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#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: read.c 763 2007-10-23 23:37:34Z hubert@u.washington.edu $";
#endif
/*
* ========================================================================
* Copyright 2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
/*
* Keyboard input test and read functions
*/
#include <system.h> /* os-dep defs/includes */
#include <general.h> /* generally useful definitions */
#include "../keydefs.h"
#ifndef _WINDOWS
#include "raw.h"
#endif /* !_WINDOWS */
#include "read.h"
static time_t _time_of_last_input;
time_t
time_of_last_input(void)
{
if(_time_of_last_input == 0)
_time_of_last_input = time((time_t *) 0);
return(_time_of_last_input);
}
#ifndef _WINDOWS
#if HAVE_SELECT
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
/*
* Check whether or not a character is ready to be read, or time out.
* This version uses a select call.
*
* Args: time_out -- number of seconds before it will time out.
*
* Result: NO_OP_IDLE: timed out before any chars ready, time_out > 25
* NO_OP_COMMAND: timed out before any chars ready, time_out <= 25
* READ_INTR: read was interrupted
* READY_TO_READ: input is available
* BAIL_OUT: reading input failed, time to bail gracefully
* PANIC_NOW: system call error, die now
*/
UCS
input_ready(int time_out)
{
struct timeval tmo;
fd_set readfds, errfds;
int res;
fflush(stdout);
if(time_out > 0){
/* Check to see if there are bytes to read with a timeout */
FD_ZERO(&readfds);
FD_ZERO(&errfds);
FD_SET(STDIN_FD, &readfds);
FD_SET(STDIN_FD, &errfds);
tmo.tv_sec = time_out;
tmo.tv_usec = 0;
res = select(STDIN_FD+1, &readfds, 0, &errfds, &tmo);
if(res < 0){
if(errno == EINTR || errno == EAGAIN)
return(READ_INTR);
return(BAIL_OUT);
}
if(res == 0){ /* the select timed out */
#ifndef __CYGWIN__
if(getppid() == 1){
/* Parent is init! */
return(BAIL_OUT);
}
#endif
/*
* "15" is the minimum allowed mail check interval.
* Anything less, and we're being told to cycle thru
* the command loop because some task is pending...
*/
return(time_out < IDLE_TIMEOUT ? NO_OP_COMMAND : NO_OP_IDLE);
}
}
_time_of_last_input = time((time_t *) 0);
return(READY_TO_READ);
}
#elif HAVE_POLL
#ifdef HAVE_STROPTS_H
# include <stropts.h>
#endif
#ifdef HAVE_SYS_POLL_H
# include <poll.h>
#endif
/*
* Check whether or not a character is ready to be read, or time out.
* This version uses a poll call.
*
* Args: time_out -- number of seconds before it will time out.
*
* Result: NO_OP_IDLE: timed out before any chars ready, time_out > 25
* NO_OP_COMMAND: timed out before any chars ready, time_out <= 25
* READ_INTR: read was interrupted
* READY_TO_READ: input is available
* BAIL_OUT: reading input failed, time to bail gracefully
* PANIC_NOW: system call error, die now
*/
UCS
input_ready(int time_out)
{
struct pollfd pollfd;
int res;
fflush(stdout);
if(time_out > 0){
/* Check to see if there are bytes to read with a timeout */
pollfd.fd = STDIN_FD;
pollfd.events = POLLIN;
res = poll (&pollfd, 1, time_out * 1000);
if(res >= 0){ /* status bits OK? */
if(pollfd.revents & (POLLERR | POLLNVAL))
res = -1; /* bad news, exit below! */
else if(pollfd.revents & POLLHUP)
return(BAIL_OUT);
}
if(res < 0){
if(errno == EINTR || errno == EAGAIN)
return(READ_INTR);
return(PANIC_NOW);
}
if(res == 0){ /* the select timed out */
if(getppid() == 1){
/* Parent is init! */
return(BAIL_OUT);
}
/*
* "15" is the minimum allowed mail check interval.
* Anything less, and we're being told to cycle thru
* the command loop because some task is pending...
*/
return(time_out < IDLE_TIMEOUT ? NO_OP_COMMAND : NO_OP_IDLE);
}
}
_time_of_last_input = time((time_t *) 0);
return(READY_TO_READ);
}
#endif /* HAVE_POLL */
/*
* Read one character from STDIN.
*
* Result: -- the single character read
* READ_INTR -- read was interrupted
* BAIL_OUT -- read error of some sort
*/
int
read_one_char(void)
{
int res;
unsigned char c;
res = read(STDIN_FD, &c, 1);
if(res <= 0){
/*
* Error reading from terminal!
* The only acceptable failure is being interrupted. If so,
* return a value indicating such...
*/
if(res < 0 && errno == EINTR)
return(READ_INTR);
else
return(BAIL_OUT);
}
return((int)c);
}
#else /* _WINDOWS */
int
set_time_of_last_input(void)
{
_time_of_last_input = time(0L);
return(0);
}
#endif /* _WINDOWS */
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