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-rw-r--r--lib/errors/vwarn.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/errors/vwarn.c b/lib/errors/vwarn.c
index 342c391..bc1dda7 100644
--- a/lib/errors/vwarn.c
+++ b/lib/errors/vwarn.c
@@ -9,9 +9,11 @@ void
vwarn(const char *fmt, va_list ap)
{
int save = errno;
+ flockfile(stderr);
fprintf(stderr, "%s: ", mlib_progname());
vfprintf(stderr, fmt, ap);
if (fmt[strlen(fmt) - 1] == ':')
fprintf(stderr, " %s", strerror(save));
fputc('\n', stderr);
+ funlockfile(stderr);
}