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
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
29 #include "qemu/osdep.h"
32 #include <glib/gprintf.h>
34 #include "sysemu/sysemu.h"
36 #include "qapi/error.h"
37 #include "qemu/sockets.h"
39 #include <sys/signal.h>
40 #include "qemu/cutils.h"
43 #include <sys/syscall.h>
47 #include <sys/sysctl.h>
52 #include "qemu/mmap-alloc.h"
54 #ifdef CONFIG_DEBUG_STACK_USAGE
55 #include "qemu/error-report.h"
59 #include "qemu/error-report.h"
60 #include "../../tizen/src/emulator_common.h"
63 int qemu_get_thread_id(void)
65 #if defined(__linux__)
66 return syscall(SYS_gettid);
72 int qemu_daemon(int nochdir, int noclose)
74 return daemon(nochdir, noclose);
77 void *qemu_oom_check(void *ptr)
81 error_report("Failed to allocate memory: %s", strerror(errno));
83 fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
90 void *qemu_try_memalign(size_t alignment, size_t size)
94 if (alignment < sizeof(void*)) {
95 alignment = sizeof(void*);
98 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
100 ret = posix_memalign(&ptr, alignment, size);
105 #elif defined(CONFIG_BSD)
108 ptr = memalign(alignment, size);
110 trace_qemu_memalign(alignment, size, ptr);
114 void *qemu_memalign(size_t alignment, size_t size)
116 return qemu_oom_check(qemu_try_memalign(alignment, size));
120 void *preallocated_ram_ptr = NULL;
121 int preallocated_ram_size = -1;
124 /* alloc shared memory pages */
125 void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment)
128 if (size == preallocated_ram_size && preallocated_ram_ptr) {
129 void *ptr = preallocated_ram_ptr;
130 preallocated_ram_ptr = NULL;
131 preallocated_ram_size = -1;
135 size_t align = QEMU_VMALLOC_ALIGN;
136 void *ptr = qemu_ram_mmap(-1, size, align, false);
138 if (ptr == MAP_FAILED) {
146 trace_qemu_anon_ram_alloc(size, ptr);
150 void qemu_vfree(void *ptr)
152 trace_qemu_vfree(ptr);
156 void qemu_anon_ram_free(void *ptr, size_t size)
158 trace_qemu_anon_ram_free(ptr, size);
159 qemu_ram_munmap(ptr, size);
162 void qemu_set_block(int fd)
165 f = fcntl(fd, F_GETFL);
166 fcntl(fd, F_SETFL, f & ~O_NONBLOCK);
169 void qemu_set_nonblock(int fd)
172 f = fcntl(fd, F_GETFL);
173 fcntl(fd, F_SETFL, f | O_NONBLOCK);
176 int socket_set_fast_reuse(int fd)
180 ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
181 (const char *)&val, sizeof(val));
188 void qemu_set_cloexec(int fd)
191 f = fcntl(fd, F_GETFD);
192 fcntl(fd, F_SETFD, f | FD_CLOEXEC);
196 * Creates a pipe with FD_CLOEXEC set on both file descriptors
198 int qemu_pipe(int pipefd[2])
203 ret = pipe2(pipefd, O_CLOEXEC);
204 if (ret != -1 || errno != ENOSYS) {
210 qemu_set_cloexec(pipefd[0]);
211 qemu_set_cloexec(pipefd[1]);
217 int qemu_utimens(const char *path, const struct timespec *times)
219 struct timeval tv[2], tv_now;
222 #ifdef CONFIG_UTIMENSAT
225 ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW);
226 if (ret != -1 || errno != ENOSYS) {
230 /* Fallback: use utimes() instead of utimensat() */
232 /* happy if special cases */
233 if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
236 if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
237 return utimes(path, NULL);
240 /* prepare for hard cases */
241 if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
242 gettimeofday(&tv_now, NULL);
244 if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
248 for (i = 0; i < 2; i++) {
249 if (times[i].tv_nsec == UTIME_NOW) {
250 tv[i].tv_sec = tv_now.tv_sec;
251 tv[i].tv_usec = tv_now.tv_usec;
