1 files changed, 38 insertions, 0 deletions
diff --git a/nonstd/syscall.h b/nonstd/syscall.h
new file mode 100644
index 00000000..e77ceeaa
--- /dev/null
+++ b/nonstd/syscall.h
@@ -0,0 +1,38 @@
+#ifndef __NONSTD_SYSCALL_H__
+#define __NONSTD_SYSCALL_H__
+
+#include <errno.h>
+#include "nonstd/types.h"
+
+#ifndef ENOSYS
+#define ENOSYS 10
+#endif
+
+#define SCNO(_var, _name, _notfound) static int _var = -2; do { \
+	if ((_var) == -2) { (_var) = __libc.syscall_lookup((_name)); } \
+	if ((_var) == -1) { errno = ENOSYS; return (_notfound); } \
+	} while (0)
+
+#define SCNOFAIL() static int _scno = -2; \
+	if (_scno == -2) { _scno = __libc.syscall_lookup(__func__); } \
+	return __libc.syscall(_scno)
+
+#define SC(_type, ...) static int _scno = -2; \
+	if (_scno == -2) { _scno = __libc.syscall_lookup(__func__); } \
+	_type _ret = __libc.syscall(_scno, __VA_ARGS__); \
+	if (_ret < 0) { \
+		errno = -_ret; \
+		return -1; \
+	} \
+	return _ret
+
+#define SC0(_type) static int _scno = -2; \
+	if (_scno == -2) { _scno = __libc.syscall_lookup(__func__); } \
+	_type __ret = __libc.syscall(_scno); \
+	if (_ret < 0) { \
+		errno = -_ret; \
+		return -1; \
+	} \
+	return _ret
+
+#endif