diff options
Diffstat (limited to 'src/backend/storage/file/fd.c')
| -rw-r--r-- | src/backend/storage/file/fd.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c index 433e2832a54..f9cda6906d2 100644 --- a/src/backend/storage/file/fd.c +++ b/src/backend/storage/file/fd.c @@ -934,7 +934,9 @@ InitTemporaryFileAccess(void) * of already_open will give the right answer. In practice, max_to_probe * of a couple of dozen should be enough to ensure good results. * - * We assume stdin (FD 0) is available for dup'ing + * We assume stderr (FD 2) is available for dup'ing. While the calling + * script could theoretically close that, it would be a really bad idea, + * since then one risks loss of error messages from, e.g., libc. */ static void count_usable_fds(int max_to_probe, int *usable_fds, int *already_open) @@ -978,12 +980,12 @@ count_usable_fds(int max_to_probe, int *usable_fds, int *already_open) break; #endif - thisfd = dup(0); + thisfd = dup(2); if (thisfd < 0) { /* Expect EMFILE or ENFILE, else it's fishy */ if (errno != EMFILE && errno != ENFILE) - elog(WARNING, "dup(0) failed after %d successes: %m", used); + elog(WARNING, "duplicating stderr file descriptor failed after %d successes: %m", used); break; } |