PPC: e500mc: add missing IVORs to bitmap
[qemu.git] / oslib-posix.c
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
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__)
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 # define CONFIG_VALGRIND
44 #else
45 # define QEMU_VMALLOC_ALIGN getpagesize()
46 #endif
47
48 #include "config-host.h"
49 #include "sysemu.h"
50 #include "trace.h"
51 #include "qemu_socket.h"
52
53 #if defined(CONFIG_VALGRIND)
54 static int running_on_valgrind = -1;
55 #else
56 # define running_on_valgrind 0
57 #endif
58 #ifdef CONFIG_LINUX
59 #include <sys/syscall.h>
60 #endif
61 #ifdef CONFIG_EVENTFD
62 #include <sys/eventfd.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 }
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 void *ptr;
112 size_t align = QEMU_VMALLOC_ALIGN;
113
114 #if defined(CONFIG_VALGRIND)
115 if (running_on_valgrind < 0) {
116 /* First call, test whether we are running on Valgrind.
117 This is a substitute for RUNNING_ON_VALGRIND from valgrind.h. */
118 const char *ld = getenv("LD_PRELOAD");
119 running_on_valgrind = (ld != NULL && strstr(ld, "vgpreload"));
120 }
121 #endif
122
123 if (size < align || running_on_valgrind) {
124 align = getpagesize();
125 }
126 ptr = qemu_memalign(align, size);
127 trace_qemu_vmalloc(size, ptr);
128 return ptr;
129 }
130
131 void qemu_vfree(void *ptr)
132 {
133 trace_qemu_vfree(ptr);
134 free(ptr);
135 }
136
137 void socket_set_block(int fd)
138 {
139 int f;
140 f = fcntl(fd, F_GETFL);
141 fcntl(fd, F_SETFL, f & ~O_NONBLOCK);
142 }
143
144 void socket_set_nonblock(int fd)
145 {
146 int f;
147 f = fcntl(fd, F_GETFL);
148 fcntl(fd, F_SETFL, f | O_NONBLOCK);
149 }
150
151 void qemu_set_cloexec(int fd)
152 {
153 int f;
154 f = fcntl(fd, F_GETFD);
155 fcntl(fd, F_SETFD, f | FD_CLOEXEC);
156 }
157
158 /*
159 * Creates a pipe with FD_CLOEXEC set on both file descriptors
160 */
161 int qemu_pipe(int pipefd[2])
162 {
163 int ret;
164
165 #ifdef CONFIG_PIPE2
166 ret = pipe2(pipefd, O_CLOEXEC);
167 if (ret != -1 || errno != ENOSYS) {
168 return ret;
169 }
170 #endif
171 ret = pipe(pipefd);
172 if (ret == 0) {
173 qemu_set_cloexec(pipefd[0]);
174 qemu_set_cloexec(pipefd[1]);
175 }
176
177 return ret;
178 }
179
180 /*
181 * Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set.
182 */
183 int qemu_eventfd(int fds[2])
184 {
185 #ifdef CONFIG_EVENTFD
186 int ret;
187
188 ret = eventfd(0, 0);
189 if (ret >= 0) {
190 fds[0] = ret;
191 fds[1] = dup(ret);
192 if (fds[1] == -1) {
193 close(ret);
194 return -1;
195 }
196 qemu_set_cloexec(ret);
197 qemu_set_cloexec(fds[1]);
198 return 0;
199 }
200 if (errno != ENOSYS) {
201 return -1;
202 }
203 #endif
204
205 return qemu_pipe(fds);
206 }
207
208 int qemu_utimens(const char *path, const struct timespec *times)
209 {
210 struct timeval tv[2], tv_now;
211 struct stat st;
212 int i;
213 #ifdef CONFIG_UTIMENSAT
214 int ret;
215
216 ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW);
217 if (ret != -1 || errno != ENOSYS) {
218 return ret;
219 }
220 #endif
221 /* Fallback: use utimes() instead of utimensat() */
222
223 /* happy if special cases */
224 if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
225 return 0;
226 }
227 if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
228 return utimes(path, NULL);
229 }
230
231 /* prepare for hard cases */
232 if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
233 gettimeofday(&tv_now, NULL);
234 }
235 if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
236 stat(path, &st);
237 }
238
239 for (i = 0; i < 2; i++) {
240 if (times[i].tv_nsec == UTIME_NOW) {
241 tv[i].tv_sec = tv_now.tv_sec;
242 tv[i].tv_usec = tv_now.tv_usec;
243 } else if (times[i].tv_nsec == UTIME_OMIT) {
244 tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
245 tv[i].tv_usec = 0;
246 } else {
247 tv[i].tv_sec = times[i].tv_sec;
248 tv[i].tv_usec = times[i].tv_nsec / 1000;
249 }
250 }
251
252 return utimes(path, &tv[0]);
253 }