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/>
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