openpilot is an open source driver assistance system. openpilot performs the functions of Automated Lane Centering and Adaptive Cruise Control for over 200 supported car makes and models.

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#include "selfdrive/common/params.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const char* const kUsage = "%s: read|write|read_block params_path key [value]\n";
int main(int argc, const char* argv[]) {
if (argc < 4) {
printf(kUsage, argv[0]);
return 0;
}
const char* params_path = argv[2];
const char* key = argv[3];
if (strcmp(argv[1], "read") == 0) {
char* value;
size_t value_size;
int result = read_db_value(params_path, key, &value, &value_size);
if (result >= 0) {
fprintf(stdout, "Read %zu bytes: ", value_size);
fwrite(value, 1, value_size, stdout);
fprintf(stdout, "\n");
free(value);
} else {
fprintf(stderr, "Error reading: %d\n", result);
return -1;
}
} else if (strcmp(argv[1], "write") == 0) {
if (argc < 5) {
fprintf(stderr, "Error: write value required\n");
return 1;
}
const char* value = argv[4];
const size_t value_size = strlen(value);
int result = write_db_value(params_path, key, value, value_size);
if (result >= 0) {
fprintf(stdout, "Wrote %s to %s\n", value, key);
} else {
fprintf(stderr, "Error writing: %d\n", result);
return -1;
}
} else if (strcmp(argv[1], "read_block") == 0) {
char* value;
size_t value_size;
read_db_value_blocking(params_path, key, &value, &value_size);
fprintf(stdout, "Read %zu bytes: ", value_size);
fwrite(value, 1, value_size, stdout);
fprintf(stdout, "\n");
free(value);
} else {
printf(kUsage, argv[0]);
return 1;
}
return 0;
}
// BUILD:
// $ gcc -I$HOME/one selfdrive/common/test_params.c selfdrive/common/params.c selfdrive/common/util.c -o ./test_params
// $ seq 0 100000 | xargs -P20 -I{} ./test_params write /data/params DongleId {} && sleep 0.1 &
// $ while ./test_params read /data/params DongleId; do sleep 0.05; done