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1 | /* | |
2 | * QEMU low level functions | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include <stdlib.h> | |
25 | #include <stdio.h> | |
26 | #include <stdarg.h> | |
27 | #include <string.h> | |
28 | #include <errno.h> | |
29 | #include <unistd.h> | |
30 | #include <fcntl.h> | |
31 | ||
32 | /* Needed early for CONFIG_BSD etc. */ | |
33 | #include "config-host.h" | |
34 | ||
35 | #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) | |
36 | #include <sys/mman.h> | |
37 | #endif | |
38 | ||
39 | #ifdef CONFIG_SOLARIS | |
40 | #include <sys/types.h> | |
41 | #include <sys/statvfs.h> | |
42 | /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for | |
43 | discussion about Solaris header problems */ | |
44 | extern int madvise(caddr_t, size_t, int); | |
45 | #endif | |
46 | ||
47 | #include "qemu-common.h" | |
48 | #include "trace.h" | |
49 | #include "sysemu.h" | |
50 | #include "qemu_socket.h" | |
51 | ||
52 | int qemu_madvise(void *addr, size_t len, int advice) | |
53 | { | |
54 | if (advice == QEMU_MADV_INVALID) { | |
55 | errno = EINVAL; | |
56 | return -1; | |
57 | } | |
58 | #if defined(CONFIG_MADVISE) | |
59 | return madvise(addr, len, advice); | |
60 | #elif defined(CONFIG_POSIX_MADVISE) | |
61 | return posix_madvise(addr, len, advice); | |
62 | #else | |
63 | errno = EINVAL; | |
64 | return -1; | |
65 | #endif | |
66 | } | |
67 | ||
68 | ||
69 | /* | |
70 | * Opens a file with FD_CLOEXEC set | |
71 | */ | |
72 | int qemu_open(const char *name, int flags, ...) | |
73 | { | |
74 | int ret; | |
75 | int mode = 0; | |
76 | ||
77 | if (flags & O_CREAT) { | |
78 | va_list ap; | |
79 | ||
80 | va_start(ap, flags); | |
81 | mode = va_arg(ap, int); | |
82 | va_end(ap); | |
83 | } | |
84 | ||
85 | #ifdef O_CLOEXEC | |
86 | ret = open(name, flags | O_CLOEXEC, mode); | |
87 | #else | |
88 | ret = open(name, flags, mode); | |
89 | if (ret >= 0) { | |
90 | qemu_set_cloexec(ret); | |
91 | } | |
92 | #endif | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | /* | |
98 | * A variant of write(2) which handles partial write. | |
99 | * | |
100 | * Return the number of bytes transferred. | |
101 | * Set errno if fewer than `count' bytes are written. | |
102 | * | |
103 | * This function don't work with non-blocking fd's. | |
104 | * Any of the possibilities with non-bloking fd's is bad: | |
105 | * - return a short write (then name is wrong) | |
106 | * - busy wait adding (errno == EAGAIN) to the loop | |
107 | */ | |
108 | ssize_t qemu_write_full(int fd, const void *buf, size_t count) | |
109 | { | |
110 | ssize_t ret = 0; | |
111 | ssize_t total = 0; | |
112 | ||
113 | while (count) { | |
114 | ret = write(fd, buf, count); | |
115 | if (ret < 0) { | |
116 | if (errno == EINTR) | |
117 | continue; | |
118 | break; | |
119 | } | |
120 | ||
121 | count -= ret; | |
122 | buf += ret; | |
123 | total += ret; | |
124 | } | |
125 | ||
126 | return total; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Opens a socket with FD_CLOEXEC set | |
131 | */ | |
132 | int qemu_socket(int domain, int type, int protocol) | |
133 | { | |
134 | int ret; | |
135 | ||
136 | #ifdef SOCK_CLOEXEC | |
137 | ret = socket(domain, type | SOCK_CLOEXEC, protocol); | |
138 | if (ret != -1 || errno != EINVAL) { | |
139 | return ret; | |
140 | } | |
141 | #endif | |
142 | ret = socket(domain, type, protocol); | |
143 | if (ret >= 0) { | |
144 | qemu_set_cloexec(ret); | |
145 | } | |
146 | ||
147 | return ret; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Accept a connection and set FD_CLOEXEC | |
152 | */ | |
153 | int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) | |
154 | { | |
155 | int ret; | |
156 | ||
157 | #ifdef CONFIG_ACCEPT4 | |
158 | ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); | |
159 | if (ret != -1 || errno != ENOSYS) { | |
160 | return ret; | |
161 | } | |
162 | #endif | |
163 | ret = accept(s, addr, addrlen); | |
164 | if (ret >= 0) { | |
165 | qemu_set_cloexec(ret); | |
166 | } | |
167 | ||
168 | return ret; | |
169 | } |