Add build system scaffolding and libc headers

6 files changed, 98 insertions, 0 deletions

diff --git a/lib/libc/fcntl/creat.c b/lib/libc/fcntl/creat.c
new file mode 100644
index 00000000..fdcb6655
--- /dev/null
+++ b/lib/libc/fcntl/creat.c
@@ -0,0 +1,7 @@
+#include <fcntl.h>
+#include <syscall.h>
+
+int creat(const char *path, mode_t mode)
+{
+	return syscall(creat, path, mode);
+}
diff --git a/lib/libc/fcntl/fcntl.c b/lib/libc/fcntl/fcntl.c
new file mode 100644
index 00000000..ae213df5
--- /dev/null
+++ b/lib/libc/fcntl/fcntl.c
@@ -0,0 +1,37 @@
+#include <fcntl.h>
+#include <stdarg.h>
+#include <syscall.h>
+
+int fcntl(int fildes, int cmd, ...)
+{
+	unsigned long arg;
+	va_list ap;
+	va_start(ap, cmd);
+	arg = va_arg(ap, unsigned long);
+	va_end(ap);
+
+	if (cmd == F_DUPFD_CLOEXEC) {
+		int ret = syscall(fcntl, fildes, F_DUPFD_CLOEXEC, arg);
+		if (ret != -EINVAL) {
+			if (ret >= 0)
+				syscall(fcntl, ret, F_SETFD, FD_CLOEXEC);
+			return __syscall_ret(ret);
+		}
+
+		ret = syscall(fcntl, fildes, F_DUPFD_CLOEXEC, 0);
+		if (ret != -EINVAL) {
+			if (ret >= 0)
+				__syscall(close, ret);
+
+			return __syscall_ret(-EINVAL);
+		}
+
+		ret = syscall(fcntl, fildes, F_DUPFD, arg);
+		if (ret >= 0)
+			syscall(fcntl, ret, F_SETFD, FD_CLOEXEC);
+
+		return __syscall_ret(ret);
+	}
+
+	return syscall(fcntl, fildes, cmd);
+}
diff --git a/lib/libc/fcntl/open.c b/lib/libc/fcntl/open.c
new file mode 100644
index 00000000..dbdff8f9
--- /dev/null
+++ b/lib/libc/fcntl/open.c
@@ -0,0 +1,23 @@
+#include <fcntl.h>
+#include <stdarg.h>
+#include <syscall.h>
+
+int open(const char *path, int oflag, ...)
+{
+	long ret;
+	mode_t mode = 0;
+
+	if ((oflag & O_CREAT)) {
+		va_list ap;
+		va_start(ap, oflag);
+		mode = va_arg(ap, mode_t);
+		va_end(ap);
+	}
+
+	ret = syscall(open, path, oflag, mode);
+
+	if (ret >= 0 && (oflag & O_CLOEXEC))
+		return syscall(fcntl, ret, F_SETFD, FD_CLOEXEC);
+
+	return ret;
+}
diff --git a/lib/libc/fcntl/openat.c b/lib/libc/fcntl/openat.c
new file mode 100644
index 00000000..bb34d600
--- /dev/null
+++ b/lib/libc/fcntl/openat.c
@@ -0,0 +1,17 @@
+#include <fcntl.h>
+#include <stdarg.h>
+#include <syscall.h>
+
+int openat(int fd, const char *path, int oflag, ...)
+{
+	mode_t mode = 0;
+
+	if (oflag & O_CREAT) {
+		va_list ap;
+		va_start(ap, oflag);
+		mode = va_arg(ap, mode_t);
+		va_end(ap);
+	}
+
+	return syscall(openat, fd, path, oflag, mode);
+}
diff --git a/lib/libc/fcntl/posix_fadvise.c b/lib/libc/fcntl/posix_fadvise.c
new file mode 100644
index 00000000..dcf278fd
--- /dev/null
+++ b/lib/libc/fcntl/posix_fadvise.c
@@ -0,0 +1,7 @@
+#include <fcntl.h>
+#include <syscall.h>
+
+int posix_fadvise(int fd, off_t offset, off_t len, int advice)
+{
+	return syscall(fadvise64, fd, offset, len, advice);
+}
diff --git a/lib/libc/fcntl/posix_fallocate.c b/lib/libc/fcntl/posix_fallocate.c
new file mode 100644
index 00000000..221f2d38
--- /dev/null
+++ b/lib/libc/fcntl/posix_fallocate.c
@@ -0,0 +1,7 @@
+#include <fcntl.h>
+#include <syscall.h>
+
+int posix_fallocate(int fd, off_t offset, off_t len)
+{
+	return syscall(fallocate, fd, 0, offset, len);
+}