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>

 /* Needed early for CONFIG_BSD etc. */
 #include "config-host.h"

 #ifdef CONFIG_SOLARIS
 #include <sys/types.h>
 #include <sys/statvfs.h>
 #endif

 #ifdef CONFIG_EVENTFD
 #include <sys/eventfd.h>
 #endif

 #ifdef _WIN32
 #include <windows.h>
 #elif defined(CONFIG_BSD)
 #include <stdlib.h>
 #else
 #include <malloc.h>
 #endif

 #include "qemu-common.h"
 #include "sysemu.h"
 #include "qemu_socket.h"

 #if !defined(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__)
 static void *oom_check(void *ptr)
 {
     if (ptr == NULL) {
 #if defined(_WIN32)
         fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
 #else
         fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
 #endif
         abort();
     }
     return ptr;
 }
 #endif

 #if defined(_WIN32)
 void *qemu_memalign(size_t alignment, size_t size)
 {
     if (!size) {
         abort();
     }
     return oom_check(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. */
     if (!size) {
         abort();
     }
     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
 }

 void qemu_vfree(void *ptr)
 {
     VirtualFree(ptr, 0, MEM_RELEASE);
 }

 #else

 void *qemu_memalign(size_t alignment, size_t size)
 {
 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
     int ret;
     void *ptr;
     ret = posix_memalign(&ptr, alignment, size);
     if (ret != 0) {
         fprintf(stderr, "Failed to allocate %zu B: %s\n",
                 size, strerror(ret));
         abort();
     }
     return ptr;
 #elif defined(CONFIG_BSD)
     return oom_check(valloc(size));
 #else
     return oom_check(memalign(alignment, size));
 #endif
 }

 /* alloc shared memory pages */
 void *qemu_vmalloc(size_t size)
 {
     return qemu_memalign(getpagesize(), size);
 }

 void qemu_vfree(void *ptr)
 {
     free(ptr);
 }

 #endif

 int qemu_create_pidfile(const char *filename)
 {
     char buffer[128];
     int len;
 #ifndef _WIN32
     int fd;

     fd = qemu_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;
     OVERLAPPED overlap;
     BOOL ret;
     memset(&overlap, 0, sizeof(overlap));

     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 		      OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

     if (file == INVALID_HANDLE_VALUE)
       return -1;

     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

 /* mingw32 needs ffs for compilations without optimization. */
 int ffs(int i)
 {
     /* Use gcc's builtin ffs. */
     return __builtin_ffs(i);
 }

 /* 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;
 }

 void qemu_set_cloexec(int fd)
 {
 }

 #else

 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);
 }

 #endif

 /*
  * Opens a file with FD_CLOEXEC set
  */
 int qemu_open(const char *name, int flags, ...)
 {
     int ret;
     int mode = 0;

     if (flags & O_CREAT) {
         va_list ap;

         va_start(ap, flags);
         mode = va_arg(ap, int);
         va_end(ap);
     }

 #ifdef O_CLOEXEC
     ret = open(name, flags | O_CLOEXEC, mode);
 #else
     ret = open(name, flags, mode);
     if (ret >= 0) {
         qemu_set_cloexec(ret);
     }
 #endif

     return ret;
 }

 /*
  * A variant of write(2) which handles partial write.
  *
  * Return the number of bytes transferred.
  * Set errno if fewer than `count' bytes are written.
  *
  * This function don't work with non-blocking fd's.
  * Any of the possibilities with non-bloking fd's is bad:
  *   - return a short write (then name is wrong)
  *   - busy wait adding (errno == EAGAIN) to the loop
  */
 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 {
     ssize_t ret = 0;
     ssize_t total = 0;

     while (count) {
         ret = write(fd, buf, count);
         if (ret < 0) {
             if (errno == EINTR)
                 continue;
             break;
         }

         count -= ret;
         buf += ret;
         total += ret;
     }

     return total;
 }

 #ifndef _WIN32
 /*
  * Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set.
  */
 int qemu_eventfd(int fds[2])
 {
 #ifdef CONFIG_EVENTFD
     int ret;

     ret = eventfd(0, 0);
     if (ret >= 0) {
         fds[0] = ret;
         qemu_set_cloexec(ret);
         if ((fds[1] = dup(ret)) == -1) {
             close(ret);
             return -1;
         }
         qemu_set_cloexec(fds[1]);
         return 0;
     }

     if (errno != ENOSYS) {
         return -1;
     }
 #endif

     return qemu_pipe(fds);
 }

 /*
  * 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;
 }
 #endif

 /*
  * Opens a socket with FD_CLOEXEC set
  */
 int qemu_socket(int domain, int type, int protocol)
 {
     int ret;

 #ifdef SOCK_CLOEXEC
     ret = socket(domain, type | SOCK_CLOEXEC, protocol);
     if (ret != -1 || errno != EINVAL) {
         return ret;
     }
 #endif
     ret = socket(domain, type, protocol);
     if (ret >= 0) {
         qemu_set_cloexec(ret);
     }

     return ret;
 }

 /*
  * Accept a connection and set FD_CLOEXEC
  */
 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 {
     int ret;

 #ifdef CONFIG_ACCEPT4
     ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
     if (ret != -1 || errno != ENOSYS) {
         return ret;
     }
 #endif
     ret = accept(s, addr, addrlen);
     if (ret >= 0) {
         qemu_set_cloexec(ret);
     }

     return ret;
 }
	/*
	* 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>

	/* Needed early for CONFIG_BSD etc. */
	#include "config-host.h"

