apps/speed.c: Wait for generated children

In multi-mode, speed fork()s off several children but does not wait for them.
On Linux, this leads to wrong accounting information of getrusage used by
tools to extract running time and page faults.

Wait for every children and check the return code and termination signal.

Signed-off-by: Juergen Christ <jchrist@linux.ibm.com>

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19093)

1 files changed, 16 insertions, 0 deletions

diff --git a/apps/speed.c b/apps/speed.c
index 469a1a4441..9b9016b61c 100644
--- a/apps/speed.c
+++ b/apps/speed.c
@@ -67,6 +67,7 @@
 #  define HAVE_FORK 0
 # else
 #  define HAVE_FORK 1
+#  include <sys/wait.h>
 # endif
 #endif
 
@@ -3432,6 +3433,7 @@ static int do_multi(int multi, int size_num)
     int n;
     int fd[2];
     int *fds;
+    int status;
     static char sep[] = ":";
 
     fds = app_malloc(sizeof(*fds) * multi, "fd buffer for do_multi");
@@ -3581,6 +3583,20 @@ static int do_multi(int multi, int size_num)
         fclose(f);
     }
     OPENSSL_free(fds);
+    for (n = 0; n < multi; ++n) {
+        while (wait(&status) == -1)
+            if (errno != EINTR) {
+                BIO_printf(bio_err, "Waitng for child failed with 0x%x\n",
+                           errno);
+                return 1;
+            }
+        if (WIFEXITED(status) && WEXITSTATUS(status)) {
+            BIO_printf(bio_err, "Child exited with %d\n", WEXITSTATUS(status));
+        } else if (WIFSIGNALED(status)) {
+            BIO_printf(bio_err, "Child terminated by signal %d\n",
+                       WTERMSIG(status));
+        }
+    }
     return 1;
 }
 #endif