blob: a304fb0f53677b83aa3745a11ba5ac14b00c7af2 [file] [log] [blame]
Jes Sorensenc1b0b932010-10-26 10:39:19 +02001/*
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 Raymondf97742d2011-06-06 23:34:10 -040029/* 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
35extern int daemon(int, int);
36#endif
37
Avi Kivity36b58622011-09-05 11:07:05 +030038#if defined(__linux__) && defined(__x86_64__)
39 /* Use 2MB alignment so transparent hugepages can be used by KVM */
40# define QEMU_VMALLOC_ALIGN (512 * 4096)
41#else
42# define QEMU_VMALLOC_ALIGN getpagesize()
43#endif
44
Jes Sorensenc1b0b932010-10-26 10:39:19 +020045#include "config-host.h"
46#include "sysemu.h"
47#include "trace.h"
Jes Sorensen9549e762010-10-26 10:39:20 +020048#include "qemu_socket.h"
Jes Sorensenc1b0b932010-10-26 10:39:19 +020049
Alexandre Raymondf97742d2011-06-06 23:34:10 -040050
51
52int qemu_daemon(int nochdir, int noclose)
53{
54 return daemon(nochdir, noclose);
55}
56
Jes Sorensenb152aa82010-10-26 10:39:26 +020057void *qemu_oom_check(void *ptr)
Jes Sorensenc1b0b932010-10-26 10:39:19 +020058{
59 if (ptr == NULL) {
60 fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
61 abort();
62 }
63 return ptr;
64}
Jes Sorensenc1b0b932010-10-26 10:39:19 +020065
66void *qemu_memalign(size_t alignment, size_t size)
67{
68 void *ptr;
69#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
70 int ret;
71 ret = posix_memalign(&ptr, alignment, size);
72 if (ret != 0) {
73 fprintf(stderr, "Failed to allocate %zu B: %s\n",
74 size, strerror(ret));
75 abort();
76 }
77#elif defined(CONFIG_BSD)
Jes Sorensenb152aa82010-10-26 10:39:26 +020078 ptr = qemu_oom_check(valloc(size));
Jes Sorensenc1b0b932010-10-26 10:39:19 +020079#else
Jes Sorensenb152aa82010-10-26 10:39:26 +020080 ptr = qemu_oom_check(memalign(alignment, size));
Jes Sorensenc1b0b932010-10-26 10:39:19 +020081#endif
82 trace_qemu_memalign(alignment, size, ptr);
83 return ptr;
84}
85
86/* alloc shared memory pages */
87void *qemu_vmalloc(size_t size)
88{
Jes Sorensenc7f41112011-07-25 17:13:36 +020089 void *ptr;
Avi Kivity36b58622011-09-05 11:07:05 +030090 size_t align = QEMU_VMALLOC_ALIGN;
91
92 if (size < align) {
93 align = getpagesize();
94 }
95 ptr = qemu_memalign(align, size);
Jes Sorensenc7f41112011-07-25 17:13:36 +020096 trace_qemu_vmalloc(size, ptr);
97 return ptr;
Jes Sorensenc1b0b932010-10-26 10:39:19 +020098}
99
100void qemu_vfree(void *ptr)
101{
102 trace_qemu_vfree(ptr);
103 free(ptr);
104}
Jes Sorensen9549e762010-10-26 10:39:20 +0200105
106void socket_set_nonblock(int fd)
107{
108 int f;
109 f = fcntl(fd, F_GETFL);
110 fcntl(fd, F_SETFL, f | O_NONBLOCK);
111}
112
113void qemu_set_cloexec(int fd)
114{
115 int f;
116 f = fcntl(fd, F_GETFD);
117 fcntl(fd, F_SETFD, f | FD_CLOEXEC);
118}
Jes Sorensen70e72ce2010-10-26 10:39:21 +0200119
120/*
121 * Creates a pipe with FD_CLOEXEC set on both file descriptors
122 */
123int qemu_pipe(int pipefd[2])
124{
125 int ret;
126
127#ifdef CONFIG_PIPE2
128 ret = pipe2(pipefd, O_CLOEXEC);
129 if (ret != -1 || errno != ENOSYS) {
130 return ret;
131 }
132#endif
133 ret = pipe(pipefd);
134 if (ret == 0) {
135 qemu_set_cloexec(pipefd[0]);
136 qemu_set_cloexec(pipefd[1]);
137 }
138
139 return ret;
140}
Hidetoshi Seto38671422010-11-24 11:38:10 +0900141
142int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
143 int flags)
144{
145 struct timeval tv[2], tv_now;
146 struct stat st;
147 int i;
148#ifdef CONFIG_UTIMENSAT
149 int ret;
150
151 ret = utimensat(dirfd, path, times, flags);
152 if (ret != -1 || errno != ENOSYS) {
153 return ret;
154 }
155#endif
156 /* Fallback: use utimes() instead of utimensat() */
157
158 /* happy if special cases */
159 if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
160 return 0;
161 }
162 if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
163 return utimes(path, NULL);
164 }
165
166 /* prepare for hard cases */
167 if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
168 gettimeofday(&tv_now, NULL);
169 }
170 if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
171 stat(path, &st);
172 }
173
174 for (i = 0; i < 2; i++) {
175 if (times[i].tv_nsec == UTIME_NOW) {
176 tv[i].tv_sec = tv_now.tv_sec;
177 tv[i].tv_usec = tv_now.tv_usec;
178 } else if (times[i].tv_nsec == UTIME_OMIT) {
179 tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
180 tv[i].tv_usec = 0;
181 } else {
182 tv[i].tv_sec = times[i].tv_sec;
183 tv[i].tv_usec = times[i].tv_nsec / 1000;
184 }
185 }
186
187 return utimes(path, &tv[0]);
188}