If a child exits before opening TST_CHECKPOINT_FIFO
for reading, tst_checkpoint_signal_child() issued from the parent
will block forever.
To handle such situations added timeout logic to tst_checkpoint_signal_child();
Signed-off-by: Stanislav Kholmanskikh <stanislav.kholmansk...@oracle.com>
---
lib/tst_checkpoint.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 53 insertions(+), 4 deletions(-)
diff --git a/lib/tst_checkpoint.c b/lib/tst_checkpoint.c
index 56c86b5..842ac74 100644
--- a/lib/tst_checkpoint.c
+++ b/lib/tst_checkpoint.c
@@ -30,9 +30,52 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <poll.h>
+#include <time.h>
#include "tst_checkpoint.h"
+/*
+ * Issue open() on 'path' fifo with O_WRONLY flag and wait for
+ * a reader up to 'timeout' ms.
+ *
+ * Returns:
+ * > 0 - file descriptor
+ * -1 - an error has occurred (errno is set accordingly)
+ *
+ */
+int open_wronly_timed(const char *path, unsigned int timeout)
+{
+ int fd;
+ int interval_ms = 1; /* how often issue open(O_NONBLOCK) */
+ long timeleft = timeout;
+
+ struct timespec interval;
+ interval.tv_sec = 0;
+ interval.tv_nsec = interval_ms * 1000000; /* in ns */
+
+ for (;;) {
+ fd = open(path, O_WRONLY | O_NONBLOCK);
+ if (fd < 0) {
+ if ((errno == ENXIO) || (errno == EINTR)) {
+ if (timeleft <= 0) {
+ errno = ETIMEDOUT;
+
+ return -1;
+ }
+
+ timeleft -= interval_ms;
+ nanosleep(&interval, NULL);
+
+ continue;
+ }
+
+ return -1;
+ }
+
+ return fd;
+ }
+}
+
void tst_checkpoint_init(const char *file, const int lineno,
struct tst_checkpoint *self)
{
@@ -195,12 +238,18 @@ void tst_checkpoint_signal_child(const char *file, const
int lineno,
{
int ret, fd;
- fd = open(TST_CHECKPOINT_FIFO, O_WRONLY);
+ fd = open_wronly_timed(TST_CHECKPOINT_FIFO, self->timeout);
if (fd < 0) {
- tst_brkm(TBROK | TERRNO, cleanup_fn,
- "Failed to open fifo '%s' at %s:%d",
- TST_CHECKPOINT_FIFO, file, lineno);
+ if (errno == ETIMEDOUT) {
+ tst_brkm(TBROK, cleanup_fn,
+ "Checkpoint timeouted after %u msecs at %s:%d",
+ self->timeout, file, lineno);
+ } else {
+ tst_brkm(TBROK | TERRNO, cleanup_fn,
+ "Failed to open fifo '%s' at %s:%d",
+ TST_CHECKPOINT_FIFO, file, lineno);
+ }
}
ret = write(fd, "p", 1);
--
1.7.1
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