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Fix pg_recvlogical not to fsync output when it's a tty or pipe.

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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.
This commit is contained in:
Andres Freund 2015-07-07 12:47:44 +02:00
parent 02eac01f91
commit 5c0de384d2
1 changed files with 15 additions and 2 deletions
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17
src/bin/pg_basebackup/pg_recvlogical.c
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@ -50,6 +50,7 @@ static const char *plugin = "test_decoding";
static int outfd = -1;
static volatile sig_atomic_t time_to_abort = false;
static volatile sig_atomic_t output_reopen = false;
static bool output_isfile;
static int64 output_last_fsync = -1;
static bool output_needs_fsync = false;
static XLogRecPtr output_written_lsn = InvalidXLogRecPtr;
@ -177,8 +178,11 @@ OutputFsync(int64 now)
output_needs_fsync = false;
/* Accept EINVAL, in case output is writing to a pipe or similar. */
if (fsync(outfd) != 0 && errno != EINVAL)
/* can only fsync if it's a regular file */
if (!output_isfile)
return true;
if (fsync(outfd) != 0)
{
fprintf(stderr,
_("%s: could not fsync log file \"%s\": %s\n"),
@ -317,6 +321,8 @@ StreamLogicalLog(void)
/* open the output file, if not open yet */
if (outfd == -1)
{
struct stat statbuf;
if (strcmp(outfile, "-") == 0)
outfd = fileno(stdout);
else
@ -329,6 +335,13 @@ StreamLogicalLog(void)
progname, outfile, strerror(errno));
goto error;
}
if (fstat(outfd, &statbuf) != 0)
fprintf(stderr,
_("%s: could not stat file \"%s\": %s\n"),
progname, outfile, strerror(errno));
output_isfile = S_ISREG(statbuf.st_mode) && !isatty(outfd);
}
r = PQgetCopyData(conn, &copybuf, 1);