110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* os-posix-lib.c
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2010 Red Hat, Inc.
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*
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* QEMU library functions on POSIX which are shared between QEMU and
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* the QEMU tools.
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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 "config-host.h"
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#include "sysemu.h"
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#include "trace.h"
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#include "qemu_socket.h"
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void *qemu_oom_check(void *ptr)
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{
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if (ptr == NULL) {
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fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
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abort();
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}
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return ptr;
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}
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void *qemu_memalign(size_t alignment, size_t size)
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{
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void *ptr;
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#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
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int ret;
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ret = posix_memalign(&ptr, alignment, size);
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if (ret != 0) {
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fprintf(stderr, "Failed to allocate %zu B: %s\n",
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size, strerror(ret));
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abort();
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}
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#elif defined(CONFIG_BSD)
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ptr = qemu_oom_check(valloc(size));
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#else
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ptr = qemu_oom_check(memalign(alignment, size));
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#endif
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trace_qemu_memalign(alignment, size, ptr);
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return ptr;
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}
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/* alloc shared memory pages */
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void *qemu_vmalloc(size_t size)
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{
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return qemu_memalign(getpagesize(), size);
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}
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void qemu_vfree(void *ptr)
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{
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trace_qemu_vfree(ptr);
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free(ptr);
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}
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void socket_set_nonblock(int fd)
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{
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int f;
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f = fcntl(fd, F_GETFL);
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fcntl(fd, F_SETFL, f | O_NONBLOCK);
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}
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void qemu_set_cloexec(int fd)
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{
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int f;
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f = fcntl(fd, F_GETFD);
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fcntl(fd, F_SETFD, f | FD_CLOEXEC);
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}
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/*
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* Creates a pipe with FD_CLOEXEC set on both file descriptors
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*/
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int qemu_pipe(int pipefd[2])
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{
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int ret;
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#ifdef CONFIG_PIPE2
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ret = pipe2(pipefd, O_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 = pipe(pipefd);
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if (ret == 0) {
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qemu_set_cloexec(pipefd[0]);
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qemu_set_cloexec(pipefd[1]);
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}
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return ret;
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}
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