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47 lines
777 B
47 lines
777 B
7 years ago
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <limits.h>
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int
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main(int argc, char *argv[])
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{
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int fd;
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int len, slen;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <file>\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if (fd == -1) {
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perror("open");
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exit(EXIT_FAILURE);
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}
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fprintf(stderr, "Logging to %s: ", argv[1]);
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do {
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len = splice(STDIN_FILENO, NULL, fd, NULL,
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65536, SPLICE_F_MOVE);
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if (len < 0) {
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if (errno == EAGAIN)
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continue;
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perror("tee");
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exit(EXIT_FAILURE);
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} else
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if (len == 0)
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break;
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fprintf(stderr, ".", len);
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} while (1);
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close(fd);
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fprintf(stderr, "\n");
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exit(EXIT_SUCCESS);
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}
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