Add build system scaffolding and libc headers

13 files changed, 139 insertions, 0 deletions

diff --git a/lib/libc/termios/cfgetispeed.c b/lib/libc/termios/cfgetispeed.c
new file mode 100644
index 00000000..f06ec65e
--- /dev/null
+++ b/lib/libc/termios/cfgetispeed.c
@@ -0,0 +1,6 @@
+#include <asm-generic/termbits.h>
+
+speed_t cfgetispeed(const struct termios *termios_p)
+{
+	return (termios_p->c_cflag & CIBAUD) / (CIBAUD / CBAUD);
+}
diff --git a/lib/libc/termios/cfgetospeed.c b/lib/libc/termios/cfgetospeed.c
new file mode 100644
index 00000000..e36befc3
--- /dev/null
+++ b/lib/libc/termios/cfgetospeed.c
@@ -0,0 +1,6 @@
+#include <asm-generic/termbits.h>
+
+speed_t cfgetospeed(const struct termios *termios_p)
+{
+	return termios_p->c_cflag & CBAUD;
+}
diff --git a/lib/libc/termios/cfsetispeed.c b/lib/libc/termios/cfsetispeed.c
new file mode 100644
index 00000000..b990d598
--- /dev/null
+++ b/lib/libc/termios/cfsetispeed.c
@@ -0,0 +1,14 @@
+#include <errno.h>
+#include <asm-generic/termbits.h>
+
+int cfsetispeed(struct termios *termios_p, speed_t speed)
+{
+	if (speed & ~CBAUD) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	termios_p->c_cflag &= ~CIBAUD;
+	termios_p->c_cflag |= speed * (CIBAUD / CBAUD);
+	return 0;
+}
diff --git a/lib/libc/termios/cfsetospeed.c b/lib/libc/termios/cfsetospeed.c
new file mode 100644
index 00000000..3f46b5c4
--- /dev/null
+++ b/lib/libc/termios/cfsetospeed.c
@@ -0,0 +1,13 @@
+#include <errno.h>
+#include <asm-generic/termbits.h>
+
+int cfsetospeed(struct termios *termios_p, speed_t speed)
+{
+	if (speed & ~CBAUD) {
+		errno = EINVAL;
+		return -1;
+	}
+	termios_p->c_cflag &= ~CBAUD;
+	termios_p->c_cflag |= speed;
+	return 0;
+}
diff --git a/lib/libc/termios/tcdrain.c b/lib/libc/termios/tcdrain.c
new file mode 100644
index 00000000..9eefedf2
--- /dev/null
+++ b/lib/libc/termios/tcdrain.c
@@ -0,0 +1,7 @@
+#include <asm-generic/ioctls.h>
+#include <syscall.h>
+
+int tcdrain(int fildes)
+{
+	return syscall(ioctl, fildes, TCSBRK, 1);
+}
diff --git a/lib/libc/termios/tcflow.c b/lib/libc/termios/tcflow.c
new file mode 100644
index 00000000..a10455d1
--- /dev/null
+++ b/lib/libc/termios/tcflow.c
@@ -0,0 +1,7 @@
+#include <asm-generic/ioctls.h>
+#include <syscall.h>
+
+int tcflow(int fildes, int action)
+{
+	return syscall(ioctl, fildes, TCXONC, action);
+}
diff --git a/lib/libc/termios/tcflush.c b/lib/libc/termios/tcflush.c
new file mode 100644
index 00000000..b37b218d
--- /dev/null
+++ b/lib/libc/termios/tcflush.c
@@ -0,0 +1,8 @@
+#include <termios.h>
+#include <syscall.h>
+#include <asm-generic/ioctls.h>
+
+int tcflush(int fildes, int queue_selector)
+{
+	return syscall(ioctl, fildes, TCFLSH, queue_selector);
+}
diff --git a/lib/libc/termios/tcgetattr.c b/lib/libc/termios/tcgetattr.c
new file mode 100644
