Set O_APPEND mode for stdout/stderr and output-sync temporary files.

POSIX does not guarantee that writes will be atomic if a file is
opened for normal (non-append) output.  That means if multiple processes
are writing to the same file, output could be lost.  I can't think of
a real use-case where we would NOT want append for stdout/stderr, so
force it if we can.

1 files changed, 1 insertions, 0 deletions

diff --git a/makeint.h b/makeint.h
index f1196807..b51e914f 100644
--- a/makeint.h
+++ b/makeint.h
@@ -453,6 +453,7 @@ int alpha_compare (const void *, const void *);
 void print_spaces (unsigned int);
 char *find_percent (char *);
 const char *find_percent_cached (const char **);
+void set_append_mode (int);
 int open_tmpfd (void);
 FILE *open_tmpfile (char **, const char *);