From 661977b6f44652cf7d14c38e4b888c51e399cdd4 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Sat, 15 Aug 2020 12:33:24 -0400
Subject: sadly Linux-specific implementation

---
 src/termios/_termios.h    | 61 +++++++++++++++++++++++++++++++++++++++++++++++
 src/termios/tcdrain.c     |  3 ++-
 src/termios/tcflow.c      |  4 ++--
 src/termios/tcflush.c     |  5 ++--
 src/termios/tcgetattr.c   | 10 ++++++--
 src/termios/tcgetsid.c    |  7 +++++-
 src/termios/tcsendbreak.c |  4 ++--
 src/termios/tcsetattr.c   | 28 ++++++++++++++++++++--
 8 files changed, 110 insertions(+), 12 deletions(-)
 create mode 100644 src/termios/_termios.h

(limited to 'src')

diff --git a/src/termios/_termios.h b/src/termios/_termios.h
new file mode 100644
index 00000000..ce35d32e
--- /dev/null
+++ b/src/termios/_termios.h
@@ -0,0 +1,61 @@
+#ifndef ___TERMIOS_H__
+#define ___TERMIOS_H__
+
+#include <termios.h>
+#include <string.h>
+
+#ifdef __linux__
+#include "_syscall.h"
+
+#define KNCCS 19
+#define MINCCS (KNCCS < NCCS ? KNCCS : NCCS)
+
+#define TCGETS		0x5401
+#define TCSETS		0x5402
+#define TCSETSW		0x5403
+#define TCSETSF		0x5404
+#define TCSBRK		0x5409
+#define TCSBRKP		0x5425
+#define TCXONC		0x540A
+#define TCFLSH		0x540B
+#define TIOCGPGRP	0x540F
+
+#define ioctl(_fd, _cmd, _arg) __syscall(16, _fd, _cmd, _arg)
+
+struct kernel_termios {
+	tcflag_t c_iflag;
+	tcflag_t c_oflag;
+	tcflag_t c_cflag;
+	tcflag_t c_lflag;
+	cc_t c_line;
+	cc_t c_cc[KNCCS];
+	speed_t c_ispeed;
+	speed_t c_ospeed;
+};
+
+#define ktou(_u, _k) do { \
+	(_u).c_iflag = (_k).c_iflag; \
+	(_u).c_oflag = (_k).c_oflag; \
+	(_u).c_cflag = (_k).c_cflag; \
+	(_u).c_lflag = (_k).c_lflag; \
+	memcpy((_u).c_cc, (_k).c_cc, MINCCS); \
+} while (0)
+	/* and the speeds */
+
+#define utok(_k, _u) do { \
+	(_k).c_iflag = (_u).c_iflag; \
+	(_k).c_oflag = (_u).c_oflag; \
+	(_k).c_cflag = (_u).c_cflag; \
+	(_k).c_lflag = (_u).c_lflag; \
+	(_k).c_line = 0; \
+	memcpy((_k).c_cc, (_u).c_cc, MINCCS); \
+} while (0)
+	/* and the speeds */
+
+#else
+#define kernel_termios termios
+#define ktou(_u, _k) (memcpy(_u, _k, sizeof(_u))
+#define utok(_k, _u) (memcpy(_k, _u, sizeof(_u))
+#endif
+
+#endif
diff --git a/src/termios/tcdrain.c b/src/termios/tcdrain.c
index a0963b83..8f117ac1 100644
--- a/src/termios/tcdrain.c
+++ b/src/termios/tcdrain.c
@@ -1,8 +1,9 @@
 #include <termios.h>
+#include "_termios.h"
 
 int tcdrain(int fildes)
 {
-	return fildes;
+	return ioctl(fildes, TCSBRK, 1);
 }
 /*
 POSIX(1)
diff --git a/src/termios/tcflow.c b/src/termios/tcflow.c
index 05898373..41fdcfbc 100644
--- a/src/termios/tcflow.c
+++ b/src/termios/tcflow.c
@@ -1,9 +1,9 @@
 #include <termios.h>
+#include "_termios.h"
 
 int tcflow(int fildes, int action)
 {
-	(void)fildes;
-	return action;
+	return ioctl(fildes, TCXONC, action);
 }
 
