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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 _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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/*
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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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}