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#if !defined(lint) && !defined(DOS)
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static char rcsid[] = "$Id: read.c 308 2006-12-08 20:14:42Z hubert@u.washington.edu $";
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* ========================================================================
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* Copyright 2006 University of Washington
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* ========================================================================
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* Keyboard input test and read functions
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#include <system.h> /* os-dep defs/includes */
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#include <general.h> /* generally useful definitions */
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#include "../keydefs.h"
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#endif /* !_WINDOWS */
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static time_t _time_of_last_input;
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time_of_last_input(void)
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if(_time_of_last_input == 0)
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_time_of_last_input = time((time_t *) 0);
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return(_time_of_last_input);
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#ifdef HAVE_SYS_SELECT_H
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# include <sys/select.h>
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* Check whether or not a character is ready to be read, or time out.
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* This version uses a select call.
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* Args: time_out -- number of seconds before it will time out.
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* Result: NO_OP_IDLE: timed out before any chars ready, time_out > 25
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* NO_OP_COMMAND: timed out before any chars ready, time_out <= 25
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* READ_INTR: read was interrupted
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* READY_TO_READ: input is available
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* BAIL_OUT: reading input failed, time to bail gracefully
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* PANIC_NOW: system call error, die now
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input_ready(int time_out)
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fd_set readfds, errfds;
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/* Check to see if there are bytes to read with a timeout */
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FD_SET(STDIN_FD, &readfds);
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FD_SET(STDIN_FD, &errfds);
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tmo.tv_sec = time_out;
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res = select(STDIN_FD+1, &readfds, 0, &errfds, &tmo);
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if(errno == EINTR || errno == EAGAIN)
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if(res == 0){ /* the select timed out */
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* "15" is the minimum allowed mail check interval.
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* Anything less, and we're being told to cycle thru
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* the command loop because some task is pending...
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return(time_out < IDLE_TIMEOUT ? NO_OP_COMMAND : NO_OP_IDLE);
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_time_of_last_input = time((time_t *) 0);
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return(READY_TO_READ);
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#ifdef HAVE_STROPTS_H
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# include <stropts.h>
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#ifdef HAVE_SYS_POLL_H
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* Check whether or not a character is ready to be read, or time out.
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* This version uses a poll call.
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* Args: time_out -- number of seconds before it will time out.
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* Result: NO_OP_IDLE: timed out before any chars ready, time_out > 25
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* NO_OP_COMMAND: timed out before any chars ready, time_out <= 25
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* READ_INTR: read was interrupted
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* READY_TO_READ: input is available
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* BAIL_OUT: reading input failed, time to bail gracefully
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* PANIC_NOW: system call error, die now
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input_ready(int time_out)
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struct pollfd pollfd;
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/* Check to see if there are bytes to read with a timeout */
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pollfd.fd = STDIN_FD;
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pollfd.events = POLLIN;
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res = poll (&pollfd, 1, time_out * 1000);
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if(res >= 0){ /* status bits OK? */
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if(pollfd.revents & (POLLERR | POLLNVAL))
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res = -1; /* bad news, exit below! */
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else if(pollfd.revents & POLLHUP)
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if(errno == EINTR || errno == EAGAIN)
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if(res == 0){ /* the select timed out */
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/* Parent is init! */
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* "15" is the minimum allowed mail check interval.
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* Anything less, and we're being told to cycle thru
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* the command loop because some task is pending...
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return(time_out < IDLE_TIMEOUT ? NO_OP_COMMAND : NO_OP_IDLE);
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_time_of_last_input = time((time_t *) 0);
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return(READY_TO_READ);
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#endif /* HAVE_POLL */
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* Read one character from STDIN.
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* Result: -- the single character read
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* READ_INTR -- read was interrupted
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* BAIL_OUT -- read error of some sort
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res = read(STDIN_FD, &c, 1);
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* Error reading from terminal!
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* The only acceptable failure is being interrupted. If so,
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* return a value indicating such...
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if(res < 0 && errno == EINTR)
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set_time_of_last_input(void)
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_time_of_last_input = time(0L);
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#endif /* _WINDOWS */
added
removed
pico/osdep/read.c
