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发表于 2007-10-18 13:14:40
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- /* beep - just what it sounds like, makes the console beep - but with
- * precision control. See the man page for details.
- *
- * Try beep -h for command line args
- *
- * This code is copyright (C) Johnathan Nightingale, 2000.
- *
- * This code may distributed only under the terms of the GNU Public License
- * which can be found at http://www.gnu.org/copyleft or in the file COPYING
- * supplied with this code.
- *
- * This code is not distributed with warranties of any kind, including implied
- * warranties of merchantability or fitness for a particular use or ability to
- * breed pandas in captivity, it just can't be done.
- *
- * Bug me, I like it: http://johnath.com/ or johnath@johnath.com
- */
- #include <fcntl.h>
- #include <getopt.h>
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/ioctl.h>
- #include <sys/types.h>
- #include <linux/kd.h>
- /* I don't know where this number comes from, I admit that freely. A
- wonderful human named Raine M. Ekman used it in a program that played
- a tune at the console, and apparently, it's how the kernel likes its
- sound requests to be phrased. If you see Raine, thank him for me.
-
- June 28, email from Peter Tirsek (peter at tirsek dot com):
-
- This number represents the fixed frequency of the original PC XT's
- timer chip (the 8254 AFAIR), which is approximately 1.193 MHz. This
- number is divided with the desired frequency to obtain a counter value,
- that is subsequently fed into the timer chip, tied to the PC speaker.
- The chip decreases this counter at every tick (1.193 MHz) and when it
- reaches zero, it toggles the state of the speaker (on/off, or in/out),
- resets the counter to the original value, and starts over. The end
- result of this is a tone at approximately the desired frequency. :)
- */
- #ifndef CLOCK_TICK_RATE
- #define CLOCK_TICK_RATE 1193180
- #endif
- #define VERSION_STRING "beep-1.2.2"
- char *copyright =
- "Copyright (C) Johnathan Nightingale, 2002. "
- "Use and Distribution subject to GPL. "
- "For information: http://www.gnu.org/copyleft/.";
- /* Meaningful Defaults */
- #define DEFAULT_FREQ 440.0 /* Middle A */
- #define DEFAULT_LENGTH 200 /* milliseconds */
- #define DEFAULT_REPS 1
- #define DEFAULT_DELAY 100 /* milliseconds */
- #define DEFAULT_END_DELAY NO_END_DELAY
- #define DEFAULT_STDIN_BEEP NO_STDIN_BEEP
- /* Other Constants */
- #define NO_END_DELAY 0
- #define YES_END_DELAY 1
- #define NO_STDIN_BEEP 0
- #define LINE_STDIN_BEEP 1
- #define CHAR_STDIN_BEEP 2
- typedef struct beep_parms_t {
- float freq; /* tone frequency (Hz) */
- int length; /* tone length (ms) */
- int reps; /* # of repetitions */
- int delay; /* delay between reps (ms) */
- int end_delay; /* do we delay after last rep? */
- int stdin_beep; /* are we using stdin triggers? We have three options:
- - just beep and terminate (default)
- - beep after a line of input
- - beep after a character of input
- In the latter two cases, pass the text back out again,
- so that beep can be tucked appropriately into a text-
- processing pipe.
- */
- struct beep_parms_t *next; /* in case -n/--new is used. */
- } beep_parms_t;
- /* Momma taught me never to use globals, but we need something the signal
- handlers can get at.*/
- int console_fd = -1;
- /* If we get interrupted, it would be nice to not leave the speaker beeping in
- perpetuity. */
- void handle_signal(int signum) {
- switch(signum) {
- case SIGINT:
- if(console_fd >= 0) {
- /* Kill the sound, quit gracefully */
- ioctl(console_fd, KIOCSOUND, 0);
- close(console_fd);
- exit(signum);
- } else {
- /* Just quit gracefully */
- exit(signum);
- }
- }
- }
- /* print usage and exit */
- void usage_bail(const char *executable_name) {
- printf("Usage:\n%s [-f freq] [-l length] [-r reps] [-d delay] "
- "[-D delay] [-s] [-c]\n",
- executable_name);
- printf("%s [Options...] [-n] [--new] [Options...] ... \n", executable_name);
- printf("%s [-h] [--help]\n", executable_name);
- printf("%s [-v] [-V] [--version]\n", executable_name);
- exit(1);
- }
- /* Parse the command line. argv should be untampered, as passed to main.
- * Beep parameters returned in result, subsequent parameters in argv will over-
- * ride previous ones.
- *
- * Currently valid parameters:
- * "-f <frequency in Hz>"
- * "-l <tone length in ms>"
- * "-r <repetitions>"
- * "-d <delay in ms>"
- * "-D <delay in ms>" (similar to -d, but delay after last repetition as well)
- * "-s" (beep after each line of input from stdin, echo line to stdout)
- * "-c" (beep after each char of input from stdin, echo char to stdout)
- * "-h/--help"
- * "-v/-V/--version"
- * "-n/--new"
- *
- * March 29, 2002 - Daniel Eisenbud points out that c should be int, not char,
- * for correctness on platforms with unsigned chars.
