RTEMS: Add missing functions to crt0

This helps to get some more features from libstdc++.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

newlib/libc/sys/rtems/crt0.c

@@ -10,12 +10,13 @@
  *  but this is enough to satisfy the autoconf macro AC_PROG_CC.
  */
 
+#include <sys/lock.h>
+#include <sys/stat.h>
+#include <sys/uio.h>
 #include <reent.h>
-
-#include <signal.h> /* sigset_t */
-#include <time.h> /* struct timespec */
-#include <unistd.h> /* isatty */
-#include <sys/lock.h> /* _Mutex_recursive_Control */
+#include <signal.h>
+#include <time.h>
+#include <unistd.h>
 #include <machine/_arc4random.h>
 #include <machine/_libatomic.h>
 
@@ -97,6 +98,7 @@ RTEMS_STUB(int, access(const char *pathname, int mode), { return -1; })
 RTEMS_STUB(int, clock_gettime(clockid_t clk_id, struct timespec *tp), { return -1; })
 RTEMS_STUB(int, close (int fd), { return -1; })
 RTEMS_STUB(int, dup2(int oldfd, int newfd), { return -1; })
+RTEMS_STUB(int, fchmod(int fd, mode_t mode ), { return -1; })
 RTEMS_STUB(int, fcntl( int fd, int cmd, ... /* arg */ ), { return -1; })
 RTEMS_STUB(pid_t, fork(void), { return -1; })
 RTEMS_STUB(int, fstat(int fd, struct stat *buf), { return -1; })
@@ -113,10 +115,12 @@ RTEMS_STUB(int, lstat(const char *path, struct stat *buf), { return -1; })
 RTEMS_STUB(int, open(const char *pathname, int flags, int mode), { return -1; })
 RTEMS_STUB(int, pipe(int pipefd[2]), { return -1; })
 RTEMS_STUB(_ssize_t, read(int fd, void *buf, size_t count), { return -1; })
+RTEMS_STUB(ssize_t, readv (int fd, const struct iovec *iov, int iovcnt), { return -1; })
 RTEMS_STUB(int, sched_yield(void), { return -1; })
 RTEMS_STUB(int, sigfillset(sigset_t *set), { return -1; })
 RTEMS_STUB(int, sigprocmask(int how, const sigset_t *set, sigset_t *oldset), { return -1; })
 RTEMS_STUB(int, stat(const char *path, struct stat *buf), { return -1; })
+RTEMS_STUB(long, sysconf(int name), { return -1; })
 RTEMS_STUB(int, unlink(const char *pathname), { return -1; })
 RTEMS_STUB(pid_t, vfork(void), { return -1; })
 #if !defined(_NO_POPEN) && !defined(_NO_WORDEXP)
@@ -124,6 +128,7 @@ RTEMS_STUB(pid_t, vfork(void), { return -1; })
 RTEMS_STUB(int, waitpid (pid_t pid, int *status, int options), { return -1; })
 #endif
 RTEMS_STUB(_ssize_t, write (int fd, const void *buf, size_t nbytes), { return -1; })
+RTEMS_STUB(ssize_t, writev (int fd, const struct iovec *iov, int iovcnt), { return -1; })
 
 /* stubs for functions from reent.h */
 RTEMS_STUB(int, _close_r (struct _reent *r, int fd), { return -1; })