1 files changed, 61 insertions, 0 deletions
diff --git a/src/fcntl/fcntl.c b/src/fcntl/fcntl.c
new file mode 100644
index 00000000..18288776
--- /dev/null
+++ b/src/fcntl/fcntl.c
@@ -0,0 +1,61 @@
+#include "sys/types.h"
+#include <fcntl.h>
+#include "errno.h"
+#include "stdarg.h"
+#include "nonstd/types.h"
+#include "nonstd/syscall.h"
+
+int fcntl(int fildes, int cmd, ...)
+{
+	SCNO(scno, "fcntl", -1);
+
+	int r = -ENOSYS;
+	enum { NONE, INT, FLOCK } arg = NONE;
+
+	switch (cmd) {
+	case F_GETFD:
+	case F_GETFL:
+		break;
+
+	case F_DUPFD:
+	case F_SETFD:
+	case F_SETFL:
+		arg = INT;
+		break;
+
+	case F_GETLK:
+	case F_SETLK:
+	case F_SETLKW:
+		arg = FLOCK;
+		break;
+
+	default:
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (arg == NONE) {
+		r = __libc.syscall(scno, fildes);
+	} else {
+		va_list ap;
+		va_start(ap, cmd);
+		if (arg == INT) {
+			int n = va_arg(ap, int);
+			r = __libc.syscall(scno, fildes, n);
+		} else if (arg == FLOCK) {
+			struct flock *fl = va_arg(ap, struct flock *);
+			r = __libc.syscall(scno, fildes, fl);
+		}
+		va_end(ap);
+	}
+
+	if (r < 0) {
+		errno = -r;
+		return -1;
+	}
+
+	return r;
+}
+/*
+POSIX(1)
+*/