Quoting sukadev@xxxxxxxxxx (sukadev@xxxxxxxxxx):
>
> >From 0f5b3ea20238e0704a71252a3d495ca0db61e1dc Mon Sep 17 00:00:00 2001
> From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
> Date: Sat, 14 Jun 2008 11:45:00 -0700
> Subject: [RFC][PATCH] Read/print contents of fifo.
>
> To test that checkpoint/restart of pipes is working, read
> one byte at a time from the pipe and write to stdout.
>
> After checkpoint, both the checkpointed application and the
> restarted application should continue reading from the checkpoint.
>
> The '-e' option to the program, tests with an empty pipe.
>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx>
Thanks, will apply to the git tree tonight.
-serge
> ---
> tests/pipe.c | 32 ++++++++++++++++++++++++++++----
> 1 files changed, 28 insertions(+), 4 deletions(-)
>
> diff --git a/tests/pipe.c b/tests/pipe.c
> index cc3cdfd..0812cb3 100644
> --- a/tests/pipe.c
> +++ b/tests/pipe.c
> @@ -3,25 +3,49 @@
> #include <unistd.h>
> #include <stdlib.h>
> #include <string.h>
> +#include <errno.h>
> +#include <sys/fcntl.h>
>
> -int main()
> +int main(int argc, char *argv[])
> {
> int i = 0;
> + int rc;
> int fds[2];
> + int c;
> + int empty;
> char *buf = "abcdefghijklmnopqrstuvwxyz";
>
> + /*
> + * -e: test with an empty pipe
> + */
> + empty = 0;
> + if (argc > 1 && strcmp(argv[1], "-e") == 0)
> + empty = 1;
> +
> if (pipe(fds) < 0) {
> perror("pipe()");
> exit(1);
> }
>
> - write(fds[1], buf, strlen(buf));
> + if (!empty)
> + write(fds[1], buf, strlen(buf));
>
> + if (fcntl(fds[0], F_SETFL, O_NONBLOCK) < 0) {
> + perror("fcntl()");
> + exit(1);
> + }
> printf("Running as %d\n", getpid());
> while (i<100) {
> sleep(1);
> - if (i%5 == 0)
> - printf("i is %d (pid %d)\n", i, getpid());
> + if (i%5 == 0) {
> + c = errno = 0;
> + rc = read(fds[0], &c, 1);
> + if (rc != 1) {
> + perror("read() failed");
> + }
> + printf("i is %d (pid %d), c is %c\n", i, getpid(), c);
> +
> + }
> i++;
> }
> }
> --
> 1.5.2.5
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