Initial version

1 files changed, 30 insertions, 0 deletions

diff --git a/src/stdio/perror.c b/src/stdio/perror.c
new file mode 100644
index 0000000..d0943f2
--- /dev/null
+++ b/src/stdio/perror.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "stdio_impl.h"
+
+void perror(const char *msg)
+{
+	FILE *f = stderr;
+	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);
+		fputc(':', f);
+		fputc(' ', f);
+	}
+	fwrite(errstr, strlen(errstr), 1, f);
+	fputc('\n', f);
+
+	f->mode = old_mode;
+	f->locale = old_locale;
+
+	FUNLOCK(f);
+}