/*
* 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>
+#include <fcntl.h>
-#include "cpu.h"
-#if defined(USE_KQEMU)
-#include "vl.h"
-#endif
+/* Needed early for CONFIG_BSD etc. */
+#include "config-host.h"
-#ifdef _WIN32
-#include <windows.h>
-#elif defined(_BSD)
-#include <stdlib.h>
-#else
-#include <malloc.h>
+#if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE)
+#include <sys/mman.h>
#endif
-void *get_mmap_addr(unsigned long size)
-{
- return NULL;
-}
+#ifdef CONFIG_SOLARIS
+#include <sys/types.h>
+#include <sys/statvfs.h>
+/* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for
+ discussion about Solaris header problems */
+extern int madvise(caddr_t, size_t, int);
+#endif
-void qemu_free(void *ptr)
-{
- free(ptr);
-}
+#include "qemu-common.h"
+#include "trace.h"
+#include "qemu_socket.h"
-void *qemu_malloc(size_t size)
+int qemu_madvise(void *addr, size_t len, int advice)
{
- return malloc(size);
+ if (advice == QEMU_MADV_INVALID) {
+ errno = EINVAL;
+ return -1;
+ }
+#if defined(CONFIG_MADVISE)
+ return madvise(addr, len, advice);
+#elif defined(CONFIG_POSIX_MADVISE)
+ return posix_madvise(addr, len, advice);
+#else
+ errno = EINVAL;
+ return -1;
+#endif
}
-#if defined(_WIN32)
-void *qemu_vmalloc(size_t size)
+/*
+ * Opens a file with FD_CLOEXEC set
+ */
+int qemu_open(const char *name, int flags, ...)
{
- /* 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);
-}
+ int ret;
+ int mode = 0;
-void qemu_vfree(void *ptr)
-{
- VirtualFree(ptr, 0, MEM_RELEASE);
-}
+ if (flags & O_CREAT) {
+ va_list ap;
-#else
+ va_start(ap, flags);
+ mode = va_arg(ap, int);
+ va_end(ap);
+ }
-#if defined(USE_KQEMU)
+#ifdef O_CLOEXEC
+ ret = open(name, flags | O_CLOEXEC, mode);
+#else
+ ret = open(name, flags, mode);
+ if (ret >= 0) {
+ qemu_set_cloexec(ret);
+ }
+#endif
-#include <sys/vfs.h>
-#include <sys/mman.h>
-#include <fcntl.h>
+ return ret;
+}
-void *kqemu_vmalloc(size_t size)
+/*
+ * 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)
{
- static int phys_ram_fd = -1;
- static int phys_ram_size = 0;
- const char *tmpdir;
- char phys_ram_file[1024];
- void *ptr;
- struct statfs stfs;
-
- if (phys_ram_fd < 0) {
- tmpdir = getenv("QEMU_TMPDIR");
- if (!tmpdir)
- tmpdir = "/dev/shm";
- if (statfs(tmpdir, &stfs) == 0) {
- 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);
- }
+ ssize_t ret = 0;
+ ssize_t total = 0;
+
+ while (count) {
+ ret = write(fd, buf, count);
+ if (ret < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
}
- 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);
+
+ count -= ret;
+ buf += ret;
+ total += ret;
}
- phys_ram_size += size;
- return ptr;
+
+ return total;
}
-void kqemu_vfree(void *ptr)
+/*
+ * Opens a socket with FD_CLOEXEC set
+ */
+int qemu_socket(int domain, int type, int protocol)
{
- /* may be useful some day, but currently we do not need to free */
-}
+ 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);
+ }
-/* 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
+ return ret;
}
-void qemu_vfree(void *ptr)
+/*
+ * Accept a connection and set FD_CLOEXEC
+ */
+int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
-#if defined(USE_KQEMU)
- if (kqemu_allowed)
- kqemu_vfree(ptr);
-#endif
- free(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);
+ }
-void *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;
+ return ret;
}
projects / qemu.git / blobdiff