#ifndef QEMU_OSDEP_H
#define QEMU_OSDEP_H
+#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ && defined __linux__
+# define _FORTIFY_SOURCE 2
+#endif
+
#include "config-host.h"
#ifdef NEED_CPU_H
#include CONFIG_TARGET
#ifdef _WIN32
/* as defined in sdkddkver.h */
#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0601 /* Windows 7 API (should be in sync with glib) */
+#define _WIN32_WINNT 0x0602 /* Windows 8 API (should be >= the one from glib) */
#endif
/* reduces the number of implicitly included headers */
#ifndef WIN32_LEAN_AND_MEAN
#define __USE_MINGW_ANSI_STDIO 1
#endif
+/*
+ * We need the FreeBSD "legacy" definitions. Rust needs the FreeBSD 11 system
+ * calls since it doesn't use libc at all, so we have to emulate that despite
+ * FreeBSD 11 being EOL'd.
+ */
+#ifdef __FreeBSD__
+#define _WANT_FREEBSD11_STAT
+#define _WANT_FREEBSD11_STATFS
+#define _WANT_FREEBSD11_DIRENT
+#define _WANT_KERNEL_ERRNO
+#define _WANT_SEMUN
+#endif
+
#include <stdarg.h>
#include <stddef.h>
#include <stdbool.h>
#include "qemu/typedefs.h"
+/**
+ * Mark a function that executes in coroutine context
+ *
+ * Functions that execute in coroutine context cannot be called directly from
+ * normal functions. In the future it would be nice to enable compiler or
+ * static checker support for catching such errors. This annotation might make
+ * it possible and in the meantime it serves as documentation.
+ *
+ * For example:
+ *
+ * static void coroutine_fn foo(void) {
+ * ....
+ * }
+ */
+#ifdef __clang__
+#define coroutine_fn QEMU_ANNOTATE("coroutine_fn")
+#else
+#define coroutine_fn
+#endif
+
+/**
+ * Mark a function that can suspend when executed in coroutine context,
+ * but can handle running in non-coroutine context too.
+ */
+#ifdef __clang__
+#define coroutine_mixed_fn QEMU_ANNOTATE("coroutine_mixed_fn")
+#else
+#define coroutine_mixed_fn
+#endif
+
+/**
+ * Mark a function that should not be called from a coroutine context.
+ * Usually there will be an analogous, coroutine_fn function that should
+ * be used instead.
+ *
+ * When the function is also marked as coroutine_mixed_fn, the function should
+ * only be called if the caller does not know whether it is in coroutine
+ * context.
+ *
+ * Functions that are only no_coroutine_fn, on the other hand, should not
+ * be called from within coroutines at all. This for example includes
+ * functions that block.
+ *
+ * In the future it would be nice to enable compiler or static checker
+ * support for catching such errors. This annotation is the first step
+ * towards this, and in the meantime it serves as documentation.
+ *
+ * For example:
+ *
+ * static void no_coroutine_fn foo(void) {
+ * ....
+ * }
+ */
+#ifdef __clang__
+#define no_coroutine_fn QEMU_ANNOTATE("no_coroutine_fn")
+#else
+#define no_coroutine_fn
+#endif
+
+
/*
* For mingw, as of v6.0.0, the function implementing the assert macro is
* not marked as noreturn, so the compiler cannot delete code following an
* supports QEMU_ERROR, this will be reported at compile time; otherwise
* this will be reported at link time due to the missing symbol.
*/
-extern G_NORETURN
+G_NORETURN
void QEMU_ERROR("code path is reachable")
qemu_build_not_reached_always(void);
#if defined(__OPTIMIZE__) && !defined(__NO_INLINE__)
#define qemu_build_not_reached() g_assert_not_reached()
#endif
+/**
+ * qemu_build_assert()
+ *
+ * The compiler, during optimization, is expected to prove that the
+ * assertion is true.
+ */
+#define qemu_build_assert(test) while (!(test)) qemu_build_not_reached()
+
/*
* According to waitpid man page:
* WCOREDUMP
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
-#ifndef MAP_FIXED_NOREPLACE
-#define MAP_FIXED_NOREPLACE 0
-#endif
#ifndef MAP_NORESERVE
#define MAP_NORESERVE 0
#endif
#define ESHUTDOWN 4099
#endif
-#define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR)
+#define RETRY_ON_EINTR(expr) \
+ (__extension__ \
+ ({ typeof(expr) __result; \
+ do { \
+ __result = (expr); \
+ } while (__result == -1 && errno == EINTR); \
+ __result; }))
/* time_t may be either 32 or 64 bits depending on the host OS, and
* can be either signed or unsigned, so we can't just hardcode a
* determined by the pre-processor instead of the compiler, you'll
* have to open-code it. Sadly, Coverity is severely confused by the
* constant variants, so we have to dumb things down there.
