mirror of https://gitee.com/openkylin/qemu.git
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
|
|
* 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"
|
|
|
|
void *qemu_oom_check(void *ptr)
|
|
{
|
|
if (ptr == NULL) {
|
|
fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
|
|
abort();
|
|
}
|
|
return ptr;
|
|
}
|
|
|
|
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 = qemu_oom_check(valloc(size));
|
|
#else
|
|
ptr = qemu_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;
|
|
}
|