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Fix pg_recvlogical not to fsync output when it's a tty or pipe.
The previous coding tried to handle possible failures when fsyncing a tty or pipe fd by accepting EINVAL - but apparently some platforms (windows, OSX) don't reliably return that. So instead check whether the output fd refers to a pipe or a tty when opening it. Reported-By: Olivier Gosseaume, Marko Tiikkaja Discussion: 559AF98B.3050901@joh.to Backpatch to 9.4, where pg_recvlogical was added.
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@ -50,6 +50,7 @@ static const char *plugin = "test_decoding";
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static int outfd = -1;
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static volatile sig_atomic_t time_to_abort = false;
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static volatile sig_atomic_t output_reopen = false;
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static bool output_isfile;
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static int64 output_last_fsync = -1;
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static bool output_needs_fsync = false;
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static XLogRecPtr output_written_lsn = InvalidXLogRecPtr;
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@ -177,8 +178,11 @@ OutputFsync(int64 now)
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output_needs_fsync = false;
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/* Accept EINVAL, in case output is writing to a pipe or similar. */
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if (fsync(outfd) != 0 && errno != EINVAL)
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/* can only fsync if it's a regular file */
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if (!output_isfile)
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return true;
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if (fsync(outfd) != 0)
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{
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fprintf(stderr,
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_("%s: could not fsync log file \"%s\": %s\n"),
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@ -317,6 +321,8 @@ StreamLogicalLog(void)
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/* open the output file, if not open yet */
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if (outfd == -1)
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{
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struct stat statbuf;
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if (strcmp(outfile, "-") == 0)
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outfd = fileno(stdout);
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else
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@ -329,6 +335,13 @@ StreamLogicalLog(void)
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progname, outfile, strerror(errno));
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goto error;
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}
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if (fstat(outfd, &statbuf) != 0)
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fprintf(stderr,
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_("%s: could not stat file \"%s\": %s\n"),
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progname, outfile, strerror(errno));
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output_isfile = S_ISREG(statbuf.st_mode) && !isatty(outfd);
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}
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r = PQgetCopyData(conn, ©buf, 1);
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