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 #include "config-host.h"
30 #include "sysemu.h"
31 #include "trace.h"
32 #include "qemu_socket.h"
33
qemu_oom_check(void * ptr)34 void *qemu_oom_check(void *ptr)
35 {
36 if (ptr == NULL) {
37 fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
38 abort();
39 }
40 return ptr;
41 }
42
qemu_memalign(size_t alignment,size_t size)43 void *qemu_memalign(size_t alignment, size_t size)
44 {
45 void *ptr;
46 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
47 int ret;
48 ret = posix_memalign(&ptr, alignment, size);
49 if (ret != 0) {
50 fprintf(stderr, "Failed to allocate %zu B: %s\n",
51 size, strerror(ret));
52 abort();
53 }
54 #elif defined(CONFIG_BSD)
55 ptr = qemu_oom_check(valloc(size));
56 #else
57 ptr = qemu_oom_check(memalign(alignment, size));
58 #endif
59 //trace_qemu_memalign(alignment, size, ptr);
60 return ptr;
61 }
62
63 /* alloc shared memory pages */
qemu_vmalloc(size_t size)64 void *qemu_vmalloc(size_t size)
65 {
66 return qemu_memalign(getpagesize(), size);
67 }
68
qemu_vfree(void * ptr)69 void qemu_vfree(void *ptr)
70 {
71 //trace_qemu_vfree(ptr);
72 free(ptr);
73 }
74
75 #if 0 /* in sockets.c */
76 void socket_set_nonblock(int fd)
77 {
78 int f;
79 f = fcntl(fd, F_GETFL);
80 fcntl(fd, F_SETFL, f | O_NONBLOCK);
81 }
82 #endif
83
qemu_set_cloexec(int fd)84 void qemu_set_cloexec(int fd)
85 {
86 int f;
87 f = fcntl(fd, F_GETFD);
88 fcntl(fd, F_SETFD, f | FD_CLOEXEC);
89 }
90
91 /*
92 * Creates a pipe with FD_CLOEXEC set on both file descriptors
93 */
qemu_pipe(int pipefd[2])94 int qemu_pipe(int pipefd[2])
95 {
96 int ret;
97
98 #ifdef CONFIG_PIPE2
99 ret = pipe2(pipefd, O_CLOEXEC);
100 if (ret != -1 || errno != ENOSYS) {
101 return ret;
102 }
103 #endif
104 ret = pipe(pipefd);
105 if (ret == 0) {
106 qemu_set_cloexec(pipefd[0]);
107 qemu_set_cloexec(pipefd[1]);
108 }
109
110 return ret;
111 }
112
qemu_utimensat(int dirfd,const char * path,const struct timespec * times,int flags)113 int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
114 int flags)
115 {
116 struct timeval tv[2], tv_now;
117 struct stat st;
118 int i;
119 #ifdef CONFIG_UTIMENSAT
120 int ret;
121
122 ret = utimensat(dirfd, path, times, flags);
123 if (ret != -1 || errno != ENOSYS) {
124 return ret;
125 }
126 #endif
127 /* Fallback: use utimes() instead of utimensat() */
128
129 /* happy if special cases */
130 if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
131 return 0;
132 }
133 if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
134 return utimes(path, NULL);
135 }
136
137 /* prepare for hard cases */
138 if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
139 gettimeofday(&tv_now, NULL);
140 }
141 if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
142 stat(path, &st);
143 }
144
145 for (i = 0; i < 2; i++) {
146 if (times[i].tv_nsec == UTIME_NOW) {
147 tv[i].tv_sec = tv_now.tv_sec;
148 tv[i].tv_usec = tv_now.tv_usec;
149 } else if (times[i].tv_nsec == UTIME_OMIT) {
150 tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
151 tv[i].tv_usec = 0;
152 } else {
153 tv[i].tv_sec = times[i].tv_sec;
154 tv[i].tv_usec = times[i].tv_nsec / 1000;
155 }
156 }
157
158 return utimes(path, &tv[0]);
159 }
160