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46 lines
777 B
46 lines
777 B
#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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