osdep.c - qemu - Git at Google

 /*
  * 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>
 #endif

 #include "qemu_socket.h"

 #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)

 #ifdef __OpenBSD__
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/mount.h>
 #else
 #include <sys/vfs.h>
 #endif

 #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;
     void *ptr;

 #ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
     int map_anon = MAP_ANON;
 #else
     int map_anon = 0;
     const char *tmpdir;
     char phys_ram_file[1024];
 #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;

             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"
                             "mount -o remount,size=%dm /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);
 #endif /* !__OpenBSD__ */
     ptr = mmap(NULL,
                size,
                PROT_WRITE | PROT_READ, map_anon | 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 */
 }

 #endif

 void *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(getpagesize(), size);
 #endif
 }

 void qemu_vfree(void *ptr)
 {
 #if defined(USE_KQEMU)
     if (kqemu_allowed)
         kqemu_vfree(ptr);
 #endif
     free(ptr);
 }

 #endif

 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 */


 #ifdef _WIN32
 void socket_set_nonblock(int fd)
 {
     unsigned long opt = 1;
     ioctlsocket(fd, FIONBIO, &opt);
 }

 int inet_aton(const char *cp, struct in_addr *ia)
 {
     uint32_t addr = inet_addr(cp);
     if (addr == 0xffffffff)
 	return 0;
     ia->s_addr = addr;
     return 1;
 }
 #else
 void socket_set_nonblock(int fd)
 {
     int f;
     f = fcntl(fd, F_GETFL);
     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 }
 #endif
	/*
	* 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>
	#endif

	#include "qemu_socket.h"

	#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)

	#ifdef __OpenBSD__
	#include <sys/param.h>
	#include <sys/types.h>
	#include <sys/mount.h>
	#else
	#include <sys/vfs.h>
	#endif

	#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;
	void *ptr;

	#ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
	int map_anon = MAP_ANON;
	#else
	int map_anon = 0;
	const char *tmpdir;
	char phys_ram_file[1024];
	#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;

	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"
	"mount -o remount,size=%dm /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);
	#endif /* !__OpenBSD__ */
	ptr = mmap(NULL,
	size,
	PROT_WRITE \| PROT_READ, map_anon \| 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 */
	}

	#endif

	void *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(getpagesize(), size);
	#endif
	}

	void qemu_vfree(void *ptr)
	{
	#if defined(USE_KQEMU)
	if (kqemu_allowed)
	kqemu_vfree(ptr);
	#endif
	free(ptr);
	}

	#endif

	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 */


	#ifdef _WIN32
	void socket_set_nonblock(int fd)
	{
	unsigned long opt = 1;
	ioctlsocket(fd, FIONBIO, &opt);
	}

	int inet_aton(const char cp, struct in_addr ia)
	{
	uint32_t addr = inet_addr(cp);
	if (addr == 0xffffffff)
	return 0;
	ia->s_addr = addr;
	return 1;
	}
	#else
	void socket_set_nonblock(int fd)
	{
	int f;
	f = fcntl(fd, F_GETFL);
	fcntl(fd, F_SETFL, f \| O_NONBLOCK);
	}
	#endif