libs/libc: correct the getrandom(2) prototype

Reference here:
https://man7.org/linux/man-pages/man2/getrandom.2.html

Change-Id: I25b913c4b6533b3888cb2b9c62bb71505a0815c9
Signed-off-by: chao.an <anchao@xiaomi.com>

crypto/random_pool.c

@@ -555,13 +555,15 @@ void up_randompool_initialize(void)
  * Input Parameters:
  *   bytes  - Buffer for returned random bytes
  *   nbytes - Number of bytes requested.
+ *   flags  - Bit mask that can contain zero or more of the ORed values
+ *            together.
  *
  * Returned Value:
  *   None
  *
  ****************************************************************************/
 
-void getrandom(FAR void *bytes, size_t nbytes)
+void getrandom(FAR void *bytes, size_t nbytes, unsigned int flags)
 {
   int ret;
 

drivers/crypto/dev_urandom.c

@@ -165,7 +165,7 @@ static ssize_t devurand_read(FAR struct file *filep, FAR char *buffer,
 #ifdef CONFIG_DEV_URANDOM_RANDOM_POOL
   if (len > 0)
     {
-      getrandom(buffer, len);
+      getrandom(buffer, len, 0);
     }
 
 #else

include/sys/random.h

@@ -64,13 +64,15 @@
  * Input Parameters:
  *   bytes  - Buffer for returned random bytes
  *   nbytes - Number of bytes requested.
+ *   flags  - Bit mask that can contain zero or more of the ORed values
+ *            together.
  *
  * Returned Value:
  *   None
  *
  ****************************************************************************/
 
-void getrandom(FAR void *bytes, size_t nbytes);
+void getrandom(FAR void *bytes, size_t nbytes, unsigned int flags);
 
 #endif /* CONFIG_CRYPTO_RANDOM_POOL */
 

include/sys/syscall_lookup.h

@@ -382,5 +382,5 @@ SYSCALL_LOOKUP(telldir,                    1)
  */
 
 #ifdef CONFIG_CRYPTO_RANDOM_POOL
-  SYSCALL_LOOKUP(getrandom,                2)
+  SYSCALL_LOOKUP(getrandom,                3)
 #endif

libs/libc/uuid/lib_uuid_create.c

@@ -44,7 +44,7 @@
 void uuid_create(uuid_t *u, uint32_t *status)
 {
 #ifdef CONFIG_CRYPTO_RANDOM_POOL
-  getrandom(u, sizeof(uuid_t));
+  getrandom(u, sizeof(uuid_t), 0);
 #else
   unsigned long *beg = (unsigned long *)u;
   unsigned long *end = (unsigned long *)(u + 1);

syscall/syscall.csv

@@ -35,7 +35,7 @@
 "getitimer","sys/time.h","!defined(CONFIG_DISABLE_POSIX_TIMERS)","int","int","FAR struct itimerval *"
 "getpeername","sys/socket.h","defined(CONFIG_NET)","int","int","FAR struct sockaddr *","FAR socklen_t *"
 "getpid","unistd.h","","pid_t"
-"getrandom","sys/random.h","defined(CONFIG_CRYPTO_RANDOM_POOL)","void","FAR void *","size_t"
+"getrandom","sys/random.h","defined(CONFIG_CRYPTO_RANDOM_POOL)","void","FAR void *","size_t","unsigned int"
 "getsockname","sys/socket.h","defined(CONFIG_NET)","int","int","FAR struct sockaddr *","FAR socklen_t *"
 "getsockopt","sys/socket.h","defined(CONFIG_NET)","int","int","int","int","FAR void *","FAR socklen_t *"
 "getuid","unistd.h","defined(CONFIG_SCHED_USER_IDENTITY)","uid_t"