added several system call hooks for future sockets implementation

sysdeps/nacl/irt_syscalls.c

 #include <string.h>
 #include <sys/stat.h>
 #include <time.h>
 #include <nacl_stat.h>
 #include <nacl_syscalls.h>
 #define stat nacl_abi_stat
 #include <irt.h>
 #undef stat
 #include <irt_syscalls.h>
 #ifdef IS_IN_rtld
@@ skipping 288 matching lines @@
 int (*__nacl_irt_read) (int fd, void *buf, size_t count, size_t *nread);
 int (*__nacl_irt_write) (int fd, const void *buf, size_t count, size_t *nwrote);
 int (*__nacl_irt_seek) (int fd, off_t offset, int whence, off_t *new_offset);
 int (*__nacl_irt_dup) (int fd, int *newfd);
 int (*__nacl_irt_dup2) (int fd, int newfd);
 int (*__nacl_irt_fstat) (int fd, struct nacl_abi_stat *);
 int (*__nacl_irt_stat) (const char *pathname, struct nacl_abi_stat *);
 int (*__nacl_irt_getdents) (int fd, struct dirent *, size_t count,
                             size_t *nread);
 
+int (*__nacl_irt_epoll_create) (int flags); // size
+int (*__nacl_irt_epoll_create1 )(int flags);
+int (*__nacl_irt_epoll_ctl) (int epfd, int op, int fd, struct epoll_event *event);
+int (*__nacl_irt_epoll_pwait) (int epfd, struct epoll_event *events,
+                                 int maxevents, int timeout,
+                                 const sigset_t *sigmask, size_t sigsetsize);
+int (*__nacl_irt_epoll_wait) (int epfd, struct epoll_event *events,
+                                int maxevents, int timeout);
+int (*__nacl_irt_poll) (struct pollfd *fds, nfds_t nfds,
+                          int timeout);
+int (*__nacl_irt_ppoll) (struct pollfd *fds, nfds_t nfds,
+                           const struct timespec *timeout,
+                           const sigset_t *sigmask, size_t sigsetsize);
+int (*__nacl_irt_socket) (int domain, int type, int protocol);
+int (*__nacl_irt_accept) (int sockfd, struct sockaddr *addr, socklen_t *addrlen);
+int (*__nacl_irt_bind) (int sockfd, struct sockaddr *addr, socklen_t addrlen);
+int (*__nacl_irt_listen) (int sockfd, int backlog);
+int (*__nacl_irt_connect) (int sockfd, struct sockaddr *addr, socklen_t *addrlen);
+int (*__nacl_irt_send) (int sockfd, const void *buf, size_t len, int flags);
+int (*__nacl_irt_sendto) (int sockfd, const void *buf, size_t len, int flags,
+                          const struct sockaddr *dest_addr, socklen_t addrlen);
+int (*__nacl_irt_recv) (int sockfd, void *buf, size_t len, int flags);
+int (*__nacl_irt_recvfrom) (int sockfd, void *buf, size_t len, int flags,
+                                 struct sockaddr *dest_addr, socklen_t addrlen);
+
+int (*__nacl_irt_select) (int nfds, fd_set *readfds,
+                                fd_set *writefds, fd_set *exceptfds,
+                                const struct timeval *timeout);
+int (*__nacl_irt_pselect) (int nfds, fd_set *readfds,
+                                fd_set *writefds, fd_set *exceptfds,
+                                const struct timeval *timeout, void* sigmask);
+
 int (*__nacl_irt_sysbrk) (void **newbrk);
 int (*__nacl_irt_mmap) (void **addr, size_t len, int prot, int flags,
                         int fd, off_t off);
 int (*__nacl_irt_munmap) (void *addr, size_t len);
 
 int (*__nacl_irt_dyncode_create) (void *dest, const void *src, size_t size);
 int (*__nacl_irt_dyncode_modify) (void *dest, const void *src, size_t size);
 int (*__nacl_irt_dyncode_delete) (void *dest, size_t size);
 
 int (*__nacl_irt_thread_create) (void *start_user_address, void *stack,
@@ skipping 233 matching lines @@
       __nacl_irt_clock_gettime = nacl_irt_clock_gettime;
     }
 
   if (!__nacl_irt_query)
     __nacl_irt_query = no_interface;
 
   __nacl_irt_mkdir = not_implemented;
   __nacl_irt_chdir = not_implemented;
   __nacl_irt_rmdir = not_implemented;
   __nacl_irt_getcwd = not_implemented;
+
+  __nacl_irt_epoll_create = not_implemented;
+  __nacl_irt_epoll_create1 = not_implemented;
+  __nacl_irt_epoll_ctl = not_implemented;
+  __nacl_irt_epoll_pwait = not_implemented;
+  __nacl_irt_epoll_wait = not_implemented;
+  __nacl_irt_poll = not_implemented;
+  __nacl_irt_ppoll = not_implemented;
+  __nacl_irt_socket = not_implemented;
+  __nacl_irt_accept = not_implemented;
+  __nacl_irt_bind = not_implemented;
+  __nacl_irt_listen = not_implemented;
+  __nacl_irt_connect = not_implemented;
+  __nacl_irt_send = not_implemented;
+  __nacl_irt_sendto = not_implemented;
+  __nacl_irt_recv = not_implemented;
+  __nacl_irt_recvfrom = not_implemented;
+  __nacl_irt_select = not_implemented;
+  __nacl_irt_pselect = not_implemented;
 }
 
 size_t nacl_interface_query(const char *interface_ident,
                             void *table, size_t tablesize) {
   return (*__nacl_irt_query)(interface_ident, table, tablesize);
 }