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tools: iio: iio_generic_buffer: allow continuous looping

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Sometimes it's useful to stream samples forever, such as when
stress-testing a driver overnight to check for memory leaks or other
issues. When the program receives a signal, it will gracefully cleanup,
so it is still safe to terminate at any time.

Add support for specifying a negative -c option, meaning that we should
loop forever. To do so, we need to use a long long (instead of just
long) for num_loops so that current code specifying num_loops greater
than UNSIGNED_LONG_MAX doesn't break.

Signed-off-by: Martin Kelly <mkelly@xevo.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Martin Kelly 2018-05-17 17:14:46 -07:00 committed by Jonathan Cameron
parent 71b52d2c74
commit 55dda0abcf
1 changed files with 5 additions and 5 deletions
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10
tools/iio/iio_generic_buffer.c
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@ -248,7 +248,7 @@ void print_usage(void)
"Capture, convert and output data from IIO device buffer\n" "Capture, convert and output data from IIO device buffer\n"
" -a Auto-activate all available channels\n" " -a Auto-activate all available channels\n"
" -A Force-activate ALL channels\n" " -A Force-activate ALL channels\n"
" -c <n> Do n conversions\n" " -c <n> Do n conversions, or loop forever if n < 0\n"
" -e Disable wait for event (new data)\n" " -e Disable wait for event (new data)\n"
" -g Use trigger-less mode\n" " -g Use trigger-less mode\n"
" -l <n> Set buffer length to n samples\n" " -l <n> Set buffer length to n samples\n"
@ -330,12 +330,12 @@ static const struct option longopts[] = {
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
unsigned long num_loops = 2; unsigned long long num_loops = 2;
unsigned long timedelay = 1000000; unsigned long timedelay = 1000000;
unsigned long buf_len = 128; unsigned long buf_len = 128;
ssize_t i; ssize_t i;
unsigned long j; unsigned long long j;
unsigned long toread; unsigned long toread;
int ret, c; int ret, c;
int fp = -1; int fp = -1;
@ -369,7 +369,7 @@ int main(int argc, char **argv)
break; break;
case 'c': case 'c':
errno = 0; errno = 0;
num_loops = strtoul(optarg, &dummy, 10); num_loops = strtoll(optarg, &dummy, 10);
if (errno) { if (errno) {
ret = -errno; ret = -errno;
goto error; goto error;
@ -637,7 +637,7 @@ int main(int argc, char **argv)
goto error; goto error;
} }
for (j = 0; j < num_loops; j++) { for (j = 0; j < num_loops || num_loops < 0; j++) {
if (!noevents) { if (!noevents) {
struct pollfd pfd = { struct pollfd pfd = {
.fd = fp, .fd = fp,