We abort() on memory allocation failure. abort() is appropriate for programming errors. Maybe most memory allocation failures are programming errors, maybe not. But guest memory allocation failure isn't, and aborting when the user asks for more memory than we can provide is not nice. exit(1) instead, and do it in just one place, so the error message is consistent. Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Andreas Färber <afaerber@suse.de> Acked-by: Laszlo Ersek <lersek@redhat.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Message-id: 1375276272-15988-8-git-send-email-armbru@redhat.com Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>
242 lines
6.2 KiB
C
242 lines
6.2 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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/* The following block of code temporarily renames the daemon() function so the
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compiler does not see the warning associated with it in stdlib.h on OSX */
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#ifdef __APPLE__
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#define daemon qemu_fake_daemon_function
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#include <stdlib.h>
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#undef daemon
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extern int daemon(int, int);
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#endif
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#if defined(__linux__) && (defined(__x86_64__) || defined(__arm__))
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/* Use 2 MiB alignment so transparent hugepages can be used by KVM.
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Valgrind does not support alignments larger than 1 MiB,
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therefore we need special code which handles running on Valgrind. */
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# define QEMU_VMALLOC_ALIGN (512 * 4096)
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#elif defined(__linux__) && defined(__s390x__)
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/* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
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# define QEMU_VMALLOC_ALIGN (256 * 4096)
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#else
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# define QEMU_VMALLOC_ALIGN getpagesize()
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#endif
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#include <glib/gprintf.h>
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#include "config-host.h"
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#include "sysemu/sysemu.h"
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#include "trace.h"
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#include "qemu/sockets.h"
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#include <sys/mman.h>
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#ifdef CONFIG_LINUX
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#include <sys/syscall.h>
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#endif
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int qemu_get_thread_id(void)
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{
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#if defined(__linux__)
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return syscall(SYS_gettid);
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#else
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return getpid();
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#endif
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}
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int qemu_daemon(int nochdir, int noclose)
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{
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return daemon(nochdir, noclose);
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}
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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_anon_ram_alloc(size_t size)
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{
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size_t align = QEMU_VMALLOC_ALIGN;
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size_t total = size + align - getpagesize();
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void *ptr = mmap(0, total, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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size_t offset = QEMU_ALIGN_UP((uintptr_t)ptr, align) - (uintptr_t)ptr;
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if (ptr == MAP_FAILED) {
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return NULL;
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}
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ptr += offset;
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total -= offset;
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if (offset > 0) {
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munmap(ptr - offset, offset);
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}
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if (total > size) {
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munmap(ptr + size, total - size);
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}
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trace_qemu_anon_ram_alloc(size, ptr);
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return ptr;
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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 qemu_anon_ram_free(void *ptr, size_t size)
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{
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trace_qemu_anon_ram_free(ptr, size);
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if (ptr) {
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munmap(ptr, size);
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}
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}
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void qemu_set_block(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_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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int qemu_utimens(const char *path, const struct timespec *times)
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{
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struct timeval tv[2], tv_now;
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struct stat st;
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int i;
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#ifdef CONFIG_UTIMENSAT
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int ret;
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ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW);
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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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/* Fallback: use utimes() instead of utimensat() */
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/* happy if special cases */
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if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
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return 0;
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}
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if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
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return utimes(path, NULL);
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}
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/* prepare for hard cases */
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if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
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gettimeofday(&tv_now, NULL);
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}
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if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
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stat(path, &st);
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}
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for (i = 0; i < 2; i++) {
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if (times[i].tv_nsec == UTIME_NOW) {
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tv[i].tv_sec = tv_now.tv_sec;
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tv[i].tv_usec = tv_now.tv_usec;
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} else if (times[i].tv_nsec == UTIME_OMIT) {
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tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
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tv[i].tv_usec = 0;
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} else {
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tv[i].tv_sec = times[i].tv_sec;
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tv[i].tv_usec = times[i].tv_nsec / 1000;
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}
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}
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return utimes(path, &tv[0]);
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}
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char *
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qemu_get_local_state_pathname(const char *relative_pathname)
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{
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return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR,
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relative_pathname);
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}
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