252 } else if (times[i].tv_nsec == UTIME_OMIT) {
253 tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
256 tv[i].tv_sec = times[i].tv_sec;
257 tv[i].tv_usec = times[i].tv_nsec / 1000;
261 return utimes(path, &tv[0]);
265 qemu_get_local_state_pathname(const char *relative_pathname)
267 return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR,
271 void qemu_set_tty_echo(int fd, bool echo)
278 tty.c_lflag |= ECHO | ECHONL | ICANON | IEXTEN;
280 tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN);
283 tcsetattr(fd, TCSANOW, &tty);
286 static char exec_dir[PATH_MAX];
288 void qemu_init_exec_dir(const char *argv0)
294 assert(!exec_dir[0]);
296 #if defined(__linux__)
299 len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
305 #elif defined(__FreeBSD__)
307 static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
308 size_t len = sizeof(buf) - 1;
311 if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) &&
313 buf[sizeof(buf) - 1] = '\0';
318 /* If we don't have any way of figuring out the actual executable
319 location then try argv[0]. */
324 p = realpath(argv0, buf);
329 dir = g_path_get_dirname(p);
331 pstrcpy(exec_dir, sizeof(exec_dir), dir);
336 char *qemu_get_exec_dir(void)
338 return g_strdup(exec_dir);
341 static sigjmp_buf sigjump;
343 static void sigbus_handler(int signal)
345 siglongjmp(sigjump, 1);
348 void os_mem_prealloc(int fd, char *area, size_t memory, Error **errp)
351 struct sigaction act, oldact;
352 sigset_t set, oldset;
354 memset(&act, 0, sizeof(act));
355 act.sa_handler = &sigbus_handler;
358 ret = sigaction(SIGBUS, &act, &oldact);
360 error_setg_errno(errp, errno,
361 "os_mem_prealloc: failed to install signal handler");
367 sigaddset(&set, SIGBUS);
368 pthread_sigmask(SIG_UNBLOCK, &set, &oldset);
370 if (sigsetjmp(sigjump, 1)) {
371 error_setg(errp, "os_mem_prealloc: Insufficient free host memory "
372 "pages available to allocate guest RAM\n");
375 size_t hpagesize = qemu_fd_getpagesize(fd);
376 size_t numpages = DIV_ROUND_UP(memory, hpagesize);
378 /* MAP_POPULATE silently ignores failures */
379 for (i = 0; i < numpages; i++) {
380 memset(area + (hpagesize * i), 0, 1);
384 ret = sigaction(SIGBUS, &oldact, NULL);
386 /* Terminate QEMU since it can't recover from error */
387 perror("os_mem_prealloc: failed to reinstall signal handler");
390 pthread_sigmask(SIG_SETMASK, &oldset, NULL);
394 static struct termios oldtty;
396 static void term_exit(void)
398 tcsetattr(0, TCSANOW, &oldtty);
401 static void term_init(void)
408 tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
409 |INLCR|IGNCR|ICRNL|IXON);
410 tty.c_oflag |= OPOST;
411 tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
412 tty.c_cflag &= ~(CSIZE|PARENB);
417 tcsetattr(0, TCSANOW, &tty);
422 int qemu_read_password(char *buf, int buf_size)
427 printf("password: ");
432 ret = read(0, &ch, 1);
434 if (errno == EAGAIN || errno == EINTR) {
439 } else if (ret == 0) {
448 if (i < (buf_size - 1)) {
460 char *qemu_get_pid_name(pid_t pid)
464 #if defined(__FreeBSD__)
465 /* BSDs don't have /proc, but they provide a nice substitute */
466 struct kinfo_proc *proc = kinfo_getproc(pid);
469 name = g_strdup(proc->ki_comm);
473 /* Assume a system with reasonable procfs */
477 pid_path = g_strdup_printf("/proc/%d/cmdline", pid);
478 g_file_get_contents(pid_path, &name, &len, NULL);
486 pid_t qemu_fork(Error **errp)
488 sigset_t oldmask, newmask;
489 struct sigaction sig_action;
494 * Need to block signals now, so that child process can safely
495 * kill off caller's signal handlers without a race.
