一个声音的程序
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- #include <fcntl.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>
-
- #define DEFAULT_FREQ 10000/* 设定一个合适的频率 */
- #define DEFAULT_LENGTH 1000 /* 200 微秒,发声的长度是以微秒为单位的*/
- #define DEFAULT_REPS 5 /* 默认不重复发声 */
- #define DEFAULT_DELAY 500 /* 同样以微秒为单位*/
-
- typedef struct
- {
- int freq;
- int length;
- int reps;
- int delay;
- } beep_parms_t;
-
- void usage_bail ( const char *executable_name )
- {
- printf ( "Usage: /n /t%s [-f frequency] [-l length] [-r reps] [-d delay] /n ", executable_name );
- exit(1);
- }
-
- void parse_command_line(char **argv, beep_parms_t *result)
- {
- char *arg0 = *(argv++);
- while ( *argv )
- {
- if ( !strcmp( *argv,"-f" ))
- {
- int freq = atoi ( *( ++argv ) );
- if ( ( freq <= 0 ) || ( freq > 10000 ) )
- {
- fprintf ( stderr, "Bad parameter: frequency must be from 1..10000/n" );
- exit (1) ;
- }
- else {
- result->freq = freq; argv++;
- }
- }
- else if ( ! strcmp ( *argv, "-l" ) )
- {
- int length = atoi ( *(++argv ) );
- if (length < 0)
- {
- fprintf(stderr, "Bad parameter: length must be >= 0/n");
- exit(1);
- }
- else {
- result->length = length; argv++;
- }
- }
- else if (!strcmp(*argv, "-r"))
- {
- int reps = atoi(*(++argv));
- if (reps < 0)
- {
- fprintf(stderr, "Bad parameter: reps must be >= 0/n");
- exit(1);
- } else
- {
- result->reps = reps; argv++;
- }
- }
- else if (!strcmp(*argv, "-d"))
- {
- int delay = atoi(*(++argv));
- if (delay < 0)
- {
- fprintf(stderr, "Bad parameter: delay must be >= 0/n");
- exit(1);
- } else {
- result->delay = delay; argv++;
- }
- } else {
- fprintf(stderr, "Bad parameter: %s/n", *argv);
- usage_bail(arg0);
- }
- }
- }
- int main(int argc, char **argv)
- {
- int console_fd; int i;
- beep_parms_t parms = {DEFAULT_FREQ, DEFAULT_LENGTH, DEFAULT_REPS, DEFAULT_DELAY};
-
- parse_command_line(argv, &parms);
-
- if ( ( console_fd = open ( "/dev/dsp", O_WRONLY ) ) == -1 )
- {
- fprintf(stderr, "Failed to open console./n");
- perror("open");
- exit(1);
- }
-
- for (i = 0; i < parms.reps; i++)
- {
- int magical_fairy_number = 1190000/parms.freq;
- ioctl(console_fd, KIOCSOUND, magical_fairy_number);
-
- usleep(1000*parms.length);
- ioctl(console_fd, KIOCSOUND, 0);
-
- usleep(1000*parms.delay);
- }
- return EXIT_SUCCESS;
- }