| 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; } |