+++ /dev/null
-/*
- * 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]);
-}
projects / qemu.git / blobdiff