Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +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 | |
Alexandre Raymond | f97742d | 2011-06-06 23:34:10 -0400 | [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 | |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 38 | #if defined(__linux__) && defined(__x86_64__) |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 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. */ |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 42 | # define QEMU_VMALLOC_ALIGN (512 * 4096) |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 43 | # define CONFIG_VALGRIND |
Christian Borntraeger | fdec991 | 2012-06-15 05:10:30 +0000 | [diff] [blame] | 44 | #elif defined(__linux__) && defined(__s390x__) |
| 45 | /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ |
| 46 | # define QEMU_VMALLOC_ALIGN (256 * 4096) |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 47 | #else |
| 48 | # define QEMU_VMALLOC_ALIGN getpagesize() |
| 49 | #endif |
| 50 | |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 51 | #include "config-host.h" |
| 52 | #include "sysemu.h" |
| 53 | #include "trace.h" |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 54 | #include "qemu_socket.h" |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 55 | |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 56 | #if defined(CONFIG_VALGRIND) |
| 57 | static int running_on_valgrind = -1; |
| 58 | #else |
| 59 | # define running_on_valgrind 0 |
| 60 | #endif |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 61 | #ifdef CONFIG_LINUX |
| 62 | #include <sys/syscall.h> |
| 63 | #endif |
| 64 | #ifdef CONFIG_EVENTFD |
| 65 | #include <sys/eventfd.h> |
| 66 | #endif |
| 67 | |
| 68 | int qemu_get_thread_id(void) |
| 69 | { |
| 70 | #if defined(__linux__) |
| 71 | return syscall(SYS_gettid); |
| 72 | #else |
| 73 | return getpid(); |
| 74 | #endif |
| 75 | } |
Alexandre Raymond | f97742d | 2011-06-06 23:34:10 -0400 | [diff] [blame] | 76 | |
| 77 | int qemu_daemon(int nochdir, int noclose) |
| 78 | { |
| 79 | return daemon(nochdir, noclose); |
| 80 | } |
| 81 | |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 82 | void *qemu_oom_check(void *ptr) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 83 | { |
| 84 | if (ptr == NULL) { |
| 85 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); |
| 86 | abort(); |
| 87 | } |
| 88 | return ptr; |
| 89 | } |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 90 | |
| 91 | void *qemu_memalign(size_t alignment, size_t size) |
| 92 | { |
| 93 | void *ptr; |
| 94 | #if defined(_POSIX_C_SOURCE) && !defined(__sun__) |
| 95 | int ret; |
| 96 | ret = posix_memalign(&ptr, alignment, size); |
| 97 | if (ret != 0) { |
| 98 | fprintf(stderr, "Failed to allocate %zu B: %s\n", |
| 99 | size, strerror(ret)); |
| 100 | abort(); |
| 101 | } |
| 102 | #elif defined(CONFIG_BSD) |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 103 | ptr = qemu_oom_check(valloc(size)); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 104 | #else |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 105 | ptr = qemu_oom_check(memalign(alignment, size)); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 106 | #endif |
| 107 | trace_qemu_memalign(alignment, size, ptr); |
| 108 | return ptr; |
| 109 | } |
| 110 | |
Blue Swirl | 71ea2e0 | 2012-06-24 20:15:05 +0000 | [diff] [blame] | 111 | /* conflicts with qemu_vmalloc in bsd-user/mmap.c */ |
| 112 | #if !defined(CONFIG_BSD_USER) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 113 | /* alloc shared memory pages */ |
| 114 | void *qemu_vmalloc(size_t size) |
| 115 | { |
Jes Sorensen | c7f4111 | 2011-07-25 17:13:36 +0200 | [diff] [blame] | 116 | void *ptr; |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 117 | size_t align = QEMU_VMALLOC_ALIGN; |
