Makefile.hw: allow hw/ files to include glib headers
[qemu.git] / osdep.c
blob56e6963f1572589d1dbfc3bda8915ae6368ffd5a
1 /*
2 * QEMU low level functions
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
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>
32 /* Needed early for CONFIG_BSD etc. */
33 #include "config-host.h"
35 #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE)
36 #include <sys/mman.h>
37 #endif
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
47 #include "qemu-common.h"
48 #include "trace.h"
49 #include "qemu_socket.h"
51 int qemu_madvise(void *addr, size_t len, int advice)
53 if (advice == QEMU_MADV_INVALID) {
54 errno = EINVAL;
55 return -1;
57 #if defined(CONFIG_MADVISE)
58 return madvise(addr, len, advice);
59 #elif defined(CONFIG_POSIX_MADVISE)
60 return posix_madvise(addr, len, advice);
61 #else
62 errno = EINVAL;
63 return -1;
64 #endif
69 * Opens a file with FD_CLOEXEC set
71 int qemu_open(const char *name, int flags, ...)
73 int ret;
74 int mode = 0;
76 if (flags & O_CREAT) {
77 va_list ap;
79 va_start(ap, flags);
80 mode = va_arg(ap, int);
81 va_end(ap);
84 #ifdef O_CLOEXEC
85 ret = open(name, flags | O_CLOEXEC, mode);
86 #else
87 ret = open(name, flags, mode);
88 if (ret >= 0) {
89 qemu_set_cloexec(ret);
91 #endif
93 return ret;
97 * A variant of write(2) which handles partial write.
99 * Return the number of bytes transferred.
100 * Set errno if fewer than `count' bytes are written.
102 * This function don't work with non-blocking fd's.
103 * Any of the possibilities with non-bloking fd's is bad:
104 * - return a short write (then name is wrong)
105 * - busy wait adding (errno == EAGAIN) to the loop
107 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
109 ssize_t ret = 0;
110 ssize_t total = 0;
112 while (count) {
113 ret = write(fd, buf, count);
114 if (ret < 0) {
115 if (errno == EINTR)
116 continue;
117 break;
120 count -= ret;
121 buf += ret;
122 total += ret;
125 return total;
129 * Opens a socket with FD_CLOEXEC set
131 int qemu_socket(int domain, int type, int protocol)
133 int ret;
135 #ifdef SOCK_CLOEXEC
136 ret = socket(domain, type | SOCK_CLOEXEC, protocol);
137 if (ret != -1 || errno != EINVAL) {
138 return ret;
140 #endif
141 ret = socket(domain, type, protocol);
142 if (ret >= 0) {
143 qemu_set_cloexec(ret);
146 return ret;
150 * Accept a connection and set FD_CLOEXEC
152 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
154 int ret;
156 #ifdef CONFIG_ACCEPT4
157 ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
158 if (ret != -1 || errno != ENOSYS) {
159 return ret;
161 #endif
162 ret = accept(s, addr, addrlen);
163 if (ret >= 0) {
164 qemu_set_cloexec(ret);
167 return ret;