index 00000000..a52eeedf
--- /dev/null
+++ b/lib/libc/termios/tcgetattr.c
@@ -0,0 +1,9 @@
+#include <termios.h>
+#include <syscall.h>
+#include <asm-generic/ioctls.h>
+
+int tcgetattr(int fildes, struct termios *termios_p)
+
+{
+	return syscall(ioctl, fildes, TCGETS, termios_p);
+}
diff --git a/lib/libc/termios/tcgetsid.c b/lib/libc/termios/tcgetsid.c
new file mode 100644
index 00000000..076cf360
--- /dev/null
+++ b/lib/libc/termios/tcgetsid.c
@@ -0,0 +1,13 @@
+#include <termios.h>
+#include <syscall.h>
+#include <asm-generic/ioctls.h>
+
+pid_t tcgetsid(int fildes)
+{
+	pid_t sid = 0;
+
+	if (syscall(ioctl, fildes, TIOCGSID, &sid) < 0)
+		return -1;
+
+	return sid;
+}
diff --git a/lib/libc/termios/tcgetwinsize.c b/lib/libc/termios/tcgetwinsize.c
new file mode 100644
index 00000000..2c7c5786
--- /dev/null
+++ b/lib/libc/termios/tcgetwinsize.c
@@ -0,0 +1,23 @@
+#include <termios.h>
+#include <syscall.h>
+#include <asm-generic/ioctls.h>
+
+struct __winsize {
+	unsigned short ws_row;
+	unsigned short ws_col;
+	unsigned short ws_xpixel;
+	unsigned short ws_ypixel;
+};
+
+int tcgetwinsize(int fildes, struct winsize *winsize_p)
+{
+	long ret;
+	struct __winsize winsize = { 0 };
+
+	ret = syscall(ioctl, fildes, TIOCGWINSZ, &winsize);
+
+	winsize_p->ws_row = winsize.ws_row;
+	winsize_p->ws_col = winsize.ws_col;
+
+	return ret;
+}
diff --git a/lib/libc/termios/tcsendbreak.c b/lib/libc/termios/tcsendbreak.c
new file mode 100644
index 00000000..a6ed420d
--- /dev/null
+++ b/lib/libc/termios/tcsendbreak.c
@@ -0,0 +1,11 @@
+#include <termios.h>
+#include <syscall.h>
+#include <asm-generic/ioctls.h>
+
+int tcsendbreak(int fildes, int duration)
+{
+	// IEEE Std 1003.1-2024
+	// If duration is not 0, it shall send zero-valued
+	// bits for an implementation-defined period of time.
+	return syscall(ioctl, fildes, TCSBRK, 0);
+}
diff --git a/lib/libc/termios/tcsetattr.c b/lib/libc/termios/tcsetattr.c
new file mode 100644
index 00000000..a76e77a5
--- /dev/null
+++ b/lib/libc/termios/tcsetattr.c
@@ -0,0 +1,14 @@
+#include <termios.h>
+#include <syscall.h>
+#include <asm-generic/ioctls.h>
+#include <errno.h>
+
+int tcsetattr(int fildes, int optional_actions, const struct termios *termios_p)
+{
+	if (optional_actions < 0 || optional_actions > 2) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	return syscall(ioctl, fildes, TCSETS + optional_actions, termios_p);
+}
diff --git a/lib/libc/termios/tcsetwinsize.c b/lib/libc/termios/tcsetwinsize.c
new file mode 100644
index 00000000..10a705d0
--- /dev/null
+++ b/lib/libc/termios/tcsetwinsize.c
@@ -0,0 +1,8 @@
+#include <termios.h>
+#include <syscall.h>
+#include <asm-generic/ioctls.h>
+
+int tcsetwinsize(int fildes, const struct winsize *winsize_p)
+{
+	return syscall(ioctl, fildes, TIOCSWINSZ, winsize_p);
+}