qemu-ga: guest_suspend(): improve error reporting

Most errors are QERR_UNDEFINED_ERROR today.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index f3ee492..614a421 100644 (file)
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -702,8 +702,9 @@ out:
 static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
                           Error **err)
 {
+    Error *local_err = NULL;
     char *pmutils_path;
-    pid_t rpid, pid;
+    pid_t pid;
     int status;
 
     pmutils_path = g_find_program_in_path(pmutils_bin);
@@ -741,23 +742,29 @@ static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
         }
 
         _exit(EXIT_SUCCESS);
+    } else if (pid < 0) {
+        error_setg_errno(err, errno, "failed to create child process");
+        goto out;
     }
 
-    g_free(pmutils_path);
+    ga_wait_child(pid, &status, &local_err);
+    if (error_is_set(&local_err)) {
+        error_propagate(err, local_err);
+        goto out;
+    }
 
-    if (pid < 0) {
-        goto exit_err;
+    if (!WIFEXITED(status)) {
+        error_setg(err, "child process has terminated abnormally");
+        goto out;
     }
 
-    do {
-        rpid = waitpid(pid, &status, 0);
-    } while (rpid == -1 && errno == EINTR);
-    if (rpid == pid && WIFEXITED(status) && !WEXITSTATUS(status)) {
-        return;
+    if (WEXITSTATUS(status)) {
+        error_setg(err, "child process has failed to suspend");
+        goto out;
     }
 
-exit_err:
-    error_set(err, QERR_UNDEFINED_ERROR);
+out:
+    g_free(pmutils_path);
 }
 
 void qmp_guest_suspend_disk(Error **err)