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Diffstat (limited to 'pico/osdep/read.c')
| -rw-r--r-- | pico/osdep/read.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/pico/osdep/read.c b/pico/osdep/read.c new file mode 100644 index 00000000..52fe92e5 --- /dev/null +++ b/pico/osdep/read.c @@ -0,0 +1,223 @@ +#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 */ |