isa-bus: Remove bogus IRQ sharing check
[qemu.git] / osdep.c
blob327583baf73a8b1b10f3b6456bcd80a7861a49e7
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 "sysemu.h"
50 #include "qemu_socket.h"
52 int qemu_madvise(void *addr, size_t len, int advice)
54 if (advice == QEMU_MADV_INVALID) {
55 errno = EINVAL;
56 return -1;
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
70 * Opens a file with FD_CLOEXEC set
72 int qemu_open(const char *name, int flags, ...)
74 int ret;
75 int mode = 0;
77 if (flags & O_CREAT) {
78 va_list ap;
80 va_start(ap, flags);
81 mode = va_arg(ap, int);
82 va_end(ap);
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);
92 #endif
94 return ret;
98 * A variant of write(2) which handles partial write.
100 * Return the number of bytes transferred.
101 * Set errno if fewer than `count' bytes are written.
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
108 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
110 ssize_t ret = 0;
111 ssize_t total = 0;
113 while (count) {
114 ret = write(fd, buf, count);
115 if (ret < 0) {
116 if (errno == EINTR)
117 continue;
118 break;
121 count -= ret;
122 buf += ret;
123 total += ret;
126 return total;
130 * Opens a socket with FD_CLOEXEC set
132 int qemu_socket(int domain, int type, int protocol)
134 int ret;
136 #ifdef SOCK_CLOEXEC
137 ret = socket(domain, type | SOCK_CLOEXEC, protocol);
138 if (ret != -1 || errno != EINVAL) {
139 return ret;
141 #endif
142 ret = socket(domain, type, protocol);
143 if (ret >= 0) {
144 qemu_set_cloexec(ret);
147 return ret;
151 * Accept a connection and set FD_CLOEXEC
153 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
155 int ret;
157 #ifdef CONFIG_ACCEPT4
158 ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
159 if (ret != -1 || errno != ENOSYS) {
160 return ret;
162 #endif
163 ret = accept(s, addr, addrlen);
164 if (ret >= 0) {
165 qemu_set_cloexec(ret);
168 return ret;