qga: move qga_get_host_name()

The function is specific to qemu-ga, no need to share it in QEMU.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Message-Id: <20220420132624.2439741-32-marcandre.lureau@redhat.com>

include/qemu/osdep.h

@@ -656,16 +656,6 @@ int qemu_fdatasync(int fd);
  */
 int qemu_msync(void *addr, size_t length, int fd);
 
-/**
- * qemu_get_host_name:
- * @errp: Error object
- *
- * Operating system agnostic way of querying host name.
- *
- * Returns allocated hostname (caller should free), NULL on failure.
- */
-char *qemu_get_host_name(Error **errp);
-
 /**
  * qemu_get_host_physmem:
  *

qga/commands-common.h

@@ -18,4 +18,15 @@ GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp);
 GuestFileRead *guest_file_read_unsafe(GuestFileHandle *gfh,
                                       int64_t count, Error **errp);
 
+/**
+ * qga_get_host_name:
+ * @errp: Error object
+ *
+ * Operating system agnostic way of querying host name.
+ * Compared to g_get_host_name(), it doesn't cache the result.
+ *
+ * Returns allocated hostname (caller should free), NULL on failure.
+ */
+char *qga_get_host_name(Error **errp);
+
 #endif

qga/commands-posix.c

@@ -3278,3 +3278,38 @@ GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
 
     return NULL;
 }
+
+#ifndef HOST_NAME_MAX
+# ifdef _POSIX_HOST_NAME_MAX
+#  define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
+# else
+#  define HOST_NAME_MAX 255
+# endif
+#endif
+
+char *qga_get_host_name(Error **errp)
+{
+    long len = -1;
+    g_autofree char *hostname = NULL;
+
+#ifdef _SC_HOST_NAME_MAX
+    len = sysconf(_SC_HOST_NAME_MAX);
+#endif /* _SC_HOST_NAME_MAX */
+
+    if (len < 0) {
+        len = HOST_NAME_MAX;
+    }
+
+    /* Unfortunately, gethostname() below does not guarantee a
+     * NULL terminated string. Therefore, allocate one byte more
+     * to be sure. */
+    hostname = g_new0(char, len + 1);
+
+    if (gethostname(hostname, len) < 0) {
+        error_setg_errno(errp, errno,
+                         "cannot get hostname");
+        return NULL;
+    }
+
+    return g_steal_pointer(&hostname);
+}

qga/commands-win32.c

@@ -2519,3 +2519,16 @@ GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
     }
     return head;
 }
+
+char *qga_get_host_name(Error **errp)
+{
+    wchar_t tmp[MAX_COMPUTERNAME_LENGTH + 1];
+    DWORD size = G_N_ELEMENTS(tmp);
+
+    if (GetComputerNameW(tmp, &size) == 0) {
+        error_setg_win32(errp, GetLastError(), "failed close handle");
+        return NULL;
+    }
+
+    return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL);
+}

qga/commands.c

@@ -511,7 +511,7 @@ int ga_parse_whence(GuestFileWhence *whence, Error **errp)
 GuestHostName *qmp_guest_get_host_name(Error **errp)
 {
     GuestHostName *result = NULL;
-    g_autofree char *hostname = qemu_get_host_name(errp);
+    g_autofree char *hostname = qga_get_host_name(errp);
 
     /*
      * We want to avoid using g_get_host_name() because that

util/oslib-posix.c

@@ -886,41 +886,6 @@ void sigaction_invoke(struct sigaction *action,
     action->sa_sigaction(info->ssi_signo, &si, NULL);
 }
 
-#ifndef HOST_NAME_MAX
-# ifdef _POSIX_HOST_NAME_MAX
-#  define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
-# else
-#  define HOST_NAME_MAX 255
-# endif
-#endif
-
-char *qemu_get_host_name(Error **errp)
-{
-    long len = -1;
-    g_autofree char *hostname = NULL;
-
-#ifdef _SC_HOST_NAME_MAX
-    len = sysconf(_SC_HOST_NAME_MAX);
-#endif /* _SC_HOST_NAME_MAX */
-
-    if (len < 0) {
-        len = HOST_NAME_MAX;
-    }
-
-    /* Unfortunately, gethostname() below does not guarantee a
-     * NULL terminated string. Therefore, allocate one byte more
-     * to be sure. */
-    hostname = g_new0(char, len + 1);
-
-    if (gethostname(hostname, len) < 0) {
-        error_setg_errno(errp, errno,
-                         "cannot get hostname");
-        return NULL;
-    }
-
-    return g_steal_pointer(&hostname);
-}
-
 size_t qemu_get_host_physmem(void)
 {
 #ifdef _SC_PHYS_PAGES

util/oslib-win32.c

@@ -573,19 +573,6 @@ bool qemu_write_pidfile(const char *filename, Error **errp)
     return true;
 }
 
-char *qemu_get_host_name(Error **errp)
-{
-    wchar_t tmp[MAX_COMPUTERNAME_LENGTH + 1];
-    DWORD size = G_N_ELEMENTS(tmp);
-
-    if (GetComputerNameW(tmp, &size) == 0) {
-        error_setg_win32(errp, GetLastError(), "failed close handle");
-        return NULL;
-    }
-
-    return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL);
-}
-
 size_t qemu_get_host_physmem(void)
 {
     MEMORYSTATUSEX statex;