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alsactl: split event loop code to a function

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In a mode of 'monitor', an event loop runs.

This commit applies a small refactoring to splits the loop into a
function for readability.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Takashi Sakamoto 2018-10-14 23:36:26 +09:00 committed by Jaroslav Kysela
parent 71558a41b0
commit 0ef92b4ee7
1 changed files with 30 additions and 21 deletions
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51
alsactl/monitor.c
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@ -84,6 +84,35 @@ static int print_event(int card, snd_ctl_t *ctl)
return 0;
}
static int run_dispatcher(snd_ctl_t **ctls, int ncards, int show_cards)
{
int err = 0;
for (;ncards > 0;) {
struct pollfd fds[ncards];
int i;
for (i = 0; i < ncards; i++)
snd_ctl_poll_descriptors(ctls[i], &fds[i], 1);
err = poll(fds, ncards, -1);
if (err <= 0) {
err = 0;
break;
}
for (i = 0; i < ncards; i++) {
unsigned short revents;
snd_ctl_poll_descriptors_revents(ctls[i], &fds[i], 1,
&revents);
if (revents & POLLIN)
print_event(show_cards ? i : -1, ctls[i]);
}
}
return err;
}
#define MAX_CARDS 256
int monitor(const char *name)
@ -117,27 +146,7 @@ int monitor(const char *name)
show_cards = 0;
}
for (;ncards > 0;) {
struct pollfd fds[ncards];
for (i = 0; i < ncards; i++)
snd_ctl_poll_descriptors(ctls[i], &fds[i], 1);
err = poll(fds, ncards, -1);
if (err <= 0) {
err = 0;
break;
}
for (i = 0; i < ncards; i++) {
unsigned short revents;
snd_ctl_poll_descriptors_revents(ctls[i], &fds[i], 1,
&revents);
if (revents & POLLIN)
print_event(show_cards ? i : -1, ctls[i]);
}
}
err = run_dispatcher(ctls, ncards, show_cards);
error:
for (i = 0; i < ncards; i++)
snd_ctl_close(ctls[i]);