bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU low level functions |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 4 | * Copyright (c) 2003 Fabrice Bellard |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 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> |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 28 | #include <errno.h> |
| 29 | #include <unistd.h> |
ths | aa26bb2 | 2007-03-25 21:33:06 +0000 | [diff] [blame] | 30 | #include <fcntl.h> |
Paolo Bonzini | f582af5 | 2010-02-02 20:33:11 +0100 | [diff] [blame] | 31 | |
| 32 | /* Needed early for CONFIG_BSD etc. */ |
| 33 | #include "config-host.h" |
| 34 | |
Andreas Färber | e78815a | 2010-09-25 11:26:05 +0000 | [diff] [blame] | 35 | #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) |
| 36 | #include <sys/mman.h> |
| 37 | #endif |
| 38 | |
Juan Quintela | dfe5fff | 2009-07-27 16:12:40 +0200 | [diff] [blame] | 39 | #ifdef CONFIG_SOLARIS |
ths | 605686c | 2007-01-17 23:31:19 +0000 | [diff] [blame] | 40 | #include <sys/types.h> |
| 41 | #include <sys/statvfs.h> |
Andreas Färber | e78815a | 2010-09-25 11:26:05 +0000 | [diff] [blame] | 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); |
ths | 605686c | 2007-01-17 23:31:19 +0000 | [diff] [blame] | 45 | #endif |
bellard | ea88812 | 2004-02-16 22:12:40 +0000 | [diff] [blame] | 46 | |
blueswir1 | 511d2b1 | 2009-03-07 15:32:56 +0000 | [diff] [blame] | 47 | #include "qemu-common.h" |
Stefan Hajnoczi | cd245a1 | 2010-05-22 18:09:25 +0100 | [diff] [blame] | 48 | #include "trace.h" |
blueswir1 | 511d2b1 | 2009-03-07 15:32:56 +0000 | [diff] [blame] | 49 | #include "sysemu.h" |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 50 | #include "qemu_socket.h" |
| 51 | |
Andreas Färber | e78815a | 2010-09-25 11:26:05 +0000 | [diff] [blame] | 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 | |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 68 | |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 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 | |
Kirill A. Shutemov | 7b5f699 | 2010-01-20 00:56:08 +0100 | [diff] [blame] | 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. |
Juan Quintela | 1298cb6 | 2010-03-04 10:00:39 +0100 | [diff] [blame] | 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 |
Kirill A. Shutemov | 7b5f699 | 2010-01-20 00:56:08 +0100 | [diff] [blame] | 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 | |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 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); |
Andre Przywara | 3a03bfa | 2009-12-18 10:45:07 +0100 | [diff] [blame] | 138 | if (ret != -1 || errno != EINVAL) { |
| 139 | return ret; |
| 140 | } |
| 141 | #endif |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 142 | ret = socket(domain, type, protocol); |
| 143 | if (ret >= 0) { |
| 144 | qemu_set_cloexec(ret); |
| 145 | } |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 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); |
Kevin Wolf | 347ed55 | 2010-01-13 16:20:56 +0100 | [diff] [blame] | 159 | if (ret != -1 || errno != ENOSYS) { |
Andre Przywara | 3a03bfa | 2009-12-18 10:45:07 +0100 | [diff] [blame] | 160 | return ret; |
| 161 | } |
| 162 | #endif |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 163 | ret = accept(s, addr, addrlen); |
| 164 | if (ret >= 0) { |
| 165 | qemu_set_cloexec(ret); |
| 166 | } |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 167 | |
| 168 | return ret; |
| 169 | } |