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bellardea888122004-02-16 22:12:40 +00001/*
2 * QEMU low level functions
ths5fafdf22007-09-16 21:08:06 +00003 *
bellardea888122004-02-16 22:12:40 +00004 * Copyright (c) 2003 Fabrice Bellard
ths5fafdf22007-09-16 21:08:06 +00005 *
bellardea888122004-02-16 22:12:40 +00006 * 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>
bellardea888122004-02-16 22:12:40 +000028#include <errno.h>
29#include <unistd.h>
thsaa26bb22007-03-25 21:33:06 +000030#include <fcntl.h>
Paolo Bonzinif582af52010-02-02 20:33:11 +010031
32/* Needed early for CONFIG_BSD etc. */
33#include "config-host.h"
34
Andreas Färbere78815a2010-09-25 11:26:05 +000035#if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE)
36#include <sys/mman.h>
37#endif
38
Juan Quinteladfe5fff2009-07-27 16:12:40 +020039#ifdef CONFIG_SOLARIS
ths605686c2007-01-17 23:31:19 +000040#include <sys/types.h>
41#include <sys/statvfs.h>
Andreas Färbere78815a2010-09-25 11:26:05 +000042/* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for
43 discussion about Solaris header problems */
44extern int madvise(caddr_t, size_t, int);
ths605686c2007-01-17 23:31:19 +000045#endif
bellardea888122004-02-16 22:12:40 +000046
blueswir1511d2b12009-03-07 15:32:56 +000047#include "qemu-common.h"
Stefan Hajnoczicd245a12010-05-22 18:09:25 +010048#include "trace.h"
blueswir1511d2b12009-03-07 15:32:56 +000049#include "sysemu.h"
aliguori03ff3ca2008-09-15 15:51:35 +000050#include "qemu_socket.h"
51
Andreas Färbere78815a2010-09-25 11:26:05 +000052int 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
aliguori03ff3ca2008-09-15 15:51:35 +000068
Kevin Wolf40ff6d72009-12-02 12:24:42 +010069/*
70 * Opens a file with FD_CLOEXEC set
71 */
72int 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
Kirill A. Shutemov7b5f6992010-01-20 00:56:08 +010097/*
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.
Juan Quintela1298cb62010-03-04 10:00:39 +0100102 *
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
Kirill A. Shutemov7b5f6992010-01-20 00:56:08 +0100107 */
108ssize_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
Kevin Wolf40ff6d72009-12-02 12:24:42 +0100129/*
130 * Opens a socket with FD_CLOEXEC set
131 */
132int 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);
Andre Przywara3a03bfa2009-12-18 10:45:07 +0100138 if (ret != -1 || errno != EINVAL) {
139 return ret;
140 }
141#endif
Kevin Wolf40ff6d72009-12-02 12:24:42 +0100142 ret = socket(domain, type, protocol);
143 if (ret >= 0) {
144 qemu_set_cloexec(ret);
145 }
Kevin Wolf40ff6d72009-12-02 12:24:42 +0100146
147 return ret;
148}
149
150/*
151 * Accept a connection and set FD_CLOEXEC
152 */
153int 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);
Kevin Wolf347ed552010-01-13 16:20:56 +0100159 if (ret != -1 || errno != ENOSYS) {
Andre Przywara3a03bfa2009-12-18 10:45:07 +0100160 return ret;
161 }
162#endif
Kevin Wolf40ff6d72009-12-02 12:24:42 +0100163 ret = accept(s, addr, addrlen);
164 if (ret >= 0) {
165 qemu_set_cloexec(ret);
166 }
Kevin Wolf40ff6d72009-12-02 12:24:42 +0100167
168 return ret;
169}