| 1 | |
| 2 | |
| 3 | * This tool is used by the utimer test, and it allows us to
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| 4 | * count the ticks of a global timer in a certain time frame
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| 5 | * (which is set by `timeout` parameter).
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| 6 | *
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| 7 | * Author: Ivan Orlov <[email protected]>
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| 8 |
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| 9 | #include <stdio.h>
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| 10 | #include <stdlib.h>
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| 11 | #include <alsa/asoundlib.h>
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| 12 | #include <time.h>
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| 13 |
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| 14 | static int ticked;
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| 15 | static void async_callback(snd_async_handler_t *ahandler)
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| 16 | {
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| 17 | ticked++;
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| 18 | }
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| 19 |
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| 20 | static char timer_name[64];
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| 21 | static void bind_to_timer(int device, int subdevice, int timeout)
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| 22 | {
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| 23 | snd_timer_t *handle;
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| 24 | snd_timer_params_t *params;
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| 25 | snd_async_handler_t *ahandler;
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| 26 |
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| 27 | time_t end;
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| 28 |
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| 29 | sprintf(timer_name, "hw:CLASS=%d,SCLASS=%d,DEV=%d,SUBDEV=%d",
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| 30 | SND_TIMER_CLASS_GLOBAL, SND_TIMER_SCLASS_NONE,
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| 31 | device, subdevice);
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| 32 |
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| 33 | snd_timer_params_alloca(¶ms);
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| 34 |
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| 35 | if (snd_timer_open(&handle, timer_name, SND_TIMER_OPEN_NONBLOCK) < 0) {
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| 36 | perror("Can't open the timer");
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| 37 | exit(EXIT_FAILURE);
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| 38 | }
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| 39 |
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| 40 | snd_timer_params_set_auto_start(params, 1);
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| 41 | snd_timer_params_set_ticks(params, 1);
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| 42 | if (snd_timer_params(handle, params) < 0) {
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| 43 | perror("Can't set timer params");
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| 44 | exit(EXIT_FAILURE);
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| 45 | }
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| 46 |
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| 47 | if (snd_async_add_timer_handler(&ahandler, handle, async_callback, NULL) < 0) {
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| 48 | perror("Can't create a handler");
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| 49 | exit(EXIT_FAILURE);
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| 50 | }
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| 51 | end = time(NULL) + timeout;
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| 52 | if (snd_timer_start(handle) < 0) {
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| 53 | perror("Failed to start the timer");
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| 54 | exit(EXIT_FAILURE);
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| 55 | }
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| 56 | printf("Timer has started\n");
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| 57 | while (time(NULL) <= end) {
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| 58 | |
| 59 | * Waiting for the timeout to elapse. Can't use sleep here, as it gets
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| 60 | * constantly interrupted by the signal from the timer (SIGIO)
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| 61 |
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| 62 | }
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| 63 | snd_timer_stop(handle);
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| 64 | snd_timer_close(handle);
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| 65 | }
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| 66 |
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| 67 | int main(int argc, char *argv[])
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| 68 | {
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| 69 | int device, subdevice, timeout;
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| 70 |
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| 71 | if (argc < 4) {
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| 72 | perror("Usage: %s <device> <subdevice> <timeout>");
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| 73 | return EXIT_FAILURE;
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| 74 | }
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| 75 |
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| 76 | setlinebuf(stdout);
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| 77 |
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| 78 | device = atoi(argv[1]);
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| 79 | subdevice = atoi(argv[2]);
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| 80 | timeout = atoi(argv[3]);
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| 81 |
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| 82 | bind_to_timer(device, subdevice, timeout);
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| 83 |
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| 84 | printf("Total ticks count: %d\n", ticked);
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| 85 |
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| 86 | return EXIT_SUCCESS;
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| 87 | }
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