Thanks!
On Tue, Aug 27, 2024 at 11:22 AM Alejandro Colomar <alx@xxxxxxxxxx> wrote:
>
> Hi Absee,
>
> On Tue, Aug 27, 2024 at 06:09:33AM GMT, Absee Seeab wrote:
> > I'm not sure that's a good way to construct documentation examples
> > personally, but here is an example program demonstrating that my claim
> > is correct, as I agree that's useful for you to have.
> > Feel free to edit it as you see fit.
>
> Thanks!
>
> I've rewritten it to:
>
>
> #define _GNU_SOURCE
> #define _FILE_OFFSET_BITS 64
> #include <err.h>
> #include <fcntl.h>
> #include <stdint.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
>
> int
> main(void)
> {
> int fd;
> int pfd[2];
> off_t off;
> const char s[12] = "Hello, world";
>
> fd = open("out", O_WRONLY | O_CREAT | O_EXCL, 0666);
> if (fd == -1)
> err(EXIT_FAILURE, "open");
>
> if (pipe(pfd) == -1)
> err(EXIT_FAILURE, "pipe");
>
> if (write(pfd[1], s, sizeof(s)) != sizeof(s))
> err(EXIT_FAILURE, "write");
> if (close(pfd[1]) == -1)
> err(EXIT_FAILURE, "close");
>
> off = 10;
> if (splice(pfd[0], NULL, fd, &off, sizeof(s), 0) != sizeof(s))
> err(EXIT_FAILURE, "splice");
> if (close(pfd[0]) == -1)
> err(EXIT_FAILURE, "close");
>
> printf("New offset is %jd\n", (intmax_t) off);
>
> if (close(fd) == -1)
> err(EXIT_FAILURE, "close");
> exit(EXIT_SUCCESS);
> }
>
> And used it as
>
> $ gcc -Wall -Wextra splice.c
> $ ./a.out
> New offset is 22
> $ echo $?
> 0
> $ hd out
> 00000000 00 00 00 00 00 00 00 00 00 00 48 65 6c 6c 6f 2c |..........Hello,|
> 00000010 20 77 6f 72 6c 64 | world|
> 00000016
>
>
> I think this is interesting information to readers of the page. (And we
> didn't have an example, so this is better than nothing.)
>
> I'll put it all together in a patch.
>
> Have a lovely day!
> Alex
>
>
> --
> <https://www.alejandro-colomar.es/>
