x86: split off exception handlers

[qemu.git] / osdep.c

diff --git a/osdep.c b/osdep.c
index 91fb39efaaf4ee7fe614bd3785d380ca3da37173..03817f0f3aaf2752849635b039f0ac1cbd947a48 100644 (file)
--- a/osdep.c
+++ b/osdep.c
@@ -28,285 +28,228 @@
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>

-#ifdef HOST_SOLARIS
-#include <sys/types.h>
-#include <sys/statvfs.h>
-#endif

 
 

-/* Needed early for HOST_BSD etc. */
+/* Needed early for CONFIG_BSD etc. */

 #include "config-host.h"
 
 #include "config-host.h"
 

-#ifdef _WIN32
-#include <windows.h>
-#elif defined(HOST_BSD)
-#include <stdlib.h>
-#else
-#include <malloc.h>
+#if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE)
+#include <sys/mman.h>
+#endif
+
+#ifdef CONFIG_SOLARIS
+#include <sys/types.h>
+#include <sys/statvfs.h>
+/* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for
+   discussion about Solaris header problems */
+extern int madvise(caddr_t, size_t, int);

 #endif
 
 #include "qemu-common.h"
 #endif
 
 #include "qemu-common.h"

-#include "sysemu.h"
+#include "trace.h"

 #include "qemu_socket.h"
 
 #include "qemu_socket.h"
 

-#if defined(_WIN32)
-void *qemu_memalign(size_t alignment, size_t size)
+static const char *qemu_version = QEMU_VERSION;
+
+int socket_set_cork(int fd, int v)

 {
 {

-    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
+#if defined(SOL_TCP) && defined(TCP_CORK)
+    return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
+#else
+    return 0;
+#endif

 }
 
 }
 

-void *qemu_vmalloc(size_t size)
+int qemu_madvise(void *addr, size_t len, int advice)

 {
 {

-    /* FIXME: this is not exactly optimal solution since VirtualAlloc
-       has 64Kb granularity, but at least it guarantees us that the
-       memory is page aligned. */
-    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
+    if (advice == QEMU_MADV_INVALID) {
+        errno = EINVAL;
+        return -1;
+    }
+#if defined(CONFIG_MADVISE)
+    return madvise(addr, len, advice);
+#elif defined(CONFIG_POSIX_MADVISE)
+    return posix_madvise(addr, len, advice);
+#else
+    errno = EINVAL;
+    return -1;
+#endif

 }
 
 }
 

-void qemu_vfree(void *ptr)
+
+/*
+ * Opens a file with FD_CLOEXEC set
+ */
+int qemu_open(const char *name, int flags, ...)

 {
 {

-    VirtualFree(ptr, 0, MEM_RELEASE);
-}
+    int ret;
+    int mode = 0;

 
 

-#else
+    if (flags & O_CREAT) {
+        va_list ap;

 
 

-#if defined(USE_KQEMU)
+        va_start(ap, flags);
+        mode = va_arg(ap, int);
+        va_end(ap);
+    }

 
 

-#ifdef __OpenBSD__
-#include <sys/param.h>
-#include <sys/types.h>
-#include <sys/mount.h>
+#ifdef O_CLOEXEC
+    ret = open(name, flags | O_CLOEXEC, mode);

 #else
 #else

-#ifndef __FreeBSD__
-#include <sys/vfs.h>
-#endif
+    ret = open(name, flags, mode);
+    if (ret >= 0) {
+        qemu_set_cloexec(ret);
+    }

 #endif
 
 #endif
 

-#include <sys/mman.h>
-#include <fcntl.h>
+    return ret;
+}

 
 

-static void *kqemu_vmalloc(size_t size)
+/*
+ * A variant of write(2) which handles partial write.
+ *
+ * Return the number of bytes transferred.
+ * Set errno if fewer than `count' bytes are written.
+ *
+ * This function don't work with non-blocking fd's.
+ * Any of the possibilities with non-bloking fd's is bad:
+ *   - return a short write (then name is wrong)
+ *   - busy wait adding (errno == EAGAIN) to the loop
+ */
+ssize_t qemu_write_full(int fd, const void *buf, size_t count)

