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1 | c1b0b93b | Jes Sorensen | /*
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2 | c1b0b93b | Jes Sorensen | * os-posix-lib.c
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3 | c1b0b93b | Jes Sorensen | *
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4 | c1b0b93b | Jes Sorensen | * Copyright (c) 2003-2008 Fabrice Bellard
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5 | c1b0b93b | Jes Sorensen | * Copyright (c) 2010 Red Hat, Inc.
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6 | c1b0b93b | Jes Sorensen | *
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7 | c1b0b93b | Jes Sorensen | * QEMU library functions on POSIX which are shared between QEMU and
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8 | c1b0b93b | Jes Sorensen | * the QEMU tools.
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9 | c1b0b93b | Jes Sorensen | *
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10 | c1b0b93b | Jes Sorensen | * Permission is hereby granted, free of charge, to any person obtaining a copy
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11 | c1b0b93b | Jes Sorensen | * of this software and associated documentation files (the "Software"), to deal
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12 | c1b0b93b | Jes Sorensen | * in the Software without restriction, including without limitation the rights
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13 | c1b0b93b | Jes Sorensen | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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14 | c1b0b93b | Jes Sorensen | * copies of the Software, and to permit persons to whom the Software is
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15 | c1b0b93b | Jes Sorensen | * furnished to do so, subject to the following conditions:
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16 | c1b0b93b | Jes Sorensen | *
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17 | c1b0b93b | Jes Sorensen | * The above copyright notice and this permission notice shall be included in
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18 | c1b0b93b | Jes Sorensen | * all copies or substantial portions of the Software.
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19 | c1b0b93b | Jes Sorensen | *
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20 | c1b0b93b | Jes Sorensen | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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21 | c1b0b93b | Jes Sorensen | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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22 | c1b0b93b | Jes Sorensen | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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23 | c1b0b93b | Jes Sorensen | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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24 | c1b0b93b | Jes Sorensen | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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25 | c1b0b93b | Jes Sorensen | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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26 | c1b0b93b | Jes Sorensen | * THE SOFTWARE.
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27 | c1b0b93b | Jes Sorensen | */
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28 | c1b0b93b | Jes Sorensen | |
29 | f97742d0 | Alexandre Raymond | /* The following block of code temporarily renames the daemon() function so the
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30 | f97742d0 | Alexandre Raymond | compiler does not see the warning associated with it in stdlib.h on OSX */
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31 | f97742d0 | Alexandre Raymond | #ifdef __APPLE__
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32 | f97742d0 | Alexandre Raymond | #define daemon qemu_fake_daemon_function
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33 | f97742d0 | Alexandre Raymond | #include <stdlib.h> |
34 | f97742d0 | Alexandre Raymond | #undef daemon
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35 | f97742d0 | Alexandre Raymond | extern int daemon(int, int); |
36 | f97742d0 | Alexandre Raymond | #endif
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37 | f97742d0 | Alexandre Raymond | |
38 | c1b0b93b | Jes Sorensen | #include "config-host.h" |
39 | c1b0b93b | Jes Sorensen | #include "sysemu.h" |
40 | c1b0b93b | Jes Sorensen | #include "trace.h" |
41 | 9549e764 | Jes Sorensen | #include "qemu_socket.h" |
42 | c1b0b93b | Jes Sorensen | |
43 | f97742d0 | Alexandre Raymond | |