 /*
diff --git a/src/termios/tcflush.c b/src/termios/tcflush.c
index 28933528..98a89749 100644
--- a/src/termios/tcflush.c
+++ b/src/termios/tcflush.c
@@ -1,10 +1,11 @@
 #include <termios.h>
+#include "_termios.h"
 
 int tcflush(int fildes, int queue_selector)
 {
-	(void)queue_selector;
-	return fildes;
+	return ioctl(fildes, TCFLSH, queue_selector);
 }
+
 /*
 POSIX(1)
 */
diff --git a/src/termios/tcgetattr.c b/src/termios/tcgetattr.c
index f9ebe024..0f74be5c 100644
--- a/src/termios/tcgetattr.c
+++ b/src/termios/tcgetattr.c
@@ -1,10 +1,16 @@
 #include <termios.h>
+#include "_termios.h"
 
 int tcgetattr(int fildes, struct termios *termios_p)
 {
-	(void)termios_p;
-	return fildes;
+	int ret = -1;
+	struct kernel_termios kt;
+	utok(kt, *termios_p);
+	ret = ioctl(fildes, TCGETS, &kt);
+	ktou(*termios_p, kt);
+	return ret;
 }
+
 /*
 POSIX(1)
 */
diff --git a/src/termios/tcgetsid.c b/src/termios/tcgetsid.c
index 8b095363..2ebfb425 100644
--- a/src/termios/tcgetsid.c
+++ b/src/termios/tcgetsid.c
@@ -1,8 +1,13 @@
+#include "sys/types.h"
 #include <termios.h>
 
 pid_t tcgetsid(int fildes)
 {
-	return 0;
+	pid_t pid = -1;
+	if (ioctl(fildes, TIOCGPGRP, &pid) == -1) {
+		return (pid_t)-1;
+	}
+	return pid;
 }
 
 /*
diff --git a/src/termios/tcsendbreak.c b/src/termios/tcsendbreak.c
index 7c728aa3..fab5927e 100644
--- a/src/termios/tcsendbreak.c
+++ b/src/termios/tcsendbreak.c
@@ -1,9 +1,9 @@
 #include <termios.h>
+#include "_termios.h"
 
 int tcsendbreak(int fildes, int duration)
 {
-	(void)duration;
-	return fildes;
+	return ioctl(fildes, TCSBRKP, duration);
 }
 /*
 POSIX(1)
diff --git a/src/termios/tcsetattr.c b/src/termios/tcsetattr.c
index b68652ad..a40439a2 100644
--- a/src/termios/tcsetattr.c
+++ b/src/termios/tcsetattr.c
@@ -1,9 +1,33 @@
 #include <termios.h>
+#include <errno.h>
+#include "_termios.h"
 
 int tcsetattr(int fildes, int optional_actions, struct termios *termios_p)
 {
-	(void)optional_actions; (void)termios_p;
-	return fildes;
+	int ret = -1;
+	struct kernel_termios kt;
+	utok(kt, *termios_p);
+
+	switch (optional_actions) {
+	case TCSANOW:
+		ret = ioctl(fildes, TCSETS, &kt);
+		break;
+
+	case TCSADRAIN:
+		ret = ioctl(fildes, TCSETSW, &kt);
+		break;
+
+	case TCSAFLUSH:
+		ret = ioctl(fildes, TCSETSF, &kt);
+		break;
+
+	default:
+		errno = EINVAL;
+		return -1;
+	}
+
+	ktou(*termios_p, kt);
+	return ret;
 }
 /*
 POSIX(1)
-- 
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