merge POSIX.1-1988/1990

1 files changed, 19 insertions, 0 deletions

diff --git a/src/unistd/isatty.c b/src/unistd/isatty.c
new file mode 100644
index 00000000..baafa508
--- /dev/null
+++ b/src/unistd/isatty.c
@@ -0,0 +1,19 @@
+#include "stddef.h"
+#include "sys/types.h"
+#include <unistd.h>
+#include "errno.h"
+#include "nonstd/syscall.h"
+
+int isatty(int fildes)
+{
+	SCNO(scno, "isatty", 0);
+	int r = __libc.syscall(scno, fildes);
+	if (r < 0) {
+		errno = -r;
+		return 0;
+	}
+	return r;
+}
+/*
+POSIX(1)
+*/