Archipelago » qemu

/*

 * os-win32.c

 *

 * Copyright (c) 2003-2008 Fabrice Bellard

 * Copyright (c) 2010 Red Hat, Inc.

 *

 * 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 <windows.h>

#include <unistd.h>

#include <fcntl.h>

#include <signal.h>

#include <time.h>

#include <errno.h>

#include <sys/time.h>

#include "config-host.h"

#include "sysemu.h"

#include "qemu-options.h"

/***********************************************************/

/* Functions missing in mingw */

int setenv(const char *name, const char *value, int overwrite)

{

    int result = 0;

    if (overwrite || !getenv(name)) {

        size_t length = strlen(name) + strlen(value) + 2;

        char *string = qemu_malloc(length);

        snprintf(string, length, "%s=%s", name, value);

        result = putenv(string);

    }

    return result;

}

/***********************************************************/

/* Polling handling */

typedef struct PollingEntry {

    PollingFunc *func;

    void *opaque;

    struct PollingEntry *next;

} PollingEntry;

static PollingEntry *first_polling_entry;

int qemu_add_polling_cb(PollingFunc *func, void *opaque)

{

    PollingEntry **ppe, *pe;

    pe = qemu_mallocz(sizeof(PollingEntry));

    pe->func = func;

    pe->opaque = opaque;

    for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next);

    *ppe = pe;

    return 0;

}

void qemu_del_polling_cb(PollingFunc *func, void *opaque)

{

    PollingEntry **ppe, *pe;

    for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) {

        pe = *ppe;

        if (pe->func == func && pe->opaque == opaque) {

            *ppe = pe->next;

            qemu_free(pe);

            break;

        }

    }

}

/***********************************************************/

/* Wait objects support */

typedef struct WaitObjects {

    int num;

    HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];

    WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];

    void *opaque[MAXIMUM_WAIT_OBJECTS + 1];

} WaitObjects;

static WaitObjects wait_objects = {0};

int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)

{

    WaitObjects *w = &wait_objects;

    if (w->num >= MAXIMUM_WAIT_OBJECTS)

        return -1;

    w->events[w->num] = handle;

    w->func[w->num] = func;

    w->opaque[w->num] = opaque;

    w->num++;

    return 0;

}

void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)

{

    int i, found;

    WaitObjects *w = &wait_objects;

    found = 0;

    for (i = 0; i < w->num; i++) {

        if (w->events[i] == handle)

            found = 1;

        if (found) {

            w->events[i] = w->events[i + 1];

            w->func[i] = w->func[i + 1];

            w->opaque[i] = w->opaque[i + 1];

        }

    }

    if (found)

        w->num--;

}

void os_host_main_loop_wait(int *timeout)

{

    int ret, ret2, i;

    PollingEntry *pe;

    /* XXX: need to suppress polling by better using win32 events */

    ret = 0;

    for(pe = first_polling_entry; pe != NULL; pe = pe->next) {

        ret |= pe->func(pe->opaque);

    }

    if (ret == 0) {

        int err;

        WaitObjects *w = &wait_objects;

        qemu_mutex_unlock_iothread();

        ret = WaitForMultipleObjects(w->num, w->events, FALSE, *timeout);

        qemu_mutex_lock_iothread();

        if (WAIT_OBJECT_0 + 0 <= ret && ret <= WAIT_OBJECT_0 + w->num - 1) {

            if (w->func[ret - WAIT_OBJECT_0])

                w->func[ret - WAIT_OBJECT_0](w->opaque[ret - WAIT_OBJECT_0]);

            /* Check for additional signaled events */

            for(i = (ret - WAIT_OBJECT_0 + 1); i < w->num; i++) {

                /* Check if event is signaled */

                ret2 = WaitForSingleObject(w->events[i], 0);

                if(ret2 == WAIT_OBJECT_0) {

                    if (w->func[i])

                        w->func[i](w->opaque[i]);

                } else if (ret2 == WAIT_TIMEOUT) {

                } else {

                    err = GetLastError();

                    fprintf(stderr, "WaitForSingleObject error %d %d\n", i, err);

                }

            }

        } else if (ret == WAIT_TIMEOUT) {

        } else {

            err = GetLastError();

            fprintf(stderr, "WaitForMultipleObjects error %d %d\n", ret, err);

        }

    }

    *timeout = 0;

}

static BOOL WINAPI qemu_ctrl_handler(DWORD type)

{

    exit(STATUS_CONTROL_C_EXIT);

    return TRUE;

}

void os_setup_early_signal_handling(void)

{

    /* Note: cpu_interrupt() is currently not SMP safe, so we force

       QEMU to run on a single CPU */

    HANDLE h;

    DWORD_PTR mask, smask;

    int i;

    SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);

    h = GetCurrentProcess();

    if (GetProcessAffinityMask(h, &mask, &smask)) {

        for(i = 0; i < 32; i++) {

            if (mask & (1 << i))

                break;

        }

        if (i != 32) {

            mask = 1 << i;

            SetProcessAffinityMask(h, mask);

        }

    }

}

/* Look for support files in the same directory as the executable.  */

char *os_find_datadir(const char *argv0)

{

    char *p;

    char buf[MAX_PATH];

    DWORD len;

    len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);

    if (len == 0) {

        return NULL;

    }

    buf[len] = 0;

    p = buf + len - 1;

    while (p != buf && *p != '\\')

        p--;

    *p = 0;

    if (access(buf, R_OK) == 0) {

        return qemu_strdup(buf);

    }

    return NULL;

}

void os_set_line_buffering(void)

{

    setbuf(stdout, NULL);

    setbuf(stderr, NULL);

}

/*

 * Parse OS specific command line options.

 * return 0 if option handled, -1 otherwise

 */

void os_parse_cmd_args(int index, const char *optarg)

{

    return;

}

void os_pidfile_error(void)

{

    fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));

}

int qemu_create_pidfile(const char *filename)

{

    char buffer[128];

    int len;

    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;

    }

    return 0;

}