add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/tty/pty.c
..
..
@@ -29,6 +29,7 @@
29
29
 #include <linux/file.h>
30
30
 #include <linux/ioctl.h>
31
31
 #include <linux/compat.h>
32
+#include "tty.h"
32
33
 
33
34
 #undef TTY_DEBUG_HANGUP
34
35
 #ifdef TTY_DEBUG_HANGUP
..
..
@@ -100,7 +101,7 @@
100
101
  *	pty_write		-	write to a pty
101
102
  *	@tty: the tty we write from
102
103
  *	@buf: kernel buffer of data
103
- *	@count: bytes to write
104
+ *	@c: bytes to write
104
105
  *
105
106
  *	Our "hardware" write method. Data is coming from the ldisc which
106
107
  *	may be in a non sleeping state. We simply throw this at the other
..
..
@@ -111,21 +112,11 @@
111
112
 static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
112
113
 {
113
114
 	struct tty_struct *to = tty->link;
114
-	unsigned long flags;
115
115
 
116
-	if (tty->stopped)
116
+	if (tty->stopped || !c)
117
117
 		return 0;
118
118
 
119
-	if (c > 0) {
120
-		spin_lock_irqsave(&to->port->lock, flags);
121
-		/* Stuff the data into the input queue of the other end */
122
-		c = tty_insert_flip_string(to->port, buf, c);
123
-		spin_unlock_irqrestore(&to->port->lock, flags);
124
-		/* And shovel */
125
-		if (c)
126
-			tty_flip_buffer_push(to->port);
127
-	}
128
-	return c;
119
+	return tty_insert_flip_string_and_push_buffer(to->port, buf, c);
129
120
 }
130
121
 
131
122
 /**