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git.proxmox.com Git - mirror_qemu.git/blob - util/osdep.c
2 * QEMU low level functions
4 * Copyright (c) 2003 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 #include "qemu/osdep.h"
25 #include "qapi/error.h"
27 /* Needed early for CONFIG_BSD etc. */
30 #include <sys/statvfs.h>
31 /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for
32 discussion about Solaris header problems */
33 extern int madvise(char *, size_t, int);
36 #include "qemu-common.h"
37 #include "qemu/cutils.h"
38 #include "qemu/sockets.h"
39 #include "qemu/error-report.h"
40 #include "monitor/monitor.h"
42 static bool fips_enabled
= false;
44 static const char *hw_version
= QEMU_HW_VERSION
;
46 int socket_set_cork(int fd
, int v
)
48 #if defined(SOL_TCP) && defined(TCP_CORK)
49 return qemu_setsockopt(fd
, SOL_TCP
, TCP_CORK
, &v
, sizeof(v
));
55 int socket_set_nodelay(int fd
)
58 return qemu_setsockopt(fd
, IPPROTO_TCP
, TCP_NODELAY
, &v
, sizeof(v
));
61 int qemu_madvise(void *addr
, size_t len
, int advice
)
63 if (advice
== QEMU_MADV_INVALID
) {
67 #if defined(CONFIG_MADVISE)
68 return madvise(addr
, len
, advice
);
69 #elif defined(CONFIG_POSIX_MADVISE)
70 return posix_madvise(addr
, len
, advice
);
77 static int qemu_mprotect__osdep(void *addr
, size_t size
, int prot
)
79 g_assert(!((uintptr_t)addr
& ~qemu_real_host_page_mask
));
80 g_assert(!(size
& ~qemu_real_host_page_mask
));
85 if (!VirtualProtect(addr
, size
, prot
, &old_protect
)) {
86 g_autofree gchar
*emsg
= g_win32_error_message(GetLastError());
87 error_report("%s: VirtualProtect failed: %s", __func__
, emsg
);
92 if (mprotect(addr
, size
, prot
)) {
93 error_report("%s: mprotect failed: %s", __func__
, strerror(errno
));
100 int qemu_mprotect_rwx(void *addr
, size_t size
)
103 return qemu_mprotect__osdep(addr
, size
, PAGE_EXECUTE_READWRITE
);
105 return qemu_mprotect__osdep(addr
, size
, PROT_READ
| PROT_WRITE
| PROT_EXEC
);
109 int qemu_mprotect_none(void *addr
, size_t size
)
112 return qemu_mprotect__osdep(addr
, size
, PAGE_NOACCESS
);
114 return qemu_mprotect__osdep(addr
, size
, PROT_NONE
);
120 static int fcntl_op_setlk
= -1;
121 static int fcntl_op_getlk
= -1;
124 * Dups an fd and sets the flags
126 int qemu_dup_flags(int fd
, int flags
)
137 dup_flags
= fcntl(ret
, F_GETFL
);
138 if (dup_flags
== -1) {
142 if ((flags
& O_SYNC
) != (dup_flags
& O_SYNC
)) {
147 /* Set/unset flags that we can with fcntl */
148 if (fcntl(ret
, F_SETFL
, flags
) == -1) {
152 /* Truncate the file in the cases that open() would truncate it */
153 if (flags
& O_TRUNC
||
154 ((flags
& (O_CREAT
| O_EXCL
)) == (O_CREAT
| O_EXCL
))) {
155 if (ftruncate(ret
, 0) == -1) {
174 #ifdef F_DUPFD_CLOEXEC
175 ret
= fcntl(fd
, F_DUPFD_CLOEXEC
, 0);
179 qemu_set_cloexec(ret
