/* * QEMU low level functions * * Copyright (c) 2003 Fabrice Bellard * * 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. */#include <stdlib.h>#include <stdio.h>#include <stdarg.h>#include <string.h>#include <errno.h>#include <unistd.h>#include <fcntl.h>#ifdef HOST_SOLARIS#include <sys/types.h>#include <sys/statvfs.h>#endif#include "qemu-common.h"#include "sysemu.h"#ifdef _WIN32#define WIN32_LEAN_AND_MEAN#include <windows.h>#elif defined(_BSD)#include <stdlib.h>#else#include <malloc.h>#endifvoid *get_mmap_addr(unsigned long size){    return NULL;}void qemu_free(void *ptr){    free(ptr);}void *qemu_malloc(size_t size){    return malloc(size);}#if defined(_WIN32)void *qemu_memalign(size_t alignment, size_t size){    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);}void *qemu_vmalloc(size_t size){    /* FIXME: this is not exactly optimal solution since VirtualAlloc       has 64Kb granularity, but at least it guarantees us that the       memory is page aligned. */    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);}void qemu_vfree(void *ptr){    VirtualFree(ptr, 0, MEM_RELEASE);}#else#if defined(USE_KQEMU)#include <sys/vfs.h>#include <sys/mman.h>#include <fcntl.h>static void *kqemu_vmalloc(size_t size){    static int phys_ram_fd = -1;    static int phys_ram_size = 0;    const char *tmpdir;    char phys_ram_file[1024];    void *ptr;#ifdef HOST_SOLARIS    struct statvfs stfs;#else    struct statfs stfs;#endif    if (phys_ram_fd < 0) {        tmpdir = getenv("QEMU_TMPDIR");        if (!tmpdir)#ifdef HOST_SOLARIS            tmpdir = "/tmp";        if (statvfs(tmpdir, &stfs) == 0) {#else            tmpdir = "/dev/shm";        if (statfs(tmpdir, &stfs) == 0) {#endif            int64_t free_space;            int ram_mb;            extern int ram_size;            free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;            if ((ram_size + 8192 * 1024) >= free_space) {                ram_mb = (ram_size / (1024 * 1024));                fprintf(stderr,                        "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",                        tmpdir, ram_mb);                if (strcmp(tmpdir, "/dev/shm") == 0) {                    fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"                            "umount /dev/shm\n"                            "mount -t tmpfs -o size=%dm none /dev/shm\n",                            ram_mb + 16);                } else {                    fprintf(stderr,                            "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"                            "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"                            "temporary RAM file will be opened.\n");                }                fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");                exit(1);            }        }        snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",                 tmpdir);        phys_ram_fd = mkstemp(phys_ram_file);        if (phys_ram_fd < 0) {            fprintf(stderr,                    "warning: could not create temporary file in '%s'.\n"                    "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"                    "Using '/tmp' as fallback.\n",                    tmpdir);            snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",                     "/tmp");            phys_ram_fd = mkstemp(phys_ram_file);            if (phys_ram_fd < 0) {                fprintf(stderr, "Could not create temporary memory file '%s'\n",                        phys_ram_file);                exit(1);            }        }        unlink(phys_ram_file);    }    size = (size + 4095) & ~4095;    ftruncate(phys_ram_fd, phys_ram_size + size);    ptr = mmap(NULL,               size,               PROT_WRITE | PROT_READ, MAP_SHARED,               phys_ram_fd, phys_ram_size);    if (ptr == MAP_FAILED) {        fprintf(stderr, "Could not map physical memory\n");        exit(1);    }    phys_ram_size += size;    return ptr;}static void kqemu_vfree(void *ptr){    /* may be useful some day, but currently we do not need to free */}#endifvoid *qemu_memalign(size_t alignment, size_t size){#if defined(_POSIX_C_SOURCE)    int ret;    void *ptr;    ret = posix_memalign(&ptr, alignment, size);    if (ret != 0)        return NULL;    return ptr;#elif defined(_BSD)    return valloc(size);#else    return memalign(alignment, size);#endif}/* alloc shared memory pages */void *qemu_vmalloc(size_t size){#if defined(USE_KQEMU)    if (kqemu_allowed)        return kqemu_vmalloc(size);#endif#ifdef _BSD    return valloc(size);#else    return memalign(4096, size);#endif}void qemu_vfree(void *ptr){#if defined(USE_KQEMU)    if (kqemu_allowed)        kqemu_vfree(ptr);#endif    free(ptr);}#endifvoid *qemu_mallocz(size_t size){    void *ptr;    ptr = qemu_malloc(size);    if (!ptr)        return NULL;    memset(ptr, 0, size);    return ptr;}char *qemu_strdup(const char *str){    char *ptr;    ptr = qemu_malloc(strlen(str) + 1);    if (!ptr)        return NULL;    strcpy(ptr, str);    return ptr;}int qemu_create_pidfile(const char *filename){    char buffer[128];    int len;#ifndef _WIN32    int fd;    fd = open(filename, O_RDWR | O_CREAT, 0600);    if (fd == -1)        return -1;    if (lockf(fd, F_TLOCK, 0) == -1)        return -1;    len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());    if (write(fd, buffer, len) != len)        return -1;#else    HANDLE file;    DWORD flags;    OVERLAPPED overlap;    BOOL ret;    /* Open for writing with no sharing. */    file = CreateFile(filename, GENERIC_WRITE, 0, NULL,		      OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);    if (file == INVALID_HANDLE_VALUE)      return -1;    flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;    overlap.hEvent = 0;    /* Lock 1 byte. */    ret = LockFileEx(file, flags, 0, 0, 1, &overlap);    if (ret == 0)      return -1;    /* Write PID to file. */    len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());    ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,		      &overlap, NULL);    if (ret == 0)      return -1;#endif    return 0;}#ifdef _WIN32/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */#define _W32_FT_OFFSET (116444736000000000ULL)int qemu_gettimeofday(qemu_timeval *tp){  union {    unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */    FILETIME ft;  }  _now;  if(tp)    {      GetSystemTimeAsFileTime (&_now.ft);      tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );      tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);    }  /* Always return 0 as per Open Group Base Specifications Issue 6.     Do not set errno on error.  */  return 0;}#endif /* _WIN32 */