/*
* 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
#include <string.h>
#include <errno.h>
#include <unistd.h>
-#ifdef HOST_SOLARIS
+#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
-#include "cpu.h"
-#if defined(USE_KQEMU)
-#include "vl.h"
+#ifdef CONFIG_EVENTFD
+#include <sys/eventfd.h>
#endif
#ifdef _WIN32
#include <windows.h>
-#elif defined(_BSD)
+#elif defined(CONFIG_BSD)
#include <stdlib.h>
#else
#include <malloc.h>
#endif
-void *get_mmap_addr(unsigned long size)
-{
- return NULL;
-}
+#include "qemu-common.h"
+#include "sysemu.h"
+#include "qemu_socket.h"
-void qemu_free(void *ptr)
+#if !defined(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__)
+static void *oom_check(void *ptr)
{
- free(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
-void *qemu_malloc(size_t size)
+#if defined(_WIN32)
+void *qemu_memalign(size_t alignment, size_t size)
{
- return malloc(size);
+ if (!size) {
+ abort();
+ }
+ return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
}
-#if defined(_WIN32)
-
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);
+ if (!size) {
+ abort();
+ }
+ return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
}
void qemu_vfree(void *ptr)
#else
-#if defined(USE_KQEMU)
-
-#include <sys/vfs.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-
-void *kqemu_vmalloc(size_t size)
+void *qemu_memalign(size_t alignment, size_t size)
{
- static int phys_ram_fd = -1;
- static int phys_ram_size = 0;
- const char *tmpdir;
- char phys_ram_file[1024];
+#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
+ int ret;
void *ptr;
-#ifdef HOST_SOLARIS
- struct statvfs stfs;
+ 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
- struct statfs stfs;
+ return oom_check(memalign(alignment, size));
#endif
+}
- if (phys_ram_fd < 0) {
- tmpdir = getenv("QEMU_TMPDIR");
- if (!tmpdir)
-#ifdef HOST_SOLARIS
- tmpdir = "/tmp";
- if (statvfs(tmpdir, &stfs) == 0) {
+/* 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
- tmpdir = "/dev/shm";
- if (statfs(tmpdir, &stfs) == 0) {
+ 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
- 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;
+ return 0;
}
-void kqemu_vfree(void *ptr)
+#ifdef _WIN32
+
+/* mingw32 needs ffs for compilations without optimization. */
+int ffs(int i)
{
- /* may be useful some day, but currently we do not need to free */
+ /* Use gcc's builtin ffs. */
+ return __builtin_ffs(i);
}
-#endif
+/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
+#define _W32_FT_OFFSET (116444736000000000ULL)
-/* alloc shared memory pages */
-void *qemu_vmalloc(size_t size)
+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)
{
-#if defined(USE_KQEMU)
- if (kqemu_allowed)
- return kqemu_vmalloc(size);
+ 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
-#ifdef _BSD
- return valloc(size);
+
+/*
+ * 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
- return memalign(4096, size);
+ ret = open(name, flags, mode);
+ if (ret >= 0) {
+ qemu_set_cloexec(ret);
+ }
#endif
+
+ return ret;
}
-void qemu_vfree(void *ptr)
+/*
+ * 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])
{
-#if defined(USE_KQEMU)
- if (kqemu_allowed)
- kqemu_vfree(ptr);
+#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
- free(ptr);
+
+ 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
-void *qemu_mallocz(size_t size)
+/*
+ * Opens a socket with FD_CLOEXEC set
+ */
+int qemu_socket(int domain, int type, int protocol)
{
- void *ptr;
- ptr = qemu_malloc(size);
- if (!ptr)
- return NULL;
- memset(ptr, 0, size);
- return ptr;
+ 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;
}
-char *qemu_strdup(const char *str)
+/*
+ * Accept a connection and set FD_CLOEXEC
+ */
+int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
- char *ptr;
- ptr = qemu_malloc(strlen(str) + 1);
- if (!ptr)
- return NULL;
- strcpy(ptr, str);
- return ptr;
+ 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;
}
projects / qemu.git / blobdiff