--- /dev/null
+/*
+ * 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 <stdbool.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+/* Needed early for CONFIG_BSD etc. */
+#include "config-host.h"
+
+#if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE)
+#include <sys/mman.h>
+#endif
+
+#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
+
+#include "qemu-common.h"
+#include "qemu/sockets.h"
+#include "qemu/error-report.h"
+#include "monitor/monitor.h"
+
+static bool fips_enabled = false;
+
+static const char *qemu_version = QEMU_VERSION;
+
+int socket_set_cork(int fd, int v)
+{
+#if defined(SOL_TCP) && defined(TCP_CORK)
+ return qemu_setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
+#else
+ return 0;
+#endif
+}
+
+int socket_set_nodelay(int fd)
+{
+ int v = 1;
+ return qemu_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v));
+}
+
+int qemu_madvise(void *addr, size_t len, int advice)
+{
+ 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
+}
+
+#ifndef _WIN32
+/*
+ * Dups an fd and sets the flags
+ */
+static int qemu_dup_flags(int fd, int flags)
+{
+ int ret;
+ int serrno;
+ int dup_flags;
+
+#ifdef F_DUPFD_CLOEXEC
+ ret = fcntl(fd, F_DUPFD_CLOEXEC, 0);
+#else
+ ret = dup(fd);
+ if (ret != -1) {
+ qemu_set_cloexec(ret);
+ }
+#endif
+ if (ret == -1) {
+ goto fail;
+ }
+
+ dup_flags = fcntl(ret, F_GETFL);
+ if (dup_flags == -1) {
+ goto fail;
+ }
+
+ if ((flags & O_SYNC) != (dup_flags & O_SYNC)) {
+ errno = EINVAL;
+ goto fail;
+ }
+
+ /* Set/unset flags that we can with fcntl */
+ if (fcntl(ret, F_SETFL, flags) == -1) {
+ goto fail;
+ }
+
+ /* Truncate the file in the cases that open() would truncate it */
+ if (flags & O_TRUNC ||
+ ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) {
+ if (ftruncate(ret, 0) == -1) {
+ goto fail;
+ }
+ }
+
+ return ret;
+
+fail:
+ serrno = errno;
+ if (ret != -1) {
+ close(ret);
+ }
+ errno = serrno;
+ return -1;
+}
+
+static int qemu_parse_fdset(const char *param)
+{
+ return qemu_parse_fd(param);
+}
+#endif
+
+/*
+ * Opens a file with FD_CLOEXEC set
+ */
+int qemu_open(const char *name, int flags, ...)
+{
+ int ret;
+ int mode = 0;
+
+#ifndef _WIN32
+ const char *fdset_id_str;
+
+ /* Attempt dup of fd from fd set */
+ if (strstart(name, "/dev/fdset/", &fdset_id_str)) {
+ int64_t fdset_id;
+ int fd, dupfd;
+
+ fdset_id = qemu_parse_fdset(fdset_id_str);
+ if (fdset_id == -1) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ fd = monitor_fdset_get_fd(fdset_id, flags);
+ if (fd == -1) {
+ return -1;
+ }
+
+ dupfd = qemu_dup_flags(fd, flags);
+ if (dupfd == -1) {
+ return -1;
+ }
+
+ ret = monitor_fdset_dup_fd_add(fdset_id, dupfd);
+ if (ret == -1) {
+ close(dupfd);
+ errno = EINVAL;
+ return -1;
+ }
+
+ return dupfd;
+ }
+#endif
+
+ 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
+
+#ifdef O_DIRECT
+ if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) {
+ error_report("file system may not support O_DIRECT");
+ errno = EINVAL; /* in case it was clobbered */
+ }
+#endif /* O_DIRECT */
+
+ return ret;
+}
+
+int qemu_close(int fd)
+{
+ int64_t fdset_id;
+
+ /* Close fd that was dup'd from an fdset */
+ fdset_id = monitor_fdset_dup_fd_find(fd);
+ if (fdset_id != -1) {
+ int ret;
+
+ ret = close(fd);
+ if (ret == 0) {
+ monitor_fdset_dup_fd_remove(fd);
+ }
+
+ return ret;
+ }
+
+ return close(fd);
+}
+
+/*
+ * 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;
+}
+
+/*
+ * 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;
+}
+
+void qemu_set_version(const char *version)
+{
+ qemu_version = version;
+}
+
+const char *qemu_get_version(void)
+{
+ return qemu_version;
+}
+
+void fips_set_state(bool requested)
+{
+#ifdef __linux__
+ if (requested) {
+ FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r");
+ if (fds != NULL) {
+ fips_enabled = (fgetc(fds) == '1');
+ fclose(fds);
+ }
+ }
+#else
+ fips_enabled = false;
+#endif /* __linux__ */
+
+#ifdef _FIPS_DEBUG
+ fprintf(stderr, "FIPS mode %s (requested %s)\n",
+ (fips_enabled ? "enabled" : "disabled"),
+ (requested ? "enabled" : "disabled"));
+#endif
+}
+
+bool fips_get_state(void)
+{
+ return fips_enabled;
+}
+
+#ifdef _WIN32
+static void socket_cleanup(void)
+{
+ WSACleanup();
+}
+#endif
+
+int socket_init(void)
+{
+#ifdef _WIN32
+ WSADATA Data;
+ int ret, err;
+
+ ret = WSAStartup(MAKEWORD(2, 2), &Data);
+ if (ret != 0) {
+ err = WSAGetLastError();
+ fprintf(stderr, "WSAStartup: %d\n", err);
+ return -1;
+ }
+ atexit(socket_cleanup);
+#endif
+ return 0;
+}
+
+#if !GLIB_CHECK_VERSION(2, 31, 0)
+/* Ensure that glib is running in multi-threaded mode
+ * Old versions of glib require explicit initialization. Failure to do
+ * this results in the single-threaded code paths being taken inside
+ * glib. For example, the g_slice allocator will not be thread-safe
+ * and cause crashes.
+ */
+static void __attribute__((constructor)) thread_init(void)
+{
+ if (!g_thread_supported()) {
+ g_thread_init(NULL);
+ }
+}
+#endif
+
+#ifndef CONFIG_IOVEC
+/* helper function for iov_send_recv() */
+static ssize_t
+readv_writev(int fd, const struct iovec *iov, int iov_cnt, bool do_write)
+{
+ unsigned i = 0;
+ ssize_t ret = 0;
+ while (i < iov_cnt) {
+ ssize_t r = do_write
+ ? write(fd, iov[i].iov_base, iov[i].iov_len)
+ : read(fd, iov[i].iov_base, iov[i].iov_len);
+ if (r > 0) {
+ ret += r;
+ } else if (!r) {
+ break;
+ } else if (errno == EINTR) {
+ continue;
+ } else {
+ /* else it is some "other" error,
+ * only return if there was no data processed. */
+ if (ret == 0) {
+ ret = -1;
+ }
+ break;
+ }
+ i++;
+ }
+ return ret;
+}
+
+ssize_t
+readv(int fd, const struct iovec *iov, int iov_cnt)
+{
+ return readv_writev(fd, iov, iov_cnt, false);
+}
+
+ssize_t
+writev(int fd, const struct iovec *iov, int iov_cnt)
+{
+ return readv_writev(fd, iov, iov_cnt, true);
+}
+#endif
Code Review / kvmfornfv.git / blobdiff