+ *
+ * Preprocessor sorcery ahead: use different identifiers for the local
+ * variables in each expansion, so we can nest macro calls without
+ * shadowing variables.
*/
-#undef MIN
-#define MIN(a, b) \
+#define MIN_INTERNAL(a, b, _a, _b) \
({ \
typeof(1 ? (a) : (b)) _a = (a), _b = (b); \
_a < _b ? _a : _b; \
})
-#undef MAX
-#define MAX(a, b) \
+#undef MIN
+#define MIN(a, b) \
+ MIN_INTERNAL((a), (b), MAKE_IDENTFIER(_a), MAKE_IDENTFIER(_b))
+
+#define MAX_INTERNAL(a, b, _a, _b) \
({ \
typeof(1 ? (a) : (b)) _a = (a), _b = (b); \
_a > _b ? _a : _b; \
})
+#undef MAX
+#define MAX(a, b) \
+ MAX_INTERNAL((a), (b), MAKE_IDENTFIER(_a), MAKE_IDENTFIER(_b))
#ifdef __COVERITY__
# define MIN_CONST(a, b) ((a) < (b) ? (a) : (b))
/*
* Minimum function that returns zero only if both values are zero.
* Intended for use with unsigned values only.
+ *
+ * Preprocessor sorcery ahead: use different identifiers for the local
+ * variables in each expansion, so we can nest macro calls without
+ * shadowing variables.
*/
-#ifndef MIN_NON_ZERO
-#define MIN_NON_ZERO(a, b) \
+#define MIN_NON_ZERO_INTERNAL(a, b, _a, _b) \
({ \
typeof(1 ? (a) : (b)) _a = (a), _b = (b); \
_a == 0 ? _b : (_b == 0 || _b > _a) ? _a : _b; \
})
-#endif
+#define MIN_NON_ZERO(a, b) \
+ MIN_NON_ZERO_INTERNAL((a), (b), MAKE_IDENTFIER(_a), MAKE_IDENTFIER(_b))
/*
* Round number down to multiple. Safe when m is not a power of 2 (see
#define HAVE_CHARDEV_SERIAL 1
#endif
-#if defined(__linux__) || defined(__FreeBSD__) || \
- defined(__FreeBSD_kernel__) || defined(__DragonFly__)
-#define HAVE_CHARDEV_PARPORT 1
-#endif
-
#if defined(__HAIKU__)
#define SIGIO SIGPOLL
#endif
* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for discussion
* about Solaris missing the madvise() prototype.
*/
-extern int madvise(char *, size_t, int);
+int madvise(char *, size_t, int);
#endif
#if defined(CONFIG_LINUX)
void qemu_set_tty_echo(int fd, bool echo);
-void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus,
- Error **errp);
+typedef struct ThreadContext ThreadContext;
+
+/**
+ * qemu_prealloc_mem:
+ * @fd: the fd mapped into the area, -1 for anonymous memory
+ * @area: start address of the are to preallocate
+ * @sz: the size of the area to preallocate
+ * @max_threads: maximum number of threads to use
+ * @errp: returns an error if this function fails
+ *
+ * Preallocate memory (populate/prefault page tables writable) for the virtual
+ * memory area starting at @area with the size of @sz. After a successful call,
+ * each page in the area was faulted in writable at least once, for example,
+ * after allocating file blocks for mapped files.
+ *
+ * Return: true on success, else false setting @errp with error.
+ */
+bool qemu_prealloc_mem(int fd, char *area, size_t sz, int max_threads,
+ ThreadContext *tc, Error **errp);
/**
* qemu_get_pid_name:
*/
char *qemu_get_pid_name(pid_t pid);
-/**
- * qemu_fork:
- *
- * A version of fork that avoids signal handler race
- * conditions that can lead to child process getting
- * signals that are otherwise only expected by the
- * parent. It also resets all signal handlers to the
- * default settings.
- *
- * Returns 0 to child process, pid number to parent
- * or -1 on failure.
- */
-pid_t qemu_fork(Error **errp);
-
/* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
* when intptr_t is 32-bit and we are aligning a long long.
*/
projects / mirror_qemu.git / blobdiff