sched/group and syscall/: Implement 'real' setuid, getuid, setgid, and getgid interfaces. These will be inheritance by all child task groups.

syscall/syscall.csv

@@ -32,11 +32,13 @@
 "get_errno","errno.h","!defined(__DIRECT_ERRNO_ACCESS)","int"
 "get_errno_ptr","errno.h","defined(__DIRECT_ERRNO_ACCESS)","FAR int*"
 "getenv","stdlib.h","!defined(CONFIG_DISABLE_ENVIRON)","FAR char*","FAR const char*"
+"getgid","unistd.h","defined(CONFIG_SCHED_USER_IDENTITY)","gid_t"
 "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"
 "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"
 "if_indextoname","net/if.h","defined(CONFIG_NETDEV_IFINDEX)","FAR char *","unsigned int","FAR char *"
 "if_nametoindex","net/if.h","defined(CONFIG_NETDEV_IFINDEX)","unsigned int","FAR const char *"
 "insmod","nuttx/module.h","defined(CONFIG_MODULE)","FAR void *","FAR const char *","FAR const char *"
@@ -141,8 +143,10 @@
 "sendto","sys/socket.h","defined(CONFIG_NET)","ssize_t","int","FAR const void*","size_t","int","FAR const struct sockaddr*","socklen_t"
 "set_errno","errno.h","!defined(__DIRECT_ERRNO_ACCESS)","void","int"
 "setenv","stdlib.h","!defined(CONFIG_DISABLE_ENVIRON)","int","FAR const char*","FAR const char*","int"
+"setgid","unistd.h","defined(CONFIG_SCHED_USER_IDENTITY)","int","gid_t"
 "sethostname","unistd.h","defined(CONFIG_LIBC_NETDB)","int","FAR const char*","size_t"
 "setsockopt","sys/socket.h","defined(CONFIG_NET)","int","int","int","int","FAR const void*","socklen_t"
+"setuid","unistd.h","defined(CONFIG_SCHED_USER_IDENTITY)","int","uid_t"
 "shmat", "sys/shm.h", "defined(CONFIG_MM_SHM)", "FAR void *", "int", "FAR const void *", "int"
 "shmctl", "sys/shm.h", "defined(CONFIG_MM_SHM)", "int", "int", "int", "FAR struct shmid_ds *"
 "shmdt", "sys/shm.h", "defined(CONFIG_MM_SHM)", "int", "FAR const void *"

syscall/syscall_lookup.h

@@ -59,6 +59,15 @@ SYSCALL_LOOKUP(sched_yield,                0, STUB_sched_yield)
 SYSCALL_LOOKUP(set_errno,                  1, STUB_set_errno)
 SYSCALL_LOOKUP(uname,                      1, STUB_uname)
 
+/* User identity */
+
+#ifdef CONFIG_SCHED_USER_IDENTITY
+SYSCALL_LOOKUP(setuid,                     1, STUB_setuid)
+SYSCALL_LOOKUP(getuid,                     0, STUB_getuid)
+SYSCALL_LOOKUP(setgid,                     1, STUB_setgid)
+SYSCALL_LOOKUP(getgid,                     0, STUB_getgid)
+#endif
+
 /* Semaphores */
 
 SYSCALL_LOOKUP(sem_destroy,                1, STUB_sem_destroy)

syscall/syscall_stublookup.c

@@ -78,6 +78,13 @@ uintptr_t STUB_sched_yield(int nbr);
 uintptr_t STUB_set_errno(int nbr, uintptr_t parm1);
 uintptr_t STUB_uname(int nbr, uintptr_t parm1);
 
+/* User identity */
+
+uintptr_t STUB_setuid(int nbr, uintptr_t parm1);
+uintptr_t STUB_getuid(int nbr);
+uintptr_t STUB_setgid(int nbr, uintptr_t parm1);
+uintptr_t STUB_getgid(int nbr);
+
 /* Semaphores */
 
 uintptr_t STUB_sem_close(int nbr, uintptr_t parm1);