);
185 static int qemu_parse_fdset(const char *param
)
187 return qemu_parse_fd(param
);
190 static void qemu_probe_lock_ops(void)
192 if (fcntl_op_setlk
== -1) {
197 .l_whence
= SEEK_SET
,
203 fd
= open("/dev/null", O_RDWR
);
206 "Failed to open /dev/null for OFD lock probing: %s\n",
208 fcntl_op_setlk
= F_SETLK
;
209 fcntl_op_getlk
= F_GETLK
;
212 ret
= fcntl(fd
, F_OFD_GETLK
, &fl
);
215 fcntl_op_setlk
= F_OFD_SETLK
;
216 fcntl_op_getlk
= F_OFD_GETLK
;
218 fcntl_op_setlk
= F_SETLK
;
219 fcntl_op_getlk
= F_GETLK
;
222 fcntl_op_setlk
= F_SETLK
;
223 fcntl_op_getlk
= F_GETLK
;
228 bool qemu_has_ofd_lock(void)
230 qemu_probe_lock_ops();
232 return fcntl_op_setlk
== F_OFD_SETLK
;
238 static int qemu_lock_fcntl(int fd
, int64_t start
, int64_t len
, int fl_type
)
242 .l_whence
= SEEK_SET
,
247 qemu_probe_lock_ops();
249 ret
= fcntl(fd
, fcntl_op_setlk
, &fl
);
250 } while (ret
== -1 && errno
== EINTR
);
251 return ret
== -1 ? -errno
: 0;
254 int qemu_lock_fd(int fd
, int64_t start
, int64_t len
, bool exclusive
)
256 return qemu_lock_fcntl(fd
, start
, len
, exclusive
? F_WRLCK
: F_RDLCK
);
259 int qemu_unlock_fd(int fd
, int64_t start
, int64_t len
)
261 return qemu_lock_fcntl(fd
, start
, len
, F_UNLCK
);
264 int qemu_lock_fd_test(int fd
, int64_t start
, int64_t len
, bool exclusive
)
268 .l_whence
= SEEK_SET
,
271 .l_type
= exclusive
? F_WRLCK
: F_RDLCK
,
273 qemu_probe_lock_ops();
274 ret
= fcntl(fd
, fcntl_op_getlk
, &fl
);
278 return fl
.l_type
== F_UNLCK
? 0 : -EAGAIN
;
283 static int qemu_open_cloexec(const char *name
, int flags
, mode_t mode
)
287 ret
= open(name
, flags
| O_CLOEXEC
, mode
);
289 ret
= open(name
, flags
, mode
);
291 qemu_set_cloexec(ret
);
298 * Opens a file with FD_CLOEXEC set
301 qemu_open_internal(const char *name
, int flags
, mode_t mode
, Error
**errp
)
306 const char *fdset_id_str
;
308 /* Attempt dup of fd from fd set */
309 if (strstart(name
, "/dev/fdset/", &fdset_id_str
)) {
313 fdset_id
= qemu_parse_fdset(fdset_id_str
);
314 if (fdset_id
== -1) {
315 error_setg(errp
, "Could not parse fdset %s", name
);
320 dupfd
= monitor_fdset_dup_fd_add(fdset_id
, flags
);
322 error_setg_errno(errp
, errno
, "Could not dup FD for %s flags %x",
331 ret
= qemu_open_cloexec(name
, flags
, mode
);
334 const char *action
= flags
& O_CREAT
? "create" : "open";
335 error_setg_errno(errp
, errno
, "Could not %s '%s'",
344 int qemu_open(const char *name
, int flags
, Error
**errp
)
346 assert(!(flags
& O_CREAT
));
348 return qemu_open_internal(name
, flags
, 0, errp
);
352 int qemu_create(const char *name
, int flags
, mode_t mode
, Error
**errp
)
354 assert(!(flags
& O_CREAT
));
356 return qemu_open_internal(name
, flags
| O_CREAT
, mode
, errp
);
360 int qemu_open_old(const char *name
, int flags
, ...)
