Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * os-posix-lib.c |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright (c) 2010 Red Hat, Inc. |
| 6 | * |
| 7 | * QEMU library functions on POSIX which are shared between QEMU and |
| 8 | * the QEMU tools. |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 26 | * THE SOFTWARE. |
| 27 | */ |
| 28 | |
Alexandre Raymond | f97742d | 2011-06-06 23:34:10 -0400 | [diff] [blame] | 29 | /* The following block of code temporarily renames the daemon() function so the |
| 30 | compiler does not see the warning associated with it in stdlib.h on OSX */ |
| 31 | #ifdef __APPLE__ |
| 32 | #define daemon qemu_fake_daemon_function |
| 33 | #include <stdlib.h> |
| 34 | #undef daemon |
| 35 | extern int daemon(int, int); |
| 36 | #endif |
| 37 | |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 38 | #if defined(__linux__) && defined(__x86_64__) |
| 39 | /* Use 2MB alignment so transparent hugepages can be used by KVM */ |
| 40 | # define QEMU_VMALLOC_ALIGN (512 * 4096) |
| 41 | #else |
| 42 | # define QEMU_VMALLOC_ALIGN getpagesize() |
| 43 | #endif |
| 44 | |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 45 | #include "config-host.h" |
| 46 | #include "sysemu.h" |
| 47 | #include "trace.h" |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 48 | #include "qemu_socket.h" |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 49 | |
Alexandre Raymond | f97742d | 2011-06-06 23:34:10 -0400 | [diff] [blame] | 50 | |
| 51 | |
| 52 | int qemu_daemon(int nochdir, int noclose) |
| 53 | { |
| 54 | return daemon(nochdir, noclose); |
| 55 | } |
| 56 | |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 57 | void *qemu_oom_check(void *ptr) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 58 | { |
| 59 | if (ptr == NULL) { |
| 60 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); |
| 61 | abort(); |
| 62 | } |
| 63 | return ptr; |
| 64 | } |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 65 | |
| 66 | void *qemu_memalign(size_t alignment, size_t size) |
| 67 | { |
| 68 | void *ptr; |
| 69 | #if defined(_POSIX_C_SOURCE) && !defined(__sun__) |
| 70 | int ret; |
| 71 | ret = posix_memalign(&ptr, alignment, size); |
| 72 | if (ret != 0) { |
| 73 | fprintf(stderr, "Failed to allocate %zu B: %s\n", |
| 74 | size, strerror(ret)); |
| 75 | abort(); |
| 76 | } |
| 77 | #elif defined(CONFIG_BSD) |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 78 | ptr = qemu_oom_check(valloc(size)); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 79 | #else |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 80 | ptr = qemu_oom_check(memalign(alignment, size)); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 81 | #endif |
| 82 | trace_qemu_memalign(alignment, size, ptr); |
| 83 | return ptr; |
| 84 | } |
| 85 | |
| 86 | /* alloc shared memory pages */ |
| 87 | void *qemu_vmalloc(size_t size) |
| 88 | { |
Jes Sorensen | c7f4111 | 2011-07-25 17:13:36 +0200 | [diff] [blame] | 89 | void *ptr; |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 90 | size_t align = QEMU_VMALLOC_ALIGN; |
| 91 | |
| 92 | if (size < align) { |
| 93 | align = getpagesize(); |
| 94 | } |
| 95 | ptr = qemu_memalign(align, size); |
Jes Sorensen | c7f4111 | 2011-07-25 17:13:36 +0200 | [diff] [blame] | 96 | trace_qemu_vmalloc(size, ptr); |
| 97 | return ptr; |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | void qemu_vfree(void *ptr) |
| 101 | { |
| 102 | trace_qemu_vfree(ptr); |
| 103 | free(ptr); |
| 104 | } |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 105 | |
| 106 | void socket_set_nonblock(int fd) |
| 107 | { |
| 108 | int f; |
| 109 | f = fcntl(fd, F_GETFL); |
| 110 | fcntl(fd, F_SETFL, f | O_NONBLOCK); |
| 111 | } |
| 112 | |
| 113 | void qemu_set_cloexec(int fd) |
| 114 | { |
| 115 | int f; |
| 116 | f = fcntl(fd, F_GETFD); |
| 117 | fcntl(fd, F_SETFD, f | FD_CLOEXEC); |
| 118 | } |
Jes Sorensen | 70e72ce | 2010-10-26 10:39:21 +0200 | [diff] [blame] | 119 | |
| 120 | /* |
| 121 | * Creates a pipe with FD_CLOEXEC set on both file descriptors |
| 122 | */ |
| 123 | int qemu_pipe(int pipefd[2]) |
| 124 | { |
| 125 | int ret; |
| 126 | |
| 127 | #ifdef CONFIG_PIPE2 |
| 128 | ret = pipe2(pipefd, O_CLOEXEC); |
| 129 | if (ret != -1 || errno != ENOSYS) { |
| 130 | return ret; |
| 131 | } |
| 132 | #endif |
| 133 | ret = pipe(pipefd); |
| 134 | if (ret == 0) { |
| 135 | qemu_set_cloexec(pipefd[0]); |
| 136 | qemu_set_cloexec(pipefd[1]); |
| 137 | } |
| 138 | |
| 139 | return ret; |
| 140 | } |
Hidetoshi Seto | 3867142 | 2010-11-24 11:38:10 +0900 | [diff] [blame] | 141 | |
| 142 | int qemu_utimensat(int dirfd, const char *path, const struct timespec *times, |
| 143 | int flags) |
| 144 | { |
| 145 | struct timeval tv[2], tv_now; |
| 146 | struct stat st; |
| 147 | int i; |
| 148 | #ifdef CONFIG_UTIMENSAT |
| 149 | int ret; |
| 150 | |
| 151 | ret = utimensat(dirfd, path, times, flags); |
| 152 | if (ret != -1 || errno != ENOSYS) { |
| 153 | return ret; |
| 154 | } |
| 155 | #endif |
| 156 | /* Fallback: use utimes() instead of utimensat() */ |
| 157 | |
| 158 | /* happy if special cases */ |
| 159 | if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) { |
| 160 | return 0; |
| 161 | } |
| 162 | if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) { |
| 163 | return utimes(path, NULL); |
| 164 | } |
| 165 | |
| 166 | /* prepare for hard cases */ |
| 167 | if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) { |
| 168 | gettimeofday(&tv_now, NULL); |
| 169 | } |
| 170 | if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) { |
| 171 | stat(path, &st); |
| 172 | } |
| 173 | |
| 174 | for (i = 0; i < 2; i++) { |
| 175 | if (times[i].tv_nsec == UTIME_NOW) { |
| 176 | tv[i].tv_sec = tv_now.tv_sec; |
| 177 | tv[i].tv_usec = tv_now.tv_usec; |
| 178 | } else if (times[i].tv_nsec == UTIME_OMIT) { |
| 179 | tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime; |
| 180 | tv[i].tv_usec = 0; |
| 181 | } else { |
| 182 | tv[i].tv_sec = times[i].tv_sec; |
| 183 | tv[i].tv_usec = times[i].tv_nsec / 1000; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | return utimes(path, &tv[0]); |
| 188 | } |