 {
 {

-    static int phys_ram_fd = -1;
-    static int phys_ram_size = 0;
-    void *ptr;
-
-/* no need (?) for a dummy file on OpenBSD/FreeBSD */
-#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
-    int map_anon = MAP_ANON;
-#else
-    int map_anon = 0;
-    const char *tmpdir;
-    char phys_ram_file[1024];
-#ifdef HOST_SOLARIS
-    struct statvfs stfs;
-#else
-    struct statfs stfs;
-#endif
-
-    if (phys_ram_fd < 0) {
-        tmpdir = getenv("QEMU_TMPDIR");
-        if (!tmpdir)
-#ifdef HOST_SOLARIS
-            tmpdir = "/tmp";
-        if (statvfs(tmpdir, &stfs) == 0) {
-#else
-            tmpdir = "/dev/shm";
-        if (statfs(tmpdir, &stfs) == 0) {
-#endif
-            int64_t free_space;
-            int ram_mb;
-
-            free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
-            if ((ram_size + 8192 * 1024) >= free_space) {
-                ram_mb = (ram_size / (1024 * 1024));
-                fprintf(stderr,
-                        "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
-                        tmpdir, ram_mb);
-                if (strcmp(tmpdir, "/dev/shm") == 0) {
-                    fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
-                            "mount -o remount,size=%dm /dev/shm\n",
-                            ram_mb + 16);
-                } else {
-                    fprintf(stderr,
-                            "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
-                            "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
-                            "temporary RAM file will be opened.\n");
-                }
-                fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
-                exit(1);
-            }
+    ssize_t ret = 0;
+    ssize_t total = 0;
+
+    while (count) {
+        ret = write(fd, buf, count);
+        if (ret < 0) {
+            if (errno == EINTR)
+                continue;
+            break;

         }
         }

-        snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
-                 tmpdir);
-        phys_ram_fd = mkstemp(phys_ram_file);
-        if (phys_ram_fd < 0) {
-            fprintf(stderr,
-                    "warning: could not create temporary file in '%s'.\n"
-                    "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
-                    "Using '/tmp' as fallback.\n",
-                    tmpdir);
-            snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
-                     "/tmp");
-            phys_ram_fd = mkstemp(phys_ram_file);
-            if (phys_ram_fd < 0) {
-                fprintf(stderr, "Could not create temporary memory file '%s'\n",
-                        phys_ram_file);
-                exit(1);
-            }
-        }
-        unlink(phys_ram_file);
-    }
-    size = (size + 4095) & ~4095;
-    ftruncate(phys_ram_fd, phys_ram_size + size);
-#endif /* !(__OpenBSD__ || __FreeBSD__ || __DragonFly__) */
-    ptr = mmap(NULL,
-               size,
-               PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
-               phys_ram_fd, phys_ram_size);
-    if (ptr == MAP_FAILED) {
-        fprintf(stderr, "Could not map physical memory\n");
-        exit(1);
+
+        count -= ret;
+        buf += ret;
+        total += ret;

     }
     }

-    phys_ram_size += size;
-    return ptr;
-}

 
 

-static void kqemu_vfree(void *ptr)
-{
-    /* may be useful some day, but currently we do not need to free */
+    return total;

 }
 
 }
 

-#endif
-
-void *qemu_memalign(size_t alignment, size_t size)
+/*
+ * Opens a socket with FD_CLOEXEC set
+ */
+int qemu_socket(int domain, int type, int protocol)

 {
 {

-#if defined(_POSIX_C_SOURCE)

     int ret;
     int ret;

-    void *ptr;
-    ret = posix_memalign(&ptr, alignment, size);
-    if (ret != 0)
-        return NULL;
-    return ptr;
-#elif defined(HOST_BSD)
-    return valloc(size);
-#else
-    return memalign(alignment, size);
-#endif
-}

 
 

-/* alloc shared memory pages */
-void *qemu_vmalloc(size_t size)
-{
-#if defined(USE_KQEMU)
-    if (kqemu_allowed)
-        return kqemu_vmalloc(size);
+#ifdef SOCK_CLOEXEC
+    ret = socket(domain, type | SOCK_CLOEXEC, protocol);
+    if (ret != -1 || errno != EINVAL) {
+        return ret;
+    }

 #endif
 #endif

-    return qemu_memalign(getpagesize(), size);
+    ret = socket(domain, type, protocol);
+    if (ret >= 0) {
+        qemu_set_cloexec(ret);
+    }
+
+    return ret;

 }
 
 }
 

-void qemu_vfree(void *ptr)
+/*
+ * Accept a connection and set FD_CLOEXEC
+ */
+int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)

 {
 {

-#if defined(USE_KQEMU)
-    if (kqemu_allowed)
-        kqemu_vfree(ptr);
-#endif
-    free(ptr);
-}
+    int ret;

