----- Original Message -----
> From: "Stanislav Kholmanskikh" <stanislav.kholmansk...@oracle.com>
> To: ltp-list@lists.sourceforge.net
> Cc: "vasily isaenko" <vasily.isae...@oracle.com>
> Sent: Thursday, 14 November, 2013 7:37:57 AM
> Subject: [LTP] [PATCH V3 2/2] tst_checkpoint_signal_child: implemented
> timeout
>
> 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>
One small nit: the comment should say ">= 0", other than that, it looks good to
me:
Reviewed-by: Jan Stancek <jstan...@redhat.com>
I'm sending a follow-up patch (tst_checkpoint_child_exits2), which I used to
verify this one.
Regards,
Jan
> ---
> lib/tst_checkpoint.c | 36 +++++++++++++++++++++++++++++++++++-
> 1 files changed, 35 insertions(+), 1 deletions(-)
>
> diff --git a/lib/tst_checkpoint.c b/lib/tst_checkpoint.c
> index 56c86b5..e53c499 100644
> --- a/lib/tst_checkpoint.c
> +++ b/lib/tst_checkpoint.c
> @@ -33,6 +33,40 @@
>
> #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 i;
> + int interval = 1; /* how often issue open(O_NONBLOCK), in ms */
> +
> + for (i = 0; i < timeout; i += interval) {
> + fd = open(path, O_WRONLY | O_NONBLOCK);
> + if (fd < 0) {
> + if ((errno == ENXIO) || (errno == EINTR)) {
> + usleep(interval * 1000);
> +
> + continue;
> + }
> +
> + return -1;
> + }
> +
> + return fd;
> + }
> +
> + errno = ETIMEDOUT;
> + return -1;
> +}
> +
> void tst_checkpoint_init(const char *file, const int lineno,
> struct tst_checkpoint *self)
> {
> @@ -195,7 +229,7 @@ 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,
> --
> 1.7.1
>
>
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