Hi Anders,
Ack. Comments inline.
I hope some of these changes will reflect in later branches of 4.2.x
i.e., on 4.3.x and default as well.
Thanks,
Ramesh.
On 12/5/2013 6:42 PM, Anders Widell wrote:
> osaf/services/infrastructure/nid/nodeinit.c | 9 +++++++--
> 1 files changed, 7 insertions(+), 2 deletions(-)
>
>
> There were three loops in nodeinit.c that could potentially become infinite
> if a
> system call returns -1. It is fine to try again when e.g. errno == EINTR,
> since
> that is a temporary error that will go away eventually. In general however,
> trying again will not make the error go away and the loop would become
> infinite.
> Also made a file descriptor non-blocking to avoid blocking indefinitely in
> read().
>
> diff --git a/osaf/services/infrastructure/nid/nodeinit.c
> b/osaf/services/infrastructure/nid/nodeinit.c
> --- a/osaf/services/infrastructure/nid/nodeinit.c
> +++ b/osaf/services/infrastructure/nid/nodeinit.c
> @@ -46,6 +46,8 @@
> * any notification. *
> ************************************************************************/
>
> +#include <unistd.h>
> +#include <fcntl.h>
> #include <syslog.h>
> #include <libgen.h>
> #include <ctype.h>
> @@ -621,6 +623,8 @@ int32_t fork_daemon(NID_SPAWN_INFO *serv
>
> if(-1 == pipe(filedes))
> LOG_ER("Problem creating pipe: %s", strerror(errno));
> + else
> + fcntl(filedes[0], F_SETFL, fcntl(filedes[0], F_GETFL) |
> O_NONBLOCK);
>
> if ((pid = fork()) == 0) {
> if (nis_fifofd > 0)
> @@ -641,10 +645,10 @@ int32_t fork_daemon(NID_SPAWN_INFO *serv
> continue;
> else if (errno == EPIPE) {
> LOG_ER("Reader not available to return my PID");
> - exit(2);
> } else {
> LOG_ER("Problem writing to pipe, err=%s",
> strerror(errno));
> }
> + exit(2);
[Ramesh]: How about retrying for fixed number of times for EAGAIN errno.
> }
>
> setsid();
> @@ -691,6 +695,7 @@ int32_t fork_daemon(NID_SPAWN_INFO *serv
> }
> if (errno == EINTR)
> continue;
> + break;
[Ramesh]: Below of this while-loop there is a while-loop for read(), in
this case too can we consider for retry fixed number of times for EAGAIN
errno.
> }
>
> while (read(filedes[0], &tmp_pid, sizeof(int)) < 0)
> @@ -1002,7 +1007,7 @@ uint32_t spawn_wait(NID_SPAWN_INFO *serv
> LOG_ER("Timed-out for response from %s",
> service->serv_name);
> return NCSCC_RC_FAILURE;
> }
> -
> + break;
> }
>
> /* Read the message from FIFO and fill in structure. */
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