 
 

+#ifdef CONFIG_ACCEPT4
+    ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
+    if (ret != -1 || errno != ENOSYS) {
+        return ret;
+    }

 #endif
 #endif

+    ret = accept(s, addr, addrlen);
+    if (ret >= 0) {
+        qemu_set_cloexec(ret);
+    }

 
 

-int qemu_create_pidfile(const char *filename)
-{
-    char buffer[128];
-    int len;
-#ifndef _WIN32
-    int fd;
+    return ret;
+}

 
 

-    fd = open(filename, O_RDWR | O_CREAT, 0600);
-    if (fd == -1)
-        return -1;
+/*
+ * A variant of send(2) which handles partial write.
+ *
+ * Return the number of bytes transferred, which is only
+ * smaller than `count' if there is an error.
+ *
+ * This function won't work with non-blocking fd's.
+ * Any of the possibilities with non-bloking fd's is bad:
+ *   - return a short write (then name is wrong)
+ *   - busy wait adding (errno == EAGAIN) to the loop
+ */
+ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags)
+{
+    ssize_t ret = 0;
+    ssize_t total = 0;
+
+    while (count) {
+        ret = send(fd, buf, count, flags);
+        if (ret < 0) {
+            if (errno == EINTR) {
+                continue;
+            }
+            break;
+        }

 
 

-    if (lockf(fd, F_TLOCK, 0) == -1)
-        return -1;
+        count -= ret;
+        buf += ret;
+        total += ret;
+    }

 
 

-    len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
-    if (write(fd, buffer, len) != len)
-        return -1;
-#else
-    HANDLE file;
-    DWORD flags;
-    OVERLAPPED overlap;
-    BOOL ret;
-
-    /* Open for writing with no sharing. */
-    file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
-                     OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
-
-    if (file == INVALID_HANDLE_VALUE)
-      return -1;
-
-    flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
-    overlap.hEvent = 0;
-    /* Lock 1 byte. */
-    ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
-    if (ret == 0)
-      return -1;
-
-    /* Write PID to file. */
-    len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
-    ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
-                     &overlap, NULL);
-    if (ret == 0)
-      return -1;
-#endif
-    return 0;
+    return total;

 }
 
 }
 

-#ifdef _WIN32
-
-/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
-#define _W32_FT_OFFSET (116444736000000000ULL)
-
-int qemu_gettimeofday(qemu_timeval *tp)
+/*
+ * A variant of recv(2) which handles partial write.
+ *
+ * Return the number of bytes transferred, which is only
+ * smaller than `count' if there is an error.
+ *
+ * This function won't work with non-blocking fd's.
+ * Any of the possibilities with non-bloking fd's is bad:
+ *   - return a short write (then name is wrong)
+ *   - busy wait adding (errno == EAGAIN) to the loop
+ */
+ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags)

 {
 {

-  union {
-    unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
-    FILETIME ft;
-  }  _now;
-
-  if(tp)
-    {
-      GetSystemTimeAsFileTime (&_now.ft);
-      tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
-      tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
-    }
-  /* Always return 0 as per Open Group Base Specifications Issue 6.
-     Do not set errno on error.  */
-  return 0;
-}
-#endif /* _WIN32 */
+    ssize_t ret = 0;
+    ssize_t total = 0;
+
+    while (count) {
+        ret = qemu_recv(fd, buf, count, flags);
+        if (ret <= 0) {
+            if (ret < 0 && errno == EINTR) {
+                continue;
+            }
+            break;
+        }

 
 

+        count -= ret;
+        buf += ret;
+        total += ret;
+    }

 
 

-#ifdef _WIN32
-void socket_set_nonblock(int fd)
-{
-    unsigned long opt = 1;
-    ioctlsocket(fd, FIONBIO, &opt);
+    return total;

 }
 
 }
 

-int inet_aton(const char *cp, struct in_addr *ia)
+void qemu_set_version(const char *version)

 {
 {

-    uint32_t addr = inet_addr(cp);
-    if (addr == 0xffffffff)
-       return 0;
-    ia->s_addr = addr;
-    return 1;
+    qemu_version = version;

 }
 }

-#else
-void socket_set_nonblock(int fd)
+
+const char *qemu_get_version(void)

 {
 {

-    int f;
-    f = fcntl(fd, F_GETFL);
-    fcntl(fd, F_SETFL, f | O_NONBLOCK);
+    return qemu_version;

 }
 }

-#endif