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/*
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* QEMU low level functions
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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/* Needed early for CONFIG_BSD etc. */
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#include "config-host.h" |
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#if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE)
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#include <sys/mman.h> |
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#endif
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#ifdef CONFIG_SOLARIS
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#include <sys/types.h> |
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#include <sys/statvfs.h> |
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/* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for
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discussion about Solaris header problems */
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extern int madvise(caddr_t, size_t, int); |
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#endif
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#ifdef CONFIG_EVENTFD
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#include <sys/eventfd.h> |
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#endif
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#ifdef _WIN32
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#include <windows.h> |
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#elif defined(CONFIG_BSD)
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#include <stdlib.h> |
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#else
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#include <malloc.h> |
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#endif
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#include "qemu-common.h" |
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#include "trace.h" |
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#include "sysemu.h" |
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#include "qemu_socket.h" |
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int qemu_madvise(void *addr, size_t len, int advice) |
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{ |
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if (advice == QEMU_MADV_INVALID) {
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errno = EINVAL; |
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return -1; |
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} |
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#if defined(CONFIG_MADVISE)
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return madvise(addr, len, advice);
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#elif defined(CONFIG_POSIX_MADVISE)
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return posix_madvise(addr, len, advice);
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#else
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errno = EINVAL; |
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return -1; |
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#endif
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} |
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int qemu_create_pidfile(const char *filename) |
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{ |
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char buffer[128]; |
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int len;
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#ifndef _WIN32
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int fd;
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fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
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if (fd == -1) |
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return -1; |
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if (lockf(fd, F_TLOCK, 0) == -1) |
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return -1; |
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len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); |
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if (write(fd, buffer, len) != len)
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return -1; |
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#else
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HANDLE file; |
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OVERLAPPED overlap; |
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BOOL ret; |
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memset(&overlap, 0, sizeof(overlap)); |
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file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
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OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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if (file == INVALID_HANDLE_VALUE)
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return -1; |
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len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); |
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ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len, |
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&overlap, NULL);
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if (ret == 0) |
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return -1; |
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#endif
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return 0; |
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} |
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#ifdef _WIN32
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/* mingw32 needs ffs for compilations without optimization. */
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int ffs(int i) |
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{ |
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/* Use gcc's builtin ffs. */
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return __builtin_ffs(i);
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} |
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/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
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#define _W32_FT_OFFSET (116444736000000000ULL) |
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int qemu_gettimeofday(qemu_timeval *tp)
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{ |
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union {
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unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */ |
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FILETIME ft; |
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} _now; |
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if(tp)
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{ |
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GetSystemTimeAsFileTime (&_now.ft); |
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tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL ); |
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tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL); |
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} |
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/* Always return 0 as per Open Group Base Specifications Issue 6.
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Do not set errno on error. */
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return 0; |
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} |
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#endif /* _WIN32 */ |
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/*
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* Opens a file with FD_CLOEXEC set
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*/
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int qemu_open(const char *name, int flags, ...) |
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{ |
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int ret;
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int mode = 0; |
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if (flags & O_CREAT) {
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va_list ap; |
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va_start(ap, flags); |
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mode = va_arg(ap, int);
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va_end(ap); |
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} |
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#ifdef O_CLOEXEC
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ret = open(name, flags | O_CLOEXEC, mode); |
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#else
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ret = open(name, flags, mode); |
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if (ret >= 0) { |
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qemu_set_cloexec(ret); |
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} |
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#endif
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return ret;
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} |
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/*
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* A variant of write(2) which handles partial write.
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*
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* Return the number of bytes transferred.
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* Set errno if fewer than `count' bytes are written.
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*
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* This function don't work with non-blocking fd's.
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* Any of the possibilities with non-bloking fd's is bad:
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* - return a short write (then name is wrong)
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* - busy wait adding (errno == EAGAIN) to the loop
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*/
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ssize_t qemu_write_full(int fd, const void *buf, size_t count) |
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{ |
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ssize_t ret = 0;
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ssize_t total = 0;
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while (count) {
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ret = write(fd, buf, count); |
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if (ret < 0) { |
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if (errno == EINTR)
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continue;
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break;
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} |
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count -= ret; |
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buf += ret; |
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total += ret; |
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} |
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return total;
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} |
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#ifndef _WIN32
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/*
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* Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set.
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*/
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int qemu_eventfd(int fds[2]) |
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{ |
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#ifdef CONFIG_EVENTFD
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int ret;
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ret = eventfd(0, 0); |
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if (ret >= 0) { |
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fds[0] = ret;
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qemu_set_cloexec(ret); |
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if ((fds[1] = dup(ret)) == -1) { |
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close(ret); |
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return -1; |
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} |
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qemu_set_cloexec(fds[1]);
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return 0; |
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} |
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if (errno != ENOSYS) {
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return -1; |
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} |
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#endif
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return qemu_pipe(fds);
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} |
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#endif
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/*
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* Opens a socket with FD_CLOEXEC set
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*/
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int qemu_socket(int domain, int type, int protocol) |
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{ |
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int ret;
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#ifdef SOCK_CLOEXEC
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ret = socket(domain, type | SOCK_CLOEXEC, protocol); |
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if (ret != -1 || errno != EINVAL) { |
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return ret;
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} |
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#endif
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ret = socket(domain, type, protocol); |
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if (ret >= 0) { |
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qemu_set_cloexec(ret); |
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} |
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return ret;
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} |
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/*
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* Accept a connection and set FD_CLOEXEC
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*/
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int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) |
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{ |
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int ret;
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#ifdef CONFIG_ACCEPT4
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ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); |
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if (ret != -1 || errno != ENOSYS) { |
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return ret;
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} |
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#endif
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ret = accept(s, addr, addrlen); |
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if (ret >= 0) { |
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qemu_set_cloexec(ret); |
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} |
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return ret;
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} |