virtio: fix up VQ checks
[qemu.git] / oslib-posix.c
blob6e9b0c3c13c64ecae029da5bda1a1650fbb3a84a
1 /*
2 * os-posix-lib.c
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2010 Red Hat, Inc.
7 * QEMU library functions on POSIX which are shared between QEMU and
8 * the QEMU tools.
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 * THE SOFTWARE.
29 #include "config-host.h"
30 #include "sysemu.h"
31 #include "trace.h"
32 #include "qemu_socket.h"
34 void *qemu_oom_check(void *ptr)
36 if (ptr == NULL) {
37 fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
38 abort();
40 return ptr;
43 void *qemu_memalign(size_t alignment, size_t size)
45 void *ptr;
46 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
47 int ret;
48 ret = posix_memalign(&ptr, alignment, size);
49 if (ret != 0) {
50 fprintf(stderr, "Failed to allocate %zu B: %s\n",
51 size, strerror(ret));
52 abort();
54 #elif defined(CONFIG_BSD)
55 ptr = qemu_oom_check(valloc(size));
56 #else
57 ptr = qemu_oom_check(memalign(alignment, size));
58 #endif
59 trace_qemu_memalign(alignment, size, ptr);
60 return ptr;
63 /* alloc shared memory pages */
64 void *qemu_vmalloc(size_t size)
66 return qemu_memalign(getpagesize(), size);
69 void qemu_vfree(void *ptr)
71 trace_qemu_vfree(ptr);
72 free(ptr);
75 void socket_set_nonblock(int fd)
77 int f;
78 f = fcntl(fd, F_GETFL);
79 fcntl(fd, F_SETFL, f | O_NONBLOCK);
82 void qemu_set_cloexec(int fd)
84 int f;
85 f = fcntl(fd, F_GETFD);
86 fcntl(fd, F_SETFD, f | FD_CLOEXEC);
90 * Creates a pipe with FD_CLOEXEC set on both file descriptors
92 int qemu_pipe(int pipefd[2])
94 int ret;
96 #ifdef CONFIG_PIPE2
97 ret = pipe2(pipefd, O_CLOEXEC);
98 if (ret != -1 || errno != ENOSYS) {
99 return ret;
101 #endif
102 ret = pipe(pipefd);
103 if (ret == 0) {
104 qemu_set_cloexec(pipefd[0]);
105 qemu_set_cloexec(pipefd[1]);
108 return ret;