| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173 | #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 440 /* 設定一個合適的頻率 */#define DEFAULT_LENGTH 200 /* 200 微秒,發(fā)聲的長度是以微秒為單位的*/#define DEFAULT_REPS 1 /* 默認不重復發(fā)聲 */#define DEFAULT_DELAY 100 /* 同樣以微秒為單位*/ 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/console", 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; } |