Archipelago » qemu

/*

 * os-posix-lib.c

 *

 * Copyright (c) 2003-2008 Fabrice Bellard

 * Copyright (c) 2010 Red Hat, Inc.

 *

 * QEMU library functions on POSIX which are shared between QEMU and

 * the QEMU tools.

 *

 * 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 "config-host.h"

#include "sysemu.h"

#include "trace.h"

#include "qemu_socket.h"

#if !defined(_POSIX_C_SOURCE) || defined(__sun__)

static void *oom_check(void *ptr)

{

    if (ptr == NULL) {

        fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));

        abort();

    }

    return ptr;

}

#endif

void *qemu_memalign(size_t alignment, size_t size)

{

    void *ptr;

#if defined(_POSIX_C_SOURCE) && !defined(__sun__)

    int ret;

    ret = posix_memalign(&ptr, alignment, size);

    if (ret != 0) {

        fprintf(stderr, "Failed to allocate %zu B: %s\n",

                size, strerror(ret));

        abort();

    }

#elif defined(CONFIG_BSD)

    ptr = oom_check(valloc(size));

#else

    ptr = oom_check(memalign(alignment, size));

#endif

    trace_qemu_memalign(alignment, size, ptr);

    return ptr;

}

/* alloc shared memory pages */

void *qemu_vmalloc(size_t size)

{

    return qemu_memalign(getpagesize(), size);

}

void qemu_vfree(void *ptr)

{

    trace_qemu_vfree(ptr);

    free(ptr);

}

void socket_set_nonblock(int fd)

{

    int f;

    f = fcntl(fd, F_GETFL);

    fcntl(fd, F_SETFL, f | O_NONBLOCK);

}

void qemu_set_cloexec(int fd)

{

    int f;

    f = fcntl(fd, F_GETFD);

    fcntl(fd, F_SETFD, f | FD_CLOEXEC);

}

/*

 * Creates a pipe with FD_CLOEXEC set on both file descriptors

 */

int qemu_pipe(int pipefd[2])

{

    int ret;

#ifdef CONFIG_PIPE2

    ret = pipe2(pipefd, O_CLOEXEC);

    if (ret != -1 || errno != ENOSYS) {

        return ret;

    }

#endif

    ret = pipe(pipefd);

    if (ret == 0) {

        qemu_set_cloexec(pipefd[0]);

        qemu_set_cloexec(pipefd[1]);

    }

    return ret;

}