44 | f97742d0 | Alexandre Raymond | |
45 | f97742d0 | Alexandre Raymond | int qemu_daemon(int nochdir, int noclose) |
46 | f97742d0 | Alexandre Raymond | { |
47 | f97742d0 | Alexandre Raymond | return daemon(nochdir, noclose);
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48 | f97742d0 | Alexandre Raymond | } |
49 | f97742d0 | Alexandre Raymond | |
50 | b152aa84 | Jes Sorensen | void *qemu_oom_check(void *ptr) |
51 | c1b0b93b | Jes Sorensen | { |
52 | c1b0b93b | Jes Sorensen | if (ptr == NULL) { |
53 | c1b0b93b | Jes Sorensen | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
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54 | c1b0b93b | Jes Sorensen | abort(); |
55 | c1b0b93b | Jes Sorensen | } |
56 | c1b0b93b | Jes Sorensen | return ptr;
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57 | c1b0b93b | Jes Sorensen | } |
58 | c1b0b93b | Jes Sorensen | |
59 | c1b0b93b | Jes Sorensen | void *qemu_memalign(size_t alignment, size_t size)
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60 | c1b0b93b | Jes Sorensen | { |
61 | c1b0b93b | Jes Sorensen | void *ptr;
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62 | c1b0b93b | Jes Sorensen | #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
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63 | c1b0b93b | Jes Sorensen | int ret;
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64 | c1b0b93b | Jes Sorensen | ret = posix_memalign(&ptr, alignment, size); |
65 | c1b0b93b | Jes Sorensen | if (ret != 0) { |
66 | c1b0b93b | Jes Sorensen | fprintf(stderr, "Failed to allocate %zu B: %s\n",
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67 | c1b0b93b | Jes Sorensen | size, strerror(ret)); |
68 | c1b0b93b | Jes Sorensen | abort(); |
69 | c1b0b93b | Jes Sorensen | } |
70 | c1b0b93b | Jes Sorensen | #elif defined(CONFIG_BSD)
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71 | b152aa84 | Jes Sorensen | ptr = qemu_oom_check(valloc(size)); |
72 | c1b0b93b | Jes Sorensen | #else
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73 | b152aa84 | Jes Sorensen | ptr = qemu_oom_check(memalign(alignment, size)); |
74 | c1b0b93b | Jes Sorensen | #endif
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75 | c1b0b93b | Jes Sorensen | trace_qemu_memalign(alignment, size, ptr); |
76 | c1b0b93b | Jes Sorensen | return ptr;
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77 | c1b0b93b | Jes Sorensen | } |
78 | c1b0b93b | Jes Sorensen | |
79 | c1b0b93b | Jes Sorensen | /* alloc shared memory pages */
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80 | c1b0b93b | Jes Sorensen | void *qemu_vmalloc(size_t size)
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81 | c1b0b93b | Jes Sorensen | { |
82 | c7f4111a | Jes Sorensen | void *ptr;
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83 | c7f4111a | Jes Sorensen | ptr = qemu_memalign(getpagesize(), size); |
84 | c7f4111a | Jes Sorensen | trace_qemu_vmalloc(size, ptr); |
85 | c7f4111a | Jes Sorensen | return ptr;
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86 | c1b0b93b | Jes Sorensen | } |
87 | c1b0b93b | Jes Sorensen | |
88 | c1b0b93b | Jes Sorensen | void qemu_vfree(void *ptr) |
89 | c1b0b93b | Jes Sorensen | { |
90 | c1b0b93b | Jes Sorensen | trace_qemu_vfree(ptr); |
91 | c1b0b93b | Jes Sorensen | free(ptr); |
92 | c1b0b93b | Jes Sorensen | } |
93 | 9549e764 | Jes Sorensen | |
94 | 9549e764 | Jes Sorensen | void socket_set_nonblock(int fd) |
95 | 9549e764 | Jes Sorensen | { |
96 | 9549e764 | Jes Sorensen | int f;
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97 | 9549e764 | Jes Sorensen | f = fcntl(fd, F_GETFL); |
98 | 9549e764 | Jes Sorensen | fcntl(fd, F_SETFL, f | O_NONBLOCK); |
99 | 9549e764 | Jes Sorensen | } |
100 | 9549e764 | Jes Sorensen | |
101 | 9549e764 | Jes Sorensen | void qemu_set_cloexec(int fd) |
102 | 9549e764 | Jes Sorensen | { |
103 | 9549e764 | Jes Sorensen | int f;
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104 | 9549e764 | Jes Sorensen | f = fcntl(fd, F_GETFD); |
105 | 9549e764 | Jes Sorensen | fcntl(fd, F_SETFD, f | FD_CLOEXEC); |
106 | 9549e764 | Jes Sorensen | } |
107 | 70e72ce4 | Jes Sorensen | |
108 | 70e72ce4 | Jes Sorensen | /*
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109 | 70e72ce4 | Jes Sorensen | * Creates a pipe with FD_CLOEXEC set on both file descriptors
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110 | 70e72ce4 | Jes Sorensen | */
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111 | 70e72ce4 | Jes Sorensen | int qemu_pipe(int pipefd[2]) |
112 | 70e72ce4 | Jes Sorensen | { |
113 | 70e72ce4 | Jes Sorensen | int ret;
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114 | 70e72ce4 | Jes Sorensen | |
