | qemu_set_cloexec(pipefd[1]); |
| 209 | } |
| 210 | |
| 211 | return ret; |
| 212 | } |
| 213 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 214 | int qemu_utimens(const char *path, const struct timespec *times) |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 215 | { |
| 216 | struct timeval tv[2], tv_now; |
| 217 | struct stat st; |
| 218 | int i; |
| 219 | #ifdef CONFIG_UTIMENSAT |
| 220 | int ret; |
| 221 | |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 222 | ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW); |
David 'Digit' Turner | 088edf8 | 2011-05-09 15:59:28 +0200 | [diff] [blame] | 223 | if (ret != -1 || errno != ENOSYS) { |
| 224 | return ret; |
| 225 | } |
| 226 | #endif |
| 227 | /* Fallback: use utimes() instead of utimensat() */ |
| 228 | |
| 229 | /* happy if special cases */ |
| 230 | if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) { |
| 231 | return 0; |
| 232 | } |
| 233 | if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) { |
| 234 | return utimes(path, NULL); |
| 235 | } |
| 236 | |
| 237 | /* prepare for hard cases */ |
| 238 | if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) { |
| 239 | gettimeofday(&tv_now, NULL); |
| 240 | } |
| 241 | if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) { |
| 242 | stat(path, &st); |
| 243 | } |
| 244 | |
| 245 | for (i = 0; i < 2; i++) { |
| 246 | if (times[i].tv_nsec == UTIME_NOW) { |
| 247 | tv[i].tv_sec = tv_now.tv_sec; |
| 248 | tv[i].tv_usec = tv_now.tv_usec; |
| 249 | } else if (times[i].tv_nsec == UTIME_OMIT) { |
| 250 | tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime; |
| 251 | tv[i].tv_usec = 0; |
| 252 | } else { |
| 253 | tv[i].tv_sec = times[i].tv_sec; |
| 254 | tv[i].tv_usec = times[i].tv_nsec / 1000; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | return utimes(path, &tv[0]); |
| 259 | } |
David 'Digit' Turner | 6731cf5 | 2014-01-16 18:15:41 +0100 | [diff] [blame] | 260 | |
| 261 | char * |
| 262 | qemu_get_local_state_pathname(const char *relative_pathname) |
| 263 | { |
| 264 | #ifdef CONFIG_ANDROID |
| 265 | return NULL; |
| 266 | #else |
| 267 | return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR, |
| 268 | relative_pathname); |
| 269 | #endif |
| 270 | } |