The lack of random_r in musl: [snip] |main.c:1393:7: warning: implicit declaration of function 'random_r'; did you mean 'random'? [-Wimplicit-function-declaration] | rv = random_r(&rand_data, &val); | ^~~~~~~~ | random |main.c:1408:30: error: invalid application of 'sizeof' to incomplete type 'struct random_data' | memset(&rand_data, 0, sizeof(rand_data)); [snip] s/random_r/random/, s/initstate_r/initstate/ and remove `static struct random_data rand_data' Here is the man of `random_r()': [snip] The random_r() function is like random(3), except that instead of using state information maintained in a global variable [snip] So use random without state information is OK. Signed-off-by: Hongxu Jia <hongxu.jia(a)windriver.com&gt; --- src/main.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/src/main.c b/src/main.c index f60b4d3..602c400 100644 --- a/src/main.c +++ b/src/main.c @@ -84,7 +84,6 @@ static char command[COMMAND_MAX]; static int cmd_argc; static char **cmd_argv; static struct thread_pool pool; -static struct random_data rand_data; static char rand_state[32]; static pthread_mutex_t rand_mutex = PTHREAD_MUTEX_INITIALIZER; static const char *run_dir = NULL; @@ -1386,16 +1385,15 @@ int get_rand(int a, int b); int get_rand(int a, int b) { - int32_t val; - int rv; + long int rv; pthread_mutex_lock(&rand_mutex); - rv = random_r(&rand_data, &val); + rv = random(); pthread_mutex_unlock(&rand_mutex); if (rv < 0) return rv; - return a + (int) (((float)(b - a + 1)) * val / (RAND_MAX+1.0)); + return a + (int) (((float)(b - a + 1)) * rv / (RAND_MAX+1.0)); } static void setup_host_name(void) @@ -1405,9 +1403,7 @@ static void setup_host_name(void) uuid_t uu; memset(rand_state, 0, sizeof(rand_state)); - memset(&rand_data, 0, sizeof(rand_data)); - - initstate_r(time(NULL), rand_state, sizeof(rand_state), &rand_data); + initstate(time(NULL), rand_state, sizeof(rand_state)); /* use host name from command line */ -- 2.8.1