| /* |
| * os-posix-lib.c |
| * |
| * Copyright (c) 2003-2008 Fabrice Bellard |
| * Copyright (c) 2010 Red Hat, Inc. |
| * |
| * QEMU library functions on POSIX which are shared between QEMU and |
| * the QEMU tools. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| /* The following block of code temporarily renames the daemon() function so the |
| compiler does not see the warning associated with it in stdlib.h on OSX */ |
| #ifdef __APPLE__ |
| #define daemon qemu_fake_daemon_function |
| #include <stdlib.h> |
| #undef daemon |
| extern int daemon(int, int); |
| #endif |
| |
| #if defined(__linux__) && defined(__x86_64__) |
| /* Use 2 MiB alignment so transparent hugepages can be used by KVM. |
| Valgrind does not support alignments larger than 1 MiB, |
| therefore we need special code which handles running on Valgrind. */ |
| # define QEMU_VMALLOC_ALIGN (512 * 4096) |
| # define CONFIG_VALGRIND |
| #elif defined(__linux__) && defined(__s390x__) |
| /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ |
| # define QEMU_VMALLOC_ALIGN (256 * 4096) |
| #else |
| # define QEMU_VMALLOC_ALIGN getpagesize() |
| #endif |
| |
| #include "config-host.h" |
| #include "sysemu/sysemu.h" |
| #include "trace.h" |
| #include "qemu/sockets.h" |
| |
| #if defined(CONFIG_VALGRIND) |
| static int running_on_valgrind = -1; |
| #else |
| # define running_on_valgrind 0 |
| #endif |
| #ifdef CONFIG_LINUX |
| #include <sys/syscall.h> |
| #endif |
| |
| int qemu_get_thread_id(void) |
| { |
| #if defined(__linux__) |
| return syscall(SYS_gettid); |
| #else |
| return getpid(); |
| #endif |
| } |
| |
| int qemu_daemon(int nochdir, int noclose) |
| { |
| return daemon(nochdir, noclose); |
| } |
| |
| void *qemu_oom_check(void *ptr) |
| { |
| if (ptr == NULL) { |
| fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); |
| abort(); |
| } |
| return ptr; |
| } |
| |
| void *qemu_memalign(size_t alignment, size_t size) |
| { |
| void *ptr; |
| #if defined(_POSIX_C_SOURCE) && !defined(__sun__) |
| int ret; |
| ret = posix_memalign(&ptr, alignment, size); |
| if (ret != 0) { |
| fprintf(stderr, "Failed to allocate %zu B: %s\n", |
| size, strerror(ret)); |
| abort(); |
| } |
| #elif defined(CONFIG_BSD) |
| ptr = qemu_oom_check(valloc(size)); |
| #else |
| ptr = qemu_oom_check(memalign(alignment, size)); |
| #endif |
| trace_qemu_memalign(alignment, size, ptr); |
| return ptr; |
| } |
| |
| /* conflicts with qemu_vmalloc in bsd-user/mmap.c */ |
| #if !defined(CONFIG_BSD_USER) |
| /* alloc shared memory pages */ |
| void *qemu_vmalloc(size_t size) |
| { |
| void *ptr; |
| size_t align = QEMU_VMALLOC_ALIGN; |
| |
| #if defined(CONFIG_VALGRIND) |
| if (running_on_valgrind < 0) { |
| /* First call, test whether we are running on Valgrind. |
| This is a substitute for RUNNING_ON_VALGRIND from valgrind.h. */ |
| const char *ld = getenv("LD_PRELOAD"); |
| running_on_valgrind = (ld != NULL && strstr(ld, "vgpreload")); |
| } |
| #endif |
| |
| if (size < align || running_on_valgrind) { |
| align = getpagesize(); |
| } |
| ptr = qemu_memalign(align, size); |
| trace_qemu_vmalloc(size, ptr); |
| return ptr; |
| } |
| #endif |
| |
| void qemu_vfree(void *ptr) |
| { |
| trace_qemu_vfree(ptr); |
| free(ptr); |
| } |
| |
| void socket_set_block(int fd) |
| { |
| int f; |
| f = fcntl(fd, F_GETFL); |
| fcntl(fd, F_SETFL, f & ~O_NONBLOCK); |
| } |
| |
| void socket_set_nonblock(int fd) |
| { |
| int f; |
| f = fcntl(fd, F_GETFL); |
| fcntl(fd, F_SETFL, f | O_NONBLOCK); |
| } |
| |
| void qemu_set_cloexec(int fd) |
| { |
| int f; |
| f = fcntl(fd, F_GETFD); |
| fcntl(fd, F_SETFD, f | FD_CLOEXEC); |
| } |
| |
| /* |
| * Creates a pipe with FD_CLOEXEC set on both file descriptors |
| */ |
| int qemu_pipe(int pipefd[2]) |
| { |
| int ret; |
| |
| #ifdef CONFIG_PIPE2 |
| ret = pipe2(pipefd, O_CLOEXEC); |
| if (ret != -1 || errno != ENOSYS) { |
| return ret; |
| } |
| #endif |
| ret = pipe(pipefd); |
| if (ret == 0) { |
| qemu_set_cloexec(pipefd[0]); |
| qemu_set_cloexec(pipefd[1]); |
| } |
| |
| return ret; |
| } |
| |
| int qemu_utimens(const char *path, const struct timespec *times) |
| { |
| struct timeval tv[2], tv_now; |
| struct stat st; |
| int i; |
| #ifdef CONFIG_UTIMENSAT |
| int ret; |
| |
| ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW); |
| if (ret != -1 || errno != ENOSYS) { |
| return ret; |
| } |
| #endif |
| /* Fallback: use utimes() instead of utimensat() */ |
| |
| /* happy if special cases */ |
| if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) { |
| return 0; |
| } |
| if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) { |
| return utimes(path, NULL); |
| } |
| |
| /* prepare for hard cases */ |
| if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) { |
| gettimeofday(&tv_now, NULL); |
| } |
| if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) { |
| stat(path, &st); |
| } |
| |
| for (i = 0; i < 2; i++) { |
| if (times[i].tv_nsec == UTIME_NOW) { |
| tv[i].tv_sec = tv_now.tv_sec; |
| tv[i].tv_usec = tv_now.tv_usec; |
| } else if (times[i].tv_nsec == UTIME_OMIT) { |
| tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime; |
| tv[i].tv_usec = 0; |
| } else { |
| tv[i].tv_sec = times[i].tv_sec; |
| tv[i].tv_usec = times[i].tv_nsec / 1000; |
| } |
| } |
| |
| return utimes(path, &tv[0]); |
| } |