367 if (flags
& O_CREAT
) {
368 mode
= va_arg(ap
, int);
372 ret
= qemu_open_internal(name
, flags
, mode
, NULL
);
375 if (ret
== -1 && errno
== EINVAL
&& (flags
& O_DIRECT
)) {
376 error_report("file system may not support O_DIRECT");
377 errno
= EINVAL
; /* in case it was clobbered */
379 #endif /* O_DIRECT */
384 int qemu_close(int fd
)
388 /* Close fd that was dup'd from an fdset */
389 fdset_id
= monitor_fdset_dup_fd_find(fd
);
390 if (fdset_id
!= -1) {
395 monitor_fdset_dup_fd_remove(fd
);
405 * Delete a file from the filesystem, unless the filename is /dev/fdset/...
407 * Returns: On success, zero is returned. On error, -1 is returned,
408 * and errno is set appropriately.
410 int qemu_unlink(const char *name
)
412 if (g_str_has_prefix(name
, "/dev/fdset/")) {
420 * A variant of write(2) which handles partial write.
422 * Return the number of bytes transferred.
423 * Set errno if fewer than `count' bytes are written.
425 * This function don't work with non-blocking fd's.
426 * Any of the possibilities with non-bloking fd's is bad:
427 * - return a short write (then name is wrong)
428 * - busy wait adding (errno == EAGAIN) to the loop
430 ssize_t
qemu_write_full(int fd
, const void *buf
, size_t count
)
436 ret
= write(fd
, buf
, count
);
452 * Opens a socket with FD_CLOEXEC set
454 int qemu_socket(int domain
, int type
, int protocol
)
459 ret
= socket(domain
, type
| SOCK_CLOEXEC
, protocol
);
460 if (ret
!= -1 || errno
!= EINVAL
) {
464 ret
= socket(domain
, type
, protocol
);
466 qemu_set_cloexec(ret
);
473 * Accept a connection and set FD_CLOEXEC
475 int qemu_accept(int s
, struct sockaddr
*addr
, socklen_t
*addrlen
)
479 #ifdef CONFIG_ACCEPT4
480 ret
= accept4(s
, addr
, addrlen
, SOCK_CLOEXEC
);
481 if (ret
!= -1 || errno
!= ENOSYS
) {
485 ret
= accept(s
, addr
, addrlen
);
487 qemu_set_cloexec(ret
);
493 void qemu_set_hw_version(const char *version
)
495 hw_version
= version
;
498 const char *qemu_hw_version(void)
503 void fips_set_state(bool requested
)
507 FILE *fds
= fopen("/proc/sys/crypto/fips_enabled", "r");
509 fips_enabled
= (fgetc(fds
) == '1');
514 fips_enabled
= false;
515 #endif /* __linux__ */
518 fprintf(stderr
, "FIPS mode %s (requested %s)\n",
519 (fips_enabled
? "enabled" : "disabled"),
520 (requested
? "enabled" : "disabled"));
524 bool fips_get_state(void)
530 static void socket_cleanup(void)
536 int socket_init(void)
542 ret
= WSAStartup(MAKEWORD(2, 2), &Data
);
544 err
= WSAGetLastError();
545 fprintf(stderr
, "WSAStartup: %d\n", err
);
548 atexit(socket_cleanup
);
555 /* helper function for iov_send_recv() */
557 readv_writev(int fd
, const struct iovec
*iov
, int iov_cnt
, bool do_write
)
561 while (i
< iov_cnt
) {
563 ? write(fd
, iov
[i
].iov_base
, iov
[i
].iov_len
)
564 : read(fd
, iov
[i
].iov_base
, iov
[i
].iov_len
);
569 } else if (errno
== EINTR
) {
572 /* else it is some "other" error,
573 * only return if there was no data processed. */
585 readv(int fd
, const struct iovec
*iov
, int iov_cnt
)
587 return readv_writev(fd
, iov
, iov_cnt
, false);
591 writev(int fd
, const struct iovec
*iov
, int iov_cnt
)
593 return readv_writev(fd
, iov
, iov_cnt
, true);