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-rw-r--r--src/stdio/perror.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/stdio/perror.c b/src/stdio/perror.c
index fdcb4d71..d0943f26 100644
--- a/src/stdio/perror.c
+++ b/src/stdio/perror.c
@@ -9,6 +9,11 @@ void perror(const char *msg)
char *errstr = strerror(errno);
FLOCK(f);
+
+ /* Save stderr's orientation and encoding rule, since perror is not
+ * permitted to change them. */
+ void *old_locale = f->locale;
+ int old_mode = f->mode;
if (msg && *msg) {
fwrite(msg, strlen(msg), 1, f);
@@ -18,5 +23,8 @@ void perror(const char *msg)
fwrite(errstr, strlen(errstr), 1, f);
fputc('\n', f);
+ f->mode = old_mode;
+ f->locale = old_locale;
+
FUNLOCK(f);
}