- */
- void parse_command_line(int argc, char **argv, beep_parms_t *result) {
- int c;
- struct option opt_list[4] = {{"help", 0, NULL, 'h'},
- {"version", 0, NULL, 'V'},
- {"new", 0, NULL, 'n'},
- {0,0,0,0}};
- while((c = getopt_long(argc, argv, "f:l:r:d:D:schvVn", opt_list, NULL))
- != EOF) {
- int argval = -1; /* handle parsed numbers for various arguments */
- float argfreq = -1;
- switch(c) {
- case 'f': /* freq */
- if(!sscanf(optarg, "%f", &argfreq) || (argfreq >= 20000 /* ack! */) ||
- (argfreq <= 0))
- usage_bail(argv[0]);
- else
- result->freq = argfreq;
- break;
- case 'l' : /* length */
- if(!sscanf(optarg, "%d", &argval) || (argval < 0))
- usage_bail(argv[0]);
- else
- result->length = argval;
- break;
- case 'r' : /* repetitions */
- if(!sscanf(optarg, "%d", &argval) || (argval < 0))
- usage_bail(argv[0]);
- else
- result->reps = argval;
- break;
- case 'd' : /* delay between reps - WITHOUT delay after last beep*/
- if(!sscanf(optarg, "%d", &argval) || (argval < 0))
- usage_bail(argv[0]);
- else {
- result->delay = argval;
- result->end_delay = NO_END_DELAY;
- }
- break;
- case 'D' : /* delay between reps - WITH delay after last beep */
- if(!sscanf(optarg, "%d", &argval) || (argval < 0))
- usage_bail(argv[0]);
- else {
- result->delay = argval;
- result->end_delay = YES_END_DELAY;
- }
- break;
- case 's' :
- result->stdin_beep = LINE_STDIN_BEEP;
- break;
- case 'c' :
- result->stdin_beep = CHAR_STDIN_BEEP;
- break;
- case 'v' :
- case 'V' : /* also --version */
- printf("%s\n",VERSION_STRING);
- exit(0);
- break;
- case 'n' : /* also --new - create another beep */
- result->next = (beep_parms_t *)malloc(sizeof(beep_parms_t));
- result->next->freq = DEFAULT_FREQ;
- result->next->length = DEFAULT_LENGTH;
- result->next->reps = DEFAULT_REPS;
- result->next->delay = DEFAULT_DELAY;
- result->next->end_delay = DEFAULT_END_DELAY;
- result->next->stdin_beep = DEFAULT_STDIN_BEEP;
- result->next->next = NULL;
- result = result->next; /* yes, I meant to do that. */
- break;
- case 'h' : /* notice that this is also --help */
- default :
- usage_bail(argv[0]);
- }
- }
- }
- void play_beep(beep_parms_t parms) {
- int i; /* loop counter */
- /* try to snag the console */
- if((console_fd = open("/dev/console", O_WRONLY)) == -1) {
- fprintf(stderr, "Could not open /dev/console for writing.\n");
- printf("\a"); /* Output the only beep we can, in an effort to fall back on usefulness */
- perror("open");
- exit(1);
- }
-
- /* Beep */
- for (i = 0; i < parms.reps; i++) { /* start beep */
- if(ioctl(console_fd, KIOCSOUND, (int)(CLOCK_TICK_RATE/parms.freq)) < 0) {
- printf("\a"); /* Output the only beep we can, in an effort to fall back on usefulness */
- perror("ioctl");
- }
- /* Look ma, I'm not ansi C compatible! */
- usleep(1000*parms.length); /* wait... */
- ioctl(console_fd, KIOCSOUND, 0); /* stop beep */
- if(parms.end_delay || (i+1 < parms.reps))
- usleep(1000*parms.delay); /* wait... */
- } /* repeat. */
- close(console_fd);
- }
- int main(int argc, char **argv) {
- char sin[4096], *ptr;
-
- beep_parms_t *parms = (beep_parms_t *)malloc(sizeof(beep_parms_t));
- parms->freq = DEFAULT_FREQ;
- parms->length = DEFAULT_LENGTH;
- parms->reps = DEFAULT_REPS;
- parms->delay = DEFAULT_DELAY;
- parms->end_delay = DEFAULT_END_DELAY;
- parms->stdin_beep = DEFAULT_STDIN_BEEP;
- parms->next = NULL;
- signal(SIGINT, handle_signal);
- parse_command_line(argc, argv, parms);
- /* this outermost while loop handles the possibility that -n/--new has been
- used, i.e. that we have multiple beeps specified. Each iteration will
- play, then free() one parms instance. */
- while(parms) {
- beep_parms_t *next = parms->next;
- if(parms->stdin_beep) {
- /* in this case, beep is probably part of a pipe, in which case POSIX
- says stdin and out should be fuly buffered. This however means very
- laggy performance with beep just twiddling it's thumbs until a buffer
- fills. Thus, kill the buffering. In some situations, this too won't
- be enough, namely if we're in the middle of a long pipe, and the
- processes feeding us stdin are buffered, we'll have to wait for them,
- not much to be done about that. */
- setvbuf(stdin, NULL, _IONBF, 0);
- setvbuf(stdout, NULL, _IONBF, 0);
- while(fgets(sin, 4096, stdin)) {
- if(parms->stdin_beep==CHAR_STDIN_BEEP) {
- for(ptr=sin;*ptr;ptr++) {
- putchar(*ptr);
- fflush(stdout);
- play_beep(*parms);
- }
- } else {
- fputs(sin, stdout);
- play_beep(*parms);
- }
- }
- } else {
- play_beep(*parms);
- }
- /* Junk each parms struct after playing it */
- free(parms);
- parms = next;
- }
- return EXIT_SUCCESS;
- }
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