Merge remote-tracking branch 'qmp/queue/qmp' into staging
[qemu.git] / oslib-posix.c
blob196099cc77fdcfd33f380df28bcf4cb2a66b2bd4
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 #include "config-host.h"
39 #include "sysemu.h"
40 #include "trace.h"
41 #include "qemu_socket.h"
45 int qemu_daemon(int nochdir, int noclose)
47 return daemon(nochdir, noclose);
50 void *qemu_oom_check(void *ptr)
52 if (ptr == NULL) {
53 fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
54 abort();
56 return ptr;
59 void *qemu_memalign(size_t alignment, size_t size)
61 void *ptr;
62 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
63 int ret;
64 ret = posix_memalign(&ptr, alignment, size);
65 if (ret != 0) {
66 fprintf(stderr, "Failed to allocate %zu B: %s\n",
67 size, strerror(ret));
68 abort();
70 #elif defined(CONFIG_BSD)
71 ptr = qemu_oom_check(valloc(size));
72 #else
73 ptr = qemu_oom_check(memalign(alignment, size));
74 #endif
75 trace_qemu_memalign(alignment, size, ptr);
76 return ptr;
79 /* alloc shared memory pages */
80 void *qemu_vmalloc(size_t size)
82 void *ptr;
83 ptr = qemu_memalign(getpagesize(), size);
84 trace_qemu_vmalloc(size, ptr);
85 return ptr;
88 void qemu_vfree(void *ptr)
90 trace_qemu_vfree(ptr);
91 free(ptr);
94 void socket_set_nonblock(int fd)
96 int f;
97 f = fcntl(fd, F_GETFL);
98 fcntl(fd, F_SETFL, f | O_NONBLOCK);
101 void qemu_set_cloexec(int fd)
103 int f;
104 f = fcntl(fd, F_GETFD);
105 fcntl(fd, F_SETFD, f | FD_CLOEXEC);
109 * Creates a pipe with FD_CLOEXEC set on both file descriptors
111 int qemu_pipe(int pipefd[2])
113 int ret;
115 #ifdef CONFIG_PIPE2
116 ret = pipe2(pipefd, O_CLOEXEC);
117 if (ret != -1 || errno != ENOSYS) {
118 return ret;
120 #endif
121 ret = pipe(pipefd);
122 if (ret == 0) {
123 qemu_set_cloexec(pipefd[0]);
124 qemu_set_cloexec(pipefd[1]);
127 return ret;
130 int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
131 int flags)
133 struct timeval tv[2], tv_now;
134 struct stat st;
135 int i;
136 #ifdef CONFIG_UTIMENSAT
137 int ret;
139 ret = utimensat(dirfd, path, times, flags);
140 if (ret != -1 || errno != ENOSYS) {
141 return ret;
143 #endif
144 /* Fallback: use utimes() instead of utimensat() */
146 /* happy if special cases */
147 if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
148 return 0;
150 if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
151 return utimes(path, NULL);
154 /* prepare for hard cases */
155 if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
156 gettimeofday(&tv_now, NULL);
158 if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
159 stat(path, &st);
162 for (i = 0; i < 2; i++) {
163 if (times[i].tv_nsec == UTIME_NOW) {
164 tv[i].tv_sec = tv_now.tv_sec;
165 tv[i].tv_usec = tv_now.tv_usec;
166 } else if (times[i].tv_nsec == UTIME_OMIT) {
167 tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
168 tv[i].tv_usec = 0;
169 } else {
170 tv[i].tv_sec = times[i].tv_sec;
171 tv[i].tv_usec = times[i].tv_nsec / 1000;
175 return utimes(path, &tv[0]);