497 sigfillset(&newmask);
498 if (pthread_sigmask(SIG_SETMASK, &newmask, &oldmask) != 0) {
499 error_setg_errno(errp, errno,
500 "cannot block signals");
508 /* attempt to restore signal mask, but ignore failure, to
509 * avoid obscuring the fork failure */
510 (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL);
511 error_setg_errno(errp, saved_errno,
512 "cannot fork child process");
518 /* Restore our original signal mask now that the child is
519 * safely running. Only documented failures are EFAULT (not
520 * possible, since we are using just-grabbed mask) or EINVAL
521 * (not possible, since we are using correct arguments). */
522 (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL);
527 /* Clear out all signal handlers from parent so nothing
528 * unexpected can happen in our child once we unblock
530 sig_action.sa_handler = SIG_DFL;
531 sig_action.sa_flags = 0;
532 sigemptyset(&sig_action.sa_mask);
534 for (i = 1; i < NSIG; i++) {
535 /* Only possible errors are EFAULT or EINVAL The former
536 * won't happen, the latter we expect, so no need to check
538 (void)sigaction(i, &sig_action, NULL);
541 /* Unmask all signals in child, since we've no idea what the
542 * caller's done with their signal mask and don't want to
543 * propagate that to children */
544 sigemptyset(&newmask);
545 if (pthread_sigmask(SIG_SETMASK, &newmask, NULL) != 0) {
546 Error *local_err = NULL;
547 error_setg_errno(&local_err, errno,
548 "cannot unblock signals");
549 error_report_err(local_err);
556 void *qemu_alloc_stack(size_t *sz)
558 void *ptr, *guardpage;
559 #ifdef CONFIG_DEBUG_STACK_USAGE
562 size_t pagesz = getpagesize();
563 #ifdef _SC_THREAD_STACK_MIN
564 /* avoid stacks smaller than _SC_THREAD_STACK_MIN */
565 long min_stack_sz = sysconf(_SC_THREAD_STACK_MIN);
566 *sz = MAX(MAX(min_stack_sz, 0), *sz);
568 /* adjust stack size to a multiple of the page size */
569 *sz = ROUND_UP(*sz, pagesz);
570 /* allocate one extra page for the guard page */
573 ptr = mmap(NULL, *sz, PROT_READ | PROT_WRITE,
574 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
575 if (ptr == MAP_FAILED) {
579 #if defined(HOST_IA64)
580 /* separate register stack */
581 guardpage = ptr + (((*sz - pagesz) / 2) & ~pagesz);
582 #elif defined(HOST_HPPA)
584 guardpage = ptr + *sz - pagesz;
586 /* stack grows down */
589 if (mprotect(guardpage, pagesz, PROT_NONE) != 0) {
593 #ifdef CONFIG_DEBUG_STACK_USAGE
594 for (ptr2 = ptr + pagesz; ptr2 < ptr + *sz; ptr2 += sizeof(uint32_t)) {
595 *(uint32_t *)ptr2 = 0xdeadbeaf;
602 #ifdef CONFIG_DEBUG_STACK_USAGE
603 static __thread unsigned int max_stack_usage;
606 void qemu_free_stack(void *stack, size_t sz)
608 #ifdef CONFIG_DEBUG_STACK_USAGE
612 for (ptr = stack + getpagesize(); ptr < stack + sz;
613 ptr += sizeof(uint32_t)) {
614 if (*(uint32_t *)ptr != 0xdeadbeaf) {
618 usage = sz - (uintptr_t) (ptr - stack);
619 if (usage > max_stack_usage) {
620 error_report("thread %d max stack usage increased from %u to %u",
621 qemu_get_thread_id(), max_stack_usage, usage);
622 max_stack_usage = usage;