115 | 70e72ce4 | Jes Sorensen | #ifdef CONFIG_PIPE2
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116 | 70e72ce4 | Jes Sorensen | ret = pipe2(pipefd, O_CLOEXEC); |
117 | 70e72ce4 | Jes Sorensen | if (ret != -1 || errno != ENOSYS) { |
118 | 70e72ce4 | Jes Sorensen | return ret;
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119 | 70e72ce4 | Jes Sorensen | } |
120 | 70e72ce4 | Jes Sorensen | #endif
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121 | 70e72ce4 | Jes Sorensen | ret = pipe(pipefd); |
122 | 70e72ce4 | Jes Sorensen | if (ret == 0) { |
123 | 70e72ce4 | Jes Sorensen | qemu_set_cloexec(pipefd[0]);
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124 | 70e72ce4 | Jes Sorensen | qemu_set_cloexec(pipefd[1]);
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125 | 70e72ce4 | Jes Sorensen | } |
126 | 70e72ce4 | Jes Sorensen | |
127 | 70e72ce4 | Jes Sorensen | return ret;
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128 | 70e72ce4 | Jes Sorensen | } |
129 | 38671423 | Hidetoshi Seto | |
130 | 38671423 | Hidetoshi Seto | int qemu_utimensat(int dirfd, const char *path, const struct timespec *times, |
131 | 38671423 | Hidetoshi Seto | int flags)
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132 | 38671423 | Hidetoshi Seto | { |
133 | 38671423 | Hidetoshi Seto | struct timeval tv[2], tv_now; |
134 | 38671423 | Hidetoshi Seto | struct stat st;
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135 | 38671423 | Hidetoshi Seto | int i;
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136 | 38671423 | Hidetoshi Seto | #ifdef CONFIG_UTIMENSAT
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137 | 38671423 | Hidetoshi Seto | int ret;
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138 | 38671423 | Hidetoshi Seto | |
139 | 38671423 | Hidetoshi Seto | ret = utimensat(dirfd, path, times, flags); |
140 | 38671423 | Hidetoshi Seto | if (ret != -1 || errno != ENOSYS) { |
141 | 38671423 | Hidetoshi Seto | return ret;
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142 | 38671423 | Hidetoshi Seto | } |
143 | 38671423 | Hidetoshi Seto | #endif
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144 | 38671423 | Hidetoshi Seto | /* Fallback: use utimes() instead of utimensat() */
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145 | 38671423 | Hidetoshi Seto | |
146 | 38671423 | Hidetoshi Seto | /* happy if special cases */
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147 | 38671423 | Hidetoshi Seto | if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) { |
148 | 38671423 | Hidetoshi Seto | return 0; |
149 | 38671423 | Hidetoshi Seto | } |
150 | 38671423 | Hidetoshi Seto | if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) { |
151 | 38671423 | Hidetoshi Seto | return utimes(path, NULL); |
152 | 38671423 | Hidetoshi Seto | } |
153 | 38671423 | Hidetoshi Seto | |
154 | 38671423 | Hidetoshi Seto | /* prepare for hard cases */
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155 | 38671423 | Hidetoshi Seto | if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) { |
156 | 38671423 | Hidetoshi Seto | gettimeofday(&tv_now, NULL);
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157 | 38671423 | Hidetoshi Seto | } |
158 | 38671423 | Hidetoshi Seto | if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) { |
159 | 38671423 | Hidetoshi Seto | stat(path, &st); |
160 | 38671423 | Hidetoshi Seto | } |
161 | 38671423 | Hidetoshi Seto | |
162 | 38671423 | Hidetoshi Seto | for (i = 0; i < 2; i++) { |
163 | 38671423 | Hidetoshi Seto | if (times[i].tv_nsec == UTIME_NOW) {
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164 | 38671423 | Hidetoshi Seto | tv[i].tv_sec = tv_now.tv_sec; |
165 | 38671423 | Hidetoshi Seto | tv[i].tv_usec = tv_now.tv_usec; |
166 | 38671423 | Hidetoshi Seto | } else if (times[i].tv_nsec == UTIME_OMIT) { |
167 | 38671423 | Hidetoshi Seto | tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
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168 | 38671423 | Hidetoshi Seto | tv[i].tv_usec = 0;
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169 | 38671423 | Hidetoshi Seto | } else {
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170 | 38671423 | Hidetoshi Seto | tv[i].tv_sec = times[i].tv_sec; |
171 | 38671423 | Hidetoshi Seto | tv[i].tv_usec = times[i].tv_nsec / 1000;
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172 | 38671423 | Hidetoshi Seto | } |
173 | 38671423 | Hidetoshi Seto | } |
174 | 38671423 | Hidetoshi Seto | |
175 | 38671423 | Hidetoshi Seto | return utimes(path, &tv[0]); |
176 | 38671423 | Hidetoshi Seto | } |