Simplify krb5 child handler

Currently the Kerberos child handler evaluates the siginfo_t structure
to wait for a specific child. This scheme is prone to error, especially
when there are more than one child process active, and can produce
missleading debug message. This patch simplifies the scheme as it waits
for any child.

1 files changed, 18 insertions, 17 deletions

diff --git a/server/providers/krb5/krb5_auth.c b/server/providers/krb5/krb5_auth.c
index cc5bc20d..a02147e4 100644
--- a/server/providers/krb5/krb5_auth.c
+++ b/server/providers/krb5/krb5_auth.c
@@ -307,26 +307,27 @@ void krb5_child_sig_handler(struct tevent_context *ev,
 {
     int ret;
     int child_status;
-    siginfo_t *siginfo = (siginfo_t *)__siginfo;
 
-    errno = 0;
+    DEBUG(7, ("Waiting for [%d] childeren.\n", count));
     do {
-        ret = waitpid(siginfo->si_pid, &child_status, WNOHANG);
-    } while (ret == -1 && errno == EINTR);
-    if (ret == siginfo->si_pid) {
-        DEBUG(4, ("child status [%d].\n", child_status));
-        if (WEXITSTATUS(child_status) != 0) {
-            DEBUG(1, ("child failed.\n"));
+        errno = 0;
+        ret = waitpid(-1, &child_status, WNOHANG);
+
+        if (ret == -1) {
+            DEBUG(1, ("waitpid failed [%d][%s].\n", errno, strerror(errno)));
+        } else if (ret == 0) {
+            DEBUG(1, ("waitpid did not found a child with changed status.\n"));
+        } else  {
+            if (WEXITSTATUS(child_status) != 0) {
+                DEBUG(1, ("child [%d] failed with status [%d].\n", ret,
+                          child_status));
+            } else {
+                DEBUG(4, ("child [%d] finished successful.\n", ret));
+            }
         }
-    } else if (ret == 0) {
-        DEBUG(1, ("waitpid did not found a child with changed status.\n", ret));
-    } else if (ret >= 0 && ret != siginfo->si_pid) {
-        DEBUG(1, ("waitpid returned wrong child pid [%d], continue waiting.\n", ret));
-    } else if (ret == -1 && errno == ECHILD) {
-        DEBUG(1, ("no child with pid [%d].\n", siginfo->si_pid));
-    } else {
-        DEBUG(1, ("waitpid failed [%s].\n", strerror(errno)));
-    }
+
+        --count;
+    } while (count < 0);
 
     return;
 }