util: conditionalize virProcess APIs on Windows

Many of the virProcess APIs are relying on GNULIB providing
POSIX API stubs. Even with these stubs the APIs don't do
anything useful once compiled. We can thus conditionalize
the code so that we don't compile anything at all.
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/util/virprocess.c

@@ -24,7 +24,9 @@
 
 #include <fcntl.h>
 #include <signal.h>
-#include <sys/wait.h>
+#ifndef WIN32
+# include <sys/wait.h>
+#endif
 #include <unistd.h>
 #if HAVE_SYS_MOUNT_H
 # include <sys/mount.h>
@@ -121,6 +123,8 @@ VIR_ENUM_IMPL(virProcessSchedPolicy,
               "rr",
 );
 
+
+#ifndef WIN32
 /**
  * virProcessTranslateStatus:
  * @status: child exit status to translate
@@ -146,7 +150,6 @@ virProcessTranslateStatus(int status)
 }
 
 
-#ifndef WIN32
 /**
  * virProcessAbort:
  * @pid: child process to kill
@@ -206,14 +209,6 @@ virProcessAbort(pid_t pid)
  cleanup:
     errno = saved_errno;
 }
-#else
-void
-virProcessAbort(pid_t pid)
-{
-    /* Not yet ported to mingw.  Any volunteers?  */
-    VIR_DEBUG("failed to reap child %lld, abandoning it", (long long)pid);
-}
-#endif
 
 
 /**
@@ -282,6 +277,33 @@ virProcessWait(pid_t pid, int *exitstatus, bool raw)
     return -1;
 }
 
+#else /* WIN32 */
+
+char *
+virProcessTranslateStatus(int status)
+{
+    return g_strdup_printf(_("invalid value %d"), status);
+}
+
+
+void
+virProcessAbort(pid_t pid)
+{
+    /* Not yet ported to mingw.  Any volunteers?  */
+    VIR_DEBUG("failed to reap child %lld, abandoning it", (long long)pid);
+}
+
+
+int
+virProcessWait(pid_t pid, int *exitstatus G_GNUC_UNUSED, bool raw G_GNUC_UNUSED)
+{
+    virReportSystemError(ENOSYS, _("unable to wait for process %lld"),
+                         (long long) pid);
+    return -1;
+}
+
+#endif /* WIN32 */
+
 
 /* send signal to a single process */
 int virProcessKill(pid_t pid, int sig)
@@ -1036,6 +1058,7 @@ int virProcessGetStartTime(pid_t pid,
 #endif
 
 
+#ifdef __linux__
 typedef struct _virProcessNamespaceHelperData virProcessNamespaceHelperData;
 struct _virProcessNamespaceHelperData {
     pid_t pid;
@@ -1088,7 +1111,22 @@ virProcessRunInMountNamespace(pid_t pid,
     return virProcessRunInFork(virProcessNamespaceHelper, &data);
 }
 
+#else /* ! __linux__ */
 
+int
+virProcessRunInMountNamespace(pid_t pid G_GNUC_UNUSED,
+                              virProcessNamespaceCallback cb G_GNUC_UNUSED,
+                              void *opaque G_GNUC_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Namespaces are not supported on this platform"));
+    return -1;
+}
+
+#endif /* ! __linux__ */
+
+
+#ifndef WIN32
 static int
 virProcessRunInForkHelper(int errfd,
                           pid_t ppid,
@@ -1174,8 +1212,21 @@ virProcessRunInFork(virProcessForkCallback cb,
     return ret;
 }
 
+#else /* WIN32 */
+
+int
+virProcessRunInFork(virProcessForkCallback cb G_GNUC_UNUSED,
+                    void *opaque G_GNUC_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Process spawning is not supported on this platform"));
+    return -1;
+}
+
+#endif /* WIN32 */
 
-#if defined(HAVE_SYS_MOUNT_H) && defined(HAVE_UNSHARE)
+
+#if defined(__linux__)
 int
 virProcessSetupPrivateMountNS(void)
 {
@@ -1194,24 +1245,14 @@ virProcessSetupPrivateMountNS(void)
     return 0;
 }
 
-#else /* !defined(HAVE_SYS_MOUNT_H) || !defined(HAVE_UNSHARE) */
-
-int
-virProcessSetupPrivateMountNS(void)
-{
-    virReportSystemError(ENOSYS, "%s",
-                         _("Namespaces are not supported on this platform."));
-    return -1;
-}
-#endif /* !defined(HAVE_SYS_MOUNT_H) || !defined(HAVE_UNSHARE) */
 
-#if defined(__linux__)
 G_GNUC_NORETURN static int
 virProcessDummyChild(void *argv G_GNUC_UNUSED)
 {
     _exit(0);
 }
 
+
 /**
  * virProcessNamespaceAvailable:
  * @ns: what namespaces to check (bitwise-OR of virProcessNamespaceFlags)
@@ -1269,6 +1310,14 @@ virProcessNamespaceAvailable(unsigned int ns)
 
 #else /* !defined(__linux__) */
 
+int
+virProcessSetupPrivateMountNS(void)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Namespaces are not supported on this platform."));
+    return -1;
+}
+
 int
 virProcessNamespaceAvailable(unsigned int ns G_GNUC_UNUSED)
 {
@@ -1276,6 +1325,7 @@ virProcessNamespaceAvailable(unsigned int ns G_GNUC_UNUSED)
                          _("Namespaces are not supported on this platform."));
     return -1;
 }
+
 #endif /* !defined(__linux__) */
 
 /**
@@ -1296,6 +1346,7 @@ virProcessExitWithStatus(int status)
 {
     int value = EXIT_CANNOT_INVOKE;
 
+#ifndef WIN32
     if (WIFEXITED(status)) {
         value = WEXITSTATUS(status);
     } else if (WIFSIGNALED(status)) {
@@ -1312,6 +1363,9 @@ virProcessExitWithStatus(int status)
         raise(WTERMSIG(status));
         value = 128 + WTERMSIG(status);
     }
+#else /* WIN32 */
+    (void)status;
+#endif /* WIN32 */
     exit(value);
 }