qemu-log: Rename the public-facing cpu_set_log function to qemu_set_log
[qemu/pbrook.git] / util / oslib-posix.c
blobb4152fb33cdf438df5f8edde93de0bd99be51947
1 /*
2 * os-posix-lib.c
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2010 Red Hat, Inc.
7 * QEMU library functions on POSIX which are shared between QEMU and
8 * the QEMU tools.
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:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
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.
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
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 #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)
47 #else
48 # define QEMU_VMALLOC_ALIGN getpagesize()
49 #endif
51 #include "config-host.h"
52 #include "sysemu/sysemu.h"
53 #include "trace.h"
54 #include "qemu/sockets.h"
56 #if defined(CONFIG_VALGRIND)
57 static int running_on_valgrind = -1;
58 #else
59 # define running_on_valgrind 0
60 #endif
61 #ifdef CONFIG_LINUX
62 #include <sys/syscall.h>
63 #endif
65 int qemu_get_thread_id(void)
67 #if defined(__linux__)
68 return syscall(SYS_gettid);
69 #else
70 return getpid();
71 #endif
74 int qemu_daemon(int nochdir, int noclose)
76 return daemon(nochdir, noclose);
79 void *qemu_oom_check(void *ptr)
81 if (ptr == NULL) {
82 fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
83 abort();
85 return ptr;
88 void *qemu_memalign(size_t alignment, size_t size)
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();
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;
108 /* alloc shared memory pages */
109 void *qemu_vmalloc(size_t size)
111 void *ptr;
112 size_t align = QEMU_VMALLOC_ALIGN;
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"));
121 #endif
123 if (size < align || running_on_valgrind) {
124 align = getpagesize();
126 ptr = qemu_memalign(align, size);
127 trace_qemu_vmalloc(size, ptr);
128 return ptr;
131 void qemu_vfree(void *ptr)
133 trace_qemu_vfree(ptr);
134 free(ptr);
137 void socket_set_block(int fd)
139 int f;
140 f = fcntl(fd, F_GETFL);
141 fcntl(fd, F_SETFL, f & ~O_NONBLOCK);
144 void socket_set_nonblock(int fd)
146 int f;
147 f = fcntl(fd, F_GETFL);
148 fcntl(fd, F_SETFL, f | O_NONBLOCK);
151 void qemu_set_cloexec(int fd)
153 int f;
154 f = fcntl(fd, F_GETFD);
155 fcntl(fd, F_SETFD, f | FD_CLOEXEC);
159 * Creates a pipe with FD_CLOEXEC set on both file descriptors
161 int qemu_pipe(int pipefd[2])
163 int ret;
165 #ifdef CONFIG_PIPE2
166 ret = pipe2(pipefd, O_CLOEXEC);
167 if (ret != -1 || errno != ENOSYS) {
168 return ret;
170 #endif
171 ret = pipe(pipefd);
172 if (ret == 0) {
173 qemu_set_cloexec(pipefd[0]);
174 qemu_set_cloexec(pipefd[1]);
177 return ret;
180 int qemu_utimens(const char *path, const struct timespec *times)
182 struct timeval tv[2], tv_now;
183 struct stat st;
184 int i;
185 #ifdef CONFIG_UTIMENSAT
186 int ret;
188 ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW);
189 if (ret != -1 || errno != ENOSYS) {
190 return ret;
192 #endif
193 /* Fallback: use utimes() instead of utimensat() */
195 /* happy if special cases */
196 if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
197 return 0;
199 if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
200 return utimes(path, NULL);
203 /* prepare for hard cases */
204 if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
205 gettimeofday(&tv_now, NULL);
207 if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
208 stat(path, &st);
211 for (i = 0; i < 2; i++) {
212 if (times[i].tv_nsec == UTIME_NOW) {
213 tv[i].tv_sec = tv_now.tv_sec;
214 tv[i].tv_usec = tv_now.tv_usec;
215 } else if (times[i].tv_nsec == UTIME_OMIT) {
216 tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
217 tv[i].tv_usec = 0;
218 } else {
219 tv[i].tv_sec = times[i].tv_sec;
220 tv[i].tv_usec = times[i].tv_nsec / 1000;
224 return utimes(path, &tv[0]);