Magisk/pts.h
2017-04-15 03:21:31 +08:00

107 lines
2.3 KiB
C

/*
* Copyright 2013, Tan Chee Eng (@tan-ce)
*/
/*
* pts.h
*
* Manages the pseudo-terminal driver on Linux/Android and provides some
* helper functions to handle raw input mode and terminal window resizing
*/
#ifndef _PTS_H_
#define _PTS_H_
#include <sys/types.h>
/**
* pts_open
*
* Opens a pts device and returns the name of the slave tty device.
*
* Arguments
* slave_name the name of the slave device
* slave_name_size the size of the buffer passed via slave_name
*
* Return Values
* on failure either -2 or -1 (errno set) is returned.
* on success, the file descriptor of the master device is returned.
*/
int pts_open(char *slave_name, size_t slave_name_size);
/**
* set_stdin_raw
*
* Changes stdin to raw unbuffered mode, disables echo,
* auto carriage return, etc.
*
* Return Value
* on failure -1, and errno is set
* on success 0
*/
int set_stdin_raw(void);
/**
* restore_stdin
*
* Restore termios on stdin to the state it was before
* set_stdin_raw() was called. If set_stdin_raw() was
* never called, does nothing and doesn't return an error.
*
* This function is async-safe.
*
* Return Value
* on failure, -1 and errno is set
* on success, 0
*/
int restore_stdin(void);
/**
* watch_sigwinch_async
*
* After calling this function, if the application receives
* SIGWINCH, the terminal window size will be read from
* "input" and set on "output".
*
* NOTE: This function blocks SIGWINCH and spawns a thread.
*
* Arguments
* master A file descriptor of the TTY window size to follow
* slave A file descriptor of the TTY window size which is
* to be set on SIGWINCH
*
* Return Value
* on failure, -1 and errno will be set. In this case, no
* thread has been spawned and SIGWINCH will not be
* blocked.
* on success, 0
*/
int watch_sigwinch_async(int master, int slave);
/**
* watch_sigwinch_cleanup
*
* Cause the SIGWINCH watcher thread to terminate
*/
void watch_sigwinch_cleanup(void);
/**
* pump_stdin_async
*
* Forward data from STDIN to the given FD
* in a seperate thread
*/
void pump_stdin_async(int outfd);
/**
* pump_stdout_blocking
*
* Forward data from the FD to STDOUT.
* Returns when the remote end of the FD closes.
*
* Before returning, restores stdin settings.
*/
void pump_stdout_blocking(int infd);
#endif