tests: (mkfds) quit when a byte is given via standard input

The original code monitored only SIGCONT.  It is suitable for using
the command from a test script.  Monitoring standard input is helpful
for developing a new factory interactively.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

diff --git a/tests/helpers/test_mkfds.c b/tests/helpers/test_mkfds.c
index 994da2b77e39cabc91ef452b5c7aa91ae92af25a..ba6e287939ca6d956271c50d7283825edfedc770 100644 (file)
--- a/tests/helpers/test_mkfds.c
+++ b/tests/helpers/test_mkfds.c
@@ -34,6 +34,7 @@
 #include <sys/inotify.h>
 #include <sys/mman.h>
 #include <sys/prctl.h>
+#include <sys/select.h>
 #include <sys/socket.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
@@ -1056,6 +1057,27 @@ pidfd_open(pid_t pid _U_, unsigned int flags _U_)
 }
 #endif
 
+static void wait_event(void)
+{
+       fd_set readfds;
+       sigset_t sigset;
+       int n = 0;
+
+       FD_ZERO(&readfds);
+       /* Monitor the standard input only when the process
+        * is in foreground. */
+       if (tcgetpgrp(STDIN_FILENO) == getpgrp()) {
+               n = 1;
+               FD_SET(0, &readfds);
+       }
+
+       sigemptyset(&sigset);
+
+       if (pselect(n, &readfds, NULL, NULL, NULL, &sigset) < 0
+           && errno != EINTR)
+               errx(EXIT_FAILURE, _("failed in pselect"));
+}
+
 int main(int argc, char **argv)
 {
        int c;
@@ -1150,7 +1172,7 @@ int main(int argc, char **argv)
        }
 
        if (!cont)
-               pause();
+               wait_event();
 
        for (int i = 0; i < factory->N + factory->EX_N; i++)
                if (fdescs[i].fd >= 0 && fdescs[i].close)