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#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#define BUFLEN 4096
int
main(int argc, char *argv[])
{
int fd;
int len, slen;
if (argc != 2) {
fprintf(stderr, "Usage: %s <file>\n", argv[0]);
exit(EXIT_FAILURE);
}
fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
fprintf(stderr, "Logging to %s: ", argv[1]);
slen = 0;
do {
len = splice(STDIN_FILENO, NULL, fd, NULL,
BUFLEN, SPLICE_F_MOVE);
if (len < 0) {
if (errno == EAGAIN)
continue;
perror("tee");
exit(EXIT_FAILURE);
} else
if (len == 0)
break;
slen += len;
if ((slen/BUFLEN) > 0) {
fprintf(stderr, ".");
}
slen = slen % BUFLEN;
} while (1);
close(fd);
fprintf(stderr, "\n");
exit(EXIT_SUCCESS);
}
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