	#ifdef CONFIG_SOLARIS
	#include <sys/types.h>
	#include <sys/statvfs.h>
	#endif

	#ifdef CONFIG_EVENTFD
	#include <sys/eventfd.h>
	#endif

	#ifdef _WIN32
	#include <windows.h>
	#elif defined(CONFIG_BSD)
	#include <stdlib.h>
	#else
	#include <malloc.h>
	#endif

	#include "qemu-common.h"
	#include "sysemu.h"
	#include "qemu_socket.h"

	#if !defined(_POSIX_C_SOURCE) \|\| defined(_WIN32) \|\| defined(__sun__)
	static void oom_check(void ptr)
	{
	if (ptr == NULL) {
	#if defined(_WIN32)
	fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
	#else
	fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
	#endif
	abort();
	}
	return ptr;
	}
	#endif

	#if defined(_WIN32)
	void *qemu_memalign(size_t alignment, size_t size)
	{
	if (!size) {
	abort();
	}
	return oom_check(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. */
	if (!size) {
	abort();
	}
	return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
	}

	void qemu_vfree(void *ptr)
	{
	VirtualFree(ptr, 0, MEM_RELEASE);
	}

	#else

	void *qemu_memalign(size_t alignment, size_t size)
	{
	#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
	int ret;
	void *ptr;
	ret = posix_memalign(&ptr, alignment, size);
	if (ret != 0) {
	fprintf(stderr, "Failed to allocate %zu B: %s\n",
	size, strerror(ret));
	abort();
	}
	return ptr;
	#elif defined(CONFIG_BSD)
	return oom_check(valloc(size));
	#else
	return oom_check(memalign(alignment, size));
	#endif
	}

	/* alloc shared memory pages */
	void *qemu_vmalloc(size_t size)
	{
	return qemu_memalign(getpagesize(), size);
	}

	void qemu_vfree(void *ptr)
	{
	free(ptr);
	}

	#endif

	int qemu_create_pidfile(const char *filename)
	{
	char buffer[128];
	int len;
	#ifndef _WIN32
	int fd;

	fd = qemu_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;
	OVERLAPPED overlap;
	BOOL ret;
	memset(&overlap, 0, sizeof(overlap));

	file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
	OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

	if (file == INVALID_HANDLE_VALUE)
	return -1;

	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

	/* mingw32 needs ffs for compilations without optimization. */
	int ffs(int i)
	{
	/* Use gcc's builtin ffs. */
	return __builtin_ffs(i);
	}

	/* 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;
	}

	void qemu_set_cloexec(int fd)
	{
	}

	#else

	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);
	}

	#endif

	/*
	* Opens a file with FD_CLOEXEC set
	*/
	int qemu_open(const char *name, int flags, ...)
	{
	int ret;
	int mode = 0;

	if (flags & O_CREAT) {
	va_list ap;

	va_start(ap, flags);
	mode = va_arg(ap, int);
	va_end(ap);
	}

	#ifdef O_CLOEXEC
	ret = open(name, flags \| O_CLOEXEC, mode);
	#else
	ret = open(name, flags, mode);
	if (ret >= 0) {
	qemu_set_cloexec(ret);
	}
	#endif

	return ret;
	}

	/*
	* A variant of write(2) which handles partial write.
	*
	* Return the number of bytes transferred.
	* Set errno if fewer than `count' bytes are written.
	*
	* This function don't work with non-blocking fd's.
	* Any of the possibilities with non-bloking fd's is bad:
	* - return a short write (then name is wrong)
	* - busy wait adding (errno == EAGAIN) to the loop
	*/
	ssize_t qemu_write_full(int fd, const void *buf, size_t count)
	{
	ssize_t ret = 0;
	ssize_t total = 0;

	while (count) {
	ret = write(fd, buf, count);
	if (ret < 0) {
	if (errno == EINTR)
	continue;
	break;
	}

	count -= ret;
	buf += ret;
	total += ret;
	}

	return total;
	}

	#ifndef _WIN32
	/*
	* Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set.
	*/
	int qemu_eventfd(int fds[2])
	{
	#ifdef CONFIG_EVENTFD
	int ret;

	ret = eventfd(0, 0);
	if (ret >= 0) {
	fds[0] = ret;
	qemu_set_cloexec(ret);
	if ((fds[1] = dup(ret)) == -1) {
	close(ret);
	return -1;
	}
	qemu_set_cloexec(fds[1]);
	return 0;
	}

	if (errno != ENOSYS) {
	return -1;
	}
	#endif

	return qemu_pipe(fds);
	}

	/*
	* 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;
	}
	#endif

	/*
	* Opens a socket with FD_CLOEXEC set
	*/
	int qemu_socket(int domain, int type, int protocol)
	{
	int ret;

	#ifdef SOCK_CLOEXEC
	ret = socket(domain, type \| SOCK_CLOEXEC, protocol);
	if (ret != -1 \|\| errno != EINVAL) {
	return ret;
	}
	#endif
	ret = socket(domain, type, protocol);
	if (ret >= 0) {
	qemu_set_cloexec(ret);
	}

	return ret;
	}

	/*
	* Accept a connection and set FD_CLOEXEC
	*/
	int qemu_accept(int s, struct sockaddr addr, socklen_t addrlen)
	{
	int ret;

	#ifdef CONFIG_ACCEPT4
	ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
	if (ret != -1 \|\| errno != ENOSYS) {
	return ret;
	}
	#endif
	ret = accept(s, addr, addrlen);
	if (ret >= 0) {
	qemu_set_cloexec(ret);
	}

	return ret;
	}