| 118 | |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 119 | #if defined(CONFIG_VALGRIND) |
| 120 | if (running_on_valgrind < 0) { |
| 121 | /* First call, test whether we are running on Valgrind. |
| 122 | This is a substitute for RUNNING_ON_VALGRIND from valgrind.h. */ |
| 123 | const char *ld = getenv("LD_PRELOAD"); |
| 124 | running_on_valgrind = (ld != NULL && strstr(ld, "vgpreload")); |
| 125 | } |
| 126 | #endif |
| 127 | |
| 128 | if (size < align || running_on_valgrind) { |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 129 | align = getpagesize(); |
| 130 | } |
| 131 | ptr = qemu_memalign(align, size); |
Jes Sorensen | c7f4111 | 2011-07-25 17:13:36 +0200 | [diff] [blame] | 132 | trace_qemu_vmalloc(size, ptr); |
| 133 | return ptr; |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 134 | } |
Blue Swirl | 71ea2e0 | 2012-06-24 20:15:05 +0000 | [diff] [blame] | 135 | #endif |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 136 | |
| 137 | void qemu_vfree(void *ptr) |
| 138 | { |
| 139 | trace_qemu_vfree(ptr); |
| 140 | free(ptr); |
| 141 | } |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 142 | |
Paolo Bonzini | 154b9a0 | 2011-10-05 09:17:32 +0200 | [diff] [blame] | 143 | void socket_set_block(int fd) |
| 144 | { |
| 145 | int f; |
| 146 | f = fcntl(fd, F_GETFL); |
| 147 | fcntl(fd, F_SETFL, f & ~O_NONBLOCK); |
| 148 | } |
| 149 | |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 150 | void socket_set_nonblock(int fd) |
| 151 | { |
| 152 | int f; |
| 153 | f = fcntl(fd, F_GETFL); |
| 154 | fcntl(fd, F_SETFL, f | O_NONBLOCK); |
| 155 | } |
| 156 | |
| 157 | void qemu_set_cloexec(int fd) |
| 158 | { |
| 159 | int f; |
| 160 | f = fcntl(fd, F_GETFD); |
| 161 | fcntl(fd, F_SETFD, f | FD_CLOEXEC); |
| 162 | } |
Jes Sorensen | 70e72ce | 2010-10-26 10:39:21 +0200 | [diff] [blame] | 163 | |
| 164 | /* |
| 165 | * Creates a pipe with FD_CLOEXEC set on both file descriptors |
| 166 | */ |
| 167 | int qemu_pipe(int pipefd[2]) |
| 168 | { |
| 169 | int ret; |
| 170 | |
| 171 | #ifdef CONFIG_PIPE2 |
| 172 | ret = pipe2(pipefd, O_CLOEXEC); |
| 173 | if (ret != -1 || errno != ENOSYS) { |
| 174 | return ret; |
| 175 | } |
| 176 | #endif |
| 177 | ret = pipe(pipefd); |
| 178 | if (ret == 0) { |
| 179 | qemu_set_cloexec(pipefd[0]); |
| 180 | qemu_set_cloexec(pipefd[1]); |
| 181 | } |
| 182 | |
| 183 | return ret; |
| 184 | } |
Hidetoshi Seto | 3867142 | 2010-11-24 11:38:10 +0900 | [diff] [blame] | 185 | |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 186 | /* |
| 187 | * Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set. |
| 188 | */ |
| 189 | int qemu_eventfd(int fds[2]) |
| 190 | { |
| 191 | #ifdef CONFIG_EVENTFD |
| 192 | int ret; |
| 193 | |
| 194 | ret = eventfd(0, 0); |
| 195 | if (ret >= 0) { |
| 196 | fds[0] = ret; |
| 197 | fds[1] = dup(ret); |
| 198 | if (fds[1] == -1) { |
| 199 | close(ret); |
| 200 | return -1; |
| 201 | } |
| 202 | qemu_set_cloexec(ret); |
| 203 | qemu_set_cloexec(fds[1]); |
| 204 | return 0; |
| 205 | } |
| 206 | if (errno != ENOSYS) { |
| 207 | return -1; |
| 208 | } |
| 209 | #endif |
| 210 | |
| 211 | return qemu_pipe(fds); |
| 212 | } |
| 213 | |
Paolo Bonzini | ae0f940 | 2011-11-21 09:29:11 +0100 | [diff] [blame] | 214 | int qemu_utimens(const char *path, const struct timespec *times) |
Hidetoshi Seto | 3867142 | 2010-11-24 11:38:10 +0900 | [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 | |
Paolo Bonzini | ae0f940 | 2011-11-21 09:29:11 +0100 | [diff] [blame] | 222 | ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW); |
Hidetoshi Seto | 3867142 | 2010-11-24 11:38:10 +0900 | [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 | } |